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Comparison of the fatigue behaviour of different dentine adhesives

: Soltész, U.; Schäfer, R.; Koplin, C.

European Federation of Conservative Dentistry -EFCD-; Deutsche Gesellschaft für Zahnerhaltung -DGZ-:
ConsEuro 2003. Book of Abstracts : München, 06.06.2003
München, 2003
ConsEuro <2003, München>
Fraunhofer IWM ()
dental; adhesive; fatigue; cyclic; quasistatic; bond; strength

The bond between the filler material and the dentine cavity wall is crucial for the integrity of a filling. Therefore, numerous attempts have been made in order to improve this bond by dentine adhesives. Failure assessments and predictions of the mechanical performance are usually based on the quasistatic strength of the bond. This is, however, probably not sufficient to assess the reliability of the bond. For its long-term behaviour the fatigue behaviour will be decisive. For that reason, the fatigue strengths of several newer, frequently used commercial adhesives were compared. The investigated materials were: Clearfill SE, ESPE P romptL-Pop, Optibond Solo Plus, Prime and Bond NT, XENO III. The testing procedure is based on the ISO shear testing set-up. Following the Wöhler procedure, pulsating cyclic loads of 4 Hz were applied at several loading levels and up to a maximum of 1 million cycles. The failure mostly occurs in the interlayer. The evaluation is performed by linear regression (least square fits) in the semi-logar ithmic plots of the data. The results show strong differences between the adhesives investigated. The strengths drastically decrease with increasing cycling number. The fatigue strength of the material with the best performance which may be deducted from the regression line e.g. at 1 million cycles, still amounts to ab out 50% of the corresponding quasistatic strength (9.0 and 18.4 MPa resp.). For the other adhesives the fatigue strength drops even more. In addition, some materials exhibit a very large scatter in their life times for a given loading level. Therefore, it will be discussed which data should be included into the regression procedure.