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Coroas em zircónio: biomecânica do preparo
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Abstract(s)
O objetivo de esta revisão bibliográfica é perceber quais são as características que um preparo dentário deve ter para cumprir a os seus objetivos de retenção, resistência ao deslocamento e suporte mecânico de uma coroa em zircónio, abordando também o conceito da biomecânica (quais são os pontos de maior stress estrutural) do preparo e de como a linha de acabamento pode ou não influenciar a resistência de uma coroa.
A bibliográfica utilizada teve por base uma pesquisa realizada em plataformas como PubMed, B-on, Google Scholar. Tendo sido encontrados 53 artigos e selecionados 24 pelos critérios: test in vitro, ano de publicação e o material utilizado no estudo deveria ser o zircónio.
Pode-se concluir que as caraterísticas de um preparo que devem possuir são: convergência oclusal entre os 10°e 20°, dimensão ocluso-cervical mínima de 3mm, morfologia circunferencial dependente do dente preparado podendo ser oval ou retangular, a linha de acabamento pode variar consoante a filosofia clínica do clínico e a resistência a fratura. Foi possível também demonstrar que a linha de acabamento pode influenciar a resistência de uma coroa em zircónio.
The purpose of this bibliographic review is to understand what are the features that a dental preparation must have to fulfill its goals of retention, resistance to displacement and mechanical support of a zirconium crown, also addressing the concept of biomechanics of the preparation (what are the points of greater structural stress) and how the finish line may or may not influence the strength of a crown. The bibliography used was based on reasearch carried out on platforms such as PubMed, B-on and Google Scholar. Having found 53 articles and selected 24 according to the criteria: in vitro test, year of publication and the material used in the study should be zirconium. It can be concluded that the characteristics of a preparation which should possess are: occlusal convergence between 10° and 20°, occlusal-cervical dimension minimum of 3 mm, circumferential morphology depending on the prepared tooth, which can be oval or rectangular, the finishing line can vary according to the clinician's clinical philosophy and fracture resistance. It has also been shown that the finish line can influence the strength of a zirconium crown.
The purpose of this bibliographic review is to understand what are the features that a dental preparation must have to fulfill its goals of retention, resistance to displacement and mechanical support of a zirconium crown, also addressing the concept of biomechanics of the preparation (what are the points of greater structural stress) and how the finish line may or may not influence the strength of a crown. The bibliography used was based on reasearch carried out on platforms such as PubMed, B-on and Google Scholar. Having found 53 articles and selected 24 according to the criteria: in vitro test, year of publication and the material used in the study should be zirconium. It can be concluded that the characteristics of a preparation which should possess are: occlusal convergence between 10° and 20°, occlusal-cervical dimension minimum of 3 mm, circumferential morphology depending on the prepared tooth, which can be oval or rectangular, the finishing line can vary according to the clinician's clinical philosophy and fracture resistance. It has also been shown that the finish line can influence the strength of a zirconium crown.
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Keywords
Prótese fixa Zirconia Preparo dentário Biocompatibilidade Biomecânica de coroa Linha de acabamento Fixed prosthesis Zirconia Dental preparation Biocompatibility Crown biomechanics Finishing line