Curing Composite Resin Through a Clear Polyvinyl Siloxane Matrix and its Effect on Microhardness
Abstract
To evaluate the effect of curing composite resin through a clear polyvinyl siloxane(PVS) matrix system with a microhardness test.7 groups with 10 samples in each group and cured at different distances: 0mm, 4mmno PVS, 4 mm PVS, 6mm no PVS, 6mm PVS, 8mm no PVS, 8mm PVS. Knoop Microhardness Test performed at 4 sites on the top and bottom surfaces of each sample. All groups had a bottom/top ratio over 0.80; however, the top side was significantly harder than the bottom (all P<0.05). The highest KHN Hardness values were found for the 0mmgroup (44.0, SD = 6.5) and the 4mm no PVS group (42.2, SD=4.5). Groups without PVS are harder than groups with PVS. The top surface is harder than the bottom surface in each group, but the bottom to top ratio does not appear to be affected by PVS. Clear PVS matrices cause a significant reduction in microhardness of the composite resin, especially when the curing light is 6mm from the restoration. If clear PVS matrix systems are used the restoration should be cured again after removing the matrix.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 14, 2019
- Accession Number
- AD1128095
Entities
People
- David K. Scoville
Organizations
- Uniformed Services University of the Health Sciences