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In-vitro Shear Bond Strength of Self-etching versus Traditional Adhesives for Orthodontic Luting.

Holzmeier M, Ernst CP, Willershausen B, Hirschfelder U

Department of Orthodontics, Friedrich-Alexander University, Erlangen-Nuremberg, Germany.

OBJECT: To determine the enamel shear bond strength (SBS) of various established (Resulcin((R)) Aqua Prime & Monobond N [RA], Prompttrade mark L-Potrade mark III [PLP]) and experimental (AC-Bond [AC], AC-Bond + Desensitizer [ACD]) self-etching adhesives in comparison to fourth (Total Etch, Primer and Bonding have separate liquids; OptiBond((R)) FL [FL]) and fifth-generation (Total Etch, Primer and Bonding "One Bottle"; Excite((R)) [EX], Gluma((R)) Comfort Bond [CB]) adhesives. MATERIALS AND METHODS: All adhesives were applied on flattened human enamel surfaces following the manufacturers' instructions and light-cured using a quartz-tungsten-halogen curing device. 3.5 x 2.0 mm Tetric Ceram((R)) A2 composite cylinders were sheared off (Zwick Universal-testing-machine 1445, 1 mm/min) after thermocycling (5-55 degrees C, 5000x). Normal distribution was tested for all groups and analysis of variance was conducted. The t-test (5% level, Bonferroni-correction) was used for statistical analysis to evaluate intergroup differences. RESULTS: Shear bond strength in enamel: Resulcin((R)) Aqua Prime & Monobond N: 27.0 +/- 5.8 MPa, Prompttrade mark L-Poptrade mark III: 15.9 +/- 3.4 MPa, AC-Bond: 28.1 +/- 4.4 MPa, AC-Bond + Desensitizer: 22.2 +/- 4.1 MPa, OptiBond((R)) FL: 33.2 +/- 3.2 MPa, Excite((R)): 30.5 +/- 5.1 MPa, Gluma((R)) Comfort Bond: 30.1 +/- 3.7 MPa.OptiBond((R)) FL demonstrated significantly higher SBS (p < 0.002) in enamel than Resulcin((R)) Aqua Prime & Monobond N, AC-Bond, AC-Bond + Desensitizer and Prompttrade mark L-Poptrade mark III. Resulcin ((R)) Aqua Prime & Monobond N performed significantly better than Prompttrade mark L-Poptrade mark III, but did not differ from AC-Bond or AC-Bond + Desensitizer. The SBS values of Excite((R)) and Gluma((R)) Comfort Bond were both on the same level of significance as AC-Bond and Resulcin((R)) Aqua Prime & Monobond N, but the former showed superior results to AC-Bond + Desensitizer and Prompttrade mark L-Poptrade mark III. Prompttrade mark L-Poptrade mark III yielded significantly lower SBS-values than all the other products evaluated. CONCLUSION: Resulcin((R)) Aqua Prime & Monobond N and AC-Bond did not differ significantly from established 5th-generation products. Further in-vivo studies are required to investigate intra-oral stability and resistance against changing forces and force directions.

Published 13 July 2006 in J Orofac Orthop, 67(4): 244-259.
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