PMID: 8952624Sep 1, 1996Paper

Maximum likelihood estimates for the lifetime of bonded dental prostheses

Journal of Dental Research
W G RijkV P Thompson

Abstract

Clinical studies measuring the lifetime of dental prostheses produce censored data when not all specimens have failed during the course of the study. Such clinical data can be analyzed by the Weibull probability distribution function. Algorithms are presented that provide the maximum likelihood estimates of the distribution's parameters. These parameters are the characteristic lifetime (time to failure for 63% of the specimens of the total sample) and the Weibull or shape parameter. Two iterative methods for solving the maximum likelihood equations are given. These mathematical methods have been applied to the results from a retrospective clinical investigation into the lifetime assessment of resin-bonded prostheses. This study evaluated 164 resin-bonded prostheses (for 146 patients) placed between January, 1980, and May, 1985. To date (April, 1995), 47 prostheses (29%) have failed with a median time in service of 74 months (6.2 yr). For the surviving prostheses, the median time in service is 123 months (10.3 yr) and still increasing. The maximum likelihood estimate of the characteristic lifetime for these restorations is 255 months (21.3 yr). Differences in the characteristic lifetime were observed between prostheses placed an...Continue Reading

References

Nov 1, 1992·Journal of Dental Research·N H CreugersM A Van't Hof
Dec 1, 1994·Community Dentistry and Oral Epidemiology·N H CreugersM A van 't Hof
Oct 1, 1993·The Journal of Prosthetic Dentistry·P RammelsbergW Gernet
Jun 1, 1993·Journal of Dentistry·R J SmalesD A Webster
Aug 1, 1993·Journal of Dental Research·D B BoyerA M Diaz-Arnold

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Citations

Mar 21, 2000·Journal of Dentistry·N H CreugersR J de Kanter
Jul 28, 2013·British Dental Journal·M Miettinen, B J Millar
Jul 25, 2014·The Saudi Dental Journal·Fahim Ahmed Vohra, Muhammed Ayedh Al-Qahtani
Apr 16, 1998·Journal of Dental Research·R J De KanterM A Van't Hof
Oct 12, 2018·Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.]·Islam Abd AlraheamTerence E Donovan
Feb 23, 2021·Journal of Prosthodontic Research·Naomi TanoueShuji Ohkawa

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