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Estimating long-term survival of densely sintered alumina crowns: A cohort study over 10 years.
MedLine Citation:
PMID:  21723990     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
STATEMENT OF PROBLEM: Alumina-core crowns have become a standard treatment option in contemporary dental practice. The short-term survival of alumina crowns has been well documented. However, there is still a paucity of long-term survival data.
PURPOSE: The purpose of this prospective cohort study was to estimate long-term survival of alumina crowns in anterior and posterior areas over an observation period of up to 10 years.
MATERIAL AND METHODS: Between 1997 and 2005, 155 alumina crowns were placed in 50 subjects. Clinical and technical parameters were assessed at baseline. In 2005 and 2008, the crowns were clinically assessed using modified U.S. Public Health Service (USPHS) guidelines. Treatment failure was defined as crown or tooth loss and separated into technical or biological failures. Survival probabilities were estimated using the Kaplan-Meier method.
RESULTS: In 2008, 29 subjects with 112 alumina crowns, including 86 (77%) posterior and 26 (23%) anterior crowns, were available for clinical assessment. The average observation period for these subjects was 7.8 years, with a range from 3 to 10.7 years. In total, 3 technical and 8 biological failures were observed. The estimated survival probability considering technical failures only was 95% (95% Confidence Interval (CI), 89% to 100%). The estimated overall survival probability after 10 years was 84% (95% CI, 74% to 95%). There was no significant difference in treatment failures in posterior as compared to anterior crowns (all failures: P=.713; technical failures: P=.352).
CONCLUSIONS: The results suggest that the expected 10-year survival rate of alumina crowns due to technical failures is 95% (95% CI, 89% to 100%).
Authors:
Martha L Galindo; Pedram Sendi; Carlo P Marinello
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of prosthetic dentistry     Volume:  106     ISSN:  1097-6841     ISO Abbreviation:  J Prosthet Dent     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-07-04     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376364     Medline TA:  J Prosthet Dent     Country:  United States    
Other Details:
Languages:  eng     Pagination:  23-8     Citation Subset:  D; IM    
Copyright Information:
Copyright © 2011 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Mosby, Inc. All rights reserved.
Affiliation:
Assistant Professor, Clinic for Fixed and Removable Prosthodontics and Temporomandibular Disorders, University of Basel School of Dentistry, Basel, Switzerland.
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