Effect of handpiece LED and glass ionomer base on intact dentin removal during endodontic re-access for endodontic treated teeth using microct analysis

Abstract

INTRODUCTION: Removal of restorative material and eventual removal of dentin should be a concern in cases of re-access for endodontic retreatment. The objective of this study was to evaluate the intact dentin removal on the surrounding walls and on the floor of the pulp chamber on molar teeth influenced by type of the direct restoration and illumination during cavity. METHODS: 12 maxillary intact molar received occlusal root canal access and were endodontic treated by using rotatory instrumentation and root canal filling using AH Plus (Dentsply). Half of the samples were restored by using bulk fill flowable composite resin (Opus Bulk Fill Flow, FGM) for filling dentin structure and conventional composite resin (Opallis, FGM) for restored occlusal access. The other half, the teeth were restored using conventional glass ionomer (Maxion R, FGM) for filling the pulp chamber (1.5mm) and conventional composite resin (Opallis, FGM). Half the samples were re-accessed using highspeed handpiece with or without the use of UV light. The teeth were scanned by using microCT before and after the root canal re-access and the dentin accidentally removal was evaluated. The dentin removal was classified regarding the dentin removal on pulp chamber base dentin or lateral dentin. RESULTS: No significant was observed regarding lateral dentin after re-intervention cavity irrespective on the restorative protocol or illumination process. However, the use of glass ionomer cement reduce the dentin accidently removed on the floor of the pulp chamber. CONCLUSIONS: The use of the high speed handpiece with violet light had no effect for avoid dentin removal on lateral walls and the base of the pulp floor. However the use of conventional glass ionomer reduce the dentin accidently removed on the floor of pulp chamber.