Comparison of the shear bond strength of new and recycled metallic brackets using different adhesive materials. An in vitro study

Authors : Nicole IBARRA, Mackarena SÁEZ, Victor ROJAS, Rodrigo OYONARTE

Pages : 96-102

Doi:10.26650/eor.20231163180

View : 27 | Download : 52

Publication Date : 2023-05-31

Article Type : Research Paper

Abstract :Purpose To evaluate and compare shear bond strength insert ignore into journalissuearticles values(SBS); of new and recycled metallic brackets bonded to conditioned and reconditioned enamel, using two different adhesive materials. Material and Method 72 extracted sound human premolars were randomly divided into 6 groups. Transbond XT light cured composite insert ignore into journalissuearticles values(LCC); and Fuji Ortho LC resin-modified glass ionomer insert ignore into journalissuearticles values(RMGI);, were used as adhesive materials. In groups 1 and 2 insert ignore into journalissuearticles values(control);, new brackets were bonded to sound premolars using either LCC or RMGI, respectively. In Groups 3 and 4, new brackets were bonded to reconditioned enamel; and in groups 5 and 6, sandblasted recycled brackets were rebonded to reconditioned enamel. After 5.000 thermal cycles between 5ºC and 55ºC, SBS was evaluated and adhesive remnant on the enamel assessed using the ARI index. Statistical analyses included Shapiro-Wilk, ANOVA, Fligner-Killeen ANOVA and Tukey tests. Results The statistical analysis showed no significant difference in SBS comparing control and experimental groups for either new or recycled brackets insert ignore into journalissuearticles values(p = 0.848);. The SBS was significantly higher in brackets bonded with LCC insert ignore into journalissuearticles values(15.7 MPa); than RMGI insert ignore into journalissuearticles values(11.6 MPa); insert ignore into journalissuearticles values(p = 0.006);. Adhesive failure was the most frequent, with the adhesive remnant covering more than 50% of the bracket base. Conclusion No significant differences were observed in SBS using either new or recycled brackets, regardless of the dental surface treatment insert ignore into journalissuearticles values(conditioned or reconditioned);. Significantly higher SBS values were obtained with LCC adhesive. Adhesive failure prevails in all groups.
Keywords : Shear bond strength, Metallic brackets, Adhesive materials, Recycled brackets, Thermal cycling