The fatigue bond strength of fixed-fixed versus cantilever resin-bonded partial fixed dental prostheses.

Abstract

STATEMENT OF PROBLEM:

Restorations using posterior resin-bonded partial fixed dental prostheses to replace missing premolar teeth were previously considered to have only variable success. Although 2-unit cantilevered resin-bonded partial fixed dental prostheses have been shown to have similar or improved clinical retention to their 3-unit counterparts, no in vitro evidence supports their use in preference to fixed-fixed designs.

PURPOSE:

The purpose of this in vitro study was to fatigue load 2 different resin-bonded partial fixed dental prosthesis designs (3-unit fixed-fixed and 2-unit cantilevered) and then compare their bond strengths after loading to failure.

MATERIAL AND METHODS:

Nickel chromium castings with cantilevered (n=10) and fixed-fixed framework designs (n=10) were bonded with a resin cement to stainless-steel tooth dies supported by a simulated periodontal ligament and subjected to cyclic loading (12 000 cycles). The abutment tooth analog was then secured in a universal testing machine, and the framework was loaded axially away from the tooth die until failure. Differences between the bond strengths of the 2 prosthesis designs were analyzed by a Mann-Whitney U test (P<.05).

RESULTS:

The bond strengths of the fixed-fixed group (332 N) were lowered by fatigue loading but not the cantilevered group (421 N) (P<.05).

CONCLUSIONS:

Three-unit fixed-fixed resin-bonded partial fixed dental prostheses were found to have a lower bond strength than 2-unit cantilevered resin-bonded partial fixed dental prostheses when fatigue loaded.

• Authors: Tsz Leung Wong, Michael George Botelho
• Journal: The Journal of prosthetic dentistry (J Prosthet Dent) Vol. 111 Issue 2 Pg. 136-41 (Feb 2014) ISSN: 1097-6841 [Electronic] United States
• PMID: 24189114 (Publication Type: Journal Article)
• Copyright: Copyright © 2014 Editorial Council for the Journal of Prosthetic Dentistry. Published by Mosby, Inc. All rights reserved.

Chemical References

• Chromium Alloys
• Resin Cements
• Water
• Aluminum Oxide

Topics

• Aluminum Oxide (chemistry)
• Bicuspid
• Chromium Alloys (chemistry)
• Dental Abutments
• Dental Bonding
• Dental Etching (methods)
• Dental Stress Analysis (instrumentation)
• Denture Design
• Denture Retention
• Denture, Partial, Fixed
• Denture, Partial, Fixed, Resin-Bonded
• Humans
• Materials Testing
• Resin Cements (chemistry)
• Shear Strength
• Stress, Mechanical
• Temperature
• Tensile Strength
• Water (chemistry)