DIMENSIONAL STABILITY OF 2 VISIBLE-LIGHT-CURED INDIRECT INLAY ONLAY RESIN COMPOSITE-MATERIALS/

Purpose: To evaluate the dimensional stability over time of two visibl e light-cured indirect inlay/onlay resin composites. Materials and Met hods: Twenty working dies of a Class II preparation were constructed i n type IV die stone from impressions of a master metal die. Working di es were randomly divided into two groups of 10 with Class II resin com posite inlays fabricated using Brilliant Dentin (n=10) and Triad inlay material (n=10). Inlays were seated on the master metal die 1, 3 and 10 days after fabrication and resin replicas were made of the proximal gingival margin surface which were gold-sputtered and used for the me asurement of gingival margin gap distances at four locations using an SEM micron measurement system. Results: Triad inlays mean gingival mar gin gap measurement was significantly (P<0.05) greater at 10 days vers us 1 day. Brilliant Dentin inlays had no significant mean gingival mar gin gap measurement differences between any time periods. As a materia l, Triad inlays had significantly less gingival margin gap distances t han the Brilliant Dentin inlays at all three time intervals.