Abstract
The aim of this study is to investigate the effect of different fluoride release restorative materials (resin modified glass ionomer, composite resin and conventional type of glass ionomer) on fracture resis-tance of the restored teeth.Forty recently extracted human maxi-llary premolar teeth were used in this stu-dy. The teeth were mounted in acrylic re-sin inside a plastic ring by the use of a surveyor.The specimen randomly divided into five groups: Group A: Five intact teeth; Group B: Five teeth prepared but not restored; Group C: Ten teeth restored with resin modified glass ionomer (Vitremer); Group D: Ten teeth restored with compo-site resin (Tetric); and Group E: Ten teeth restored with conventional type of glass ionomer (Ionofil).Class II mesio–occluso–distal cavity preparation was made for the teeth of Groups B through E.The specimens were thermocycled (5 ºC to 55 ºC) for 100 cycles, stored for one week at 37 ºC in distilled water and then fractured by occlusal force.The statistical analysis of the results showed that resin modified glass ionomer and composite resin significantly increase the resistance of prepared teeth to fracture.
