Effect of dentin preparation mode on the bond strength between human dentin and different resin cements

• Main Authors: Borges, G.A (Author), Calabrez Filho, S. (Author), Cerqueira, L.A.C (Author), Correr-Sobrinho, L. (Author), Costa, A.R (Author), Miranzi, B.A.S (Author), Miyashita, E. (Author), Spohr, A.M (Author)
• Format: Article
• Language: English
• Published: Associacao Brasileira de Divulgacao Cientifica 2018
• Subjects: bisphenol A bis(2 hydroxypropyl) ether dimethacrylate; Bisphenol A-Glycidyl Methacrylate; chemistry; dental bonding; Dental Bonding; Dental Cavity Preparation; dental procedure; Dental Stress Analysis; dental surgery; dentin; Dentin; dentin bonding agent; Dentin preparation mode; Dentin-Bonding Agents; human; Humans; Hybrid layer; macrogol; Microscopy, Electron, Scanning; Microtensile bond strength; Molar, Third; Polyethylene Glycols; polymethacrylic acid derivative; Polymethacrylic Acids; procedures; RelyX ARC; RelyX U200; resin cement; Resin cements; Resin Cements; scanning electron microscopy; Smear layer; Smear Layer; tensile strength; Tensile Strength; third molar
• Online Access: View Fulltext in Publisher

 The aim was to evaluate the influence of different dentin preparation mode in the smear layer characteristics (SL), hybrid layer (HL), and microtensile bond strength (µTBS) to dentin with two resin cements. The occlusal dentin of 120 third molars was exposed. The teeth were divided into 4 groups (n=30) according to the dentin preparation mode: 1-fine grain diamond bur; 2-coarse grain diamond bur; 3-multi laminate carbide steel bur; and, 4-ultrasonic CV Dentus diamond bur. Each treated dentin group was divided into 2 sub-groups (n=15) according to the resin cement: (1) RelyX U200 and (2) RelyX ARC. Resin composite blocks were cemented on dentin. After storage at 37o C for 24 h, beams with a cross section area of 1.0 mm2 were obtained, and tested in a universal testing machine at a crosshead speed of 0.5 mm/min. Two additional teeth for each sub-group were prepared to analyze the SL and HL on a scanning electron microscopy. According to Kruskal-Wallis test and Dunn tests, there was no significant difference in µTBS among the rotary instruments within each resin cement group. RelyX ARC obtained higher µTBS values compared to RelyX U200 (p<0.05). RelyX ARC formed evident HL, which was not observed for RelyX U200. The dentin mode preparation did not influence the µTBS of the resin cements. The SL was different for all instruments. The cementing agent is more determinant in the hybrid layer formation and bond strength to dentin than the instruments applied on dentin. © 2018, Associacao Brasileira de Divulgacao Cientifica. All rights reserved.