Influence of fiber posts on the fracture resistance of endodontically treated premolars with different dental defects.
- Author:
Qian-Qian HOU
1
;
Yi-Ming GAO
;
Lei SUN
Author Information
- Publication Type:Journal Article
- MeSH: Analysis of Variance; Bicuspid; Composite Resins; Dental Restoration Failure; Dental Stress Analysis; Dentin; physiology; Humans; Post and Core Technique; Quartz; Tooth Fractures; prevention & control; Tooth, Nonvital
- From: International Journal of Oral Science 2013;5(3):167-171
- CountryChina
- Language:English
- Abstract: This study aimed to evaluate the influence of quartz fiber post placement on the fracture resistance of endodontically treated premolars with different dental defects under dynamic loading. Fifty extracted single-rooted mandibular premolars were randomized into five groups. Each group was prepared according to numbers of residual walls ranged from 0 to 4. Then each group was divided into two subgroups with one restored with quartz fiber posts and the other without posts. In no-post groups, gutta percha point 2 mm below cemento-enamel junction was removed. Composite resin was adapted to the well and used to shape the core directly. Each tooth was restored with a complete metal crown. Dynamic loading was carried out in a masticatory simulator with a nominal load of 50 N at 2 Hz for 300 000 loading cycles. Then a quasi-statically load was applied in a universal testing machine 30° to the long axis with a crosshead speed of 1 mm⋅min(-1) until fracture. Data were analyzed with one-way analysis of variance and pairwise comparison (P<0.05). No specimens failed during dynamic loading. The fracture resistance enhanced with the increase of numbers of coronal walls and the differences were significant (P<0.05). Placement of fiber posts had a significant effect when fewer than two walls remained (P<0.05), but it had no significant influence in groups with two, three or four walls (P>0.05). Fiber post did not change failure mode, and the fracture pattern was mainly favorable. More dentin walls need to be retained in clinic. When no less than two walls remained, a fiber post is not always necessary.
