The effect of water sorption on the ultimate transverse strength of a heat-cured denture base resin relined with four different direct denture reline materials was investigated.The relined specimens were tested after 1 day and 1 month of water immersion. It was found that prolonged duration of water immersion and an increase in the thickness of the reline material significantly (p<0.01) decreased the ultimate transverse strength of specimens relined with powder-liquid type direct reline materials. Specimens relined with paste type reline material did not change the ultimate transverse strength after 1 month of water immersion significantly.

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