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Analysis of Debond Rates of Resin-bonded Prostheses

Department of Operative Dentistry

V.D. Williams

Department of Family Dentistry

K.E. Thayer

Department of Prosthodontics, College of Dentistry, University of Iowa, Iowa City, Iowa 52242

G.E. Denehy

Department of Operative Dentistry

A.M. Diaz-Arnold

Department of Family Dentistry

Debonding rates of 164 resin-bonded prostheses (RBP) placed from 1974 to 1985 were examined at recall. The yearly debond rates were calculated, the cumulative probability of failure was determined for the debonded RBPs, and Weibull distribution parameters were determined. For perforated prostheses, there was a high initial debond rate, followed by slowly decreasing rates for about 5 years. Increasing rates after 5 years indicated the beginning of wearout. The Weibull parameters for the wearout period ofthe perforated prostheses were: characteristic life = 128 (SE = 2) months, modulus = 1.27 (0.06), and threshold parameter = 0. Data were available for etched frameworks for 6 years and showed decreasing debond rates during this time. The characteristic life of the etched bridges was 318 (84) months. The cumulative failure data were also modeled with a cubic polynomial distribution that resulted in a U-shaped hazard function.

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Journal of Dental Research, Vol. 72, No. 8, 1244-1248 (1993)
DOI: 10.1177/00220345930720081401


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