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Effects of filler type and content on mechanical properties of photopolymerizable composites measured across two-dimensional combinatorial arrays

Paper ID Volume ID Publish Year Pages File Format Full-Text
1265 80 2009 11 PDF Available
Title
Effects of filler type and content on mechanical properties of photopolymerizable composites measured across two-dimensional combinatorial arrays
Abstract

Multicomponent formulations coupled with complex processing conditions govern the final properties of photopolymerizable dental composites. In this study, a single test substrate was fabricated to support multiple formulations with a gradient in degree of conversion (DC), allowing the evaluation of multiple processing conditions and formulations on one specimen. Mechanical properties and damage response were evaluated as a function of filler type/content and irradiation. DC, surface roughness, modulus, hardness, scratch deformation and cytotoxicity were quantified using techniques including near-infrared spectroscopy, laser confocal scanning microscopy, depth-sensing indentation, scratch testing and cell viability. Scratch parameters (depth, width, percent recovery) were correlated to composite modulus and hardness. Total filler content, nanofiller and irradiation time/intensity all affected the final properties, with the dominant factor for improved properties being a higher DC. This combinatorial platform accelerates the screening of dental composites through the direct comparison of properties and processing conditions across the same sample.

Keywords
Combinatorial; Composite; Cytotoxicity; Nanoindentation; Scratch test
First Page Preview
Effects of filler type and content on mechanical properties of photopolymerizable composites measured across two-dimensional combinatorial arrays
Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 5, Issue 6, July 2009, Pages 2084–2094
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering