Effect of the design of prefabricated post heads on various core materials
Date
1991
DOI
Authors
Cheng, Wen-Cheng
Version
OA Version
Citation
Abstract
The effects and interdependence of core materials, core thickness covering the post head, and the design of post heads of prefabricated posts on compressive and tensile failure loads of core build-ups were studied. Three hundred sixty (360) standardized specimens consisting of combinations of the following groups of variables were made: prefabricated post systems (Flexi-post, Para-post, and Unity post); core covering thickness (1 mm and 3 mm); and core materials (amalgam, composite, and titanium reinforced composite). Compressive and tensile failure loads were measured, in the absence of crowns, using the lnstron test machine. The mean values of 1O samples of each combination were analyzed using ANOVA and Newman-Keuls tests. Although the compressive tests revealed no statistically confirmable interactions between variables the compressive failure loads were affected by each single factor. For example, amalgam yielded the best compressive failure load within the core material group. In the tensile tests however, statistical interactions between post types and core materials, and between post types and core covering thickness were found. For some posts (Flexi-post and Para-post) amalgam was the core material of choice, whereas for another (Unity post) composite was more suitable. The inclusion of titanium as reinforcement filler in composite core material does not provide significantly improved resistance to either compressive or tensile forces. Longer post heads appeared to be less susceptible to tensile failure.
Description
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1991 (Prosthodontics)
Bibliography: leaves 61-65.
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1991 (Prosthodontics)
Bibliography: leaves 61-65.
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.