Original Article
Effect of Pressure Changes on Fracture Resistance and Micro-leakage of Three Types of Composite Restorations during Simulated Dives and Flights
Author(s):
Elnaz Shafigh, Reza Fekr Azad and Ali Mokhtar*
Background: Pressure changes can affect dental restorations especially in divers. The aim of the present study was to assess the fracture resistance and Micro-leakage of the MOD restorations using three types of composite resins undergoing pressure changes, simulating SCUBA-diving and aviation. Methods: For fracture resistance test 90 sound maxillary premolar teeth were randomly assigned to 3 groups of 30 MOD composite restorations using three types of composite resins (nanohybride 3M Z350, microhybride 3M Z250, packable 3M P60) were prepared. Each group was then divided to 3 subgroups of 10 for simulating SCUBA-diving (2 bar pressure cycle), Flight (0.5 bar pressure cycle) and control (atmosphere pressure). The teeth undergone pressure cycles for 1 month and then fracture resistance test was conducted on them using instro.. Read More»
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