A Comparison of Shear Bond Strength of Two Different Techniques with that of Initially Bonded Brackets

Abstract

Introduction: Bonding failure is recognized as the main concern in the daily practice of orthodontics. The failed bracket are usually rebonded on the tooth surface and several techniques have been used such as sand-pining and re-etching to enhance the effectiveness of bracket bonding to teeth surface. However, there are few investigations examined. The bond strength of bracket and the effectiveness of enhancement techniques have never been studied. Materials and methods: In this investigation, the shear bond strength of two different rebonding techniques of sandblasting and re-etching which are common in dentistry were evaluated and compared with primary bonding strength. Results: The mean shear stress for primary bonding interface (control samples) of brackets was 172.11 kg force/cm 2. These values for rebonded brackets using two techniques of sandblasting and re-etching were 165.89 kg force/cm 2 and 144.23 kg force/cm 2 , respectively. Conclusion: However, there was no significant difference in the shear strength responses of three groups. The results of the study showed that both techniques of rebonding of failed brackets can provide effective bonding strengths similar to the primary strength.

A Comparison of Shear Bond Strength Values of Recycled Self-Ligating Ceramic Brackets with a New Ones (An-in Vitro Study)

“…There is a tendency toward simplifying the technical methods in orthodontics for reducing treatment costs, like other fields of dentistry [6] . Thus, for rebonding a bracket, using the same non distorted bracket instead of a new one seems to be the most cost-effective method, although adequate bond strength must be maintained.…”