Effect of crown-to-implant ratio on peri-implant stress: A finite element analysis

Autor(es)

Verri, Fellippo Ramos ; de Souza Batista, Victor Eduardo ; Santiago, Jr., Joel Ferreira ; de Faria Almeida, Daniel Augusto ; Pellizzer, Eduardo Piza

• Tipo de documento: Artigo Científico
• Fonte: Materials Science & Engineering C-Materials for Biological Applications; v. 45, p. 234-240, DEC 1 2014.
• Citações Web of Science: 20

Resumo

The aim of this study was to evaluate stress distribution in the fixation screws and bone tissue around implants in single-implant supported prostheses with crowns of different heights (10,12.5, 15 mm crown-to-implant ratio 1:1, 1.25:1, 1.5:1, respectively). It was designed using three 3-Dmodels. Each model was developed with a mandibular segment of bone block including an internal hexagon implant supporting a screw-retained, single metalceramic crown. The crown height was set at 10, 12.5, and 15 mm with crown-to-implant ratio of 1:1, 1.25:1, 1.5:1, respectively. The applied forces were 200 N (axial) and 100 N (oblique). The increase of crown height showed differences with the oblique load in some situations. By von Mises' criterion, a high stress area was concentrated at the implant/fixation screw and abutment/implant interfaces at crown-to-implant ratio of 1:1, 1.25:1, 1.5:1, respectively. Using the maxiinum principal criteria, the buccal regions showed higher traction stress intensity, whereas the distal regions showed the largest compressive stress in all models. The increase of C/I ratio must be carefully evaluated by the dentist since the increase of this C/I ratio is proportional to the increase of average stress for both screw fixation (C/I 1:1 to 1:1.25 ratio = 30.1% and C/I 1:1 to 1 :1.5 ratio = 46.3%) and bone tissue (C/I 1:1 to 1:1.25 ratio = 30% and C/I 1:1 to 1:1.5 ratio = 51.5%). (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/06075-7 - Avaliação das tensões em próteses unitárias sobre implante com diferentes alturas de coroas. Estudo pelo método dos elementos finitos tridimensionais.
• Beneficiário: Rafael Gonçalves Mazini
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica