The effect of dentine surface preparation and reduced application time of adhesive on bonding strength

• Published in: Journal of dentistry Vol. 47; pp. 63 - 70
• Main Authors: Saikaew, Pipop, Chowdhury, A.F.M. Almas, Fukuyama, Mai, Kakuda, Shinichi, Carvalho, Ricardo M, Sano, Hidehiko
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-04-2016; Elsevier Limited
• Subjects: Acid Etching, Dental - methods; Adhesive bonding; Adhesive strength; Adhesives; Analysis of variance; Aqueous solutions; Bond strength; Bonding; Bonding application time; Bonding strength; Dental Bonding - methods; Dental High-Speed Equipment; Dental Stress Analysis; Dentin - chemistry; Dentin - drug effects; Dentin-Bonding Agents - chemistry; Dentin-Bonding Agents - pharmacology; Dentistry; Disinfection & disinfectants; Enamel; Etching; Humans; Light; Microtensile bond strength; Molar, Third - drug effects; Molar, Third - ultrastructure; Random Allocation; Scanning electron microscopy; SEM; Silicon carbide; Smear Layer - chemistry; Solvents; Surface preparation; Surface Properties; Teeth; Tooth Fractures - therapy; Tooth Preparation - methods; Universal adhesives; Japan; Bonding application time; SEM; Microtensile bond strength; Universal adhesives; Surface preparation
• ISSN: 0300-5712; 1879-176X
• DOI: 10.1016/j.jdent.2016.02.001

Abstract Objective This study evaluated the effects of surface preparation and the application time of adhesives on the resin–dentine bond strengths with universal adhesives. Methods Sixty molars were cut to exposed mid-coronal dentine and divided into 12 groups ( n = 5) based on three factors; (1) adhesive: G-Premio Bond (GP, GC Corp., Tokyo, Japan), Clearfil Universal Bond (CU, Kuraray Noritake Dental Inc., Okayama, Japan) and Scotchbond Universal Adhesive (SB, 3M ESPE, St. Paul, MN, USA); (2) smear layer preparation: SiC paper ground dentine or bur-cut dentine; (3) application time: shortened time or as manufacturer’s instruction. Fifteen resin–dentine sticks per group were processed for microtensile bond strength test (μTBS) according to non-trimming technique (1 mm2 ) after storage in distilled water (37 °C) for 24 h. Data were analyzed by three-way ANOVA and Dunnett T3 tests ( α = 0.05). Fractured surfaces were observed under scanning electron microscope (SEM). Another 12 teeth were prepared and cut into slices for SEM examination of bonded interfaces. Results μTBS were higher when bonded to SiC-ground dentine according to manufacturer’s instruction. Bonding to bur-cut dentine resulted in significantly lower μTBS ( p < 0.000). Shortening the application time resulted in significantly lower bond strength for CU on SiC and GP on bur-cut dentine. SEM of fractured surfaces revealed areas with a large amount of porosities at the adhesive resin interface. This was more pronounced when adhesives were bonded with a reduced application time and on bur cut dentine. Clinical significance The performance of universal adhesives can be compromised on bur cut dentine and when applied with a reduced application time.