Chulalongkorn University Dental Journal

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Objectives The purposes of the current study were to compare the mean shear bond strengths of brackets to temporary crowns with and without sandblasting when used by chemical-cured (self-cured) and light-cured composite resin, to self-cured and light-cured glass ionomer, and to evaluate bond failure of all samples. Materials and methods Three hundred temporary crowns were divided into 10 groups with 30 samples in each group to bond metal brackets with sandblasting (SB) or non-sandblasting (NSB). Five kinds of adhesives: one-paste (O), two-paste self-cured (T), light-cured (LC) composite resin, glass ionomer (1) and light-cured glass ionomer (LI) were used. The surface preparation of the NP samples in groups 1 to 10 was cleaning by pumice, and sandblasting in groups 6 to 10. Testing of shear force was performed and mean shear bond strengths were calculated to find the significant difference between the NSB and SB groups of the same adhesive by t-test and among groups 1 to 5 and groups 6 to 10 by ANOVA and Tukey multiple range analysis. Location of bond failure was evaluated and observed by stereomicroscope. Results Shear bond strengths of the I NSB (2.34 MPa) showed the lowest and were significantly different from the other NSB groups (5.26 to 5.80 MPa) (p<0.05). After sandblasting, shear bond strengths of all samples in the SB groups revealed higher values (7.00 to 7.26 MPa) than the NSB groups, but the I SB (3.41 MPa) group still had a clinically lower-than-accepted value. Bond failure according to ARI score in all the NP NSB groups exhibited more scores 0 and 1 (no score 3). After sandblasting, the SB groups had more samples of score 3 (except the I SB). Location of bond failure in the SB groups revealed more failure between interfaces of crown/adhesive and adhesive/bracket than in the NSB group (except I group). Conclusion It suggested that bonding resin-type adhesives to non-porcelain samples produce shear bond strength more than 5 MPa and sandblasting could enhance micromechanical retention to increase shear bond strength.



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