V17N04 | 2012 | Original Article | Pages 192 to 198
Roberto Hideo Shimizu, Karlos Giovani Grando, Isabela Almeida Shimizu, Augusto Ricardo Andriguetto, Ana Cláudia Moreira Melo, Eduardo Leão Witters
Dental bonding, Dental debonding, Shear bond strength, Corrective Orthodontics,
Objective: This in vitro study was designed to evaluate the shear bond strength (SBS) of orthodontic metal brackets bonded by direct and indirect techniques. Methods: Thirty healthy human maxillary premolar teeth were used. The teeth were divided into three groups of 10 teeth each: Group I – Indirect bonding with Sondhi™ Rapid-Set system (3M/Unitek), Group II – Indirect bonding with Transbond™ XT adhesive system (3M/Unitek) and Group III – Direct bonding with Transbond™ XT Adhesive system (3M/Unitek). After bonding and obtaining the specimens for the study, the specimens were subjected to SBS testing in a universal testing machine (Emic, model DL – 500). The Kolmogorov-Smirnov test was applied to ascertain that the data had a normal distribution and the Bartlett test to check whether there was homogeneity of variance. One-factor analysis of variance was performed and, subsequently, Tukey’s test for paired means. A 5% significance level was adopted. Results: The results of Group I were 67.6 (N) and 5.9 (MPa), Group II, 68.9 (N) and 6.1 (MPa) and Group III (control) 92.5 (N) and 8.1 (MPa). Conclusion: It can therefore be concluded that the means for Group III were significantly higher compared with groups I and II in both Newton (N) and Mega Pascal (MPa) values. The means attained by the indirect bonding technique used in Groups I and II, however, exhibited no statistically significant differences.