Clinical comparative study on anti-fracture effects of fiber post in severe wedge-shaped defect

WANG Qin-bo; DAI Rong-feng

Abstract：Objective:Based on the potential risk of the weakness of the severe wedge-shaped defect with exposed pulp, to evaluate the clinical efficacy of cervical anti-fracture resistance using different techniques. Methods: 48 patients, 20 males and 28 females, aged between 45 to 73 years old, with severe wedge-shaped defect, exposed pulp, and intact occlusal surfaces were enrolled to this study. 28 cases were the first premolar (19 cases maxillary and 9 cases mandibular). 9 cases were the second premolar (6 cases maxillary and 3 cases mandibular). 11 cases were the canines (8 cases maxillary and 3 cases mandibular). After root canal treatment, all the cases were randomly divided into A and B groups with 24 teeth each, and restored with two different kinds of restorations. In group A the defect was only restored by Filtek Z350 XT nano resin;while in group B the defect was first bonded with root canal fiber post followed by treatment described in group A. Results:After two years’ clinical observation, 6 cases of neck fracture were found in group A, while no neck fracture occurred in group B. Statistical significance were found between two groups, indicating that fiber post restoration can strengthen cervical anti-fracture resistance ( χ2=4.68, P<0.05 ). Conclusion: When one end of the fiber post was bonded in the root canal, and the other end was bonded to the crown, the post, resin and the entire tooth (crown and root) will become an integrated unit. It will not only improve the retention of the restoration, but also further enhanced cervical anti-fracture resistance. This is a kind of reasonable, minimally invasive restoration for tooth neck, better reflecting the overall repair concept.