In vitro peel/shear bond strength evaluation of orthodontic bracket base design.
OBJECTIVE
The adhesive capacity of 17 different bracket types was evaluated in an in vitro peel/shear test.


METHODS
Silane-treated metal bars were used as substrates with all bonding being performed using the orthodontic adhesive Concise. The effect of aluminium oxide air abrasion on the bonding performance of recycled metal bracket bases was evaluated. Morphological examination of the bracket bases was carried out under scanning electron microscopy. Statistics analysis included one-way ANOVA with Tukey's Studentized Range Test, two-way ANOVA and Weibull analysis.


RESULTS
Mean peel/shear bond strength values range from 13.9 MPa for Allure Accu Arch, a ceramic bracket type, to 1.6 MPa for the plastic bracket CeramaFlex Advant Edge. Allure Accu Arch performed the best of all the ceramic brackets. However, bracket wing fracture was observed. The metal brackets Mini masters and Omni Arch showed no significant difference in bond strength compared with the ceramic bracket Allure Accu Arch (P < 0.01).


CONCLUSIONS
The type of the bracket base determines its adhesive capacity. Sandblasting the base of recycled metal brackets had no uniform effect.
Willems
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Department of Orthodontics, Faculty of Medicine, Katholieke Universiteit te Leuven, Belgium.
Carels
C E
CE
Verbeke
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G
D000268:Adhesiveness; D000269:Adhesives / Q000737:chemistry*; D000537:Aluminum Oxide; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D001840:Dental Bonding; D004868:Equipment Failure; D005069:Evaluation Studies as Topic; D006801:Humans; D008855:Microscopy, Electron, Scanning; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D010969:Plastics / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength
D000269:Adhesives; D003722:Dental Alloys; D010969:Plastics; D012821:Silanes; D017438:Bisphenol A-Glycidyl Methacrylate; D000537:Aluminum Oxide