Evaluation of misfit and strain distribution in implant-supported partial prostheses: effects of prosthetic cylinder and different lengths of implants

• Grant number: 14/19264-0
• Support Opportunities: Scholarships in Brazil - Master
• Start date: January 01, 2015
• End date: February 29, 2016
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Valentim Adelino Ricardo Barão
• Grantee: Anna Gabriella Camacho Presotto
• Host Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil

Abstract

The longevity of treatment with implant-supported prostheses in totally or partially edentulous patients has been confirmed in several studies, and the steps involved in the treatment influence it. Compared to conventional casting techniques, overcasted cylinders were developed to promote better adaptation of prosthetic framework after casting. In contrast, the CAD / CAM technology has been widely used and some studies suggest its superiority over conventional casting techniques. Moreover, the use of short implants for the rehabilitation of posterior maxillary bone with insufficient height appears to be a more viable approach to treatment when compared to techniques which bone graft associated with conventional implants, and studies suggest that have similar clinical success the longer implants. Thus, the aim of this study is to compare the vertical misfit and the strain distribution in frameworks of fixed partial denture (fabricated by conventional laboratory techniques (overcasting process) in relation to the process made by CAD / CAM, as well as influence of the length of the implant in the strain distribution. For this, will be made 20 three-element fixed partial denture framework supported by two implants through the overcasting system and CAD/CAM (n=10) process, using two types of implant length - short (4,1mmx6mm) and Branemark standard (4.1mmx11mm). After fabrication of the photoelastic models for both clinical situations will be tested marginal misfits between the intermediate pillars (mini abutments) and cylinders of prosthetic framework by single screw test (Sartori et al., 2004). Next, the strain distribution will be evaluated qualitatively and quantitatively by photoelastic analysis after fixation of prosthetic framework to intermediate pillars and after application of compressive load (280N). The data obtained from the groups will be tabulated, analyzed and compared by statistical methods considering the 5% level of significance. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

CAMACHO PRESOTTO, ANNA GABRIELLA; BRILHANTE BHERING, CLAUDIA LOPES; MESQUITA, MARCELO FERRAZ; RICARDO BARAO, VALENTIM ADELINO. Marginal fit and photoelastic stress analysis of CAD-CAM and overcast 3-unit implant-supported frameworks. JOURNAL OF PROSTHETIC DENTISTRY, v. 117, n. 3, p. 373-379, MAR 2017. (14/19264-0)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

PRESOTTO, Anna Gabriella Camacho. Evaluation of marginal misfit and stress in 3-unit implant-supported prostheses: the role of prosthetic framework and implant design. 2016. Master's Dissertation - Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba Piracicaba, SP.