Influence of enamel wetness on composite restorations using various dentine bonding agents: Part II-effects on shear bond strength

Shu Fen Chuang, Li Tung Chang, Chih Han Chang, Peter Yaman, Jia Kuang Liu

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Objectives: To investigate the bond strength and fracture characteristics of various dentine bonding agents (DBAs) on wet or dry enamel. Methods: Forty molar halves with enamel flattened were divided into 5 groups. Groups 1-4, teeth were acid-etched and treated separately with either an ethanol-based adhesive (SingleBond) or an acetone-based adhesive (Prime & Bond NT) on dry or wet enamel. Group 5 was treated with a self-etching adhesive (Clearfil SE Bond). The treated enamel surfaces were bonded with Z 250 composite with metal rings. The composite-ring assemblies were subjected to shear bond test until failure. Failure patterns on the debonded surfaces were inspected under a scanning electron microscope. The bonded enamel thickness was measured on sectioned specimens to investigate their statistical evidence. Results of open margin and enamel microcrack ratios from Part I of this study were compared with these fracture characteristics. Data was analyzed statistically. Results: There was no difference in the bond strength between paired groups using the same DBA on wet or dry enamel. The teeth restored with self-etching adhesive exhibited lower bond strength and higher adhesive-enamel failure rate than the other groups. No correlation between enamel thickness, microcrack, bond strength, and failure patterns was revealed. Conclusion: The self-etching adhesive had a lower enamel bond strength than the other bonding systems. The difference in the failure patterns of groups with ethanol- and acetone-based DBAs on wet or dry enamel was indistinct. The frequently observed enamel microcrack cannot be directly correlated with the bond strength of bonding systems.

Original languageEnglish
Pages (from-to)352-361
Number of pages10
JournalJournal of Dentistry
Issue number5
Publication statusPublished - 2006 May

All Science Journal Classification (ASJC) codes

  • Dentistry(all)


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