Relationship between mechanical properties of fiber resin post-core system and different dental remaining tissues
10.3969/j.issn.2095-4344.2015.25.020
- VernacularTitle:纤维树脂桩核修复体力学性能与不同牙体剩余量的关系
- Author:
Min GU
- Publication Type:Journal Article
- Keywords:
Post and Core Technique;
Dental Stress Analysis;
Dental Prosthesis
- From:
Chinese Journal of Tissue Engineering Research
2015;(25):4038-4042
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND:The dental remaining tissue is closely related to fracture resistance ability of the fiber resin post. OBJECTIVE:To compare the effect of different dental remaining tissues on fatigue resistance of the fiber resin post using in vitro stress analysis method. METHODS:A total of 36 single rooted mandibular premolars were randomly divided into four groups. Upon finishing standardized root canal therapy, tooth preparation was performed on al four groups. Group A:transverse grinding of the crown on datum plane. Group B:coronal oblique distal, middle and proximal defects with the dentin col ar height of 2 mm at the distal end, and dentin col ar height of 0 mm when gradual y reduced to the proximal end. Group C:transverse missing of dental crown, leaving healthy dentin with 2 mm. Group D:retention of complete dental tissues on the dental crown. Routine bonding treatment was performed after the preparation in each group, and the Para post fiber lux glass fiber post was then implanted. Dynamic mechanical loading equipment was used to analyze the fracture resistance value of the four groups. RESULTS AND CONCLUSION:The loading value was as fol ows:Group D>Group C>Group B>Group A, and significant differences were found between two groups (P<0.05). The four model fracture forms were as fol ows:coronal oblique fracture, dental cervix transverse fracture, tooth cervical oblique fracture and root fracture. In the Group A, there were seven cases of dental cervix transverse fracture and two cases of oblique fracture. In the Group B, there were four cases of coronal oblique fracture and five cases of oblique fracture of dental cervix. In the Group C, there were six cases of oblique fracture of dental cervix and three cases of root fracture. In the Group D, there were seven cases of oblique fracture of dental cervix and two cases of root fracture. The result explains that the occlusal stress wil be transferred from cervix to the root when there are enough remaining dental tissues;overal levels reduce, and the strength of fiber post increases. Therefore, it is suggested clinical y to save as much dental tissues as possible.
