Document Detail

Effectiveness of metal surface treatments in controlling microleakage of the acrylic resin-metal framework interface.
MedLine Citation:
PMID:  11125348     Owner:  NLM     Status:  MEDLINE    
STATEMENT OF PROBLEM: Microleakage at the junction between the metal alloy and acrylic resin in a removable partial denture may result in discoloration, fluid percolation, and acrylic resin deterioration. The junction between a metal alloy and acrylic resin is an area of clinical concern. Failure of a removable partial denture may be linked to this interface. Enhancing resistance to microleakage at this interface may improve the long-term union between the 2 materials. PURPOSE: This investigation was designed to determine the effects of various metal surface treatment protocols on microleakage and bond strength between the metal alloy and acrylic resin used in the fabrication of a removable partial denture. MATERIAL AND METHODS: Ninety-six nickel-chromium-beryllium alloy specimens were randomly divided into 8 groups. After adaptation of baseplate wax, each specimen was invested. Subsequent to wax removal, each specimen was divided into a control half and an experimental half. Air abrasion, tinplating/oxidation, and silanation were evaluated individually and in all combinations. Heat-polymerized acrylic resin was processed against all specimens before storage in distilled water at 37 degrees C for 72 hours. Each specimen then was thermocycled in distilled water (3000 cycles) before immersion in sodium fluorescein dye for 24 hours. Counting grids that exhibited dye penetration under ultraviolet light exposure allowed assessment of microleakage. RESULTS: Air abrasion resulted in a significant decrease in microleakage when used individually and in all combinations (P<0.05). All experimental combinations that did not involve air abrasion demonstrated no significant reduction in measured microleakage between the experimental and control sides. Tukey's pair-wise comparison of the difference in the mean number of squares exhibiting microleakage between the control and treated sites for each experimental group revealed a significant difference, based on the involvement of air abrasion. Groups involving air abrasion did not differ significantly from each other (P<0.05). In addition, no significant difference was detected between groups not involving air abrasion (P<0.05). CONCLUSION: Air abrasion, alone and in combination with tinplating/oxidation and with silanation, resulted in a significant reduction in microleakage between the metal alloy and acrylic resin.
B Sharp; D Morton; A E Clark
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of prosthetic dentistry     Volume:  84     ISSN:  0022-3913     ISO Abbreviation:  J Prosthet Dent     Publication Date:  2000 Dec 
Date Detail:
Created Date:  2001-02-02     Completed Date:  2001-02-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376364     Medline TA:  J Prosthet Dent     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  617-22     Citation Subset:  D; IM    
College of Dentistry, University of Florida, Gainesville 32610-0435, USA.
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MeSH Terms
Acrylic Resins / chemistry*
Air Abrasion, Dental* / methods,  statistics & numerical data
Analysis of Variance
Dental Alloys / chemistry*
Dental Leakage / prevention & control*
Denture Design / methods*,  statistics & numerical data
Denture, Partial, Removable*
Random Allocation
Silanes / chemistry*
Surface Properties
Tin / chemistry*
Reg. No./Substance:
0/Acrylic Resins; 0/Dental Alloys; 0/Silanes; 7440-31-5/Tin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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