Document Detail

Stresses created by occlusal prematurities in a new photoelastic model system.
MedLine Citation:
PMID:  1065691     Owner:  NLM     Status:  MEDLINE    
A new photoelastic model system incorporating a simulated periodontal ligament sleeve around an experimental first molar has been developed. The system was used to visualize internal compressive stresses created by various premature occlusal incline relationships in both buccolingual and mesiodistal dimensions. When prematurities were applied singly and observed buccolingually, both class 1 and and class 2 prematurities produced stresses along the lingual aspect of the root, whereas the class 3 prematurity produced stresses along the buccal aspect of the root. When viewed buccolingually, combinations of class 1 and class 2 prematurities resulted in stresses along the lingual aspect of the root. The stress pattern was similar to those created by the single class 1 or class 2 prematurities. A combination of class 2 and class 3 prematurities did not produce a well-defined indication of stress distribution. There was slightly more stress along the buccal aspect of the root. Comparison of this combination with individual class 2 and class 3 prematurities indicates that such a combination tended to diminish tipping of the tooth in any one direction. A combination of class 1 and class 3 prematurities showed slightly greater stress along the buccal aspect of the root surface. Again, the combination produced less tipping of the tooth in any one direction when compared with tipping caused by the individual prematurities. When all three prematurities were tested at the same time, the stress pattern was almost coincident with that achieved in the absence of prematurities. When prematurities were observed mesiodistally, the location of stresses was dependent on the mesial or distal placement of the prematurity, irrespective of its position buccolingually.
N R Mehta; F W Roeber; A W Haddad; I Glickman; J B Goodman
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of the American Dental Association (1939)     Volume:  93     ISSN:  0002-8177     ISO Abbreviation:  J Am Dent Assoc     Publication Date:  1976 Aug 
Date Detail:
Created Date:  1976-09-25     Completed Date:  1976-09-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7503060     Medline TA:  J Am Dent Assoc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  334-41     Citation Subset:  D; IM    
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MeSH Terms
Dental Occlusion, Traumatic / pathology,  physiopathology*
Dental Stress Analysis
Models, Anatomic*
Models, Structural*
Periodontium / pathology,  physiopathology*
Tooth Root / physiopathology
Tooth, Artificial
Reg. No./Substance:
0/Silicones; 51-79-6/Urethane

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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