Multi-component 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. 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.
Proceedings Title: American Chemical Society Division of Polymer Chemistry|237th | |ACS
Conference Dates: March 22-26, 2009
Conference Location: Salt Lake City, UT
Conference Title: Polymer Preprints
Pub Type: Conferences
combinatorial, composite, cytotoxicity, nanoindentation, scratch test