Document Detail

Effects of cement bases on the stresses and deflections in composite restorations.
MedLine Citation:
PMID:  1060645     Owner:  NLM     Status:  MEDLINE    
A model was used to investigate stresses and deflections in cement bases and in a composite restorative material induced in a posterior Class I restoration. Deflections in the composite were highest when it was supported by a base with a low modulus; however, the maximum tensile stress (12 MN/meter2) occurring in the composite restoration at the interface with the base was well below the maximum tensile strength of most composite materials (30 to 40 MN/ meter2). Tensile and shear stresses occurring in the cement bases were of sufficient magnitude to exceed the strength of the cement when a 1.5-mm layer of zinc phosphate cement (base consistency) was supported by a 0.5-mm layer of ZOE lining material. Lowest values of stress were observed when a 2-mm layer of a zinc polyacrylate base was used to support the composite restoration. An ideal situation would be to have a cement base with a modulus of elasticity equal to that of the composite material. Finally, the maximum stress and deflection values obtained here can be easily exceeded in a clinical situation when wider variations can be easily introduced, making the choice of a cement with the proper modulus even more critical.
J W Farah; J M Powers; J B Dennison; R G Craig; J Spencer
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of dental research     Volume:  55     ISSN:  0022-0345     ISO Abbreviation:  J. Dent. Res.     Publication Date:    1976 Jan-Feb
Date Detail:
Created Date:  1976-03-24     Completed Date:  1976-03-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0354343     Medline TA:  J Dent Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  115-20     Citation Subset:  D; IM    
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MeSH Terms
Composite Resins*
Dental Cements*
Dental Restoration, Permanent*
Dental Stress Analysis
Models, Chemical
Reg. No./Substance:
0/Composite Resins; 0/Dental Cements

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

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