Bond Strength of Color Changing Adhesives Used With Aesthetic Brackets (original) (raw)

Abstract

ABSTRACT Objective: To compare the bond strengths of two color change orthodontic adhesives when used with three different aesthetic brackets. Methods: Three hundred sixty extracted bovine incisors were randomly divided into 18 groups of 20 teeth. After the application of a self etching primer (Transbond Plus Self Etch Primer, 3M Unitek), three types of aesthetic brackets (Clarity, 3M Unitek, CL; Radiance, American Orthodontics, R; Damon D3, Ormco, D3) were bonded using three types of orthodontic adhesives (Transbond XT, 3M Unitek, TBXT; Transbond Plus Color Change Adhesive, 3M Unitek, TB-Pink; Blugloo, Ormco, BG). The specimens were stored in sodium azide at 37C. Each bracket and adhesive combination was debonded immediately and at 24 hours in shear on an Instron at 1.0 mm/min. The data were analyzed by two-way analysis of variance and post-hoc comparisons (Fisher's PLSD) at the 0.05 level of significance. Results: Means (MPa) with standard deviations in parentheses are listed in Table 1 (n=20). Fisher's PLSD intervals for comparisons of means among cements, brackets and times were 1.0, 1.0 and 0.9 MPa, respectively, indicating significant differences among these factors. Bond strengths to bracket CL were the highest among brackets tested. Adhesive BG had higher immediate bond strengths than TBXT. Bond strengths generally increased from immediate to 24 hrs. The bond strengths were considered to be clinically acceptable (7.3-13.9MPa). Bracket/Adhesive 0 hrs 24 hrs CL/TBXT 11.1 (6.5) 13.6 (3.9) CL/TB-Pink 12.5 (2.8) 12.3 (4.8) CL/BG 13.8 (3.2) 13.0 (4.8) D3/TBXT 7.8 (2.4) 9.3 (1.7) D3/TB-Pink 8.3 (1.6) 8.8 (1.5) D3/BG 9.6 (2.3) 7.8 (3.1) R/TBXT 7.3 (3.4) 11.3 (4.4) R/TB-Pink 10.7 (5.6) 11.1 (6.1) R/BG 9.5 (6.1) 12.8 (5.0) Conclusions: Differences in shear bond strengths in-vitro among cements, brackets and time of testing were significant.

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