MICROLEAKAGE OF CLASS II COMPOSITE RESTORATIONS WITH DIFFERENT RESTORATIVE TECHNIQUES (AN IN VITRO STUDY)

Abstract

INTRODUCTION: Microleakage has been regarded as a primary concern for the use of composites in class II cavity restorations. Many techniques have attempted to minimize this leakage.OBJECTIVES: The purpose of this in-vitro study was to evaluate the microleakage in class II cavities restored with composite resins applied with either incremental, bulk fill or Sonic fill techniques.MATERIALS AND METHODS: Forty sound human permanent lower molars extracted for periodontal problems. Occluso-mesial class II cavity was prepared in each tooth, with the cervical margin of the proximal box located 1 mm occlusal to the cemento-enamel junction (CEJ). The prepared teeth were randomly distributed to four groups with 10 specimens each (n=10). In each group, a self-etch adhesive was applied, followed by composite resin that was applied in either incremental, bulk fill or sonic fill technique; Group I: [Optibond all in one +Herculite XRV Ultra], Group II: [ Optibond all in one+ Premise flowable + Herculite XRV Ultra], Group III: [Single bond universal+Filtek bulkfill + Filtek Z250XT], Group IV: [ Optibond all in oneSonicFill]. All restored specimens were soaked in basic fuchsin dye for 24 hours, and sectioned mesiodistally to detect the extent of dye penetration by stereomicroscope. Data were collected and statistically analyzed.RESULTS: The cervical margins showed more microleakage than the occlusal margins. Sonicfill in Group IV recorded the lowest mean value of microleakage scores among the four groups occlusally (mean=0.10), whereas Premise Flowable + Hercuilte XRV Ultra in Group II showed the highest mean value (1.20) . Sonic fill in Group 1V recorded the lowest mean value of microleakage scores among the four groups cervically (mean= 0.80), whereas Premise Flowable + Hercuilte XRV Ultra in Group II showed the highest mean value (1.60). Kruskall-Wallis test proved no significant difference among groups. Mann Whitney test proved significant difference between Group II and Group IV occlusally.CONCLUSIONS: Sonic fill showed the best results in terms of marginal seal