Document Detail

Comparative efficiency of plasma and halogen light sources on composite micro-hardness in different curing conditions.
MedLine Citation:
PMID:  12837397     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: Recent developments have led to the introduction of high power curing lights, which are claimed to greatly reduce the total curing time. This study evaluated the effectiveness of a plasma-curing device (Apollo 95 E) and a halogen device (Heliolux DLX), in different curing conditions. METHOD: Vicker's micro-hardness values were performed on 1 and 2 mm thick composite discs cured in a natural tooth mold by direct irradiation or indirect irradiation through composite material (2 or 4 mm) and dental tissues (1 mm enamel or 2 mm enamel-dentin). Measures were, respectively, performed after a 1, 3, 6 s (SC, step curing mode) or 18 s (3xSC) exposure to the plasma light, and a 5, 10, 20 or 40 s exposure to the halogen light. RESULTS: With the PAC light used, a 3 s irradiation in the direct curing condition was necessary to reach hardness values similar to those obtained after a 40 s exposure to the halogen light. Using the indirect curing condition, hardness values reached after an 18 s exposure (3xSC mode) with the plasma light were either equivalent or inferior to those obtained with 40 s halogen irradiation. SIGNIFICANCE: Direct polymerization with the plasma light used requires longer exposure times than those initially proposed by the manufacturer. The effectiveness of plasma generated light was lowered by composite or natural tissues, and therefore requires an important increase in the irradiation time when applied to indirect polymerization. The practical advantage of this polymerization method is less than expected, when compared to traditional halogen curing.
D Dietschi; N Marret; I Krejci
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Dental materials : official publication of the Academy of Dental Materials     Volume:  19     ISSN:  0109-5641     ISO Abbreviation:  Dent Mater     Publication Date:  2003 Sep 
Date Detail:
Created Date:  2003-07-02     Completed Date:  2003-11-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8508040     Medline TA:  Dent Mater     Country:  England    
Other Details:
Languages:  eng     Pagination:  493-500     Citation Subset:  D    
Division de Cariologie, d'Endodontie et de Pédodontie, Section de Médecine Dentaire, Faculté de Médecine, Université de Genève, 19 Rue Barthélémy Menn, 1205 Geneva, Switzerland.
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MeSH Terms
Analysis of Variance
Composite Resins / radiation effects*
Dental Equipment
Dental Stress Analysis
Hardness / radiation effects
Materials Testing
Polymers / chemistry
Silicon Dioxide / radiation effects
Surface Properties
Technology, Dental / methods
Time Factors
Zirconium / radiation effects
Reg. No./Substance:
0/Composite Resins; 0/Halogens; 0/Polymers; 0/Tetric ceram; 0/Z100 composite resin; 7440-63-3/Xenon; 7440-67-7/Zirconium; 7631-86-9/Silicon Dioxide

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