bluuebunny/crossref_metadata_2025 huggingface dataset:
INDUKSI PERKECAMBAHAN PADA BIJI KARET (Hevea brasiliensis Muell) DENGAN SISTEM PERENDAMAN DAN TANPA PERENDAMAN AIR
Authors: Sitanggang Kamsia Dorliana
Published: January 2020

This study aims to see the differences in the speed of sprout growth with immersion systems and without water immersion. The results showed that there were differences percentage of seeds germinated between seeds that were given water immersion for 12 hours (85%) and were not given water immersion (65%). For the other parameter average days of sprouting, where the seeds that are given water immersion are more quickly induced by sprouts as much as 60% age 7 days after seedling, compared not given water immersion can only be induced by 40%. Likewise, the 17th day after the seedlings were induced by 85% for soaking seeds and 65% for seeds that were not soaking. Keywords: Rubber, Sprout, Water immersion
ISOLASI DAN UJI ANTAGONIS MIKROORGANISME LOKAL (MOL) REBUNG BAMBU TERHADAP CENDAWAN Fusarium sp
Authors: Walida Hilwa
Published: January 2020

Efforts to increase the production of chilli plants are still experiencing obstacles. One of the diseases caused by fungi is fusarium wilt disease caused by Fusarium sp. The existence of this fungus attack makes one of the limiting factors that cause a decrease in red chili production. Local microorganism (MOL) solution is a fermented solution made from various local available resources. MOL solution contains micro and macro nutrients and also contains bacteria that have the potential to remodel organic matter, stimulate growth, and as a controlling agent for pests and plant diseases, so that MOL can be used both as a decomposer, biological fertilizer and as an organic pesticide, especially as a fungicide.In this research, bacterial isolation from MOL bamboo shoots will be carried out and then tested the isolates on Fusarium sp. The data of this research were analyzed descriptive. The results of isolation from bamboo shoot MOL which has been fermented for use as POC, obtained 8 bacterial isolates with different macroscopic and microscopic characteristics. All obtained bacterial isolates have the potential to inhibit the growth of fusarium fungal colonies. The most potential bacterial isolate was M6 isolate with a diameter of a pathogenic fungal colony that grew only by 2.1 cm.Keywords: Fusarium sp., Local Microorganisms, Bamboo Shoots
Implementasi Kurikulum 2013 Berbasis Pendekatan Saintifik dalam Pengajaran Bahasa Inggris SMA/SMK Berbasis Teks
Authors: Ambalegin Ambalegin , Suhardianto Suhardianto
Published: January 2020

The implementation of the Curriculum 2013 is noble because it implements attitudes, knowledge, and skills integrated in every subject. The curriculum 2013 uses a scientific approach in each teaching implementation thus the students are taught to prioritize inductive compared to deductive reasoning. English is a core lesson and a skill in SMA/SMK must be taught by teachers who have competence in transferring knowledge, but they are constrained in the application of a scientific approach to text-based English teaching (texbook-based approach). The purpose of this training is to open the horizons of English teachers in applying two approaches in teaching English at SMA/SMK level in the classroom. The method implemented was public education and training with the techniques of lecturing, discussing, and demonstrating. The result of this training was the improvement of the teachers’ capability in teaching English by collaborating the scientific approach and textbook-based approach in the classroom. This training was the importance of developing the potential of students to become human beings who believe and fear God Almighty, have good morality, health, knowledge, capability, creativity, and independence, and be democratic and responsible citizens.
PEMBINAAN KESANTUNAN BERBAHASA BAGI REMAJA PADA LEMBAGA PEMBINAAN KHUSUS ANAK (LPKA) KELAS II DI KOTA BATAM
Authors: Handayani Nurma Dhona , Mubarak Zia Hisni
Published: January 2020

Menghadapi Era Globalisasi yang sarat dengan kompetisi, masyarakat dituntut untuk memiliki bekal sumber daya manusia yang handal. Bersamaan dengan itu, berbagai ragam latar belakang dan keterampilan setiap individu bebas untuk bermain dalam dunia persaingan dan tidak menutup kemungkinan orang-orang luar negeri ikut serta di dalamnya. Jelas ini menjadi perhatian serius yang harus dibenahi mengingat tidak sedikit dari sumber daya manusia di negeri ini yang bisa dikatakan kalah dari negara-negara lain. Salah satu isu yang menjadi pembahasan banyak kalangan adalah bahasa. Bahasa merupakan modal utama untuk dapat berkomunikasi. Ironisnya, permasalahan yang terjadi di masyarakat yaitu penggunaan bahasa dengan tingkat kesantunan yang baik dapat dikatakan masih jauh dari baik. Khususnya kesantunan berbahasa dalam bahasa Inggris. Oleh karena itu, dalam upaya untuk meningkatkan kualitas berbahasa yang baik, maka akan sangat penting bagi masyarakat untuk memahami bentuk-bentuk kesantunan dalam berbahasa khususnya bagi anak-anak remaja yang membutuhkan pembinanan pada lembaga pembinaan khusus anak (LPKA). Dengan kemampuan berbahasa yang baik, khususnya kemampuan dalam menggunakan Bahasa Inggris, hal ini dapat membantu meningkatkan kualitas komunikasi para remaja binaan yang dapat bermanfaat bagi mereka dikemudian hari.

 

Kata Kunci : Pembinaan, Kesantunan Berbahasa, Komunikasi
Polymeric Composites Based on Polyurea Matrix Reinforced with Carbon Nanotubes
Authors: Vulcan Maria Adina , Damian Celina , Stanescu Paul Octavian , Vasile Eugeniu , Petre Razvan , Hubca Gheorghe
Published: January 2020

This paper deals with the synthesis of polyurea and its use as polymer matrix for nanocomposites reinforced with multi-walled carbon nanotubes (MWCNT). Two types of materials were obtained during this research, the first cathegory uses the polyurea as matrix and the second one uses a mixture between epoxy resin and polyurea. The nanocomposites were characterized by Thermogravimetric Analysis (TGA), Dynamic Mechanical Analysis (DMA), Scanning Electron Microscopy (SEM) and Tensile Tests .The elastomeric features of nanocomposites were highlighted by the results which showed low value of Tg. Also higher thermal stability with ~40oC compared with commercial products (M20) were observed, but lower mechanical properties compared to neat polyurea.
Influence of the Fiber Post Material on the Reconstructed Tooth Crown Bending Resistance
Authors: Ionas Mona , Paun Alexandru , Fratila Marcu
Published: January 2020

Post and core build-ups provide resilience and retention for future tooth restorations. In this study we intend to assess the resistance to fracture of two types of aesthetic post, using a testing machine after the application of a paraxial force. The results show that no specific material from the ones used shows a better behavior. Fiber quartz posts AAA Fiber Post had the highest resistance and the fiberglass posts Matrix Plus 2 were rated with the lowest values. Further laboratory and clinical studies are necessary to the in which one type of post material is favorable for a specific type case.
SEM Analysis of Composites with TCP/HA/Chitosan/Poly (Methylmethacrilate)
Authors: Cojocaru Ileana , Prodan Doina , Popescu Violeta , Moldo Marioara
Published: January 2020

Modified cement composites were prepared by dispersing commercially available PMMA powders and chitosan/ tricalcium phosphate (TCP) or chitosan / hydroxyapatite (HA) fillers into a PMMA matrix. SEM and EDX were used to determine the compounds and the morphology of the composite. The characteristics of these materials indicate that the addition of chitosan/TCP and chitosan /HA as a constituent into the PMMA cement significantly decreases the curing peak temperature. Furthermore, the setting time increases from 4 min to 7 min, as compared to the PMMA cement. These changes could be beneficial for the handling of the bone cement paste and causing less damage to the surrounding tissues.
pH Sensitive Polymeric Binders for Energetic Materials
Authors: Voicu Andreea Elena , Rotariu Traian , Teodorescu Mircea , Zecheru Teodora , Tiganescu Tudor Viorel , Orban Octavian
Published: January 2020

The aim of this research has been to develop a new generation of eco-friendly binders, soluble at alkaline pH, which could allow facile recovery of explosive fillers without using organic solvents, while maintaining their chemical and physical characteristics. For this purpose, �smart� polymeric binders are to be designed based on acrylic acid and other acrylic monomers. In this view, theoretical and experimental studies have been performed in order to establish which synthesized polymer is adequate for the desired application.
Biochemical Markers Predicting the Risk of Gestational Diabetes Mellitus
Authors: Schaas Bogdan Andreas , Ivan Sabina , Titianu Monica , Condratovici Catalin Plesa , Maier Adrian , Schaas Carmina Mihaiela
Published: January 2020

Gestational diabetes mellitus (GDM), defined by the occurrence or discovery of glucose intolerance during pregnancy is associated with higher risk of perinatal complications and long-term development of chronic diseases both in the mother and her child. Recent data suggest that women diagnosed earlier in pregnancy, even having more risk factors, develop fewer complications. The aim of the current study is to analyse biochemical markers that play a role in the pathophysiology of GDM and could lead to an early diagnosis. The authors performed a case-control study on 50 pregnant women that finally developed GDM and 50 pregnant women with risk factors for GDM which did non develop the disease. In all cases there were monitored a series of biochemical markers like glycated haemoglobin (HbA1c), sex hormone binding globulin (SHBG), magnesium (Mg), C-reactive protein (CRP), plasma insulin level, and pregnancy-associated plasma protein A (PAPP-A). All these factors were statistically analysed using univariate and multivariate tests in order to evaluate their predicting value. The combination of traditional risk factors with HBA1c, SHBG, PAPP-A and CRP proved significant prognosis value (75% sensitivity rate, 9% false positive rate) for GDM. In conclusion, these four biochemical markers available in early pregnancy have improved the performance of predicting models concerning the development of severe GDM needing insulin treatment and predisposing to maternal and foetal complications.
Clinical and Biochemical Study of Hypoandrogenic Metabolic Syndrome in the Cardiovascular Risk Content of Male Patients
Authors: Grozdan Ana Minodora , Paduraru Oana , Ghiuru Rodica , Georgescu Costinela , Duceac Letitia
Published: January 2020

The aim of this study was to determine the incidence of hypoandrogenenic to male patients with S.Met., in the context of cardiovascular risk factors. It performed description of a correlation with diagnostic components of S.Met., and specifying an interrelated male hypogonadism with each of the major cardiovascular risk factors.
Comparison of Shear Bond Strength and Adhesive Remnant Index of Brackets Bonded with Two Types of Orthodontic Adhesives
Authors: Mahmoud Elsaafin , Pacurar Mariana , Bechir Edwin Sever , Maris Marius , Olteanu Cristian , Dascalu Ionela Teodora , Moldovan Marioara
Published: January 2020

The aim of this study was to evaluate shear bond strength and adhesive remnant index between two different brands of adhesive systems and brackets. The adhesive systems were represented by Opal Bond MV Composite and Opal Seal (Ultradent), respectively the fluoride releasing Transbond light cure adhesive paste and Transbond XT (3M). The utilised brackets were Avex metal bracket system (Ultradent), respectively Unitek Miniature Twin Metal Brackets (3M). The study was realized on 4 groups of extracted teeth: the first and second groups by using the products of the manufacturer Ultradent, respectively 3M, and the third and fourth groups by using the adhesive system of one manufacturer and the brackets of the other manufacturer. The study revealed that the use of adhesive system and brackets of the same manufacturer may increase the shear bond strength and decrease the adhesive remnant index.
Clinical Personality Patterns in Young Adults with HIV Nosocomial Infection from the Region of Southeast Romania
Authors: Modrigan Mirela , Draganescu Miruna , Condratovici Catalin Plesea , Pavel Liliana Lacramioara , Condratovici Alina Plesea
Published: January 2020

The study aim was to determine the characteristics and pervasive features of personality for the patients with nosocomial HIV infection and its influence on the adherence to antiretroviral therapy.The retrospective study was conducted on 123 patients with nosocomial HIV infection; for determining the characteristic and pervasive features of personality it was used MCMI-III test. The adherence to therapy was determined by using a questionnaire developed by the Department for monitoring HIV / AIDS infection of the National Institute of Infectious Diseases. The obtained results were compared with the data for the general population, published by DSM IV.28.5% of patients had disorders of personality traits, being significantly affected males rather than females (p = 0.0388). The most common personality disorder trait was the addiction. The compulsive type disorders (9.75%), avoidant, and histrionic (7.3% each) and narcissistic (4.9%) exceeded the prevalence recorded for the general population. Patients with disorders of personality traits had significantly reduced adherence to antiretroviral therapy (p = 0.0045).The patients with HIV nosocomial infection had those disorders of personality traits associated with the stigma and social rejection: dependence, avoidance, compulsiveness, and they influenced the attitudes towards therapy expressed by low adherence.
Finite Element Analysis of the Multilayered Honeycomb Composite Material Subjected to Impact Loading
Authors: Cormos Raul , Petrescu Horia , Hadar Anton , Adir Gorge Mihail , Gheorghiu Horia
Published: January 2020

The main purpose of this paper is the study the behavior of four multilayered composite material configurations subjected to different levels of low velocity impacts, in the linear elastc domain of the materials, using experimental testing and finite element simulation. The experimental results obtained after testing, are used to validate the finite element models of the four composite multilayered honeycomb structures, which makes possible the study, using only the finite element method, of these composite materials for a give application.
Biocomposites Based on Biogenous Mineral for Inducing Biomimetic Mineralization
Authors: Dragusin Diana Maria , Curti Filis , Cecoltan Sergiu , Sarghiuta Daniela , Butac Livia Maria , Vasile Eugeniu , Marinescu Rodica , Stancu Izabela Cristina
Published: January 2020

In this work, we focused on the potential of biogenous mineral from Cuttlefish bone for inducing biomimetic mineralization with further biomedical applications. We demonstrate the formation of strong and flexible hydrogels via physical immobilization of cuttlefish bone powder in the presence of bovine gelatin and alginate. The properties of hydrogels loaded with biogenous mineral, with a commercial bone substitute, with commercial nano-hydroxyapatite and in situ generated hydroxyapatite. In vitro cell adhesion tests demonstrated that the new developed hydrogels showed a promising cell adhesion.
Main Characteristics for Materials Used as Synthetic Surgical Meshes
Authors: Vasile Danut , Iancu George , Iancu Raluca Claudia , Davitoiu Dragos Virgil
Published: January 2020

Synthetic meshes are steadily developed and optimized to provide the best biocompatibility, resistance and elasticity with minimal side effects when used in vivo. This article presents mesh parameters, which influence the biological outcomes in surgical cases. Material, structure, resistance to the applied force, elasticity and biocompatibility are listed below in order to clarify the advantages and shortcomings of different mesh types. Future developments in synthetic mesh industry are presented as well in order to improve mesh acceptability in vivo and optimize healing process. There is no ideal mesh, but only prostheses with fewer side effects when correctly used, in accordance with patient needs.
Oxidative Stress Following PLGA Nanoparticles Administration to an Animal Model
Authors: Miricescu Daniela , Stanescu Iulia , Perlea Paula , Calenic Bogdan , Radulescu Radu , Totan Alexandra , Virgolici Bogdana , Sabliov Cristina , Grea Maria
Published: January 2020

In the recent years, engineered nanoparticles (NPs) such as PLGA or poly-lactic-co-glycolic acid, have raised a substantial interest due to their possible medical applications in vaccination, diagnostic imaging procedures, cancer therapy or sustained delivery of drugs. The main aim of the present work is to evaluate key oxidative stress parameters in several organs following NPs administration in an animal model. Our data shows that acute oral administration of PLGA NPs induces a change in the antioxidant status in both rat liver and spleen, but may not induce oxidative stress damage to cell structures such as lipid or protein oxidation.
Depth Profiling of Diffraction-based Security Features in Authentic and Counterfeit Banknotes
Authors: Negru Ioan Cristinel , Vasilache Viorica , Sandu Ion , Olariu Romeo Iulian , Tanasa Petru Ovidiu , Potolinca Daniel , Sandu Irina Crina Anca
Published: January 2020

High printing quality of banknotes and the variety of security features implemented in banknotes make a big difference between the genuine notes and high-quality forgeries. The counterfeiter cannot reproduce or imitate the printing quality and all security features embedded in every banknote, such as Optically Variable Ink, Optically Variable Diffractive Images, or intaglio printing. The present research focused on the examination of optically variable devices embedded on 50Îbanknotes. The altered banknotes were examined using different techniques.
Synthesis and Characterization of Some Ester-type Biolubricants of Soiabean Fatty Acids
Authors: Boran Sorina , Nitu Sabina
Published: January 2020

Growing demands from industry for the use of eco-friendly lubricants led research towards finding environmentally friendly products with superior lubricating characteristics. Vegetable oils and synthetic ester oils are competitive base oils used to obtain lubricants with good physico-chemical, rheological and tribotechnical properties, biodegradable lubricants without negative environmental impacts. In this study we aimed the synthesis and characterization of bioesters with lubricant properties, using as acid component the soybean oil fatty acids in conjunction with the following hydroxyl compounds n-buthanol (P1) and 1,2-propilenglycole (P2), respectively. These complex esters were synthesized in a microwave reactor in a single stage in the presence of the catalyst at the reflux temperature. Characterization was carried out in the respective of structural point of view and as a lubricant.
Experimental Characterisation of the Mechanical Properties of Lightweight 3D Printed Polymer Materials for Biomechanical Application in Ankle-Foot Orthosis
Authors: Pahonie Radu Calin , Stefan Amado , Adochiei Ioana Raluca , Costuleanu Carmen Luiza , Andruseac Gabriela Gladiola , Ungureanu George , Sardaru Dragos Petrica
Published: January 2020

In lumbar disc herniation a possible functional problem in the ambulation is the Foot-drop syndrome caused by radicular nerve pinching. This causes a dramatic loss in gait cycle efficiency. In the rehabilitation process patients may benefit from wearing a foot orthosis that prevents them from falling and secondary injuries. Evidence in the literature suggests the important correlation between the optimal match of the forces produced during human gait and the rigidity of the constructive materials. The inherent rigidity of the materials plays an important role in determining its biomechanical functions. The paper proposes an experimental and numerical characterization of 3D printed ABS and PLA specimens using a universal traction-compression testing machine and a finite element method numerical simulation.
The Prospects of Using Meshes in Imediate Implant - Based Breast Reconstructions
Authors: Filip Cristina Iulia , Berbece Sorin , Raducu Laura , Florescu Ioan Petre , Ardeleanu Valeriu , Jecan Cristian Radu
Published: January 2020

Breast reconstruction involves two major conditions: to be oncologically safe and to respect the aesthetic of the reconstructed breast. Moreover, every healthcare system in the world manifests a keen tendency to cut back on medical costs, which influences our surgical techniques and breast reconstruction procedures. The use of biological matrices like the acellular dermal matrix has become an acknowledged alternative in implant-based breast reconstruction, in spite of the many impediments and controversies that surround it. However, these matrices are costly and less attainable as compared to synthetic meshes that are conservative with resources and unyielding to the formation of biofilm bacteria. Accordingly, we decided to research the impact of synthetic meshes in implant-based breast reconstruction.
An Investigation on the Reliability and Degradation of Polycrystalline Silicon Solar Cells Under Accelerated Corrosion Test
Authors: Zaharia Sebastian Marian , Pop Mihai Alin , Chicos Lucia Antoneta , Lancea Camil , Semenescu Augustin , Florea Bogdan , Chivu Oana Roxana
Published: January 2020

Using the reliability accelerated tests in the early stage of solar cells life cycle, by using an high level of stress, in order to highlight the one or more degradation factors, on which could be quickly acquired a series of the experimental data, leads to point out the design errors of solar cells and to predictive assessment of reliability indicators. Environmental factors influence the lifetime of a solar cell. The action of each factors determines its aging and finally its degradation as the result of the combined action of sunlight, emissions, climate change, temperature and humidity, the action of dust, the saturated air from the proximity of oceans and seas, whose actions a solar cell undergoes during normal operation. In this paper has been analysed 10 polycrystalline solar cells subjected to accelerated corrosion tests. It has been also carried out two analyses, the first a quantitative analysis by determining the values of reliability indicators and the second one was a qualitative analysis of the degradation of polycrystalline solar cells using the optical microscope.
Evaluation of Molecularly Imprinted Polymer Pearls for Selective Isolation of Hypericins
Authors: Florea Ana Mihaela , Iordache Tanta Verona , Zaharia Anamaria , Georgescu Bianca , Voicu Andreea Elena , Tsyntsarski Boiko , Hubca Gheorghe , Sarbu Andrei
Published: January 2020

This article describes the evaluation of molecularly imprinted polymers (MIPs) obtained by wet phase inversion for facile separation of hypericins from Hypericum perforatum L. (or Saint John�s Wort, SJW). In this respect, concentrated extracts containing hypericin and pseudohypericin were used as �phyto-templates� for creating selective cavities into the pearl shaped MIPs. The obtained MIPs were characterized by infrared and by thermal analyses. Chromatographic evaluation of the MIPs was performed relative to blank samples and it was concluded that the pearls can retain selectively the hypericins from SJW extracts.
A-mode Ultrasound Analysis of Postoperative Thigh Edema in Patients with Hip Fracture
Authors: Haragus Horia , Prejbeanu Radu , Timar Bogdan , Vermesan Dinu
Published: January 2020

Postoperative edema and lean body mass may contribute to functional outcome in frailty hip fracture patients. Advances in body mass determination have produced consistent results with A-mode ultrasound. We therefore aimed to determine the utility of A-mode ultrasound in analyzing postoperative limb edema in patients receiving treatment for proximal femur fractures. 4 males and 6 females, with an average age of 74.3 years were included. 4 had fractures of the femoral neck treated by hemiarthroplasty and the rest had extracapsular fractures which were stabilized with short intramedullary nails. Measurements were done using a commercially available A-mode 2.5MHz transducer on the thighs approximately 15 cm proximal to the patella. Comparison showed significant difference between the operated and contralateral thigh circumference (P=0.001) as well as muscle layer thickness differences between femoral neck patients and those with fractures of the trochanteric region (P=0.016). There was no correlation between the A-mode ultrasound determined superficial layer difference and entire layer difference (R2=0.037; P=0.59). However, there was linear correlation between the A-mode ultrasound determined entire layer difference and limb circumference difference, (R2=0.414; P=0.044). Postoperative thigh edema is present in all surgically treated patients for proximal femur fractures. A-mode ultrasound might be a reliable tool to examine adipose and muscle layers separately in the immediate postoperative period. There may be a difference in edema distribution between femoral neck and peritrochanteric fractures but larger samples are required.
In vitro Study on the Dimensional Stability of Interocclusal Recording Materials
Authors: Cerghizan Diana , Earar Kamel , Scutariu Mihaela Monica , Dimofte Alina Ramona , Grecu Gina Paunita , Janosi Kinga
Published: January 2020

The teeth are found in the alveolar processes of both the upper and lower jaw and they form the two maxillary and mandibular dental arches, the various relations of which support the performance of the dental apparatus functions, one of the most important of which is mastication. These relations are also known as interocclusal relations, among which the moments in which the dento-dental contacts (occlusal relations) play an important role. Maximum intercuspation (MI) is the most frequent mandibulo-cranial functional position with dento-dental contact. The vast majority of functional food incision and mastication cycles end in MI. The highest number of dento-dental contacts, and the largest possible stability and surface of these contacts are also achieved in MI. Given the relative easiness of determination, recording and transfer of the MI position, it is used in many clinical situations to report the models of the two arches. The interocclusal recording materials used in our study were seven silicones, six of which with addition reaction, five with special destination for interocclusal relation determination and a putty-like silicone normally used for dental arch impression - Elite HD and one condensation silicone used for impressions. The reason for choosing the last two materials was the fact that some practitioners frequently use putty-like impression silicone to determine interocclusal relations. According to the findings of the measurements shown in table 1, further to the initial impression process, at the time T0, satisfactory results were obtained both for addition silicones and for condensation silicones, Registrado X-tra being the only recording material which exhibited major deviation from the standard dimension (3 mm). As for the Optosil condensation silicone, we noted a significant increase of the thickness of the material starting with the first hour after impression and reaching considerable values on the 5th day, which were 0.3 mm higher than the standard value. Rigid addition silicones have the lowest dimensional stability; putty-like silicones are frequently used to record interocclusal relations for fixed prosthetics, which is wrong since they grow rapidly and this impedes on the space between the treated tooth and the opposite tooth, the result being a high restoration, which may determine premature contacts. Except for Optosil, which exhibited a continuous increase, most materials may be used to mount models in the simulator after 24 h.
Caracterizarea reologica a cimenturilor acrilice osoase utilizate in inlocuirea totala a soldului
Authors: Mihailescu Dan , Danu Maricel , Simionescu Bogdana , Botez Paul , Savin Liliana , Ibanescu Sorin Alexandru
Published: January 2020

The paper presents the results of rheological tests for three commercial acrylic bone cements currently used in total hip replacement . Moreover, twelve experimental formulations of acrylic bone cements were realized, by partially replacing the methyl methacrylate (MMA) from the classical liquid monomer phase with a new monomer and their rheological properties were evaluated and compared with the commercial bone cements. Thus, the efficacy of acrylic bone cements as anchoring materials as well as their handling and curing properties were estimated. The new formulations exhibited higher elasticity, lower dynamic moduli and clear shear-thinning behavior proving to be potential replacements for classical acrylic based bone cements.
Evaluation of Adhesive Capacity of Universal Bonding Agents Used in Direct Composite Resins Repair
Authors: Stoleriu Simona , Andrian Sorin , Nica Irina , Sandu Andrei Victor , Pancu Galina , Murariu Alice , Iovan Gianina
Published: January 2020

The aims of the study were to characterise the resin-resin interface when a universal bonding agent (UBA) was used in two different strategies in direct composite repair and to evaluate the bonding capacity of UBA by microleakage assessment. In study groups a micro-filled hybrid and a nano-filled hybrid composite resins were aged in order to simulate an old restorations. As a repair material was chosen the same micro-filled hybrid composite resin that was used as an old restoration. UBA was applied in etch-and-rinse and self-etch strategies and was used as an intermediate layer in repair procedure. After the repair the samples were aged again. In control groups were included non-aged, repaired composite resins samples. The resin-resin interface was characterised on SEM images and the microleakage at the interface was evaluated by dye penetration assessment. Universal bonding agent used in direct composite resins repair showed a very good adaptation to non-aged micro-filled hybrid and nano-filled hybrid composite resins. Aging by saliva storage of repaired composite resins leaded to an enlargement of resin-resin junction and a increased microleakage irrespective of the strategy (etch-and-rinse or self -etch) used for bonding agent application. Etch-and-rinse strategy for universal bonging agent application determined a better interface bonding when compared to self -etch strategy.
Training in Flap Harvesting using Corrosion Casted Pig Latissimus Dorsi Muscle Flaps Choosing the Optimal Plastic Compound for Corrosion Casting
Authors: Nistor Alexandru , Pusztai Agneta Maria , Sora Mircea Constantin , Hoinoiu Bogdan , Ionac Mihai , Matusz Petru
Published: January 2020

Plastic compounds have been used for several decades to generate anatomical constructs for the training of new surgeons and medical students alike. The present study seeks to highlight the advantages and disadvantages of two different plastic compounds (Technovit 7143 and Epoxi BIODURÒE12) used to create corrosion casts of the vascular branching patterns in free muscle flaps. Porcine latissimus dorsi muscle free flaps were used in this study to create corrosion casts of their vascular branching tree by injecting the two different plastic compound into the main arterial supply. The casts generated by Epoxy BIODURÒ E12 have superior qualities compared to the casts injected with Technovit 7143, because the injection process is smoother at all branching levels, without dilation, strictures or intramuscular extravasation of the injectable plastic compound. The corrosion casts resulted from injecting Epoxy BIODURÒ E12 exhibit better elasticity and better resistance to mechanical handling compared to the ones injected with Technovit 7143.
FEA Deformations Analysing of the Polyurethane Armchair Seat
Authors: Butnar Lucian Adrian , Basarman Adrian Paul , Tranisan Daniela Ioana , Groza Ioan
Published: January 2020

In this paper it will be presented the deformations analysis using the finite element analysing method, for an armchair seat redesigned from an wooden original model, into a polyurethane more compact structure. In order to perform the testing required, a 3D PU design was made after the wooden model. This new design was made in such way which will enhance the productivity, to be more compact, more lightweight and also more resistant than the original design.
Comparative Analysis of Two Bioplasticizers Used to Modulate the Properties of PLA Biocomposites
Authors: Rapa Maria , Darie Nita Raluca Nicoleta , Irimia Anamaria , Sivertsvik Morten , Rosnes Jan Thomas , Trifoi Ancuta Roxana , Vasile Cornelia , Tanase Elisabeta Elena , Gherman Timea , Popa Mona Elena , Mitelut Amalia Carmen
Published: January 2020

The present paper deals with a comparative study on the influence of two different bioplasticizers: acetyl tributylcitrate (ATBC) and LAPOL108 on the mechanical and antimicrobial properties of poly(lactic acid) PLA containing 1 wt.% chitosan. PLA based biocomposites were investigated by means of processing behavior, FT-IR spectroscopy, DSC analysis, tensile and barrier properties, migration in food simulants and antifungal activity. Based on the obtained results it can appreciated that the properties of the PLA based biocomposites could be appropriate for designing flexible or rigid food packaging depending of the bioplasticizer used.
Innovative Poly Methyl Acrylate Intubation Device Used in Difficult Airway Instrumentation of Patients with Pharyngeal Tumors
Authors: Hainarosie Razvan , Tanase Narcis , Zainea Viorel , Pietrosanu Catalina , Ionita Irina , Stefanescu Dragos Cristian
Published: January 2020

Difficult airway management is a common situation when the anesthesiologist deals with patients with hypo pharyngeal tumors. The volume of the tumor usually covers the glottis plan and modifies the local anatomy, making the intubation process difficult or almost impossible. Intubation laryngoscopes developments are minor and adding a CCD camera at the tip of the laryngoscope is the best improvement made in our days. Today, on the market, an intubation device designed properly for the patients with extensive hypo pharyngeal tumors does not exist. The aim of the paper is to present an innovative device designed for patients with hypo pharyngeal tumors.
On Physical and Chemical Characteristics of Poly(methylmethacrylate) Nanocomposites for Dental Applications. I.
Authors: Totu Eugenia Eftimie , Cristache Corina Marilena , Voicila Elena , Oprea Ovidiu , Agir Ismail , Tavukcuoglu Ozlem , Didilescu Andreea Cristiana
Published: January 2020

The objective of this paper is to present the thermal behavior of various PMMA/TiO2 nanocomposite for complete dentures fabrication with 3D printing technology. There have been prepared and thermally characterized polymeric composites with varied nanofiller content ranging between 0.2% and 2.5% (w/w%). The nanocomposites proved a better thermal performance than that of pure copolymer PMMA-MMA or 3D printing PMMA polymer complex matrix. A small difference in glass transition (Tg) temperature for all compounds studied was recorded.
Effects of (complementary) Polyelectrolytes Characteristics on Composite Calcium Carbonate Microparticles Properties
Authors: Mic Cristian Barbu , Mihai Marcela , Varganici Cristian Dragos , Schwarz Simona , Scutaru Dan , Simionescu Bogdan C.
Published: January 2020

This study follows the possibility to tune the thermal stability of some CaCO3/polymer composites by crystal growth from supersaturated solutions controlled by polymer structure or by using nonstoichiometric polyelectrolyte complexes (NPECs). As the ratio between the organic and inorganic parts in the composites controls the Ca2+/polymer network crosslinking density, the CaCO3/polymer weight ratio was kept constant at 50/1, varying the initial concentration of the polyanions solutions (0.05 or 0.06 wt.%), the NPECs molar ratio , n+/n- (0.2 or 0.4), or the inorganic precursors concentration (0.25 or 0.3 M). Poly(2-acrylamido-2-methylpropanesulfonic acid-co-acrylic acid) (PSA) and chondroitin-4-sulfate (CSA) were used as polyanions. Some NPEC dispersions, prepared with the same polyanions and poly(allylamine hydrochloride) (PAH), were also used for calcium carbonate crystallization. The characteristics of the prepared composites were investigated by scanning electron microscopy (SEM), flow particle image analysis (FPIA), particles charge density (CD), zeta-potential (ZP). The thermal stability of the composite particles was investigated as compared to bare CaCO3 microparticles prepared at the same initial inorganic concentrations.
A New Colorimetric Assay for Determination of Selected Toxic Vapors and Liquids Permeation Through Barrier Materials Using the Minitest Device
Authors: Otrisal Pavel , Florus Stanislav , Svorc Lubomir , Barsan Ghita , Mosteanu Danut
Published: January 2020

A moment of permeation of both gaseous and liquid phases of a toxic compound through a barrier material has been indicated colorimetrically at the same time on 20 exposed places using suitable colour indicators. The newly developed device MINITEST is able to evaluate the resistivity of both porous and non-porous barrier materials of a textile character against permeation of toxic vapours (permeation) and liquids (penetration) in static conditions. As a model test chemical either the sulfur mustard or significantly alkaline or acid volatile toxic compound have been applied. During the permeation, these species react with a suitable acid-base indicator and a markedly coloured stain can be created. Newly developed MINITEST device enables determination of chemical resistance of areal barrier materials not only in a process of their development but also in the rate of their practical applications.
Procalcitonina - Diagnostic Marker in Neonatal Sepsis
Authors: Milulescu Amelia , Dorneanu Florin , Iacob Daniela , Stoian Dana , Petre Izabella , Chiriac Veronica Daniela , Margan Roxana , Ionita Ioana , Marti Daniela , Moleriu Lavinia Cristina
Published: January 2020

Procalcitonin was proposed to have been a more specific and better value compared to CRP as a marker of prognosis, although its diagnostic value is also contested.This study was conducted in the Department of Neonatology and the Department of Obstetrics and Gynecology of �Pius Brînzeu� Emergency County Hospital Timisoara on a group of 20 newborns coming from 20 mothers that have been found with low procalcitonin. The gestational age at birth was 36-39 weeks. PCT values do not correlate and do not indicate correctly viral infections. Serum PCT levels must be interpreted within the clinical setting; there are many other causes that could lead to its growth. Our study consists of two different parts. In the first part we computed a regression model in order to see if there is any association between the vales of procalcitonin obtained from the blood analysis of the mother and the procalcitonin of her child.
Polymeric Alternatives in Manufacturing Removable Partial Dentures
Authors: Ardelean Lavinia Cosmina , Bortun Cristina Maria , Podariu Angela Codruta , Rusu Laura Cristina
Published: January 2020

Traditionally, removable partial dentures consist of a metallic framework, covered by acrylic saddles, which support acrylic or ceramic teeth. Because their shortcomings, new classes of resins/macromolecular compounds which promise better quality are nowadays available for manufacturing removable partial dentures: urethane-based resins, polyamides, acetal resins, high-performance polymers. Manufacturing these new materials implies alternative technologies like: injection, milling, light-curing. Using these alternative polymeric materials results in dentures with better resistance, elasticity, appearance and lower weight, which provide much more comfort to the patient.
Cochlear Implant Strategies and Biomaterials from Past to Future
Authors: Martu Marius Cristian , Cozma Sebastian , Martu Vasile Dan , Serban Roxana , Bularda Dragos , Butnaru Corina , Radulescu Mihaela Luminita
Published: January 2020

The cochlear implant (C.I.) is a neurobionic prosthesis, being one of the greatest achievements of auditory neuroscience. Although C.I. represents the gold standard in the treatment of deafness in both the child and the adult, some problems like perception of speech in noise (atmosphere, environment), perception of music, binaural hearing remain, aspect to which improvements are expected. The article (this review) revises the road from the first attempts to cochlear implantation to today�s modern and reliable cochlear implant. Continuous improvement of existing technology both in terms of biomaterials used and in terms of speech processing and simultaneous stimulation strategies, promise with certainty the introduction of C.I. with superior performance. A look in the future is through new ideas and techniques, which await the transition from the experimental to the clinical stage in the emergence of a new generation of implants.
Construction of Plastic Parts on CNC Engraving Machines and 3D Printers
Authors: Prodan Dan , Bucuresteanu Anca , Motomancea Adrian
Published: January 2020

This work presents some of researches performed by the authors on execution of plastic parts required for repair works specific to certain machines and plants. Authors focused especially on the repair and reconditioning of certain assemblies which include various machine parts: special spacers, machine-tools guides and toothed gears. Methods shown herein are very simple, accessible even to small workshop and they do not require special equipment, thereby involving minimal expenses. The use of simple programs allow fast and low-cost execution of parts with an accurately determined geometry.
The Assessment of the Surface Status Following the Action of Some Acidic Beverages on Indirect Restorative Materials
Authors: Tofan Nicoleta , Andrian Sorin , Stoleriu Simona , Nica Irina , Moldovanu Antonia , Topoliceanu Claudiu , Solomon Oleg , Pancu Galina
Published: January 2020

The study aimed to assess the changes of the surface roughness induced by some acidic beverages on indirect restorative materials by using profilometry. Twenty samples of three composite resins (Ceramage, SR Adoro, Luna-Wing) and three ceramics (IPS In Line, Hera Ceram, Reflex Dimension) immersed in three acidic beverages (Red Bul, wine, Coca Cola), for 5 minutes, three times daily, 14 days. The control samples were immersed in artificial saliva during the study periode. After the end of the erosive cycles and before to determine the surface roughness of the samples in the study groups, all the samples were immersed in artificial saliva for 18 hours. The surface roughness was determined in relation to the baseline surface using profilometer Perthometer_M1 (Mahr Gottingen GmbH, Germany). The immersion of the indirect restorative materials tested in the three acidic beverages lead has resulted to changes in their surface roughness. The most aggressive was wine, followed by Coca Cola, and Red Bull.
Improvement of Polymer Surface Properties Using the Deposition with Thin Metal Alloy Layers
Authors: Spanu Alina , Besnea Daniel , Voiculescu Ionelia
Published: January 2020

The paper describes the advantages of material deposition using the resistive vaporization method, so that new very thin layer, which is about ìm, could be used on polymer base structure. Due to the new properties involving the friction coefficient on plane surface, where some dynamic forces are acting, we may better control the performances. By analyzing the theoretical aspects of entropy rate production, we may determine the maximum friction providing the stability of wear avoiding the material deterioration during the process.
Toxicological Assessment of Betulin Entrapped in a Polyurethane Carrier
Authors: Borcan Florin , Soica Codruta M. , Lazureanu Voichita , Pinzaru Iulia A. , Cheveresan Adelina , Poenaru Marioara
Published: January 2020

Natural mixtures based on bioflavonoids, terpenoids, glycosidic compounds, polyphenols, anthocyanins and essential fatty acids are often more effective and non-toxic than many synthetic drugs. Betulin, a terpene compound with many key-roles in alternative medicine, is almost insoluble in water due to its pentacyclic structure. Different drug carriers are developed to improve the drug efficacy and release. This paper described the evolution of some skin parameters (transepidermal water loss, erythema and stratum corneum hydration) after a short and respectively a long exposure to a polyurethane carrier with and without betulin using sodium lauryl sulfate as reference. It was found that these compounds are safe for human use and the hydratant effect of betulin was reconfirmed.
The Thermal Behavior of Hybrid Fabric Reinforced Composites with Stratified Filled Epoxy Matrix
Authors: Stefanescu Victorita , Boboc Ana , Cojan A. , Bosoanca R. , Muntenita cristian , Bunea Marina
Published: January 2020

In this research, the thermal performance of the hybrid composites with modified epoxy matrix was investigated. The results were compared with those presented by the hybrid composites with homogeneous epoxy matrix. For understand the effects of the replacement of lower specific density glass fabric by higher specific density glass fabric, the thermal properties of the hybrid epoxy composites were determined by comparison to the thermal results of composites reinforced with lower specific density glass fabric with those of the hybrid epoxy materials reinforced with higher specific density glass fabric. Also, the effects on the specific heat and thermal expansion coefficient of the used fabric types in outer sheets of the composites were studied.
In vitro Evaluation of Accuracy of Single Dies Captured by Two Intraoral Digital Scanners
Authors: Burde Alexandru Victor , Gasparik Cristina , Moldovan Marioara , Baciu Sorana , Cosma Cosmin
Published: January 2020

The objective of this in-vitro study was to compare the accuracy, defined as trueness and precision, of two intraoral digital scanners that use different capturing techniques. An experimental reference object consisting of a die was manufactured from a PMMA resin. The reference object was digitized with an industrial CT and was scanned 15 times with each scanner. In order to asses trueness, comparisons were made with the virtual reference model, and for fidelity, the first scan in the series was compared with the following scans. For both fidelity and trueness, the F test and T tests demonstrate that there is a statistically significant difference between the scanners.
Dimensional Study of Impacted Maxillary Canine Replicas 3D Printed Using Two Types of Resin Materials
Authors: Nagib Riham , Szuhanek Camelia , Moldoveanu Bogdan , Negrutiu Meda Lavinia , Duma Virgil Florin , Sinescu Cosmin , Brad Silviu
Published: January 2020

3D printing paired with CBCT imaging technology could provide a more individualised approach to orthodontic diagnosis and tratment. The aim of the present study is to asses dimensional differences between the CBCT image and 2 types of 3D printed replicas of an impacted maxillary canine, and to determine whether this method could be used in the future development of customised orthodontic attachments. Ten replicas were printed using the STL file of the impacted canine using two types of resin- five of each, with the same printer. Linear measurements of maximum height, length and width, were made. Mean dimensional erorrs were 0.184 mm and 0.068 mm. The largest discrepancy was in lenght - 0.362 mm. More reasearch is needed, but in this study we obtained printed resin replicas that provide sufficient dimensional accuracy to be used in orthodontics.