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Media type:
E-Article
Title:
A laboratory pilot study on voids in flowable bulk-fill composite restorations in bovine Class-II and endodontic access cavities after sonic vibration
Description:
<jats:title>Abstract</jats:title><jats:p>This pilot study investigated whether sonic-powered application of a bulk-fill resin-based composite (RBC) in Class-II or endodontic access cavities reduces void formation. The crowns and roots of 60 bovine teeth with Class-II cavities (C) and endodontic access cavities (E) respectively, were assigned to ten groups (C1–C5, E1–E5). Cavities were filled with RBC (SDR flow + , one increment) using different application techniques: no adaptation (C1 + E1), spreading of RBC on the cavity surfaces with a dental explorer tip (C2 + E2), low (C3 + E3) or high frequency (C4 + E4) direct activation by inserting a sonic-powered tip into RBC and high frequency indirect activation with an ultrasonic insertion tip (C5 + E5). The restorations were light-cured and investigated for voids using microtomography. The number of voids and percentage of voids related to the volume were statistically analysed (<jats:italic>α</jats:italic> < 0.05). While most voids in Class-II restorations were observed in C4 (<jats:italic>p</jats:italic> ≤ 0.0031), no significant differences were found between the other groups (<jats:italic>p</jats:italic> > 0.05). The percentage of voids showed no differences in E1-E5 (<jats:italic>p</jats:italic> > 0.05). C4 showed a significantly higher percentage of voids compared to C2 (<jats:italic>p</jats:italic> < 0.001). There is no benefit in applying sonic vibration when filling Class-II or endodontic access cavities.</jats:p>