Provisional restorations are used to restore interim between tooth preparation and fitting a definitive restoration, and to ensure the patient continues to functional, and esthetic restorations. Recently, newly developed paste-type provisional resins, which include inorganic filler, have been available. Though the newly developed might have advantages, little is known about their physical and mechanical properties. The purpose of this study was to evaluate the filler contents, thermal expansion, and water sorption as well as flexural properties of paste-type resins and compare those of PMMA resins. Filler contents of provisional resins ranged from0.1to52.2wt%, and significant higher filler contents were found for paste-type resins. Thermal expansion of the provisional resins ranged from75.4to102.0×10
-6/°C and water sorption ranged from15.2to23.5μg/mm
3. From the results of this study, flexural strength ranged from54.1to82.3MPa and Young's modulus ranged1.60to3.24GPa. The SEM observation revealed that various sizes and shapes of filler were included in paste-type resins.
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