The effect of casting and masticatory simulation on strain and misfit of implant-supported metal frameworks

Author(s)

Brilhante Bhering, Claudia Lopes ^[1] ; Vieira Marques, Isabella da Silva ^[1] ; Ferreira Koyama Takahashi, Jessica Mie ^[2] ; Ricardo Barao, Valentim Adelino ^{[1, 3]} ; Xediek Consani, Rafael Leonardo ^[1] ; Mesquita, Marcelo Ferraz ^[1]

Affiliation

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Prosthodont & Periodontol, Sao Paulo - Brazil

^[2] Amazonas State Univ, Hlth Sci Grad Sch, Dept Prosthodont, Manaus, Amazonas - Brazil

^[3] Ave Limeira 901, BR-13414903 Sao Paulo - Brazil

• Document type: Journal article
• Source: Materials Science & Engineering C-Materials for Biological Applications; v. 62, p. 746-751, MAY 1 2016.
• Web of Science Citations: 6

Abstract

The influence of casting and masticatory simulation on marginal misfit and strain in multiple implant-supported prostheses was evaluated. Three-unit screw retained fixed dental prosthesis (FDP) and screw retained full-arch fixed dental prosthesis (FAFDP) frameworks were made using calcinable or overcasted cylinders on conical dental implant abutment. Four groups were obtained according to the cylinder and prosthesis type (n = 10). Frameworks were casted in CoCr alloy and subjected to strain gauge analyses and marginal misfit measurements before and after 10(6) mechanical cycles (2 Hz/280 N). Results were submitted to ANOVA, Tukey's HSD and Pearson correlation test (alpha = 0.05). No difference was found on misfit among all groups and times (p > 0.05). Overcasted frameworks showed higher strain than the calcinable ones (FDP Initial p = 0.0047; Final p = 0.0004; FAFDP Initial p = 0.0476; Final p = 0.0115). The masticatory simulation did not influence strain (p > 0.05). No correlation was observed between strain and misfit (r = 0.24; p > 0.05). In conclusion, the marginal misfit value in the overcasted full-arch frameworks was higher than clinical acceptable data. It proved that overcasted method is not an ideal method for full-arch prosthesis. Overcasted frameworks generate higher strain upon the system. The masticatory simulation had no influence on misfit and strain of multiple prostheses. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 11/03032-5 - Biomechanical evaluation of implant supported multiple rehabilitation: comparative study of casting techniques and stress analysis methods
• Grantee: Marcelo Ferraz Mesquita
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/02841-7 - Effect of cyclic loading and casting technique over marginal fit, stress and detorque in multi-unit implant-supported prostheses
• Grantee: Cláudia Lopes Brilhante Bhering
• Support Opportunities: Scholarships in Brazil - Master