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Objective: This study is aim to find optimum curing time and curing distance of composite resin to minimize the bisphenol A exposure by analyzing bisphenol A eluted in artificial saliva from resin specimens cured by different conditions. Methods: Two types of composite resin (flowable type and hybrid type) were photopolymerized with different curing times (10, 15, 20, 40, and 60 seconds) and curing distances (0, 1, 3, 5, 10, 15 and 20 mm). After the polymerization, samples were extracted at different time points up to 24 hours. The released monomers were analyzed using high performance liquid chromatography-diode array detector system at ultraviolet 210 nm. Results: The bisphenol A was eluted in the smallest quantities when cured at a 1 mm distance from both flowable and hybrid type resin specimens. The optimum curing time was 20 seconds in flowble type resin and was 10 seconds in hybrid type resin. Flowable type resin released more bisphenol A at long curing distance (>5 mm) and short curing time (<15 seconds). Conclusion: The bisphenol A was minimally eluted when the composite resins are cured at 10 mm-distance for 10 to 15 seconds.

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