bluuebunny/crossref_metadata_2025_split huggingface dataset:
Long-Term Study of Dental Implants Placed into Alveolar Cleft Sites
Authors: Matsui Yoshiro , Ohno Kohsuke , Nishimura Akiko , Shirota Tatsuo , Kim Syutaku , Miyashita Hajime 
Published: July 2007

Objective: To evaluate the long-term prognosis of dental implants placed into cleft sites after bone grafting in a relatively large number of cases in order to clarify the usefulness of the modality. Patients: Forty-seven patients with unilateral (dental, n = 32) or bilateral (n = 15) clefts of the alveolar process were included in this study. Interventions: A total of 71 implants, including smooth- or rough-surface titanium, and hydroxyapatite (HA)-coated implants, were placed after bone grafting from the anterior iliac crest and/or mandible. The placed implants were 13 to 15 mm in length. Main outcome: The follow-up period was from 21 to 120 months (average = 60 months). Implant survival rates were calculated as cumulative survival. Marginal bone loss (MBL) from the implant shoulder was examined, with statistical analyses performed on the influence of simultaneous bone graft and surface characteristics. Results: At the end of the clinical follow-up period, all implants except one were in situ and stable. Thus, the overall survival rate was 98.6% at the end of the first year and remained the same until the end of observation. Titanium implants with smooth surfaces had the lowest MBL with almost negligible regression slope, although some implants had relatively high MBL by the end of the first year. Conclusions: Implant therapy in the cleft site offers a reliable option for patients. Particular attention should be focused preoperatively on whether bone volume can provide primary implant stability.
Stress Velopharyngeal Incompetence: Prevalence, Treatment, and Management Practices
Authors: Malick Deonne , Moon Jerry , Canady John 
Published: July 2007

Objective: Stress velopharyngeal incompetence is the unwanted coupling of the oral and nasal cavities while brass and woodwind musicians play their instruments. This study investigated both (1) the prevalence of stress velopharyngeal incompetence in college musicians, delineating symptoms and situations possibly associated with the condition; and (2) physicians’ experiences with musicians exhibiting stress velopharyngeal incompetence, including typical treatment and management techniques. Methods: Questionnaires were distributed to 297 brass or woodwind student musicians at three public universities and to 998 plastic surgeons and otolaryngologists. The musician questionnaire focused on demographic data and identification of symptoms that might indicate the presence of stress velopharyngeal incompetence. The physician questionnaire addressed demographics of the physician and his or her practice, familiarity and experience with stress velopharyngeal incompetence, and treatment and management suggestions for individuals experiencing the condition. Results: Thirty-four percent of the responding musicians reported symptoms of stress velopharyngeal incompetence, most often after 30 minutes of playing. Forty-five percent of the responding physicians reported being familiar with the term stress velopharyngeal incompetence, although only 27% reported ever having seen a patient with the condition. The seven most frequently reported intervention strategies were referral to a speech language pathologist (47.50%), sphincter pharyngoplasty (30.00%), pharyngeal flap (26.88%), referral to a cleft palate team (24.38%), watch and wait (18.75%), posterior wall fat injection (12.50%), and palatal lift (10.00%). Conclusions: Stress velopharyngeal incompetence is a potentially career-ending (or career-preventing) problem that currently may be undertreated and that is in need of more systematic study both in terms of its physiologic underpinnings and its management.
Tissue Plasminogen Activator and Plasminogen Activator Inhibitor‐1 Gene Polymorphisms in Patients With Chronic Periodontitis
Authors: Gürkan Ali , Emingil Gülnur , Saygan Buket Han , Çınarcık Serhat , Atilla Gül , Köse Timur , Berdeli Afig 
Published: July 2007

Background: Tissue plasminogen activator (t‐PA) and plasminogen activator inhibitor type 1 (PAI‐1) are involved in the pathogenesis of periodontitis by controlling proteolytic events in the extracellular matrix. This study was designed to investigate the association of t‐PA and PAI‐1 gene polymorphisms with chronic periodontitis (CP).Methods: One hundred eighty‐nine subjects were included. Genomic DNA was obtained from the peripheral blood of 84 patients with CP and 105 periodontally healthy subjects. Polymerase chain reaction and endonuclease digestion was used to genotype the 4G/5G polymorphism in the promoter region of the PAI‐1 gene and the Alu‐repeat insertion (I)/deletion (D) polymorphism in intron 8 of the t‐PA gene.Results: The genotype distributions and allele frequencies of t‐PA polymorphism were not different between patients with CP and healthy subjects (24.7% I/I, 45.7% I/D, and 29.6% D/D and 30.3% I/I, 45.5% I/D, and 24.2% D/D, respectively; P >0.05). The t‐PA D allele frequency was similar in patients with CP (52.4%) and healthy subjects (46.5%). PAI‐1 genotype distribution in patients with CP (30.9% 4G/4G, 35.8% 4G/5G, and 33.3% 5G/5G) and healthy subjects (36.2% 4G/4G, 41.9% 4G/5G, and 21.9% 5G/5G) was also similar. The 4G allele frequency was not different between patients with CP (48.8%) and healthy subjects (57.1%) (P >0.05). The 4G allele frequency in non‐smoking CP patients was significantly lower than in non‐smoking, healthy subjects (χ2 = 4.201; P = 0.040). Non‐smoking CP patients also had a significantly lower percentage of 4G‐positive genotypes compared to non‐smoking healthy subjects (χ2 = 5.046; P = 0.025).Conclusions: t‐PA or PAI‐1 genotypes are not associated with susceptibility to CP in Turkish subjects. Conversely, the 4G allele of the PAI‐1 gene could be related to a decreased susceptibility to CP in non‐smokers.
Effect of Er:YAG Laser Combined With rhPDGF‐BB on Attachment of Cultured Fibroblasts to Periodontally Involved Root Surfaces
Authors: Belal Mahmoud Helmy , Watanabe Hisashi , Ichinose Shizuko , Ishikawa Isao 
Published: July 2007

Background: The use of the erbium‐doped:yttrium, aluminum, and garnet (Er:YAG) laser in periodontal therapy has been the focus of much research. Recombinant human platelet‐derived growth factor‐BB (rhPDGF‐BB) is suggested as a potent stimulator and strong mitogen for human periodontal ligament cells. The present study tested the direct effects of Er:YAG laser irradiation, alone or with rhPDGF‐BB application, on the biocompatibility of periodontally diseased roots through fibroblast attachment and proliferation.Methods: The study examined five healthy and 15 periodontally involved teeth, prepared from proximal surfaces, which were divided randomly into four groups (10 specimens each): group 1: healthy; group 2: untreated diseased; group 3: Er:YAG laser irradiation (60 mJ/pulse, 10 Hz); and group 4: Er:YAG laser irradiation (60 mJ/pulse, 10 Hz) plus rhPDGF‐BB application (50 ng/ml). Three subgroups per group (three specimens each) were incubated for three periods (1, 3, or 7 days). The remaining specimen was used to determine surface topography. Fibroblasts were pooled on root specimens and incubated. Results were evaluated using scanning electron microscopy. Repeated cell counts were performed within a representative standard area.Results: Using paired t tests, all experimental groups (except group 2 diseased) showed statistically significant differences between 1‐ and 3‐day and between 1‐ and 7‐day incubation periods, but not between 3‐ and 7‐day incubation periods. Using analysis of variance, the intergroup comparison showed significant differences favoring group 1 over groups 2 and 3 and group 4 over group 2 at the 1‐day incubation period; group 1 was favored over groups 2, 3, and 4 and groups 3 and 4 were favored over group 2 at the 3‐ and 7‐day incubation periods. Comparable effects were shown between groups 3 and 4 for all incubation periods and between groups 2 and 3 and groups 1 and 4 for the 1‐day incubation.Conclusions: Er:YAG laser used alone or in combination with rhPDGF‐BB application may offer a promising periodontal therapy for conditioning root surfaces, although the combined application seemed to be slightly more effective. However, testing laser use in intervals and with parameters <60 mJ/pulse and 10 Hz is required to verify the minimum threshold values necessary to obtain complete root debridement and clarify optimal conditions for fibroblast cell attachment and growth. Further studies are needed to determine ideal parameters for creating the best environment for successful periodontal treatment.
Effects of Er:YAG Laser Compared to Ultrasonic Scaler in Periodontal Treatment: A 2‐Year Follow‐Up Split‐Mouth Clinical Study
Authors: Crespi Roberto , Capparè Paolo , Toscanelli Isabel , Gherlone Enrico , Romanos George E. 
Published: July 2007

Background: The aim of this clinical study was to compare the results of non‐surgical treatment of periodontal disease with an erbium‐doped:yttrium, aluminum, and garnet (Er:YAG) laser to root debridement with an ultrasonic scaler.Methods: Twenty‐five patients furnished two quadrants containing four teeth with probing depths (PD) >4 mm; the quadrants were divided equally between the right and left sides. On one side, teeth were treated by Er:YAG laser using 160 mJ/pulse at 10 Hz (test group); on the contralateral side, teeth were treated by ultrasonic scaler (control group). Clinical baseline data, including plaque index, gingival index, probing depth (PD), and clinical attachment level (CAL), were recorded before treatment and at 3 months and 1 and 2 years.Results: There were statistically significant differences in PD between the test and control groups for pockets of 1 to 4 mm (P <0.05), 5 to 6 mm (P <0.01), and ≥7 mm (P <0.001). However, there were no significant differences between the test and control groups for CAL gain in pockets of 1 to 4 mm; statistically significant differences were found between the test and control groups in pockets of 5 to 6 mm (P <0.01) and ≥7 mm (P <0.001).Conclusion: Er:YAG laser periodontal treatment resulted in statistically significant improvements in PD and CAL gain compared to ultrasonic scaler treatment at 2‐year follow‐up, especially in moderate and deep pockets.
The Iberian Permian Triassic ‘Buntsandstein’ of the Aragonian branch of the Iberian range (Spain) in the West-European sequence stratigraphical framework: a combined palynological and sedimentological approach
Authors: Diez José B. , Bourquin Sylvie , Broutin Jean , Ferrer Javier 
Published: July 2007

Abstract
The Permo-Triassic ‘Buntsandstein’ facies was studied from outcrops in the Aragonian branch of the Iberian range (Zaragoza, Spain). Using an integrated analysis of sedimentological and palynological data, we propose a sequence stratigraphic analysis for the Permo-Triassic deposits in this area. A comparison with the stratigraphical cycles of other parts of the Iberian domain and other peri-Tethyan basins enables us to specify the stratigraphic context of the Lower Triassic in the western European domain and characterize the importance of the Lower Triassic hiatus.
The ‘Buntsandstein’ deposits studied here from the Aragonian branch occur in three outcrop areas: Tabuenca-Rodanas, Morata de Jalón and Fombuena. The Permo-Triassic deposits lie unconformably on the Hercynian (Variscan) basement. The ‘Buntsandstein’ facies were attributed to the ‘Detrital Group’ by Arribas [1984], who recognized four informal formations: the Araviana, Tierga, Calcena and Trasobares formations, in ascending stratigraphic order.
Based on sedimentological criteria indicating fluvio-lacustrine environments for the Araviana cycle, the basal ‘Buntsandstein’ facies of this area can be attributed to the Permian. The discontinuity observed between the Araviana and Tierga formations, and the palaeobotanical evidence indicating an Anisian age (i.e. Middle Triassic) for the Tierga, suggests a hiatus during the Lower Triassic in this area. The Lower Triassic in Spain and many other parts of western Europe is characterized by fluvial sediments preserved in arid palaeoenvironments, associated with occasional aeolian deposits, and lacking any palaeoflora. At the scale of the western European domain, the onset of Triassic sedimentation would appear mainly in the Olenekian. Stratigraphic continuity between Permian and Triassic non-marine deposits, with sediments attributable to the Induan (lower part of the Lower Triassic), is only observed in the central Germanic Basin. In the Aragonian branch, the first Triassic sediments are dated as Anisian and characterize the retrogradational trend of a major cycle (Tierga – Calcareous Group major cycle) showing the vertical evolution from braided rivers to marine Muschelkalk deposits. At the scale of the west-European domain, the Anisian is always characterized by fluvial and fluvio-lacustrine deposits, with palaeosols, passing upward into marine deposits. Thus, the connection with the open sea was established during the Anisian. In this western Peritethyan domain, the diachronous nature of the Muschelkalk transgression is evident: the onset of Muschelkalk facies occurs during the lower Anisian in the Germanic Basin, the middle Anisian in the eastern part of the Paris Basin and the late Anisian in the Iberian Peninsula.
Siamosuchus phuphokensis, a new goniopholidid from the Early Cretaceous (ante-Aptian) of northeastern Thailand
Authors: Lauprasert Komsorn , Cuny Gilles , Buffetaut Eric , Suteethorn Varavudh , Thirakhupt Kumthorn 
Published: July 2007

AbstractA new taxon of a broad-snouted goniopholidid, Siamosuchus phuphokensis, gen. et sp. nov., was discovered in the Sao Khua Formation (ante-Aptian), northeastern Thailand. The specimen is described on the basis of an incomplete skeleton showing the premaxillae, maxillae, nasals, left lacrimal, frontal, left jugal, right postorbital, caudal part of the cranial table, most of the right part of the postcranial skeleton, and several heavily sculptured osteoderms. S. phuphokensis is distinguished from the other broad-snouted goniopholidids on the basis of the following characters: penetration of the nasals in the narial border; presence of a robust and high median ridge on the interorbital surface; lateral margin of the frontal forming the medial edge of the orbit; supraoccipital exhibiting a wide pentagonal shape. A phylogenetic analysis using 101 characters for 29 mesoeucrocodylian taxa and 3 outgroup taxa supports the monophyly of the family Goniopholididae. In addition, the Thai specimen forms a clade with the European Goniopholis. Based on our strict consensus tree, the generic name Goniopholis should be restricted to the European forms only.
Age and environmental evolution of the syn-rift fill of the southern coast of the gulf of Corinth (Akrata-Derveni region, Greece)
Authors: Rohais Sébastien , Joannin Sébastien , Colin Jean-Paul , Suc Jean-Pierre , Guillocheau François , Eschard Rémi 
Published: July 2007

AbstractThe southern coast of the gulf of Corinth exhibits syn-rift deposits, giving insights into the first stages of continental extension as well as the geodynamic evolution of the surrounding Aegean region. The stratigraphy (relative position, 3D geometry, dating) of these deposits is still subject to controversies. The syn-rift evolution of the central part of the southern coast of the Corinth rift is revisited, based on new sedimentological and paleontological data. While ostracods analysis provides precise information about the paleoenvironments, recent advances in palynology supply a more accurate chronology.For the first time, we document marine evidences and Pleistocene evidences below the well-known giant Gilbert-type fan deltas of the Corinth rift. The syn-rift fill records a three-phase history: (1) the Lower Group corresponds to continental to lacustrine environments passing up progressively to brackish environments with occasionally marine incursions from before 1.8 Ma to some time after 1.5 Ma, (2) the Middle Group corresponds to giant alluvial fans and to Gilbert-type fan deltas prograding in an alternating marine and lacustrine environment from around 1.5 Ma to some time after 0.7 Ma, and (3) the Upper Group corresponds to slope deposits, Gilbert-type fan deltas and marine terraces indicating the emergence of syn-rift sediments along the southern coast from at least 0.4 Ma to the present day, with alternating marine and lacustrine deposition controlled by the position of the Mediterranean sea level relative to the Rion Strait sill.
Dovyrenite Ca6Zr[Si2O7]2(OH)4 - A New Mineral from Skarned Carbonate Xenoliths in Basic-Ultrabasic Rocks of the Ioko-Dovyren Massif, Northern Baikal Region, Russia
Authors: Galuskin Evgeny , Pertsev Nikolai , Armbruster Thomas , Kadiyski Milen , Zadov Aleksander , Galuskina Irina , Dzierżanowski Piotr , Wrzalik Roman , Kislov Evgeny 
Published: July 2007

Dovyrenite Ca6Zr[Si2O7]2(OH)4 - A New Mineral from Skarned Carbonate Xenoliths in Basic-Ultrabasic Rocks of the Ioko-Dovyren Massif, Northern Baikal Region, RussiaDovyrenite, simplified formula Ca6Zr[Si2O7]2(OH)4, occurs as an accessory mineral in vein skarns developed in carbonate xenoliths in subvolcanic layered plagiodunite-troctolite series in the Ioko-Dovyren Massif of Proterozoic age, Northern Baikal Region, Buryatia, Russia. Dovyrenite is a late mineral of altered pyroxene and melilite-monticellite skarns. Associated minerals are Zr-bearing phases: fassaitic pyroxene, perovskite and hydrogarnets; and also monticellite, vesuvianite, diopside, foshagite, brucite, calzirtite, tazheranite, baghdadite, apatite, calcite, native bismuth, sphalerite, selenian galena, clausthalite, safflorite, rammelsbergite, pyrrhotite, pentlandite, valleriite, laitakarite, nickeline, nickel-skutterudite. The average structure of dovyrenite is orthorhombic, space group Pnnm, with subcell parameters A = 5.666(16) Å, B = 18.844(5) Å, C = 3.728(11) Å, V = 398.0(2) Å3 and Z = 1. Dovyrenite shows a new type of modular structure with stacking of the tobermorite-like and the rosenbuschite-like layers parallel to (010). Single-crystal structural data point to an incompletely occupied Ca(2) site from the rosenbuschite module which is confirmed by microprobe analyses: ZrO2 16.47, SiO2 32.83, TiO2 0.14, HfO2 0.16, Cr2O3 0.01, CaO 43.87, FeO 0.25, MgO 0.13, MnO 0.02, Nb2O3 0.03; total 99.38 wt% with calculated H2O. The empirical formula is (Ca5.73Fe0.03Mg0.02)σ5.78(Zr0.98Hf0.01Ti0.01)σ1Si4(O13.56OH0.44)σ14(OH)4. The presence of two types of OH group in the dovyrenite structure is corroborated by FTIR and Raman spectroscopy. Dovyrenite is an optically positive biaxial mineral: α 1.659(2), β 1.660(2); γ 1.676(2); 2Vz 30(5)° (measured), 28° (calculated). The coexistence of monticellite, foshagite and dovyrenite points to a narrow interval of crystallization 560-630°C under subvolcanic conditions (P < 108 Pa).
Use of Demographic and Quantitative Admissions Data to Predict Performance on the National Physical Therapy Examination
Authors: Utzman Ralph R , Riddle Daniel L , Jewell Dianne V 
Published: July 2007

Background and Purpose: The purpose of this study was to determine whether admissions data could be used to estimate physical therapist student risk for failing the National Physical Therapy Examination (NPTE).
Subjects: A nationally representative sample of 20 physical therapist education programs provided data on 3,365 students.
Methods: Programs provided data regarding demographic characteristics, undergraduate grade point average (uGPA), and quantitative and verbal Graduate Record Examination scores (qGRE, vGRE). The Federation of State Boards of Physical Therapy provided NPTE data. Data were analyzed using hierarchical logistic regression.
Results: A prediction rule that included uGPA, vGRE, qGRE, and race or ethnicity was developed from the entire sample. Prediction rules for individual programs showed large variation.
Discussion and Conclusion: Undergraduate grade point average, GRE scores, and race or ethnicity can be useful for estimating student risk for failing the NPTE. Programs should use GPA and GRE scores along with other data to calculate their own estimates of student risk.
Aromaten(phosphan)metall‐Komplexe, III. Die Metall‐Basen C6H6M(PMe3)C2H3R und ihre korrespondierenden Säuren [C6H6MH(PMe3)C2H3R]+
Authors: Werner Rainer , Werner Helmut 
Published: July 2007

AbstractDie Komplexe C6H6M(PMe3)C2H3R [4: M  Ru, R  H; 5, 6: M  Os, R  H, CH3] werden durch Reduktion von [C6H6MX(PMe3)C2H3R]PF6 (1–3) mit NaC10H8 synthetisiert. Sie reagieren mit Säuren zu den Hydrido(olefin)metall‐Kationen [C6H6MH(PMe3)C2H3R]+, die als BF4‐ bzw. PF6‐Salze (7–9) isoliert werden. Für 7 (M  Ru) liegt in Lösung ein Gleichgewicht zwischen dem (Ethylen)hydrido‐ und dem Ethylmetall‐Komplex vor. Bei den Umsetzungen von 4–6 mit CH3I/NH4PF6 entstehen die Verbindungen [C6H6MCH3(PMe3)C2H3R]PF6 (10–12). Die Hydrido(olefin)‐Komplexe 7–9 reagieren mit Nal unter Insertion zu den Alkylmetall‐Verbindungen C6H6MC2H4R(PMe3)I (13, 15, 16). Die Reaktionen der Komplexe 10–12 mit NaI ergeben dagegen unter Verdrängung des Olefins die Verbindungen C6H6MCH3(PMe3)I (20, 21). Die Einwirkung von PMe3 auf die Kationen [C6H6MR′(PMe3)C2H3R]+ führt entweder zu Insertion, zu Substitution oder zu Addition des Phosphans an das koordinierte Olefin.
Polymeres (Dihydrodibenzo[b,i]‐1,4,8,11‐tetraaza‐[14]annulen)eisen(II) mit Pyrazin‐Brücken
Authors: Koch Jürgen , Hanack Michael 
Published: July 2007

Abstract5,14‐Dihydrodibenzo[b,i][1,4,8,11]tetraazacyclotetradecin (H2taa) (3) reagiert mit Eisen(II)‐acetat in Gegenwart von Pyridin über den Pyridinkomplex 4 zu Fetaa (5). Mit Pyrazin entsteht aus 5 unter verschiedenen Bedingungen nur das Pyrazin‐überbrückte Polymere 6, während das instabile Monomere 7 nicht isoliert werden kann. Gegenüber 5 zeigt das Polymere 6 mit 1·10−5 S·cm−1 eine um 107 erhöhte Dunkelleitfähigkeit bei Raumtemperatur.
Heterocyclische 8π‐Systeme, 15. Untersuchungen über Indol‐2,3‐oxide: Herstellung von 3‐Hydroxyindolinen durch intramolekulare Wittig‐Umlagerung von 1,2‐Dihydro‐4H‐3,1‐benzoxazinen
Authors: Schmidt Richard R. , Beitzke Bernhard 
Published: July 2007

AbstractBeim Versuch, durch basenkatalysierte Ringverengung der 4H‐3,1‐Benzoxazine 3 die entsprechenden Indol‐2,3‐oxide 11 abzufangen, wurden im System KNH2/NH3 fl. die 3‐Hydroxy‐3H‐indole 7 isoliert. Die aus 3 mit FSO3CH3 hergestellten N‐Methylbenzoxazinium‐Salze 15 lieferten mit Ethoxid unter kinetischer Kontrolle die cis‐konfigurierten 1,2‐Dihydro‐4H‐3,1‐benzoxazine 19 diastereospezifisch. Die Thermolyse dieser Verbindungen über Chinonimine 26 wurde untersucht. Die Einwirkung von starken Basen auf 19 führte nicht zur 1,3‐Eliminierung, sondern zu einer supra‐suprafacialen Wittig‐Umlagerung unter Bildung der trans‐konfigurierten 3‐Hydroxyindoline 27. Für den Verlauf dieser in zweifachem Sinne intramolekularen Wittig‐Umlagerung wird ein intermediäres enges Radikalpaar vorgeschlagen.
Reindarstellung, NMR‐Spektren und Kristallstruktur von Triphenylphosphonium‐cyclobutylid, (C6H5)3PC[CH2]3
Authors: Schmidbaur Hubert , Schier Annette , Neugebauer Dietmar 
Published: July 2007

AbstractDie Umsetzung von (4‐Brombutyl)triphenylphosphonium‐bromid (1) mit Natriumamid in flüssigem Ammoniak liefert die Titelverbindung 2 in kristalliner Form. Die NMR‐Parameter der salzfreien Verbindung zeigen eine deutliche Abweichung von der für spannungsfreie Phosphor‐Ylide typischen trigonal‐planaren Carbaniongeometrie an. Die Röntgenstrukturanalyse bestätigt dies für den kristallinen Zustand. Das annähernd tetraedrisch konfigurierte Oniumzentrum ragt mit einem Anstellwinkel von 19.3° aus der Ebene des anliegenden Teils des gefalteten Cyclobutanrings (16.7°) heraus. Die ylidische P‐C‐Bindung besitzt mit 166.8(3) pm noch erheblichen Mehrfachbindungscharakter.