2008 Volume 51 Issue 6 Pages 639-647
The use of flowable resins for cementation of composite resin inlays was investigated in order to improve physical or aesthetic problems of inlays cemented with a dual-cured resin cement. The purpose of this study was to estimate the film thickness of flowable resins and the polymerization of flowable resins under the composite resin inlays. Materials tested were 11 flowable resins, a resin for laminate veneer cementation and a dual-cured resin cement. Each material was sandwiched between two glass slabs and a force of 150N was applied to the samples for ten minutes at 4, 23 and 37℃. The film thickness was tested after light-activation. Furthermore, the thickness of the bonding agents was tested after weak or strong compressed air blowing (0.05MPa or 0.10MPa) and light-activation. The polymerization of the flowable resins was tested to measure the surface hardness of the materials that had been light-activated for 40 seconds through the composite resin inlay block of 0 to 5mm in height. The results were as follows: 1. The film thickness of nearly all materials tested decreased as the temperature increased. 2. At 37℃ the sum total of the thickness of each material tested, except one flowable resin, plus that of the corresponding bonding agent with strong compressed air blowing was less than 25μm, which is the standard thickness for luting agent cementation. 3. The surface hardness of nearly all materials tested tended to decrease when the composite resin inlay thickness was approximately 2mm.
