Crowns and Bridges Failure: Reasons and Type of Disassembly
DOI:
https://doi.org/10.52206/jsmc.2024.14.3.902Abstract
Background: Crowns and fixed partial dentures are widely used for esthetics and function all over the world. During their service
life such prostheses fail for various reasons where a need arise for removal or disassembly.
Objectives: Objective of the study was to determine the reasons and types of crown and fixed partial denture disassembly.
Materials and Methods: This cross-sectional study was conducted at Prosthodontics Department, Peshawar Dental College, Peshawar from April 1st 2022 to September 28th 2023. A total of 140 patients including males and females, who reported to department for disassembly of their failed metal-ceramic crowns and bridges, were included in the study. Fixed prostheses already decemented and who reported for re-cementation were excluded. Before performing disassembly of prostheses data was recorded about the age, gender, service life of prosthesis, location in either arch, place of preparation and reasons for removal. At the end technique of removal was observed to categorize it as conservative, semi-conservative and destructive. Frequencies and percentages were calculated for various variables of the study.
Results: The study had 46% males (n=65) and 54% female (n=75) with a ratio of 0.85. Patients had an age ranging from 20 to 65 years (mean 44 years, SD ± 13.8 years). Failed crowns were more than bridges. Failed prostheses were found more in mandibular arch (59%, n=83) and mostly in posterior segments (74%, n=103) of arches. Majority of prostheses were porcelain fused to metal and biological failure (66%, n=93) was the main reason for prosthesis disassembly. In more than two thirds of cases prostheses were removed conservatively.
Conclusions: Carious and pulpal involvement of abutments teeth was the main reason for removal of majority of porcelain fused to metal restorations. In majority of cases disassembly was performed conservatively.
Keywords: Crown/bridge disassembly, Fixed partial dentures, Prosthesis failure, Survival of crown/ bridges
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