Effect of phosphoric acid preetching on fatigue limits of selfetching adhesives

T. Takamizawa, W. W. Barkmeier, A. Tsujimoto, D. D. Scheidel, R. L. Erickson, M. A. Latta, M. Miyazaki

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25 Scopus citations

Abstract

The purpose of this study was to use shear bond strength (SBS) and shear fatigue limit (SFL) testing to determine the effect of phosphoric acid pre-etching of enamel and dentin prior to application of self-etch adhesives for bonding resin composite to these substrates. Three selfetch adhesives-1) G- ænial Bond (GC Corporation, Tokyo, Japan); 2) OptiBond XTR (Kerr Corp, Orange, CA, USA); and 3) Scotchbond Universal (3M ESPE Dental Products, St Paul, MN, USA)-were used to bond Z100 Restorative resin composite to enamel and dentin surfaces. A stainless-steel metal ring with an inner diameter of 2.4 mm was used to bond the resin composite to flat-ground (4000 grit) tooth surfaces for determination of both SBS and SFL. data. Scanning electronmicroscopy was used to examine the area of the bonded restorative/ tooth interface. For all three adhesive systems, phosphoric acid pre-etching of enamel demonstrated significantly higher (p,0.05) SBS and SFL with pre-etching than it did without preetching. The SBS and SFL of dentin bonds decreased with phosphoric acid pre-etching. The SBS and SFL of bonds using phosphoric acid prior to application of self-etching adhesives clearly demonstrated different tendencies between enamel and dentin. The effect of using phosphoric acid, prior to the application of the self-etching adhesives, on SBS and SFL was dependent on the adhesive material and tooth substrate and should be carefully considered in clinical situations. Fifteen specimens each were used to determine initial SBS to human enamel/dentin, with and without pre-etching with a 35% phosphoric acid (Ultra-Etch, Ultradent Products Inc, South Jordan, UT, USA) for 15 seconds prior to the application of the adhesives. A staircase method of fatigue testing (25 specimens for each test) was then used to determine the SFL of resin composite bonded to enamel/dentin using a frequency of 10 Hz for 50,000 cycles or until failure occurred. A two-way analysis of variance and Tukey post hoc test were used for analysis of SBS data, and a modified t-test with Bonferroni correction was used for the SFL data. Scanning electronmicroscopy was used to examine the area of the bonded restorative/ tooth interface. For all three adhesive systems, phosphoric acid pre-etching of enamel demonstrated significantly higher (p>0.05) SBS and SFL with pre-etching than it did without preetching. The SBS and SFL of dentin bonds decreased with phosphoric acid pre-etching. The SBS and SFL of bonds using phosphoric acid prior to application of self-etching adhesives clearly demonstrated different tendencies between enamel and dentin. The effect of using phosphoric acid, prior to the application of the self-etching adhesives, on SBS and SFL was dependent on the adhesive material and tooth substrate and should be carefully considered in clinical situations.

Original languageEnglish (US)
Pages (from-to)379-395
Number of pages17
JournalOperative dentistry
Volume40
Issue number4
DOIs
StatePublished - Jul 1 2015

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All Science Journal Classification (ASJC) codes

  • Dentistry(all)

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