Weibull analysis of ceramic-resin bonding using two specimen testing substrates

Abstract

Objective: The objective of this study was to analyze results from microtensile bond strength test on ceramic-resin bonding in terms of reliability using Weibull analysis.

Method:

Ceramic blocks (e.max CAD®, Ivoclar Vivadent AG) were firstly treated with one of two surface treatments: (1) hydrofluoric acid (HF) (IPS Ceramic Etching gel, Ivoclar Vivadent AG) etched followed by silane (Monobond-S, Ivoclar Vivadent AG) application; (2) HF etched, silane applied, followed by heating treatment and an application of an unfilled resin (Heliobond, Ivoclar Vivadent AG). Two testing models were used according to two testing substrates: ceramic bonded to ceramic with the same surface treatment (C-C) and ceramic bonded to resin composite (C-R). Two resin cements, Variolink II® (Ivoclar Vivadent AG) and Clearfil SA Cement (Kuraray Noritake Dental Inc.), were tested. Each group (n=30) was stored in distilled water for 7 days at 37°C. They were subjected to a tensile force until failure. Mean bond strengths were reported at the IADR-APR session in 2013. The results were subsequently analyzed using Weibull statistics with R 2.12.1 software package and are now presented here.

Result:

Weibull modulii of the ceramic bonded to resin composite groups were 3.6-7.8 while modulii of ceramic bonded to ceramic groups were 5.1-9.9. Weibull parameters, including the Weibull modulus(β), the 63.2% of the samples expected to fail(η) and the 10.0% of the samples expected to fail(B10), in each ceramic bonded to ceramic group were higher compared to the corresponding group of the ceramic bonded to resin groups.

Conclusion:

Ceramic bonded to ceramic model is recommended for evaluating the microtensile bond strength of ceramic-resin cement-adhesion by providing more reliable and consistent results as demonstrated by the Weibull analysis.