Diametral tensile strength of a resin composite core with nonmetallic prefabricated posts: an in vitro study

A number of prefabricated nonmetallic posts are currently available for use in conjunction with resin composite cores before fabrication of crowns for endodontically treated teeth. Information is needed regarding the strength of the composite and the nature of attachment between its components. The...

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Bibliographic Details
Published in:The Journal of prosthetic dentistry 2004-04, Vol.91 (4), p.335-341
Main Authors: Coelho Santos, Gildo, El-Mowafy, Omar, Hernique Rubo, Jose
Format: Article
Language:English
Subjects:
Analysis of Variance
Bisphenol A-Glycidyl Methacrylate
Composite Resins
Crowns
Dental Stress Analysis
Dentistry
Epoxy Resins
Glass
Materials Testing
Microscopy, Electron, Scanning
Post and Core Technique - instrumentation
Quartz
Stainless Steel
Statistics, Nonparametric
Tensile Strength
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Summary:A number of prefabricated nonmetallic posts are currently available for use in conjunction with resin composite cores before fabrication of crowns for endodontically treated teeth. Information is needed regarding the strength of the composite and the nature of attachment between its components. The aim of this study was to determine the influence of different types of posts on the fracture resistance of a resin composite core material using the diametral tensile strength (DTS) test. Cylindrical specimens, 6 mm in diameter and 3 mm high, were prepared from resin composite (Tetric Ceram) and a group of prefabricated posts (n = 10) as follows: resin composite only (control); Vectrispost (VTS); FiberKor (FKR); Æstheti-Plus post (ATP); Light-Post (LTP); Dentorama post (DRM), and Para-Post (PRP) as a second control. Specimens were stored for 7 days in water at 37°C and then subjected to DTS test in a universal testing machine until failure occurred and load was recorded (N). Mean values and SD for DTS values (MPA) were calculated, and data were analyzed statistically with 1-way analysis of variance, followed by the Tukey test (α = .05). Representative specimens from each group were examined with SEM to determine nature of failure. Mean values (SD) in MPa for DTS were as follow: Control group: 49.64 (3.36); VTS: 29.77 (3.36); FKR: 31.9 (2.39); ATP: 28.92 (2.2); LTP: 34.26 (3.37); DRM: 33.45 (2.46), and PRP: 27.90 (2.40). Analysis of variance indicated significant differences among the groups ( P
ISSN:0022-3913
1097-6841
DOI:10.1016/j.prosdent.2004.01.017