Document Detail

In vitro retention force changes of prefabricated attachments for overdentures.
MedLine Citation:
PMID:  12791150     Owner:  NLM     Status:  MEDLINE    
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.
C E Besimo; A Guarneri
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of oral rehabilitation     Volume:  30     ISSN:  0305-182X     ISO Abbreviation:  J Oral Rehabil     Publication Date:  2003 Jul 
Date Detail:
Created Date:  2003-06-06     Completed Date:  2003-09-04     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0433604     Medline TA:  J Oral Rehabil     Country:  England    
Other Details:
Languages:  eng     Pagination:  671-8     Citation Subset:  D; IM    
Department of Oral Medicine, Aeskulap Clinic, University of Basel, Basel, Switzerland.
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MeSH Terms
Dental Prosthesis Retention / standards*
Dental Stress Analysis / methods
Denture Precision Attachment / standards*
Denture, Overlay / standards*
Materials Testing

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