Evaluation of the durability of O'ring Overdenture system subjected to daily hygiene solutions

• Grant number: 11/20830-2
• Support Opportunities: Regular Research Grants
• Start date: July 01, 2012
• End date: June 30, 2014
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Valéria Oliveira Pagnano de Souza
• Grantee: Valéria Oliveira Pagnano de Souza
• Host Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
• Associated researchers: Daniela Nair Borges Felipucci ; Helena de Freitas Oliveira Paranhos ; Luciana Costa Crizóstomo ; Osvaldo Luiz Bezzon ; Raphael Freitas de Souza

Abstract

In view of the need of an efficient protocol for dentures cleaning and natural wear of o-rings systems due the constant friction on the abutment, which is widely discussed in the literature and the need to emphasize the use of cleaning solutions for the prostheses, this study aims to assess whether these solutions leverage the wear already expected for this cases. The project will be composed of two stages: static and dynamic. The effects of solutions will be evaluated: cetylpyridinium chloride (Cepacol), essential oils (Listerine), fluoride cetylpyridinium chloride (Cepacol Flúor), sodium hypochlorite 0.05%, deionized water and not sink the o'rings (Conexão Sistemas de Prótese). A teflon mould containing two analogues with o-ring abutments will be obtained and another acrylic resin part containing o-rings capsules that will be randomizing distributed in each experimental group (n = 6). This study will simulate 180-days of immersion. In the first stage, after every 30 overnight immersions, the tensile test will be performed using a mechanical testing machine (Material Testing System - MTS 810). In the second stage, the test should be performed in the same way, however there will be added one hundred and twenty cycles of insertion / removal of all capsule-pillar (simulating 30 days of use) in each time. A sample of each group will be subjected to qualitative analysis by scanning electron microscopy. The results will be tested for homogeneity and adherence to the normal curve, and the most appropriate statistical analysis will be indicated, with significance level of 5%. (AU)