Title
Dual-cure luting composites : part 2 : clinically related propertiesDual-cure luting composites : part 2 : clinically related properties
Author
Faculty/Department
Faculty of Medicine and Health Sciences
Research group
Translational Neurosciences (TNW)
Publication type
article
Publication
Oxford,
Subject
Human medicine
Source (journal)
Journal of oral rehabilitation. - Oxford
Volume/pages
21(1994):1, p. 57-66
ISSN
0305-182X
ISI
A1994MN27900006
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
Thirteen dual cure luting composites were compared in function of film thickness, consistency, and working time by using the American National Standard/American Dental Association (ANS/ADA) specifications for zinc phosphate cement and direct filling resins. The effect of temperature and setting reaction on the film thickness was also evaluated for some representative products. All three clinically related properties varied widely among the products investigated. A strong linear correlation was found between film thickness and consistency. This relation is supported by the temperature dependence of film thickness of dual cure luting composites. Cooling of the material increased the consistency, resulting in a larger film thickness, while heating reduced the film thickness because of the lower consistency. However, one product with a rather short working time at room temperature occasionally exhibited a dramatically enlarged film thickness after heating, probably caused by accelerated chemical polymerization. No correlation emerged between film thickness and maximum filler size or between consistency and filler weight content. Maximum filler size and filler weight content had been measured previously in Part I of this study. Scanning electron microscope (SEM) analysis of the cured film thickness samples revealed that the largest filler particles had been crushed under the heavy load pressure during film thickness measurement. The lack of correlation between consistency and filler weight content can be explained by the multifactorial determination of the consistency. It is concluded that the great diversity in the currently available luting composites makes clear specifications with regard to the optimum composition of luting composites urgently needed. Furthermore, more adequate methods for testing the film thickness of luting composites are also required.
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