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Type: Artigo de periódico
Title: Retention force and fatigue strength of overdenture attachment systems
Author: Botega, DM
Mesquita, MF
Henriques, GEP
Vaz, LG
Abstract: This study evaluated retention force and fatigue resistance of two overdenture attachment systems. Twenty samples (O-ring and Bar-Clip) from two manufacturers (Conexao Sistemas de Protese and Lifecore Biomedical) were prepared and divided into four groups: (i) Conexao/O-ring; (ii) Conexao/Bar-Clip; (iii) Lifecore/O-ring and (iv) Lifecore/Bar-Clip, with five samples in each group. They were submitted to mechanical fatigue test using a servohydraulic machine performing 5500 cycles of insertion and removal (f=0.8 Hz), immersed in artificial saliva. Retention force values were obtained three times (0, 3000 and after 5500 cycles) simulating the clinical service, using a tensile strength at 1 mm min(-1) and load cell of 1 kN. Data were analysed with analysis of variance and Tukey's test at 5% level. Results showed that Conexao/Bar-Clip specimens had significantly higher retention values than Lifecore/Bar-Clip (44.61 and 18.44 N, respectively), Conexao/O-ring specimens had significantly lower values than Lifecore/O-ring (13.91 and 19.75 N, respectively). Conexao/Bar-Clip values were always significantly higher than those of Conexao/O-ring group (44.61 and 13.91 N, respectively). Lifecore (O-ring and Bar-Clip) presented similar values (19.75 and 18.44 N, respectively). The systems evaluated showed satisfactory retention force values, before and after fatigue testing. Conexao/Bar-Clip specimens presented the highest values. A 5-year simulation of insertion and removal did not decrease retention values or fracture components.
Subject: overdentures
osseointegrated implants
mechanical properties
fatigue strength
Country: Inglaterra
Editor: Blackwell Publishing Ltd
Citation: Journal Of Oral Rehabilitation. Blackwell Publishing Ltd, v. 31, n. 9, n. 884, n. 889, 2004.
Rights: fechado
Identifier DOI: 10.1111/j.1365-2842.2004.01308.x
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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