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ObjectiveTo determine the thickness of dental tissue through which Prime Dent Resin® might exhibit light-polymerization with minimum shrinkage and suitable curing depth.Method80 laminae measuring 1, 2, 3 and 4mm thickness were obtained from molars (20 laminae per group). Contraction was measured and resin shrinkage was calculated by polymerization (Visilux 2, 3M) though each lamina (60 s, 400 mW/cm2). Bonded-disk technique was used. Depth of curing tests were undertaken by measuring the thickness of polymerized resin according to ADA's specification number 27. A control group without dental tissue was prepared for both properties. Data were analyzed using ANOVA with Tukey test (p < 0.001).ResultsCuring depth: curing depth decreased as thickness increased. All groups revealed statistically significant differences. The thickness that exhibited lesser shrinkage nonetheless meeting with suitable curing depth (ADA establishes minimum value of 1mm) was the 3mm group. Shrinkage: as thickness increased, shrinkage decreased; no statistically significant difference was reported for groups 2 and 3mm.ConclusionsAccording to obtained results, it is possible to polymerize through a 3mm thickness, therefore polymerization is not recommended through a 4mm depth. It will be necessary to obtain further mechanical properties using different thicknesses of dental tissue

Light-polymerization of composite resins through different thicknesses of dental tissue