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Influence of angulation and height of tooth preparation on the distribution of tensions in prosthetic crowns for upper central incisor: in silico analysis
Machado, Marcos Teixeira; Rendohl, Edelcio de Souza; Olivieri, Karina Andrea Novaes; Miranda, Milton Edson; Brandt, William Cunha.
Afiliação
  • Machado, Marcos Teixeira; Faculdade São Leopoldo Mandic. School of Dentistry. Campinas. BR
  • Rendohl, Edelcio de Souza; Universidade Santo Amaro. School of Dentistry. Department of Implantology. Campinas. BR
  • Olivieri, Karina Andrea Novaes; Faculdade São Leopoldo Mandic. School of Dentistry. Campinas. BR
  • Miranda, Milton Edson; Faculdade São Leopoldo Mandic. School of Dentistry. Campinas. BR
  • Brandt, William Cunha; Universidade Santo Amaro. School of Dentistry. Department of Implantology. Campinas. BR
Braz. j. oral sci ; 18: e191620, jan.-dez. 2019. ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1095173
Biblioteca responsável: BR218.1
ABSTRACT

Aim:

it was to use tridimensional finite element analysis (FEA) to analyze the effect of height and angulation of prosthetic preparations on the distribution of stresses for lithium disilicate prosthetic crowns, the underlying resin cement, and the prosthetic preparation of a superior central incisor.

Methods:

a CAD modeling software, SolidWorks 2013, was used to generate three-dimensional virtual models comprising the dimensions of the preparation parameters. Three angles (6, 12 and 16 degrees) were simulated on the prepared walls and two wall heights were utilized (4 and 5 mm), for a total of six model groups according to the height and angulation of the walls. A vertical line in the Y-axis was used as a reference for determining the degrees of convergence (inclination of the preparations). The chamfer finish and preparation width were standardized for all groups.

Results:

the 4 mm preparations behaved more appropriately when the axial wall convergence was approximately 6 degrees. The 5 mm preparations required 12 degrees of angulation. In relation to resin cement, there was better stress distribution when the angle of incisal convergence was between 6 and 12 degrees. An increase to 16 degrees led to a considerable increase in peak stress at the preparation margin.

Conclusion:

it was concluded that the convergence of the axial walls of coronal preparations with 4 and 5 mm heights should be 6 and 12 degrees, respectively, to avoid high tension spikes in the underlying resin cement
Assuntos


Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: BBO - Odontologia / LILACS Assunto principal: Prótese Dentária / Preparo do Dente / Análise de Elementos Finitos / Incisivo Idioma: Inglês Revista: Braz. j. oral sci Assunto da revista: Odontologia Ano de publicação: 2019 Tipo de documento: Artigo País de afiliação: Brasil Instituição/País de afiliação: Faculdade São Leopoldo Mandic/BR / Universidade Santo Amaro/BR

Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: BBO - Odontologia / LILACS Assunto principal: Prótese Dentária / Preparo do Dente / Análise de Elementos Finitos / Incisivo Idioma: Inglês Revista: Braz. j. oral sci Assunto da revista: Odontologia Ano de publicação: 2019 Tipo de documento: Artigo País de afiliação: Brasil Instituição/País de afiliação: Faculdade São Leopoldo Mandic/BR / Universidade Santo Amaro/BR
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