Nattaporn Sukprasert1, Choltacha Harnirattisai1, Pisol Senawongse1, Hidehiko Sano2, Pipop Saikaew3. 1. Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Mahidol University, Ratchathewi District, No. 6, Yothi Road, Bangkok, 10400, Thailand. 2. Department of Restorative Dentistry, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan. 3. Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Mahidol University, Ratchathewi District, No. 6, Yothi Road, Bangkok, 10400, Thailand. pipop045@gmail.com.
Abstract
OBJECTIVE: To evaluate the effect of a time delay before the light activation of resin composite on the microtensile bond strength (µTBS) of self-etch adhesives under dynamic simulated pulpal pressure. MATERIALS AND METHODS: One hundred twenty crown segments were prepared from human third molars. Dentin surfaces were prepared with coarse diamond burs and connected to a dynamic pulpal pressure device. The self-etch adhesives used were Clearfil SE Bond (CSE), G2-Bond Universal (G2B), Clearfil Universal Bond Quick (CBQ), and G-Premio Bond (GPB). Each adhesive was divided into 3 subgroups: immediate light activation of resin composite (T0), delayed light activation for 150 s (T1), and 300 s (T2). The µTBS data were obtained after 24-h water storage. Scanning electron microscopy was used to evaluate the nanoleakage at the resin-dentin surface. The µTBS data were analyzed using two-way ANOVA and Duncan's multiple comparisons. RESULTS: All adhesives demonstrated a significant reduction in µTBS at T2, except for CBQ where the bond strength was not affected by the delayed light activation times. The two-step self-etch adhesives (CSE and G2B) demonstrated higher bond strength than the one-step adhesives at all conditions. Nanoleakage was observed in all adhesives at T2; however, nanoleakage was detected only in CBQ and GPB at T1. CONCLUSIONS: Delayed light activation of resin composite adversely affected the dentin bond strength of self-etch adhesives. Two-step self-etch adhesives had better bonding performance than one-step self-etch adhesives. CLINICAL RELEVANCE: After adhesive application, resin composite should be adapted and cured as soon as possible.
OBJECTIVE: To evaluate the effect of a time delay before the light activation of resin composite on the microtensile bond strength (µTBS) of self-etch adhesives under dynamic simulated pulpal pressure. MATERIALS AND METHODS: One hundred twenty crown segments were prepared from human third molars. Dentin surfaces were prepared with coarse diamond burs and connected to a dynamic pulpal pressure device. The self-etch adhesives used were Clearfil SE Bond (CSE), G2-Bond Universal (G2B), Clearfil Universal Bond Quick (CBQ), and G-Premio Bond (GPB). Each adhesive was divided into 3 subgroups: immediate light activation of resin composite (T0), delayed light activation for 150 s (T1), and 300 s (T2). The µTBS data were obtained after 24-h water storage. Scanning electron microscopy was used to evaluate the nanoleakage at the resin-dentin surface. The µTBS data were analyzed using two-way ANOVA and Duncan's multiple comparisons. RESULTS: All adhesives demonstrated a significant reduction in µTBS at T2, except for CBQ where the bond strength was not affected by the delayed light activation times. The two-step self-etch adhesives (CSE and G2B) demonstrated higher bond strength than the one-step adhesives at all conditions. Nanoleakage was observed in all adhesives at T2; however, nanoleakage was detected only in CBQ and GPB at T1. CONCLUSIONS: Delayed light activation of resin composite adversely affected the dentin bond strength of self-etch adhesives. Two-step self-etch adhesives had better bonding performance than one-step self-etch adhesives. CLINICAL RELEVANCE: After adhesive application, resin composite should be adapted and cured as soon as possible.
Authors: Salvatore Sauro; David H Pashley; Marco Montanari; Stefano Chersoni; Ricardo M Carvalho; Manuel Toledano; Raquel Osorio; Franklin R Tay; Carlo Prati Journal: Dent Mater Date: 2006-08-09 Impact factor: 5.304
Authors: Mohammed H Ahmed; Jan De Munck; Kirsten Van Landuyt; Marleen Peumans; Kumiko Yoshihara; Bart Van Meerbeek Journal: J Adhes Dent Date: 2019 Impact factor: 2.359
Authors: Carlos Enrique Cuevas-Suárez; Wellington Luiz de Oliveira da Rosa; Rafael Guerra Lund; Adriana Fernandes da Silva; Evandro Piva Journal: J Adhes Dent Date: 2019 Impact factor: 2.359