In vitro characterization of esthetic endodontic posts
Date
2000
DOI
Authors
Al-harbi, Fahad Ahmed
Version
OA Version
Citation
Abstract
Several new esthetic post systems are currently available for the restoration of endodontically treated teeth. These post systems enhance the esthetic quality of all-ceramic restorations better than metallic post systems. This study compares the mechanical and retentive properties of resin post systems: Fibrekor (FR) - Jeneric/Pentron; Luscent (LU) - Dentatus; and ceramic posts: Cerapost (CR)- Brassier; Cosmopost (CO) - Ivoclar; and Titanium Parapost XH (Ti) - Coltene/Whaledent. As well, it studies the effect of these post systems on root fracture.
MATERIALS AND METHOD.
PART I: A 3-point bending test was performed on each system to calculate the flexural strength and modulus of elasticity.
PART II: Core retention was tested by forming BisCor (Bisco) resin cores around posts using a special mold then separate them using an Instron Testing Machine.
PART III: Seventy-two extracted human canines were endodontically treated and post spaces prepared, then 9.0 mm posts were cemented with C& resin cement (Bisco). An additional group of Ti was cemented with zinc phosphate cement as a control group. Then retention was tested using an Instron Testing Machine to separate the posts from teeth. The tensile load and strength were measured.
PART IV: Sixty-six extracted human canines were endodontically treated and divided into seven groups: negative control (no post ( natural crown), positive control (Ti post / natural crown), Ti test (Ti post / core / Artglass AG crown), LU (LU post / core / AG crown), FR (FR post / core / AG crown), CR (CR post I core / AG crown), and CO (CO post / core / AG crown). All specimens were mounted in acrylic resin blocks then load was applied at 135° using the Instron Testing Machine. Locations of fracture were recorded. One-way analysis of variance and Student Newman-Keuls tests were conducted for statistical analysis. Correlation analysis was done between root fracture and posts' elastic modulus.
PART V: Radiographs were taken for specimens before and after posts placement into teeth in order to verify seating and to configure the radio-opacity of posts.
RESULTS. Flexural strength of LU is higher than FR (p[less than]0.0001). The moduli of ceramic posts are higher than Ti. Core retention of Ti is higher than all esthetic posts (p[less than]0.0001) but FR is the best of other esthetic posts. Resin posts have better retention and tensile strength to tooth than ceramic posts (p[less than]0.0001). Different posts do not affect the likelihood of tooth fracture. There is a strong positive correlation (+0.86) between posts' elastic modulus and root fracture of teeth. Ceramic posts are radio-opaque and can be seen on radiographic films better than composite posts, which are radio-lucent.
CONCLUSION. Fibrekor post system can retain composite core buildup better than other esthetic post systems. Composite resin post systems have better tensile strengths to tooth than ceramic post systems. In vitro loading of restored teeth to fracture resulted in a significantly higher percentage of root fractures in the groups restored with ceramic posts.
Description
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Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Dental Medicine, 2000 (Restorative Science).
Includes bibliographical references (leaves 96-102).
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Dental Medicine, 2000 (Restorative Science).
Includes bibliographical references (leaves 96-102).
License
This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.