Improving Tensile Bond Strength of Orthodontic Bracket by Applying Papain Gel as an Email Deproteinization Agent

Abstract

An effort to improve the bonding between bracket and tooth surface is required. Objective: The aim of this studywas to evaluate the effect of papain gel on tensile bond strength (TBS) and adhesive remnant index (ARI) of the orthodontic brackets. Methods: A total of 42 healthy human premolars were randomly divided into six groups. 1) Resin-modifed glass ionomer cement (RMGIC) without papain, 2) RMGIC with papain 8%, 3) RMGIC with papain 10%, 4) Composite resin (CR) without papain, 5) CR with papain 8%, 6) CR with papain 10%. The TBS was determined using a universal testing machine. Bond failure was classifed according to the ARI. The TBS data were analyzed with Kruskal-Wallis test followed by Mean Whitney tests with 5% of signifcance level. Results: The mean of TBS(MPa) values of RMGIC groups are without papain (5.03 ± 1.52), papain 8% (4.79 ± 2.61), papain 10 (7.75 ± 1, 48). CR groups without papain (5.45 ± 1.23), papain 8% (2.30 ± 0.73), and papain 10% (4.84 ± 1.72) Bond failure was mainly classifed as score 1. The TBS values were statistically influenced by the application of papain and adhesive. Conclusion: The application of papain 10% before RMGIC cementation improves the tensile bond strength and could decrease the bond failure of the orthodontic bracket.

Keywords

• enamel
• orthodontic bracket
• papain
• tensile bond strength