Approach for valuating the significance of laboratory simulation.

Abstract:

OBJECTIVE:The aim of this investigation was to compare the clinical survival rate of all-ceramic FPDs with failures during in vitro simulation. METHODS:40 anterior FPDs were manufactured from lithiumdisilicate ceramic and alumina-oxide ceramic. The FPDs were adhesively bonded to human teeth and artificially aged to investigate the survival rate during thermal cycling and mechanical loading (TCML(1); 3.6 Mio*50 N ML). Survival rates were compared to available clinical data, and the TCML parameter 'mastication force' was adapted accordingly for a second TCML run (TCML(2); 3.6 Mio*25 N/35 N ML). The fracture resistance of the FPDs that survived TCML was determined. Data were statistically analysed by means of Mann-Whitney U-test, and survival rates were determined by curve fitting/regression analysis. RESULTS:TCML decreased survival rates by 30-50%, depending on the type of material used. Failures during TCML included cracking, chipping or fracture. Increased masticatory loading during TCML caused a higher decrease in the fracture resistance of FPDs. Fracture results were 403 N (278/453) and 426 N (317/538) for Empress 2 and 325 N (164/584) and 405 N (344/558 N) for Inceram. CONCLUSIONS:Despite the limitations of this study, the results indicate that TCML with 1,200,000*25/35 N provide a sufficient prognosis of probable clinical failures. Longer TCML-time with higher mastication forces may help to exclude catastrophic clinical failures.

journal_name

J Dent

journal_title

Journal of dentistry

authors

Rosentritt M,Siavikis G,Behr M,Kolbeck C,Handel G

doi

10.1016/j.jdent.2008.09.001

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

1048-53

issue

12

eissn

0300-5712

issn

1879-176X

pii

S0300-5712(08)00254-6

journal_volume

36

pub_type

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