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In vitro fracture resistance of endodontically treated central incisors with varying ferrule heights and configurations.
J Prosthet Dent. 2005 Apr; 93(4):331-6.JP

Abstract

STATEMENT OF PROBLEM

The in vitro effectiveness of a uniform circumferential ferrule has been established in the literature; however, the effect of a nonuniform circumferential ferrule height on fracture resistance is unknown.

PURPOSE

This in vitro study investigated the resistance to static loading of endodontically treated teeth with uniform and nonuniform ferrule configurations.

MATERIAL AND METHODS

Fifty extracted intact maxillary human central incisors were randomly assigned to 1 of 5 groups: CRN, no root canal treatment (RCT), restored with a crown; RCT/CRN, no dowel/core, restored with a crown; 2 FRL, 2-mm ferrule, cast dowel/core and crown; 0.5/2 FRL, nonuniform ferrule (2 mm buccal and lingual, 0.5 mm proximal), cast dowel/core and crown; and 0 FRL, no ferrule, cast dowel/core and crown. The teeth were prepared to standardized specifications and stored for 72 hours in 100% humidity prior to testing. Testing was conducted with a universal testing machine with the application of a static load, and the load (N) at failure was recorded. Statistical analysis was performed with a 1-way analysis of variance and the Tukey Honestly Significant Difference test (alpha=.05). The mode of fracture was noted by visual inspection for all specimens.

RESULTS

There was strong evidence of group differences in mean fracture strength (P <.0001). Following adjustment for all pairwise group comparisons, it was found that the lack of a ferrule resulted in a significantly lower mean fracture strength (0 FRL: 264.93 +/- 78.33 N) relative to all other groups. The presence of a nonuniform (0.5 to 2-mm vertical height) ferrule (0.5/2 FRL: 426.64 +/- 88.33 N) resulted in a significant decrease (P =.0001) in mean fracture strength when compared with the uniform 2-mm vertical ferrule (2 FRL: 587.23 +/- 110.25 N), the group without RCT (CRN: 583.67 +/- 86.09 N), and the RCT-treated tooth with a crown alone (CRN/RCT: 571.04 +/- 154.86 N). The predominant mode of failure was an oblique fracture extending from the lingual margin to the facial surface just below the insertion of the tooth into the acrylic resin.

CONCLUSION

The results demonstrated that central incisors restored with cast dowel/core and crowns with a 2-mm uniform ferrule were more fracture resistant compared to central incisors with nonuniform (0.5 to 2 mm) ferrule heights. Both the 2-mm ferrule and nonuniform ferrule groups were more fracture resistant than the group that lacked a ferrule.

Authors+Show Affiliations

Department of Family Dentistry, College of Dentistry, University of Iowa City, IA 52242-1001, USA. philip-l-tan@uiowa.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15798683

Citation

Tan, Philip L B., et al. "In Vitro Fracture Resistance of Endodontically Treated Central Incisors With Varying Ferrule Heights and Configurations." The Journal of Prosthetic Dentistry, vol. 93, no. 4, 2005, pp. 331-6.
Tan PL, Aquilino SA, Gratton DG, et al. In vitro fracture resistance of endodontically treated central incisors with varying ferrule heights and configurations. J Prosthet Dent. 2005;93(4):331-6.
Tan, P. L., Aquilino, S. A., Gratton, D. G., Stanford, C. M., Tan, S. C., Johnson, W. T., & Dawson, D. (2005). In vitro fracture resistance of endodontically treated central incisors with varying ferrule heights and configurations. The Journal of Prosthetic Dentistry, 93(4), 331-6.
Tan PL, et al. In Vitro Fracture Resistance of Endodontically Treated Central Incisors With Varying Ferrule Heights and Configurations. J Prosthet Dent. 2005;93(4):331-6. PubMed PMID: 15798683.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - In vitro fracture resistance of endodontically treated central incisors with varying ferrule heights and configurations. AU - Tan,Philip L B, AU - Aquilino,Steven A, AU - Gratton,David G, AU - Stanford,Clark M, AU - Tan,Swee Chian, AU - Johnson,William T, AU - Dawson,Deborah, PY - 2005/3/31/pubmed PY - 2005/5/13/medline PY - 2005/3/31/entrez SP - 331 EP - 6 JF - The Journal of prosthetic dentistry JO - J Prosthet Dent VL - 93 IS - 4 N2 - STATEMENT OF PROBLEM: The in vitro effectiveness of a uniform circumferential ferrule has been established in the literature; however, the effect of a nonuniform circumferential ferrule height on fracture resistance is unknown. PURPOSE: This in vitro study investigated the resistance to static loading of endodontically treated teeth with uniform and nonuniform ferrule configurations. MATERIAL AND METHODS: Fifty extracted intact maxillary human central incisors were randomly assigned to 1 of 5 groups: CRN, no root canal treatment (RCT), restored with a crown; RCT/CRN, no dowel/core, restored with a crown; 2 FRL, 2-mm ferrule, cast dowel/core and crown; 0.5/2 FRL, nonuniform ferrule (2 mm buccal and lingual, 0.5 mm proximal), cast dowel/core and crown; and 0 FRL, no ferrule, cast dowel/core and crown. The teeth were prepared to standardized specifications and stored for 72 hours in 100% humidity prior to testing. Testing was conducted with a universal testing machine with the application of a static load, and the load (N) at failure was recorded. Statistical analysis was performed with a 1-way analysis of variance and the Tukey Honestly Significant Difference test (alpha=.05). The mode of fracture was noted by visual inspection for all specimens. RESULTS: There was strong evidence of group differences in mean fracture strength (P <.0001). Following adjustment for all pairwise group comparisons, it was found that the lack of a ferrule resulted in a significantly lower mean fracture strength (0 FRL: 264.93 +/- 78.33 N) relative to all other groups. The presence of a nonuniform (0.5 to 2-mm vertical height) ferrule (0.5/2 FRL: 426.64 +/- 88.33 N) resulted in a significant decrease (P =.0001) in mean fracture strength when compared with the uniform 2-mm vertical ferrule (2 FRL: 587.23 +/- 110.25 N), the group without RCT (CRN: 583.67 +/- 86.09 N), and the RCT-treated tooth with a crown alone (CRN/RCT: 571.04 +/- 154.86 N). The predominant mode of failure was an oblique fracture extending from the lingual margin to the facial surface just below the insertion of the tooth into the acrylic resin. CONCLUSION: The results demonstrated that central incisors restored with cast dowel/core and crowns with a 2-mm uniform ferrule were more fracture resistant compared to central incisors with nonuniform (0.5 to 2 mm) ferrule heights. Both the 2-mm ferrule and nonuniform ferrule groups were more fracture resistant than the group that lacked a ferrule. SN - 0022-3913 UR - https://www.unboundmedicine.com/medline/citation/15798683/In_vitro_fracture_resistance_of_endodontically_treated_central_incisors_with_varying_ferrule_heights_and_configurations_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022391305000557 DB - PRIME DP - Unbound Medicine ER -