Study on the fracture resistance of preparation designs of occlusal veneer and fiber posts in pulp-penetrating wedge-shaped defects
10.19405/j.cnki.issn1000-1492.2023.10.031
- Author:
Yuqing Zhang
1
;
Ruting Chen
1
;
Guomin Wu
1
;
Hongyan Zhang
1
Author Information
1. Stomatological College of Anhui Medical University，The Affiliated Stomatological Hospital of Anhui Medical University，Anhui Province Key Laboratory of Oral Diseases Research，Hefei 230032; Dept of Dentistry and Pulp，The Affiliated Stomatological Hospital of Anhui Medical University，Hefei 230032
- Publication Type:Journal Article
- Keywords:
occlusal veneer;
wedge-shaped defect;
fracture load;
failure mode
- From:
Acta Universitatis Medicinalis Anhui
2023;58(10):1786-1792
- CountryChina
- Language:Chinese
-
Abstract:
Objective : To investigate the effects of different occlusal veneer preparation designs and fiber posts on the fracture load and failure mode of endodontically treated maxillary premolars with pulp-piercing wedge-shaped defect．
Methods : 60 maxillary first premolars were randomly divided into group A and group B after Root Canal Therapy (RCT) and severe defects(n = 30) ．Group A was filled with glass fiber post and resin core，and group B was filled with resin core only．Then the occlusal veneer( G2) ，buccal-occlusal veneer( G3) and buccal-proximal-occlusal veneer ( G4 ) were applied to the isolated teeth．The teeth filled with composite resin ( G1 ) and full crown ( G5) were set as negative and positive control respectively，with 6 samples in each group．The sample was subjected to 5 000 hot and cold cycles and 20 000 vertical compression load aging．Finally，all the samples were loaded with static load until the sample broke at the speed of 0．5mm / min．The fracture load and failure mode of each sample were recorded.
Results : Both the fracture load in group A and B was G5 ＞G3 ＞G2 ＞G4 ＞G1，and the fracture load in G2，G3，G4，G5 was significantly higher than that in G1 (P＜0. 05) ，and there was no significant difference between group A and B (P＞0. 05) ．The fracture form of G3 was mostly unbonding of the repair body，which was conducive to re-repair．
Conclusion :Buccal ( occlusal) veneer is the most effective in repairing pulp-piercing wedge-shaped defects．The fiber post could not significantly enhance the fracture load of the pulp-piercing wedge- shaped defects teeth.
- Full text:2024071611064042133(牙合)贴面的预备设计和纤...对穿髓型楔状缺损抗折性分析_张雨晴.pdf
