A Comparative evaluation of the Shear bond strength of brackets bonded to pre-treated demineralised enamel treated with two different remineralising agents – An In-vitro study

Shafeen NaqheebShaik,
Kalyani Mallavarapu,
DR. P. REVATHI,*
DEVIKANTH LANKA,
Aruna Dokku,
Saravanan Pichai

Abstract

ABSTRACT: Background: Remineralising agents are suggested on sound enamel and on demineralised enamel during fixed appliance therapy as they increase the risk of enamel demineralization; but their influence on bond strength is questionable. Toothmin has been recently introduced and showed promising results in preventing demineralization and promoting remineralization similar to CPP-ACP.Therefore, the rationale of doing this study is to evaluate Toothmin efficacy on shear bond strength (SBS) of pre-treated demineralized enamel. Aims: To measure the SBS of brackets bonded to pretreated demineralised enamel treated with Toothmin and CPP-ACP. Settings and Design: Teeth were divided into four groups prior to bonding. Group I with No enamel pre-treatment, Group II, demineralized enamel, Group III, CPP-ACP was applied on demineralized enamel whereas in Group IV, Tooth min was applied on demineralised enamel. Methods and Materials: Intact enamel group, demineralised group and remineralised groups were evaluated for SBS and (Adhesive Remnant Index ) ARI scores. Statistical analysis: Data were analyzed using IBM SPSS version 20 software and subjedted to one way analysis of variance with Tukey’s post hoc tests. Results and Conclusions: Toothmin group had highest mean SBS (10.37±3.08) followed by CPP-ACP (9.6±2.43), control (8.67±2.31), and the demineralization (2.42±1.21) groups. Highest mean ARI scores were observed in Toothmin group (2.33±0.48) and the least in the demineralization group (0.4±0.507).Demineralization of enamel significantly reduces the SBS of orthodontic brackets. Remineralization of enamel with Toothmin or CPP-ACP after demineralisation improved bond strength. Highest mean ARI scores were observed in Toothmin group and lowest in demineralized group.