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The relationship between base dimensions, force to failure, and shear bond strengths of bondable molar tubes
Marvi Talpur1, Susan J Cunningham, David R Moles
1UCL Eastman Dental Institute, London, UK.
Objectives:
To compare forces versus failure and shear bond strengths, and to explore their association with the base dimensions of four currently available bondable molar tubes.
Materials And Methods:
Tubes were bonded to hydroxyapatite discs using a conventional light-cured adhesive and were tested to shear failure with the Instron Universal testing machine. Results were analyzed using the Kruskal-Wallis test and regression and survival analyses.
Results:
No statistical difference was observed between the four groups globally in terms of force to failure (P = .059) and bond strength (P = .179). However, regression analysis showed that each 1 mm(2) increase in base surface area required an additional force of 3.11 N to debond the tube. Survival analysis showed that the tube with the greatest base dimensions had the best survival with increasing force to failure.
Conclusions:
Although a relationship was demonstrated between force to failure and base surface area, it was not a simple one. No statistically significant relationship was found between bond strength and base surface area.
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