Methods: The study was performed by using dry skull model covered with paraffin wax representing tissue. The protective devices attached with 12 mm. tungsten or lead sheets (size 2.5x3.5 cm212 mm.in thickness) were constructed and placed in the mandible buccally. The 6MV (2Gy) of photon was radiated, and then the percentage of remained relative doses in the mandible at different areas were measured.
Results: The percentage mean of remained relative dose was 46.126% and 30.204% in tungsten and lead respectively. The tungsten protective device significantly decreased the percentage mean of transmission dose more than the lead shield (p≤0.05) and the percentage mean of transmission dose of both shields was difference significantly in each location (p≤0.05).
Conclusions: The tungsten protective device can decrease the remained doses more than the lead device. The position holding the metals should be the buccally.