Abstract: Objective To observe the clinical effects of glass fiber pile and liquid resin in severe wedge-shaped defect restorations of premolar and anterior teeth. Methods 72 cases with severe wedge-shaped defect of the premolar and anterior teeth were selected. After the treatment of root canal, 24 teeth were randomly divided into three groups: Group A(mobile resin repair group), Group B(Z350 mobile resin + glass fiber pile repair group) and Group C(Z350 mobile resin + glass fiber pile + full crown restoration group). Comparative observation was conducted under the unified evaluation criteria. Results After 2 years’ observation,there was significant difference between Group A and Group B (P<0.05) . And there was no significant difference between Group C and Group B (P>0.05) . Conclusion The fiber pile can significantly improve the strength of the residual dental tissue of the severe wedge-shaped defect, and significantly improve its anti-foldability. But there is no significant effect on the repair of the severe wedge defect with the full crown, which deserves further discussion.

Key words: wedge—shaped defect, Fiber pile, Flowable composite