The Effect of Storage to Marginal Fit of Temporary Crown

Temporary crown is a fixed denture, placed in patient's mouth only for one to two weeks while waiting for the permanent crown to be completed. After the fabrication, temporary crown often needs to be kept in minimal one to three days before placing it into the patient's mouth. Contraction during polymerization can cause marginal cracks that can affects the fitness of the crown when placed into the patient's mouth. Objectives: The purpose of this research is to know the effect of storage duration of temporary crowns, made of self curing acrylic resin ( protem , 3M ESPE ) upon the marginal fit. Methods: Twenty specimens of temporary crowns made of self curing acrylic resin were use to fit with die master made of stainless steel. Ten specimens were storage at room temperature and ten others were soaked in artificial saliva for 24 hours and 72 hours. Marginal fit were then measured using an electric measuring microscope MM-40 Nikon, Japan and wheel photomicroscope M-140. Statistical analysis were done using independent t test. Results: The results showed that at 24 hours storage time of 24 hours, specimens stored showed at room temperature, and mean marginal space was 29.65 micron, while specimen soaked in an artificial saliva the mean of marginal space was 26.76 micron. At storage time of 72 hours, the mean marginal fit were 65.13 micron and 52.18 micron for each group ).There were statistically difference between two groups (independent t test, p <0,05 ). Conclusion: It can be concluded that attention should be paid if resin acrylic temporary crowns will be stored before insertion in the patient's mouth