|Support type:||Scholarships in Brazil - Doctorate|
|Effective date (Start):||May 01, 2008|
|Effective date (End):||November 30, 2010|
|Field of knowledge:||Health Sciences - Dentistry - Dental Clinics|
|Principal Investigator:||Ricardo Faria Ribeiro|
|Home Institution:||Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil|
Several restoration options exist when multiple implants are closely positioned. Due to the difficulty in producing multiple structures that passively fit, some authors suggest that adjacent implants are restored by single crown, minimizing the effects of the tensions generated to the implants. Small movements of the fastened implant and excessive tensions in the interface bone-implant suggest to be the causes of the peri-implant bone resorption and consequent flaw of the treatment. This biological answer of the bone to the mechanical loads generated to the implant affects its longevity, and the generation of these loads are under direct influence of factors as the type of restorative material, number, distribution and position of the implants, and occlusion. The photoelastic analysis is an experimental technique for analysis of tensions, plenty maid due to his/her relative simplicity and reliability as for the clinical correspondence of the observed discoveries. Consensus doesn't exist in the literature as for the best prosthetic planning for partial rehabilitations with multiples adjacent implants, in order to minimize the tensions generated in the interface bone-implant. This work intends to evaluate the tensions produced in the interface bone-implant, with the application of centrical static loads on the structures varying the types of implant-supported prostheses, and analyzing them by photoelastic method. The type of prosthesis that will be appraised include isolated and united multiple prostheses, screwed in, with and without the presence of element dental distal to the implants and still with the variation of the type of aesthetic material, ceramic and resin, used in the covering of the structures.