Objective: To evaluate the short-term heat effects of mandibular bone to monopolar radiofrequency energy on porcine bone by thermoelectric testing and to compare the effects of six power settings at 65℃ on heat distribution in bone capsule.Methods: Twelve frozen porcine heads were included in our study.Four measurement points of the right mandible were treated with monopolar radiofrequency energy under bone cavity control in a single uniform pass to the bone surface.Bone temperature testing needles were inserted from the distal end of the right (test side) and the left (control side) mandible using a water bath guide.The internally thermal electrode with a 2-cm active tip was inserted through the needle to the right mandible.Samples were divided into two groups and in half of them the radiofrequency generator power settings were 5, 10, 15, 20, 25, and 30 watts.The electrode tip temperature was 65℃.In another halves radiofrequency was performed for 1, 2, 3, 4 min using a 30-W generator.Histologic analysis after surgery revealed thermal damage of capsule at all radiofrequency power settings.Three-point bending test was performed to measure flexural strength.Students t test was used to evaluate for significant differences between RFA and control side for each group.Mandibles underwent histological examination by hematoxylin and eosin staining after the bending test.The lesions cross-sectional area, depth, inflammation and the cells pyknosis, myonecrosis and were commensurate with radiofrequency power.