F Z M Soares1, T L Lenzi2, R de Oliveira Rocha3. 1. Department of Restorative Dentistry, Federal University of Santa Maria, Santa Maria, RS, Brazil. 2. Graduate Program in Dental Science, Federal University of Santa Maria, Santa Maria, RS, Brazil. 3. Department of Stomatology, Federal University of Santa Maria, Rua Marechal Floriano Peixoto, 1184, Santa Maria, RS, 97015-270, Brazil. rachelrocha@smail.ufsm.br.
Abstract
AIM: To evaluate the water storage degradation of resin-dentine bonds of different adhesive systems to primary and permanent human dentine. METHODS: Flat occlusal human dentine surfaces of 15 primary molars and 15 permanent molars were randomly assigned according to adhesive systems: Adper Single Bond 2; Clearfil SE Bond and One Up Bond F Plus. After bonding procedures, the adhesives were applied according to the manufacturers' instructions and composite resin blocks were built. Restored teeth were sectioned rendering rectangular sticks (RS) (0.4 mm2). The RS were submitted to microtensile bond strength (µTBS) test according to the water storage time: 24 h, 1-year, and 2-years. Mean µTBS values were analysed by three-way analysis of variance (mixed design) and Tukey post hoc test (α = 0.05). The failure mode was analysed at 400× magnification. RESULTS: All three factors isolated showed significant influences on µTBS, as did the cross-product interactions between material vs. storage time (p = 0.01) and substrate vs. storage time (p = 0.002). Bond strength means to primary dentine were lower than to permanent dentine (34.7 ± 10.1 and 45.8 ± 12.9 mPa, respectively) after 2-years of water storage. The one-step self-etch adhesive (One Up Bond F Plus) showed less stable bond strength after 2-years of water storage. CONCLUSION: The resin-dentine bond of primary teeth was more prone to degradation over time compared to permanent dentine.
AIM: To evaluate the water storage degradation of resin-dentine bonds of different adhesive systems to primary and permanent human dentine. METHODS: Flat occlusal human dentine surfaces of 15 primary molars and 15 permanent molars were randomly assigned according to adhesive systems: Adper Single Bond 2; Clearfil SE Bond and One Up Bond F Plus. After bonding procedures, the adhesives were applied according to the manufacturers' instructions and composite resin blocks were built. Restored teeth were sectioned rendering rectangular sticks (RS) (0.4 mm2). The RS were submitted to microtensile bond strength (µTBS) test according to the water storage time: 24 h, 1-year, and 2-years. Mean µTBS values were analysed by three-way analysis of variance (mixed design) and Tukey post hoc test (α = 0.05). The failure mode was analysed at 400× magnification. RESULTS: All three factors isolated showed significant influences on µTBS, as did the cross-product interactions between material vs. storage time (p = 0.01) and substrate vs. storage time (p = 0.002). Bond strength means to primary dentine were lower than to permanent dentine (34.7 ± 10.1 and 45.8 ± 12.9 mPa, respectively) after 2-years of water storage. The one-step self-etch adhesive (One Up Bond F Plus) showed less stable bond strength after 2-years of water storage. CONCLUSION: The resin-dentine bond of primary teeth was more prone to degradation over time compared to permanent dentine.
Entities:
Keywords:
Bond strength; Dentine; Permanent teeth; Primary teeth
Authors: Paulette Spencer; Qiang Ye; Jonggu Park; Elizabeth M Topp; Anil Misra; Orestes Marangos; Yong Wang; Brenda S Bohaty; Viraj Singh; Fabio Sene; John Eslick; Kyle Camarda; J Lawrence Katz Journal: Ann Biomed Eng Date: 2010-02-27 Impact factor: 3.934
Authors: F D Nascimento; C L Minciotti; S Geraldeli; M R Carrilho; D H Pashley; F R Tay; H B Nader; T Salo; L Tjäderhane; I L S Tersariol Journal: J Dent Res Date: 2011-01-19 Impact factor: 6.116