In vitro retention force changes of prefabricated attachments for overdentures.

Abstract:

:Changes in the retention force of six prefabricated spherical and cylindrical attachments were examined in vitro under continuous loading. The testing machine permitted insertion-separation cycles to be tested under reproducible conditions while a calibrated measuring device determined the insertion and retention forces. At the beginning, during the so-called run-in period, all anchoring elements showed a very unstable behaviour characterized by a varying marked increase and subsequent decrease in the retention force. During the ensuing functional period, the retention force followed a more stable course. In this phase, the frictional attachments having lamellae for activation proved more stable than did the spring-loaded retention attachments. Furthermore, in two of five cylindrical anchors by Gerber, the spring broke. This provides support to the concept that prefabricated attachments should be constructed as robust elements composed of as few individual parts as possible. This would help to ensure that service and repairs remain at a minimum. Frictional attachments with lamellae for activation are to be preferred for use in matrices and patrices over attachments having spring-loaded retention.

journal_name

J Oral Rehabil

authors

Besimo CE,Guarneri A

doi

10.1046/j.1365-2842.2003.01140.x

keywords:

subject

Has Abstract

pub_date

2003-07-01 00:00:00

pages

671-8

issue

7

eissn

0305-182X

issn

1365-2842

pii

1140

journal_volume

30

pub_type

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