: The purpose of this study was to improve the property of photo-cured type denture relining resins.Specimens of three commercial resins were cured under 4 conditions (condition 1 : photo-cure following manufacturer's instructions, condition 2 : condition 1 +heating at 60 for 15 minutes, condition 3 : repeat condition 1 three times, condition 4 : condition 3+condition 2).1. The amount of eluted monomers under conditions 2, 3 and 4 measured by HPLC was decreased compared with that of condition 1.2. The amount of generated radicals under condition 2, 3 and 4 measured by ESR was decreased compared with that of condition 1.3. The curing depth, water sorption and transverse strength were increased compared with those of condition 1.4 . The adaptability, surface hardness and surface roughness were not influenced by curing conditions.The results suggested that condition 4 is the most effective method to improve the property of photo-cured type denture relining resins, and condition 3 is a simple and effective method for clinical use.
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