RESUMO

A resistência de união entre porcelana de cobertura e uma infraestrutura cerâmica determina a longevidade desse tipo de restauração no meio bucal. O propósito do atual trabalho é verificar a resistência da união entre duas infraestruturas de zircônia e dois tipos de porcelana de cobertura. Foram confeccionados 20 corpos de prova em infraestrutura de zircônia, Ceramill e Lava Frame. As porcelanas de cobertura foram aplicadas por condensação e estratificação e divididas em 04 grupos experimentais: G-1 Lava Frame/Vita VM9 (n=5); G-2 Lava Frame/e-Max Ceram (n=5); G-3 Ceramill ZI/Vita VM9 (n=5) e G-4 Ceramill ZI/e-Max Ceram (n=5). Os corpos de prova foram submetidos ao ensaio de cisalhamento em máquina de ensaio universal e os resultados submetidos à análise de variância (ANOVA) a dois critérios. Os experimentos mostraram valores médios de força de cisalhamento de 792,52N para o G-1, e para o G-2 de 741,95N. Nos Grupos 3 e 4, os valores encontrados foram 757,19N e 745,03N, respectivamente. Os resultados não apresentaram diferenças estatisticamente significantes para os grupos experimentais. Os fatores tipo de cerâmica e o tipo de porcelana de cobertura não exerceram influência na resistência de união (AU).

The bond strength between lining porcelain and a ceramic framework determines the longevity of this type of restoration in the oral medium. The purpose of the present study was to verify the bond strength between two zirconia frameworks and two types of liner porcelains. A total of 20 test specimens of zirconia frameworks made of Ceramill ZI (n=10) and Lava Frame (n=10) were manufactured. The liner porcelains were applied by condensation and stratification, and were divided into 4 experimental groups: G-1 Lava Frame/Vita VM9 (n=5); G-2 Lava Frame/e-Max Ceram; G-3 Ceramill ZI/Vita VM9; and G-4 Ceramill ZI/e-Max Ceram. The test specimens were submitted to shear bond strength testing in a universal test machine, and the results were submitted to two-way analysis of variance (ANOVA). The experiments showed mean shear bond strength values of 792.52N for G-1; and 741.95N for G-2. In Groups 3 and 4, the values found were 757.19 and 745.03 N, respectively. The results obtained showed no statistically significant differences for the experimental groups. The factors type of ceramic and type of liner porcelain had no influence on the shear bond strength (AU).

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RESUMO

The orbiniid polychaetes chiefly from Antarctic and subantarctic seas and off South America are described based on collections of the National Museum of Natural History and new material from surveys conducted by the United States Antarctic Program and other federal and privately funded sources as well as participation in international programs. A total of 44 species of Orbiniidae distributed in 10 genera are reported from the Pacific Ocean and waters off South America and Antarctica. Twenty-one species are new to science; one species is renamed. Berkeleyia heroae n. sp., B. abyssala n. sp., B. weddellia n. sp.; B. hadala n. sp., Leitoscoloplos simplex n. sp., L. plataensis n. sp., L. nasus n. sp., L. eltaninae n. sp., L. phyllobranchus n. sp., L. rankini n. sp., Scoloplos bathytatus n. sp., S. suroestense n. sp., Leodamas hyphalos n. sp., L. maciolekae n. sp., L. perissobranchiatus n. sp., Califia bilamellata n. sp., Orbinia orensanzi n. sp., Naineris antarctica n. sp., N. argentiniensis n. sp., Orbiniella spinosa n. sp., and O. landrumae n. sp. are new to science. A new name, Naineris furcillata, replaces N. chilensis Carrasco, 1977, a junior homonym of N. dendtritica chilensis Hartmann­Schröder, 1965, which is raised to full species status. Leodamas cochleatus (Ehlers, 1900) is removed from synonymy and redescribed. A neotype is established for Leodamas verax Kinberg, 1966, the type species. A general overview of Leodamas species is provided. The Leitoscoloplos kerguelensis (McIntosh, 1885) complex is reviewed and partially revised. Definitions of the genera of the Orbiniidae are updated to conform to recently described taxa. Several new synonymies are proposed following a reexamination of previously described type specimens. The morphological characters used to identify and classify orbiniids are reviewed. The biogeographic and bathymetric distributions of the South American and Southern Ocean orbiniid fauna are reviewed.

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Introducción y Objetivo: La cirugía maxilofacial se ocupa de la prevención, estudio, diagnóstico, tratamiento quirúrgico y medicamentoso de las patologías que afectan la cavidad bucal y la cara, así como las estructuras cervicales relacionadas. El presente trabajo se orienta a evaluar las principales causas por las que se realiza cirugía maxilofacial, los diferentes tipos de patologías, la edad, el género, los días de estancia y las complicaciones que se presentaron en los pacientes de cirugía maxilofacial de la clínica CES. Materiales y Métodos: Se realizó un estudio descriptivo, transversal, retrospectivo basado en la información tomada de historias clínicas de 648 pacientes intervenidos por cirugía maxilofacial en la clínica CES entre los años 2005 a 2007. Resultados: El tipo de atención que más se presentó fue particular 52.6%, el tipo de cirugía más frecuente fue electiva 90%, las causas más comunes de los traumas fueron accidentes de tránsito y lesiones por caídas, la localización más frecuente de las fracturas fue el tercio inferior y la zona más afectada fue el ángulo mandibular, el procedimiento quirúrgico que predominó fue la cirugía ortognática 55%, requirieron fijación intermaxilar el 30.7%. El 50% de los pacientes fueron hospitalizados y el 0.92% presentó alguna complicación. Conclusiones: La mayoría de las cirugías realizadas fueron electivas, particulares y ortognáticas, predominando la población adulta joven de sexo femenino, la causa principal de los traumas fueron accidentes de tránsito y lesiones por caídas, la mitad de los pacientes requirió hospitalización y el promedio fue un día.

Introduction and Objective: Maxillofacial surgery deals with the prevention, study, diagnosis and surgical treatment of disorders affecting the oral cavity and face, neck and related structures. The purpose was to assess the main causes for the performance of that surgery, different types of diseases, age, gender, days of hospitalization, and complications that were presented at the CES clinic in the area of maxillofacial surgery. Materials and Methods: A descriptive, cross-sectional, retrospective study was performed. The information for analysis was taken from medical records of 648 patients operated by maxillofacial surgery at the CES clinic between 2005 and 2007. Results: The type of treatment most prevalent was private 52.6%, the most common surgery was elective 90%, the most common causes of trauma were from traffic accidents and injuries from falls; the most common site of fractures were the facial lower third and the most affected area was the mandibular angle, the predominant surgical procedure was orthognathic surgery 55%, requiring intermaxillar fixation 30.7%. The 50% of patients were hospitalized and only 0.92% had a complication. Conclusions: The majority of surgeries performed were elective, private and orthognathic, mainly of young female adults, the main cause of trauma were traffic accidents and injuries from falls, half of the patients required hospitalization with one day of average.

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