A comparative evaluation of polymerization stress data obtained with four different mechanical testing systems
作者： Flávia Gonçalves , Leticia C. Boaro , Jack L. Ferracane , Roberto R. Braga
DOI: 10.1016/J.DENTAL.2012.03.004
关键词: Elastic modulus 、 Rod 、 Dilatometer 、 Materials science 、 Cantilever 、 Composite material 、 Universal testing machine 、 Polymerization 、 Curing (chemistry) 、 Tukey's range test
摘要: Abstract Objectives The null hypothesis was that mechanical testing systems used to determine polymerization stress ( σ pol ) would rank a series of composites similarly. Methods Two were tested in the following systems: universal machine (UTM) using glass rods as bonding substrate, UTM/acrylic rods, “low compliance device”, and single cantilever device (“Bioman”). One had five experimental containing BisGMA:TEGDMA equimolar concentrations 60, 65, 70, 75 or 80 wt% filler. other commercial composites: Filtek Z250 (3M ESPE), A110 Tetric Ceram (Ivoclar), Heliomolar (Ivoclar) Point 4 (Kerr). Specimen geometry, dimensions curing conditions similar all systems. monitored for 10 min. Volumetric shrinkage (VS) measured mercury dilatometer elastic modulus E determined by three-point bending. Shrinkage rate measure reaction kinetics. ANOVA/Tukey test performed each variable, separately series. Results For composites, decreased with filler content systems, variation VS. materials, did not vary system showed very few similarities rankings others tests system. Also, no clear relationships observed between VS E. Significance good agreement but composites. Therefore, comparison results from different devices must be done carefully.
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