bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Novel Method to Evaluate Cement-Shale Bond Strength
Authors: Liu Xiangyu , Nair Sriramya D. , Cowan Mike , van Oort Eric 
Published: April 2015

Abstract
The incompatibility of cement and shale and the subsequent failure of primary cementing jobs is a very significant concern in the oil & gas industry. On wells ranging from hydraulically fractured shale land wells to deepwater wells, this incompatibility leads to an increased risk in failing to isolate zones, which could possibly present a well control hazard and can lead to sustained casing pressure. The cement-shale interface presents a weak link that often becomes compromised by the loads incurred either during drilling, completion/stimulation or production phases.
To formulate cements for effective zonal isolation, it is crucial to evaluate the bond strength of the cement-shale interface. Although several studies have focused on the interactions between cement and sandstone, very few studies have addressed the bonding behavior of cement with shale. The conventional push-out test protocol used to measure cement-to-sandstone shear bond strength has proven to be difficult to apply to shale due to its laminated and/or brittle nature that complicates sample preparation and can lead to shale or cement matrix failure instead of failure at the interface. In this paper, we present a novel, simple and versatile laboratory test procedure to measure the shear bond strength between cement and shale.
The new procedure was used to develop cement formulations to improve the cement-to-shale bond. Various types of surfactants were added to cement slurry to evaluate their effects on cement bonding property. Our results indicate that bond strength of cement with shale can be enhanced by incorporating particular surfactants in cement slurries.
Orbitographie et échantillonnage temporel : le logiciel IXION (Orbitography and temporal sampling : the IXION software)
Authors: Capdérou Michel 
Published: April 2015

Abstract. - Spatial agencies provide position of satellites with a great accuracy. But user of satellite data has no information about temporal sampling : when and how a location on the Earth is seen by satellite, during a given duration ?
The IXION software, which we developed for application to any satellite, provides orbitography and temporal sampling : the time of each overpass is given, together with the positions of the satellite and the Sun (at the same moment), expressed as zenith and azimuth angles.
Environnement et « global change » : une recherche pluridisciplinaire, multi-échelles et multimédia (Environment and global change : a multidisciplinary, multimedia and multiscale research)
Authors: Bardinet Claude 
Published: April 2015

Résumé. - La recherche sur les évolutions climatiques et leur explication en tant que phénomène naturel cyclique ou comme conséquence de l'action de l'homme sur les milieux géographiques et sur l'environnement, suppose une observation à différents niveaux thématiques et chronologiques, et à différentes échelles géographiques. Cette recherche met en relation, à toutes échelles, les faits de géographie physique et ceux résultants de la transformation des milieux naturels par les sociétés humaines.
Elle utilise pour ce faire les moyens informatiques les plus complets. La croissance rapide des bases de données satellitaires et thématiques entraîne l'utilisation la plus large des outils nouveaux de l'analyse des données. L'émergence des technologies multimédia favorise la circulation de l'information scientifique et technique. Les sciences de l'environnement doivent utiliser les réseaux de type InterNet en contrôlant la qualité et la mise à jour de l'information, et en s'assurant que les bonnes informations sont accessibles pour la recherche scientifique et pour les acteurs du développement économique et social.
Comparative Effects of Photodynamic Therapy mediated by Curcumin on Standard and Clinical Isolate of Streptococcus mutans
Authors: Paschoal Marco Aurelio , Tonon Caroline C , Correia Marilia , Spolidório Denise MP , Bagnato Vanderlei S , Giusti Juçaíra SM , Santos-Pinto Lourdes 
Published: April 2015

ABSTRACT

Aim
The aim of this study was investigate the effect of photodynamic therapy (PDT) using curcumin (C) as a photosensitizing agent irradiated with an LED (L) in the blue wavelength as a light source on a standard and clinical isolate of Streptococcus mutans (S. mutans) in a planktonic suspension model.

Materials and methods
Suspensions of both strains were divided into 4 groups as follows: absence of C and L (control group: C–L–), with C and without L (C group: C+L–), absence of C with L (L group: C–L+) and presence of C and L (PDT group: C+L+). Three different concentrations of curcumin (0.75 mg/ml, 1.5 mg/ml and 3 mg/ml) and three light fluences of studied light source (24, 48 and 72 J cm–2) were tested. Aliquots of each studied group was plated in BHI agar and submitted to colony forming units counting (CFU/ml) and the data transformed into logarithmical scale.

Results
A high photoinactivation rate of more than 70% was verified to standard S. mutans strain submitted to PDT whereas the clinical isolate showed a lower sensitivity to all the associations of curcumin and LED. A slight bacterial reduction was verified to C+L– and C–L+, demonstrating no toxic effects to the isolated application of light and photosensitizer to both S. mutans strains tested.

Conclusion
Photodynamic therapy using a combination of curcumin and blue LED presented a substantial antimicrobial effect on S. mutans standard strain in a planktonic suspension model with a less pronounced effect on its clinical isolate counterparts due to resistance to this alternative approach.

Clinical significance
Alternative antimicrobial approaches, as photodynamic therapy, should be encouraged due to optimal results against cariogenic bacteria aiming to prevent or treat dental caries.

How to cite this article
Tonon CC, Paschoal MA, Correia M, Spolidório DMP, Bagnato VS, Giusti JSM, Santos-Pinto L. Comparative Effects of Photodynamic Therapy mediated by Curcumin on Standard and Clinical Isolate of Streptococcus mutans. J Contemp Dent Pract 2015;16(1):1-6.
Influence of pH Change and Water Storage on the Sealing Ability of Two Resin-based Root-filling Materials
Authors: de Fátima Carvalho Souza Soraia , de Souza Douglas Nesadal , de Fátima Vasconcelos Pereira Adriana , Barroso Lúcia Pereira , Bombana Antonio Carlos 
Published: April 2015

ABSTRACT

Aim
To evaluate the influence of pH change and water storage up to 90 days on the sealing ability of two resin-based rootfilling materials.

Materials and methods
Forty-four human mandibular single-rooted teeth were instrumented and filled with gutta-percha/ AH Plus or Resilon/Epiphany SE (n = 20 per group). Two teeth each were used as positive and negative controls. Specimens were set for 7 days under 100% humidity at 37Â°C. They were allocated into two subgroups (n = 10) according to whether they were tested immediately or stored for up to 90 days in water before testing. Sealing ability was evaluated by passive dye penetration. Absorbance at 630 nm (in μg/ml) was measured by spectrophotometry. The pH values were obtained in triplicate. Data were submitted to ANOVA by post-hoc Tukey's test (α = 0.05).

Results
Specimens filled with Resilon/Epiphany SE exhibited more leakage than specimens filled with gutta-percha/AH Plus at the immediate time point (p < 0.001). No differences were detected between the groups after storage, or between the materials with pH changes after 30, 60 and 90 days (p > 0.05).

Conclusion
Gutta-percha/AH Plus provided superior sealing at the immediate time point. Water storage and pH changes did not influence the sealing ability of tested materials.

Clinical significance
These results suggest that Resilon/ Epiphany SE sealer offered no apparent advantage over the more conventional gutta-percha/AH Plus sealer technique in terms of sealing ability.

How to cite this article
de Fátima Carvalho Souza S, de Souza DN, de Fátima Vasconcelos Pereira A, Barroso LP, Bombana AC. Influence of pH Change and Water Storage on the Sealing Ability of Two Resin-based Root-filling Materials. J Contemp Dent Pract 2015;16(1):36-41.
Evaluating the Cariogenic Potential of Flavored Milk: An Experimental Study using Rat Model
Authors: Al-Jobair Asma , Khounganian Rita 
Published: April 2015

ABSTRACT

Objective
The purpose of this study was to evaluate and to compare the cariogenic potential of different commonly consumed flavored milk on caries development in rat's molar teeth.

Materials and methods
Sixty Sprague-Dawley rats infected with an active growing culture of Streptococcus mutans were offered chocolate flavored milk, strawberry flavored milk, banana flavored milk, plain milk, sweetened plain milk with 5% sucrose, and 10% sucrose ad libitum.

Results
Rats consuming flavored milk developed significantly lower sulcal and smooth surface caries scores than rats consuming 10% sucrose. However, rats consuming plain milk developed significantly lower sulcal and smooth surface caries scores than animals consuming flavored or sweetened plain milk except for chocolate flavored milk.

Conclusion
It was concluded that flavored milk containing 5% sucrose showed a moderate cariogenic potential.

Clinical significance
Although the overall results suggest that the cariogenic potential of flavored milk is moderate and despite their nutritional value, occasional consumption of flavored milk as a beverage might be accepted with caution. Parents, dental practitioners and other healthcare professionals should be aware of the cariogenicity of flavored milk. They should keenly encourage the use of plain milk and discourage the use of any cariogenic drink which has a deleterious effect on teeth.

How to cite this article
Al-Jobair A, Khounganian R. Evaluating the Cariogenic Potential of Flavored Milk: An Experimental Study using Rat Model. J Contemp Dent Pract 2015;16(1):42-47.
Hardness and Surface Roughness of Enamel and Base Layers of Resin Denture Teeth after Long-term repeated Chemical Disinfection
Authors: Neppelenbroek Karin Hermana , Kurokawa Luciana Ayumi , Procópio Andréa Lemos Falcão , Pegoraro Thiago Amadei , Hotta Juliana , Lima Jozely Francisca Mello , Urban Vanessa Migliorini 
Published: April 2015

ABSTRACT

Aim
To evaluate the effect of successive cycles of disinfection in different denture cleansers on the surface roughness and the Vickers hardness of two layers of acrylic resin (base-BL and enamel-EL) of two commercial cross-linked artificial teeth.

Materials and methods
The occlusal surfaces of 60 acrylic resin denture posterior teeth (Trilux-TLX and SR Orthosit PE-SRO) embedded in autopolymerizing acrylic resin were ground flat with 1200-grit silicon carbide paper. Specimens were stored in distilled water at 37°C and then submitted to the microhardness (VHN) and roughness (ìm) tests. Specimens were stored in distilled water at 37°C for 90 days and submitted to 720 disinfection cycles in sodium hypochlorite at 0.5%, 30% vinegar solution or distilled water (control). Afterward, microhardness and roughness tests were again performed. Data were analyzed using two-way ANOVA and Tukey's test (α = 0.05).

Results
Hypochlorite immersion decreased the hardness of BL and EL of SRO teeth, with an average reduction of 10.11% (p < 0.008). TLX teeth demonstrated a hardness reduction of 28.96% of both layers for all solutions including water (p < 0.0000). The roughness of both teeth was not affected by denture cleansers (p > 0.37).

Conclusion
Hypochlorite promoted deleterious effects on the hardness of both layers of the artificial teeth tested. Immersion in vinegar and water also resulted in reduction of hardness of TLX teeth.

Clinical significance
The surface hardness of the different layers of cross-linked artificial teeth can be altered by daily disinfection in denture cleansers commonly indicated for removable dentures.

How to cite this article
Neppelenbroek KH, Kurokawa LA, Procópio ALF, Pegoraro TA, Hotta J, Lima JFM, Urban VM. Hardness and Surface Roughness of Enamel and Base Layers of Resin Denture Teeth after Long-term repeated Chemical Disinfection. J Contemp Dent Pract 2015;16(1):54-60.
A Tomographic Study of the Mandibular Condyle Position in Partially Edentulous Population
Authors: Ammanna Susan , Rodrigues Anisha , Shetty N Sridhar , Shetty Karunakar 
Published: April 2015

ABSTRACT

Background and objectives
The influence of the loss of teeth on the condylar position and on temporomandibular joint (TMJ) dysfunction syndrome remains a controversial issue. This study analyses the condylar position by means of a tomogram in partially dentate subjects which serves as a guide to predict which of the partially dentate statuses is prone to develop TMJ dysfunction syndrome in personnel without symptoms of the same.

Methodology
Eighty personnel were enrolled in this study consisting of Kennedy's class I, II, III, IV and control to analyze the condylar position by means of a tomogram. In all the five groups TMJ sectional tomogram programmed in a panoramic radiographic machine (PLANMECA PM 2002 CC PROLINE) was taken with the subjects at maximal intercuspal position and rest position. Tomograms were evaluated using linear measurements of the anterior and posterior intra-articular joint spaces on the basis of drawings and tracings.

Results
The results of the study revealed a predominance of reduced posterior condylar space in Kennedy's class I and II. A disparity was seen between the maximum intercuspal position and rest position, where the posterior joint space was reduced in the rest position.

Conclusion
Within the limitations of this study, it has been revealed that in Kennedy's classes I and II, for partially dentate personnel, a posterior displacement of the condyles was seen. This predisposition would suggest towards the necessity of restoring the missing dentition in order to maintain the harmony of the stomatognathic system.

How to cite this article
Ammanna S, Rodrigues A, Shetty NS, Shetty K, Augustine D, Patil S. A Tomographic Study of the Mandibular Condyle Position in Partially Edentulous Population. J Contemp Dent Pract 2015;16(1):68-73.
Dual-Task Performance Involving Hand Dexterity and Cognitive Tasks and Daily Functioning in People With Schizophrenia: A Pilot Study
Authors: Lin Keh-chung , Wu Yi-fang , Chen I-chen , Tsai Pei-luen , Wu Ching-yi , Chen Chia-ling 
Published: April 2015

Abstract
OBJECTIVE. This study investigated separate and concurrent performance on cognitive and hand dexterity tasks and the relationship to daily functioning in 16 people with schizophrenia and 16 healthy control participants.
METHOD. Participants performed the Purdue Pegboard Test and the Serial Seven Subtraction Test under single- and dual-task conditions and completed two daily functioning evaluations.
RESULTS. The hand dexterity of all participants declined in the dual-task condition, but the discrepancy between single-task and dual-task hand dexterity was greater in the schizophrenia group than in the control group (p &lt; .03, d &gt; .70, for all). The extent of discrepancy in hand dexterity was negatively correlated with daily functioning in the schizophrenia group (rs = −.3 to −.5, ps = .04–.26).
CONCLUSION. Ability to perform dual tasks may be an indicator of daily functioning in people with schizophrenia. Use of dual-task training may be considered as a therapeutic activity with these clients.
Feasibility of a Sensory-Adapted Dental Environment for Children With Autism
Authors: Cermak Sharon A. , Stein Duker Leah I. , Williams Marian E. , Lane Christianne Joy , Dawson Michael E. , Borreson Ann E. , Polido José C. 
Published: April 2015

Abstract
OBJECTIVE. To provide an example of an occupational therapy feasibility study and evaluate the implementation of a randomized controlled pilot and feasibility trial examining the impact of a sensory-adapted dental environment (SADE) to enhance oral care for children with autism spectrum disorder (ASD).
METHOD. Twenty-two children with ASD and 22 typically developing children, ages 6–12 yr, attended a dental clinic in an urban hospital. Participants completed two dental cleanings, 3–4 mo apart, one in a regular environment and one in a SADE. Feasibility outcome measures were recruitment, retention, accrual, dropout, and protocol adherence. Intervention outcome measures were physiological stress, behavioral distress, pain, and cost.
RESULTS. We successfully recruited and retained participants. Parents expressed satisfaction with research study participation. Dentists stated that the intervention could be incorporated in normal practice. Intervention outcome measures favored the SADE condition.
CONCLUSION. Preliminary positive benefit of SADE in children with ASD warrants moving forward with a large-scale clinical trial.
Behavioral Intention to Use a Virtual Instrumental Activities of Daily Living System Among People With Stroke
Authors: Ellington Allison , Adams Richard , White Marga , Diamond Paul 
Published: April 2015

Abstract
OBJECTIVE. The purpose of this study was to investigate the behavioral intention to use (BIU) regarding a virtual system for practicing instrumental activities of daily living (IADLs) among people with stroke.
METHOD. Fourteen people who had sustained a stroke used a virtual world–based system over four sessions to participate in virtual occupations of preparing meals and putting away groceries. To investigate intention to use the technology, participants responded to a questionnaire based on the Technology Acceptance Model and were interviewed about the experience.
RESULTS. Analysis of questionnaire responses revealed favorable attitudes toward the technology and statistically significant correlations between these attitudes and positive BIU. Analysis of qualitative data revealed four themes to support system use: Use of the affected arm increased, the virtual practice was enjoyable, the technology was user-friendly, and the system reflected real-life activities.
CONCLUSION. This study shows that participants reported a positive BIU for the virtual system for practicing IADLs.
Client and Therapist Perspectives on the Influence of Low Vision and Chronic Conditions on Performance and Occupational Therapy Intervention
Authors: Barstow Beth A. , Warren Mary , Thaker Swetal , Hallman Allison , Batts Penelope 
Published: April 2015

Abstract
OBJECTIVE. We explored how vision loss and comorbid chronic conditions influence occupational therapy intervention by gathering perspectives from occupational therapists treating clients with low vision and from older adults with low vision.
METHOD. We surveyed 59 occupational therapists on the frequency of comorbidities in their clients and their influence on low vision intervention. Eight older adults with low vision participated in in-depth interviews and observations on the influence of low vision and comorbidities on their occupational performance. Conclusions reflect data analysis from both methods.
RESULTS. The occupational therapists modified low vision interventions to address the added effect of each comorbidity. Modifications included more treatment sessions, home visits, referrals to other professions, and provision of strategies to address comorbidities. The older adults viewed vision loss as a stronger influence than comorbidities on independence in daily occupations.
CONCLUSION. Both vision loss and comorbidities influence occupational performance, supporting the need for interventions to address both conditions.
Parents’ Understanding of Play for Children With Cerebral Palsy
Authors: Graham Naomi E. , Truman Juliette , Holgate Heather 
Published: April 2015

AbstractOBJECTIVE. To present the findings of an exploratory study regarding the experience of play as an everyday occupation for children with severe cerebral palsy from their parents’ perspective.METHOD. We took a qualitative methodology and interpretive descriptive approach. After ethical approval, 7 participants were recruited and completed an interview and contextual information sheet.RESULTS. The interview data led to the exploration of four themes: typical play, burden of play, expanding the concept of play, and therapy and play. These components were interlinked and contributed to parents’ understanding of play.CONCLUSION. Occupational therapy practitioners can aim to further understand the importance of affirming typical play, recognizing the burden of play, explaining expanded play, and explaining the importance of play for play’s sake.
Fear of Falling in People With Chronic Stroke
Authors: Schmid Arlene A. , Arnold Sarah E. , Jones Valerie A. , Jane Ritter M. , Sapp Stephanie A. , Van Puymbroeck Marieke 
Published: April 2015

Abstract
OBJECTIVE. We assessed the prevalence of fear of falling (FoF) in a sample of people with chronic stroke and compared multiple variables (balance, anxiety, depression, activity and participation, and stroke severity) in people with and without FoF.
METHOD. This study was a secondary analysis of data collected from a cross-sectional study of mobility after stroke in 77 participants with chronic stroke (&gt;6 mo poststroke).
RESULTS. Of the 77 participants, 51 (66%) reported experiencing FoF. People with FoF had significantly decreased balance (p &lt; .001) and activity and participation (p = .006) and significantly increased anxiety (p = .007). People with FoF also had significantly worse stroke severity (p = .001).
CONCLUSION. FoF is a prevalent concern in the chronic stroke population. The presence of FoF was associated with a variety of negative consequences. Occupational therapy practitioners should address FoF to help clients manage FoF and possibly improve recovery.
Evaluation of Instrumentation Systems in Reducing E. Faecalis from Root Canals: TF Adaptive and ProTaper Next Versus Single File Systems
Authors: Karataş Ertuğrul , Gültekin Esra , Arslan Hakan , Kιrιcι Damla Özsu , Alsancak Meltem , Topçu Meltem Çolak 
Published: April 2015

Purpose To compare the effect of the TF Adaptive, ProTaper Next, OneShape, WaveOne, Reciproc, (SAF) on the reduction of E. faecalis in experimentally infected root canals. Materials and Methods 70 human mandibular incisor teeth with straight roots and single root canals were selected for this experiment and the root canals of the selected teeth were infected with E. faecalis. After contamination, all the root canals were randomly divided into 7 groups: control, ProTaper Next, TF Adaptive, SAF, WaveOne, Reciproc, and OneShape. After the irrigation procedures, samples were taken from root canals with paper points and incubated in blood agar plates. The colonies grown on the blood agar were counted and interpreted as colony forming units per milliliter. Results Analysis of results showed that all instrumentation systems were more effective in reducing the number of bacteria than the control ( P<.001). The ProTaper Next, TF Adaptive, WaveOne, Reciproc, and OneShape systems were significantly more effective than the SAF system in reducing E. faecalis within the root canals ( P<.001). Conclusions All instrumentation systems used in this study provided a significant reduction in bacterial populations.