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https://hdl.handle.net/2440/44407
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Type: | Journal article |
Title: | Effect of a ferrule and increased clinical crown length on the In Vitro fracture resistance of premolars restored using two dowel-and-core systems |
Author: | Meng, Q. Chen, Y. Guang, H. Yip, K. Smales, R. |
Citation: | Operative Dentistry, 2007; 32(6):595-601 |
Publisher: | Operative Dentistry Inc |
Issue Date: | 2007 |
ISSN: | 0361-7734 1559-2863 |
Abstract: | This study investigated the effect of a crown-lengthening ferrule on the fracture resistance of endodontically-treated teeth restored with two dowel-core systems. Thirty-two extracted mandibular first premolars were sectioned perpendicular to the long axis at a point 1.0 mm occlusal to the buccal cementoenamel junction. Following endodontic treatment, the teeth were randomly assigned to four groups: cast Ni-Cr alloy dowel-core with no ferrule (Group A1), cast Ni-Cr alloy dowel-core with 2.0 mm ferrule (Group A2), prefabricated carbon fiber-reinforced dowel-resin core with no ferrule (Group B1) and carbon fiber-reinforced dowel-resin core with 2.0 mm ferrule (Group B2). Each specimen was embedded in a self-cured acrylic resin block from 2.0 mm apical to the margins of a cast Ni-Cr alloy crown, then loaded at 150 degrees from the long axis in a universal testing machine at a crosshead speed of 1.0 mm/minute until fracture. The data were recorded and analyzed using ANOVA and Fisher's exact tests, with alpha = 0.05. Mean failure loads (kN) for the A1, A2, B1 and B2 Groups were: 1.46 (S.D. 0.45), 1.07 (0.21), 1.13 (0.30) and 1.02 (0.27). The teeth restored with cast Ni-Cr dowel-cores and 2.0 mm ferrules demonstrated significantly lower fracture strengths, p = 0.04. There were significant differences in the root fracture patterns between the two dowel systems, with the carbon fiber-reinforced dowel-resin core system, being the less severe p < 0.05. Crown lengthening with a 2.0 mm apical extended ferrule resulted in reduced fracture strengths for endodontically-treated teeth restored using two dowel-core systems and cast metal crowns. The carbon fiber-reinforced dowel-resin core system reduced the severity of the root fractures. |
Keywords: | Bicuspid Humans Tooth, Nonvital Tooth Fractures Analysis of Variance Crown Lengthening Post and Core Technique Tooth Preparation Adult |
DOI: | 10.2341/06-169 |
Description (link): | http://www.jopdent.org/journal/articles/files/Volume_32__2007.php#num6 |
Published version: | http://dx.doi.org/10.2341/06-169 |
Appears in Collections: | Aurora harvest 6 Dentistry publications |
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