C W Pires1, T L Lenzi2, F Z M Soares3, R O Rocha4. 1. University Center of Serra Gaúcha, Caxias do Sul, RS, Brazil. cwpodonto@gmail.com. 2. Department of Surgery and Orthopedics, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil. 3. Department of Restorative Dentistry, Federal University of Santa Maria, Santa Maria, RS, Brazil. 4. Department of Stomatology, Federal University of Santa Maria, Santa Maria, RS, Brazil.
Abstract
AIM: This was to evaluate the influence of root canal filling pastes on microshear bond strength (µSBS) of an adhesive system to primary dentine. METHODS:Human (32) primary molars were randomly assigned into four experimental groups (n = 8): zinc oxide eugenol paste (ZOE); iodoform paste (Guedes-Pinto paste); calcium hydroxide paste thickened with zinc oxide; and no filling paste (control). Flat dentine surfaces were covered with a 1 mm-thick layer of the pastes for 15 min at 37 °C. The pastes were mechanically removed from dentine surfaces, followed by rinsing and drying. After adhesive application (Adper Single Bond 2, 3M ESPE), starch tubes were placed over pre-treated dentine and filled with composite resin (Z250, 3M ESPE). The µSBS test was performed after 24 h of water storage at 37 °C. The failure mode was evaluated using a stereomicroscope. The µSBS values (MPa) were analysed with one-way ANOVA and Tukey post-hoc tests (α = 0.05). RESULTS: The lowest µSBS values were achieved when ZOE was used. No difference was found among other filling pastes compared with control group. All specimens showed adhesive/mixed failures. CONCLUSIONS:Zinc oxide eugenol paste negatively influenced the bond strength of adhesive systems to primary dentine. Iodoform-based Guedes-Pinto paste and calcium hydroxide paste thickened with zinc oxide did not influence the microshear bond strength values.
RCT Entities:
AIM: This was to evaluate the influence of root canal filling pastes on microshear bond strength (µSBS) of an adhesive system to primary dentine. METHODS:Human (32) primary molars were randomly assigned into four experimental groups (n = 8): zinc oxideeugenol paste (ZOE); iodoform paste (Guedes-Pinto paste); calcium hydroxide paste thickened with zinc oxide; and no filling paste (control). Flat dentine surfaces were covered with a 1 mm-thick layer of the pastes for 15 min at 37 °C. The pastes were mechanically removed from dentine surfaces, followed by rinsing and drying. After adhesive application (Adper Single Bond 2, 3M ESPE), starch tubes were placed over pre-treated dentine and filled with composite resin (Z250, 3M ESPE). The µSBS test was performed after 24 h of water storage at 37 °C. The failure mode was evaluated using a stereomicroscope. The µSBS values (MPa) were analysed with one-way ANOVA and Tukey post-hoc tests (α = 0.05). RESULTS: The lowest µSBS values were achieved when ZOE was used. No difference was found among other filling pastes compared with control group. All specimens showed adhesive/mixed failures. CONCLUSIONS:Zinc oxideeugenol paste negatively influenced the bond strength of adhesive systems to primary dentine. Iodoform-based Guedes-Pinto paste and calcium hydroxide paste thickened with zinc oxide did not influence the microshear bond strength values.
Authors: Alexandra Mussolino de Queiroz; Sada Assed; Alberto Consolaro; Paulo Nelson-Filho; Mario Roberto Leonardo; Raquel Assed Bezerra Silva; Lea Assed Bezerra Silva Journal: Braz Dent J Date: 2011
Authors: Nelson Renato Franca Alves da Silva; Christine S Calamia; Paulo G Coelho; Marcela Rocha de Oliveira Carrilho; Ricardo Marins de Carvalho; Page Caufield; Van P Thompson Journal: J Appl Oral Sci Date: 2006-12 Impact factor: 2.698