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O-ring system for retention overdenture retained for mini-implants

Grant number: 16/19915-7
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): January 01, 2017
Effective date (End): December 31, 2017
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Andréa Cândido dos Reis
Grantee:Marcos Vinicius Wada Shimano
Host Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil


The conventional dentures are still considered standard treatment for edentulism, although in many cases not be able to get the full success. The constant mandibular bone resorption edge with the tooth loss generates lack of retention and stability of the lower prosthesis, causing great discomfort to the patient, the prosthetic implant of the type overdentures can solve, in most cases, problems associated with the use of conventional prosthetic devices. Regarding the type of retention of overdentures, the o-ring system has great advantages, especially for geriatric patients, group where there is a higher prevalence of edentulism. However, the disadvantage of this type of housing is the need to periodically exchange the capsule sealing ring. The objective of the study is to evaluate a new capsule model and compare with conventional, and to evaluate the deformation of them by scanning electron microscopy (SEM). For this will be tested 40 capsules (n = 20) of two different materials: polytetrafluoroethylene (Teflon) and polyacetal; It will be inserted and removed of mini-implants with Ø 2.0 mm per 10 mm length coupled with the o-ring (MDL; Intra-Lock System, Sao Paulo, SP) by means of a machine fatigue strength and performance compared with conventional capsules. After that, the capsules will be evaluated by stereo microscope in order to verify possible deformations. Performed the analyzes proposed, the data obtained will be subjected to appropriate statistical analysis to obtain the results. (AU)

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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)
VALENTE, MARIANA L. C.; SHIMANO, MARCOS V. W.; AGNELLI, JOSE A. M.; DOS REIS, ANDREA C.. Retention force and deformation of an innovative attachment model for mini-implant-retained overdentures. JOURNAL OF PROSTHETIC DENTISTRY, v. 121, n. 1, p. 129-134, . (16/19915-7, 14/27362-2)

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