Journal article
In vitro fracture resistance of endodontically treated central incisors with varying ferrule heights and configurations
The Journal of prosthetic dentistry, Vol.93(4), pp.331-336
2005
DOI: 10.1016/j.prosdent.2005.01.013
PMID: 15798683
Abstract
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.
This in vitro study investigated the resistance to static loading of endodontically treated teeth with uniform and nonuniform ferrule configurations.
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 (α=.05). The mode of fracture was noted by visual inspection for all specimens.
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.
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.
Details
- Title: Subtitle
- In vitro fracture resistance of endodontically treated central incisors with varying ferrule heights and configurations
- Creators
- Philip L.B. Tan - Visiting Assistant Professor, Department of Family DentistrySteven A. Aquilino - Professor and Head, Department of ProsthodonticsDavid G. Gratton - Assistant Professor, Department of ProsthodonticsClark M. Stanford - Centennial Fund Professor, Dows Institute of Dental Research and Department of ProsthodonticsSwee Chian Tan - Assistant Professor, Department of ProsthodonticsWilliam T. Johnson - Professor and Head, Department of EndodonticsDeborah Dawson - Professor, Department of Preventive and Community Dentistry
- Resource Type
- Journal article
- Publication Details
- The Journal of prosthetic dentistry, Vol.93(4), pp.331-336
- DOI
- 10.1016/j.prosdent.2005.01.013
- PMID
- 15798683
- NLM abbreviation
- J Prosthet Dent
- ISSN
- 0022-3913
- eISSN
- 1097-6841
- Publisher
- Mosby, Inc
- Language
- English
- Date published
- 2005
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Endodontics; Biostatistics; Dentistry Administration; Prosthodontics; Orthopedics and Rehabilitation; Pediatric Dentistry; Craniofacial Anomalies Research Center; Oral and Maxillofacial Surgery; Hospital Dentistry
- Record Identifier
- 9984367622102771
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