“Comparison of In-Vitro Bond Strengths Between Orthodontic Light Cure Composite Resin and Resin Modified Glass Ionomer Cement after Fluoride Application using Custom made Bond Strength Measuring Device”

Abstract

One tenet of successful orthodontic therapy is to complete treatment without repeated bond failure and decalcification. Fluoride application reduces demineralisation of enamel. Use of glass ionomers for orthodontic bonding has long been a topic of debate. The purpose of this study was to compare the bond strengths of Resin Modified Glass Ionomer Cement and Composite resins after Fluoride application.40 human premolars were immersed in 1.23% APF gel for 4 min.s . 1 st group was bonded using Light cure Composite resin (Amber -Jaipur Orthodontics) and 2 nd group using Resin modified glass ionomer cement (GC Fuji Ortho TM ). The Universal Testing Machine has been the age old standard for bond strength measurement. However its unavailability and cost incurred in getting samples tested is a major hindrance in research activities on this front, particularly for the Post Graduate students where majority of thesis are based on Bond strength measurements. Keeping this in mind, a Bond strength measuring machine was indigenously developed and Bond strength was tested on it. Students 't' test showed significantly higher bond strength of composite as compared to resin modified glass ionomer. After fluoride application resin modified glass ionomer cement showed reduced bond strength then composite resin. The device described here can be a cheaper alternative for institutional setups.