| Abstract | OBJECTIVES: The present study was designed to test the null hypothesis that there is no difference in the fracture resistance of pulpless teeth restored with different types of post-core systems and full coverage crowns. METHODS: Extracted human upper premolars were restored with a fiber post, prefabricated metallic post or cast metallic post-core. Teeth with full crown preparations without post-core restorations served as a control. All teeth were restored with full coverage crowns. A 90-degree vertical or 45-degree oblique load was applied to the restored teeth with a crosshead speed of 0.5 mm/min, and the fracture loads and mode of fracture were recorded. RESULTS: Under the condition of vertical loading, the fracture load of teeth restored with the cast metallic post-cores was greatest among the groups (two-factor factorial ANOVA and Scheffe's F test, P<0.05). All fractures in teeth restored with all types of post-core systems propagated in the middle portions of roots, including the apices of the posts. Under the condition of oblique loading, the fracture load of teeth restored with pre-fabricated metallic posts was significantly smaller than that in other groups. Two-thirds of fractures in the fiber post group propagated within the cervical area, while most fractures in other groups extended beyond the middle of the roots. SIGNIFICANCE: From the results of the present investigations, it was concluded that under the conditions of vertical and oblique loadings, the combination of a fiber post and composite resin core with a full cast crown is most protective of the remaining tooth structure. |
| Authors | Mikako Hayashi, Yutaka Takahashi, Satoshi Imazato, Shigeyuki Ebisu
(Affiliation: Department of Restorative Dentistry and Endodontology, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan. mikarin at dent.osaka-u.ac.jp)
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| Journal | Dental materials : official publication of the Academy of Dental Materials
(Dent Mater)
Vol. 22
Issue 5
Pg. 477-85
(May 2006)
ISSN: 0109-5641 England |
| PMID | 16171857
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
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| Chemical References |
- Composite Resins
- Gold Alloys
- Metals
- Stainless Steel
- Quartz
|
| Topics |
- Analysis of Variance
- Bicuspid
- Cementation
- Composite Resins
- Crowns
- Dental Casting Technique
- Dental Restoration Failure
- Dental Stress Analysis
- Gold Alloys
- Humans
- Materials Testing
- Metals
- Post and Core Technique
- Quartz
- Stainless Steel
- Statistics, Nonparametric
- Tooth Fractures
(prevention & control)
- Tooth, Nonvital
|
