Exposure dose to the examinee was measured using glass dosimeter in the test using panorama device at the time of dental treatment. As a result of measuring expose dose to lens according to the different sizes of Pb banding of own manufacturing to reduce exposure dose to lens especially sensitive to radiation, it was verified that exposure dose to lens varied depending on the size of the Pb banding. With the size of Pb banding of $3{ imes}20{ imes}0.2cm$, exposure dose tended to increase higher than normal value, and with the size of or more than $5{ imes}20{ imes}0.2cm$, it decreased. And also, the obtained image with the size of $7{ imes}20{ imes}0.2cm$ was not suitable for diagnosis. Therefore, it is expected that exposure dose would be reduced by using Pb banding of the size of not less than $5{ imes}20{ imes}0.2cm$ and not more than $6{ imes}20{ imes}0.2cm$ in the test, to minimize exposure dose and conduct panorama test efficiently.