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[An experimental study on fracture resistance of metal-ceramic crowned incisors with different post-core systems].
Zhonghua Kou Qiang Yi Xue Za Zhi. 2007 Mar; 42(3):169-72.ZK

Abstract

OBJECTIVE

To evaluate fracture resistance of metal-ceramic crown restored incisors with different post-and-core systems.

METHODS

Selected 40 intact maxillary central incisors were endodontically treated and then randomly assigned to four groups of 10 teeth each. Teeth in Group A were prepared to root canal with 10 mm in length, 1.6 mm in diameter and restored with fiber-reinforced posts and composite cores. Same final preparation but root canal with 1.5 mm in diameter was achieved for teeth in the other three groups. Teeth in Group B were restored with prefabricated titanium alloy posts and composite cores and teeth in Group C were restored with cast nickel-chromium post-cores. The posts were luted with a composite resin luting system, and metal-ceramic crowns were restored and cemented with the same luting system for all of the teeth in Group A, B and C. The other 10 teeth were restored with cast nickel-chromium post-cores and metal-ceramic crowns as a control, which were cemented with glass-ionomer cement. All restored teeth were thermo-cycled for 5000 cycles (5 degrees C/55 degrees C) as a fatigue test. The tooth was loaded in a universal testing machine at an angle of 135 degrees to the long-axis at the incisal edge with a cross-head speed of 1.5 mm/min until fracture. Fracture loads (N) and modes (repairable or catastrophic) were recorded. One-way ANOVA and SNK test were used to determine the significance of the failure loads between groups. Chi-square test was conducted for evaluation of the fracture mode.

RESULTS

The fracture loads from Group A, B, C and control group were (534.4 +/- 145.7) N, (499.8 +/- 168.9) N, (412.6 +/- 99.3) N, (337.4 +/- 121.2) N, respectively. A significant difference was existed among four groups (P < 0.05). The fracture loads of Group A and Group B were significantly higher than control group (P < 0.05). The repairable mode of fracture observed from Group A to control group was 80%, 40%, 20% and 30%, Group A had a significantly higher number of repairable fractures than those of the other groups (P < 0.05).

CONCLUSIONS

Within the limitations of this study, fiber-reinforced post has an excellent fracture resistance, and can be recommended as an alternative to cast post-cores, especially for incisor esthetic restoration.

Authors+Show Affiliations

Center of Stomatology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China. guxinhua@mail.hz.zj.cnNo affiliation info availableNo affiliation info available

Pub Type(s)

English Abstract
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

chi

PubMed ID

17565828

Citation

Gu, Xin-hua, et al. "[An Experimental Study On Fracture Resistance of Metal-ceramic Crowned Incisors With Different Post-core Systems]." Zhonghua Kou Qiang Yi Xue Za Zhi = Zhonghua Kouqiang Yixue Zazhi = Chinese Journal of Stomatology, vol. 42, no. 3, 2007, pp. 169-72.
Gu XH, Huang JP, Wang XX. [An experimental study on fracture resistance of metal-ceramic crowned incisors with different post-core systems]. Zhonghua Kou Qiang Yi Xue Za Zhi. 2007;42(3):169-72.
Gu, X. H., Huang, J. P., & Wang, X. X. (2007). [An experimental study on fracture resistance of metal-ceramic crowned incisors with different post-core systems]. Zhonghua Kou Qiang Yi Xue Za Zhi = Zhonghua Kouqiang Yixue Zazhi = Chinese Journal of Stomatology, 42(3), 169-72.
Gu XH, Huang JP, Wang XX. [An Experimental Study On Fracture Resistance of Metal-ceramic Crowned Incisors With Different Post-core Systems]. Zhonghua Kou Qiang Yi Xue Za Zhi. 2007;42(3):169-72. PubMed PMID: 17565828.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [An experimental study on fracture resistance of metal-ceramic crowned incisors with different post-core systems]. AU - Gu,Xin-hua, AU - Huang,Jian-ping, AU - Wang,Xiao-xiang, PY - 2007/6/15/pubmed PY - 2010/6/30/medline PY - 2007/6/15/entrez SP - 169 EP - 72 JF - Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology JO - Zhonghua Kou Qiang Yi Xue Za Zhi VL - 42 IS - 3 N2 - OBJECTIVE: To evaluate fracture resistance of metal-ceramic crown restored incisors with different post-and-core systems. METHODS: Selected 40 intact maxillary central incisors were endodontically treated and then randomly assigned to four groups of 10 teeth each. Teeth in Group A were prepared to root canal with 10 mm in length, 1.6 mm in diameter and restored with fiber-reinforced posts and composite cores. Same final preparation but root canal with 1.5 mm in diameter was achieved for teeth in the other three groups. Teeth in Group B were restored with prefabricated titanium alloy posts and composite cores and teeth in Group C were restored with cast nickel-chromium post-cores. The posts were luted with a composite resin luting system, and metal-ceramic crowns were restored and cemented with the same luting system for all of the teeth in Group A, B and C. The other 10 teeth were restored with cast nickel-chromium post-cores and metal-ceramic crowns as a control, which were cemented with glass-ionomer cement. All restored teeth were thermo-cycled for 5000 cycles (5 degrees C/55 degrees C) as a fatigue test. The tooth was loaded in a universal testing machine at an angle of 135 degrees to the long-axis at the incisal edge with a cross-head speed of 1.5 mm/min until fracture. Fracture loads (N) and modes (repairable or catastrophic) were recorded. One-way ANOVA and SNK test were used to determine the significance of the failure loads between groups. Chi-square test was conducted for evaluation of the fracture mode. RESULTS: The fracture loads from Group A, B, C and control group were (534.4 +/- 145.7) N, (499.8 +/- 168.9) N, (412.6 +/- 99.3) N, (337.4 +/- 121.2) N, respectively. A significant difference was existed among four groups (P < 0.05). The fracture loads of Group A and Group B were significantly higher than control group (P < 0.05). The repairable mode of fracture observed from Group A to control group was 80%, 40%, 20% and 30%, Group A had a significantly higher number of repairable fractures than those of the other groups (P < 0.05). CONCLUSIONS: Within the limitations of this study, fiber-reinforced post has an excellent fracture resistance, and can be recommended as an alternative to cast post-cores, especially for incisor esthetic restoration. SN - 1002-0098 UR - https://www.unboundmedicine.com/medline/citation/17565828/[An_experimental_study_on_fracture_resistance_of_metal_ceramic_crowned_incisors_with_different_post_core_systems]_ L2 - http://journal.yiigle.com/LinkIn.do?linkin_type=pubmed&amp;issn=1002-0098&amp;year=2007&amp;vol=42&amp;issue=3&amp;fpage=169 DB - PRIME DP - Unbound Medicine ER -