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J Orthod Sci. 2018 Feb 15;7:1. doi: 10.4103/jos.JOS_51_17. eCollection 2018.

Survival analysis of an orthodontic bracket bond subjected to cyclic tensile and shear forces.

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1
Department of Dental Public Health, Faculty of Dentistry, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia.

Abstract

OBJECTIVES:

The objective of this study was to evaluate the use of survival analysis in cyclic fatigue testing in orthodontic bracket bonding.

MATERIALS AND METHODS:

We used 100 extracted bovine lower incisors (50 orthodontic brackets and 50 eyelet brackets). Each set of brackets was further divided by etching technique (25 total-etch and 25 self-etch). Cyclic fatigue testing was performed at a crosshead speed of 2 mm/min using an up-and-down method. Kaplan-Meier survival data analyses and Cox regression analyses were performed.

RESULTS:

Survival analysis proved to be a simple methodology and revealed that the etching technique was not a statistically significant predictor for survival of orthodontic bracket bonding with either tensile or shear cyclic forces at P > 0.05. In tensile cyclic loading, high mechanical loading after controlling for the etching technique is a statistically significant predictor for lower survival of the orthodontic bracket bond at P < 0.001.

CONCLUSIONS:

Both etching techniques (total-etch and self-etch) are equally efficient in bonding orthodontic brackets. High mechanical loading is an important predictor of bond failure when applying tensile cyclic forces. Finally, survival analysis is a simpler alternative method to analyze orthodontic bracket bonding subjected to cyclic tensile and shear forces and gives similar results to other complicated methods.

KEYWORDS:

Cyclic shear; cyclic tensile; survival analysis

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