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
,
2
;
Ruting Chen
1
,
2
;
Guomin Wu
1
,
2
;
Hongyan Zhang
1
,
2
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
2. 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
