Document Detail

Effect of food-simulating liquids on surface characteristics of composite and polyacid-modified composite restoratives.
MedLine Citation:
PMID:  11203812     Owner:  NLM     Status:  MEDLINE    
The chemical environment is one aspect of the oral environment that could have an appreciable influence on the in vivo degradation of composite resins. The effects of food-simulating liquids on the surface roughness and hardness of composite (Silux Plus, Z100, Spectrum TPH, and P50) and polyacid-modified composite resins (F2000 and Dyract AP) were thus investigated and compared. Sixty disks of each material were made. Half were used for microhardness testing and the remaining half for studying surface roughness using profilometry. Each group of 30 disks was subdivided into six groups of five and conditioned for one week as follows--Group 1 (control): air at 37 degrees C; Group 2: distilled water at 37 degrees C; Group 3: 0.02 N citric acid at 37 degrees C; Group 4: 0.02 N lactic acid at 37 degrees C Group 5: heptane at 37 degrees C; Group 6: 50% ethanol-water solution at 37 degrees C. Data were analyzed using one-way ANOVA and Scheffé's test at a significance level of 0.05. Results showed that the surface roughness of all restoratives evaluated was not significantly affected by food-simulating liquids. No significant change in surface hardness was noted with conditioning of Spectrum TPH, Dyract AP, and F2000 in the various food-simulating liquids. The BIS-GMA-based composites Silux Plus, Z100, and P50 appeared to be more susceptible to the softening effects of some food-simulating liquids.
A U Yap; J S Low; L F Ong
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Operative dentistry     Volume:  25     ISSN:  0361-7734     ISO Abbreviation:  Oper Dent     Publication Date:    2000 May-Jun
Date Detail:
Created Date:  2001-02-05     Completed Date:  2001-04-19     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7605679     Medline TA:  Oper Dent     Country:  United States    
Other Details:
Languages:  eng     Pagination:  170-6     Citation Subset:  D    
National University of Singapore, 5 Lower Kent Ridge Road, Singapore 119074, Republic of Singapore.
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MeSH Terms
Analysis of Variance
Bisphenol A-Glycidyl Methacrylate / chemistry
Citric Acid / chemistry
Compomers / chemistry*
Composite Resins / chemistry*
Dental Restoration, Permanent*
Ethanol / chemistry
Heptanes / chemistry
Lactic Acid / chemistry
Materials Testing
Methacrylates / chemistry
Silicates / chemistry
Silicon Dioxide*
Statistics as Topic
Surface Properties
Water / chemistry
Reg. No./Substance:
0/Compomers; 0/Composite Resins; 0/Dyract; 0/Heptanes; 0/Methacrylates; 0/Silicates; 0/Spectrum composite resin; 0/Z100 composite resin; 117681-35-3/P50 composite resin; 123759-84-2/Silux Plus; 1565-94-2/Bisphenol A-Glycidyl Methacrylate; 50-21-5/Lactic Acid; 64-17-5/Ethanol; 7440-67-7/Zirconium; 7631-86-9/Silicon Dioxide; 77-92-9/Citric Acid; 7732-18-5/Water

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

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