International Journal of Prosthodontics and Restorative Dentistry

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VOLUME 1 , ISSUE 3 ( October-December, 2011 ) > List of Articles

RESEARCH ARTICLE

Comparison between Acetal Resin and Cobalt-chromium Removable Partial Denture Clasps: Effect on Abutment Teeth Supporting Structures

Tarek Mohamed, Osama Abdulmoneam Baraka, Magdy Mostafa Badawy

Citation Information : Mohamed T, Baraka OA, Badawy MM. Comparison between Acetal Resin and Cobalt-chromium Removable Partial Denture Clasps: Effect on Abutment Teeth Supporting Structures. Int J Prosthodont Restor Dent 2011; 1 (3):147-154.

DOI: 10.5005/jp-journals-10019-1028

Published Online: 01-03-2014

Copyright Statement:  Copyright © 2011; The Author(s).


Abstract

Statement of problem

Acetal resin has been introduced as an esthetic partial denture clasp material. However, the effects of these clasps on the abutment teeth supporting structures were not clear.

Purpose

To evaluate the effects of acetal resin clasps on the abutment teeth supporting structures as compared to cobalt-chromium clasps.

Materials and methods

Twenty patients, 12 males and 8 females, with Kennedy class III modification I partially edentulous maxilla and dentulous mandibles were selected for this study. Patients were divided into two equal groups; group 1 received maxillary cobalt-chromium partial denture frameworks with acetal resin Akers clasps. Group 2 received maxillary partial denture with cobalt-chromium frameworks and Akers cobalt-chromium clasps. Crevicular fluid, epithelial attachment loss, and bone height and density of the abutment teeth were evaluated at partial denture insertion and after 6 and 12 months. Paired t-test was used at p ≤ 0.05 to assess the changes in the above parameters in each group. Student t-test was used to compare between the two groups.

Results

Crevicular fluid measurements were significantly higher in the first group than that in the second group. There were no differences in epithelial attachment loss between the two groups. There were significantly higher reductions in the bone height and in the bone density in the second group than that in the first group.

Conclusion

Acetal resin clasps were superior to cobalt-chromium clasps as produced fewer reductions in bone height and in bone density around the abutment teeth inspite of produced increase in the crevicular fluid.

Clinical implications

Since there were lesser reductions in bone height and in bone density around acetal resin clasp abutments, it could be used successfully to retain partial dentures. However, meticulous oral hygiene and proper insertion and removal of partial denture with acetal resin clasps were required to decrease gingival inflammation and crevicular fluid amount.


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