The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

AN ANALYSIS OF FAILURE MODE OF TEETH RESTORED WITH FIBER-REINFORCED POSTS UNDER THE CONDITION OF BONY RESORPTION

치주지지가 감소된 상태에서 섬유강화형 포스트로 수복한 치아의 실패양상 분석

  • Lee Byung-Woo (Research Institute of Oral Science, College of Dentistry, Kangnung National University) ;
  • Yi Yang-Jin (Research Institute of Oral Science, College of Dentistry, Kangnung National University) ;
  • Cho Lee-Ra (Research Institute of Oral Science, College of Dentistry, Kangnung National University) ;
  • Park Chan-Jin (Research Institute of Oral Science, College of Dentistry, Kangnung National University)
  • 이병우 (강릉대학교 치과대학 치과보철학교실, 강릉대학교 구강과학연구소) ;
  • 이양진 (강릉대학교 치과대학 치과보철학교실, 강릉대학교 구강과학연구소) ;
  • 조리라 (강릉대학교 치과대학 치과보철학교실, 강릉대학교 구강과학연구소) ;
  • 박찬진 (강릉대학교 치과대학 치과보철학교실, 강릉대학교 구강과학연구소)
  • Published : 2003.04.01
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Abstract

Statement of problem : Fiber-reinforced posts have lower modulus of elasticity than titanium post or cast post-core. With this similar elasticity to that of dentin, fiber-reinforced posts have been known to have a tendency to reduce the risk of root fracture. However, there were few studies on the teeth restored with fiber-reinforced posts under the condition of reduced periodontal support. Purpose : The purpose of this study was to evaluate the fracture strength and failure mode of endodontically treated teeth restored with fiber-reinforced posts and titanium posts under the condition of reduced periodontal support. Material and method : Extracted human maxillary incisor roots were divided into 3 groups (group 1 carbon fiber post, group 2 : glass fiber post, and group 3 : titanium alloy post). After coronectomy and endodontic treatment, teeth were restored with each post systems and resin core according to the manufacturer's recommendation. Then, teeth with simulated periodontal ligament were embedded in the acrylic resin blocks at the level of 4 mm below the cemento-enamel junction. Each specimen was exposed to $10^5$ load cycles with average 30 N force in $36.5^{\circ}C$ water using a computer-controlled chewing simulator. Loads were applied at $45^{\circ}$ angle to the long axis of the teeth. After cyclic loading, teeth were subjected a compressive load until failure at a crosshead speed of 0.5 mm/min. Fracture strength (N) and failure mode were examined. The fracture strength was analyzed with one-way ANOVA and the Scheffe adjustment at the 95% significance level. Results and conclusion : The results were as follows. 1. There was no statistically significant difference in the mean fracture strength among the groups (P<.05). 2. Carbon fiber post and glass fiber post group showed less root fracture tendency than control group. 3. All specimens with root fractures showed fracture lines above the level of acrylic resin block, except for only one specimen in group 3.

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