Research was undertaken in order to functionally test the reinforcement capabilities of several commonly used, standard manufactured posts. One hundred and ten maxillary lateral incisors were mounted in plastic, reinforced with the posts at different levels, and then restored with standardized crowns. These teeth along with control groups, were then placed in a custom, mounting jig which properly positioned them for the stress testing. The forces required for fracturing these teeth were recorded and subsequently analyzed.
The statistical analysis of the experimental results demonstrated that posts do not reinforce teeth as supposed; they may, in fact, weaken them. Analysis also demonstrated that the depth of post insertion is a significant factor in support, as is the remaining dentin thickness between the post apex and the outer surface of the root on the mesial and distal. Of all of the posts and depths tested, none came close to the natural tooth and few supported loads as well as endodontically treated intact teeth with no reinforcement.
The best approximation of support came from Para-Post system reinforcement, placed at the 10 millimeter depth. The use of a reinforcing rod in intact teeth was found to be a needless procedure.
Donald L. Brewer
Raleigh R. Cummings
William L. Young
Master of Science (MS)
Year Degree Awarded
Date (Title Page)
Library of Congress/MESH Subject Headings
Dental Restoration, Permanent; Crowns
2 vi; 83
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This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.
Bravin, Robert V., "The Functional Stress Analysis of Post Reinforcement" (1976). Loma Linda University Electronic Theses, Dissertations & Projects. 1286.
Loma Linda University Electronic Theses and Dissertations
Loma Linda University. Del E. Webb Memorial Library. University Archives