الفهرس 
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Abstract
This study aimed to evaluate a new CAD/CAM provisional prosthetic material in comparison with
two commonly used provisional prosthetic materials regarding the marginal accuracy at different
water storage conditions.Three different provisional materials (VITA CAD-Temp,Protemp 4 and
Acrostone ) were used to fabricate 15 temporary bridges on two prepared teeth (stainless steel dies
were milled with 5 mm occluso-gingival height, 9 mm external cervical diameter, 7 mm internal cervical diameter, 5 mm occlusal diameter, 10 degrees occlusal
convergence angle and 1 mm thickness shoulder finish line),and examined for marginal accuracy
using stereomicroscope before and after 2 different conditions of water storage (one day, two
weeks).ANOVA test showed (P- value < 0.001) there was no statistically significant difference
between VITA CAD-Temp after two weeks and Acrostone pre-cementation;(0.027±0.005,0.022±0.006 mm respectively); both showed the statistically
significantly lowest mean gap distance.Conclusion.Water storage significantly affects the vertical
marginal gap distance of the tested provisional restorations.VITA CAD-Temp showed decreased
vertical marginal gap after two weeks water storage after cementation compared to pre-cementation
values