A comparative study about bonding strength of customized metal base for lingual orthodontic appliance made by non-precious metal

Abstract

The purpose of this study was to evaluate the maximum bonding strength of three different agents used to customize the metal base for lingual orthodontic appliance made using non-precious metal. Methods: 60 human premolar (Upper 30, Lower 30) specimens were randomly divided into 3 groups, based on the combination of three different bonding agents (No mix, Mix, Dual cure resin cement). After processing by direct bonding in accordance with each manufacturer`s instructions, all specimens underwent thermocycling. The maximum bonding strength was measured at the moment of metal base debonding. Results: Application of dual cure type resin cement (Unicem, 19.68±4.72 MPa) yielded a higher bond strength than the other two bonding agents (Reliance:11.56±3.94 MPa, and Premix:12.30±3.53 MPa). Conclusion: The dual cure type resin cement has a clinically satisfactory bond strength, which can be attained when customizing the metal base for lingual orthodontic appliance made with non-precious metals, using the direct bonding process.