Die Univertsität Erlangen hat 2006 das Schrumpfungsverhalten von Compositen getestet.
(Anmerkung des Autors: Schade eigentlich, dass die deutschen Zahnärzte diese steuerfinanzierte Forschung nur über den Umweg USA lesen können. Kommentare hierzu bitte im Forum)
|2464 Volumetric Polymerization Shrinkage Characteristics of Resin Materials for Different Indications|
|W. DASCH, U. LOHBAUER, and A. PETSCHELT, University of Erlangen, Germany|
Objectives: Recently a reliable method for the determination of polymerization shrinkage has been reviewed and proven by round-robin testing. The test method – so called Archimedes method – has been described in detail and published as German Dental Standard DIN 13907:2005. The purpose of this study was to characterize various methacrylate based materials for particular dental indications by their volumetric shrinkage values.
Methods: Ten restorative composites, three provisional resins (p), and three flowable composites (f) were tested according to the Archimedes method (n=6). All data were analyzed by One Way ANOVA/LSD tests (p<0.05), means with the same letters are statistically the same. Results:
Conclusions: All direct restorative materials revealed smaller volumetric shrinkage values in comparison to flowable composites and provisional resins. PCR100-exp showed significantly the lowest shrinkage value of all composites tested. Each group of materials for a particular indication was significantly different from the other groups, obviously in relation to the amount of inorganic filler. The Archimedes method proved to be a precise and reliable testing method, showing low standard deviation values.
|Seq #198 – Dental Materials: VI – Polymer Materials-Mechanical Properties and Degradation|
8:00 AM-10:00 AM, Saturday, 1 July 2006 Brisbane Convention & Exhibition Centre P5