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 Rehabiljournal_title
Journal of oral rehabilitationauthors
Besimo CE,Guarneri Adoi
10.1046/j.1365-2842.2003.01140.xkeywords:
subject
Has Abstractpub_date
2003-07-01 00:00:00pages
671-8issue
7eissn
0305-182Xissn
1365-2842pii
1140journal_volume
30pub_type
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