超音波発生装置を使用したポスト除去に関する研究第2報

概要

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It was found in the last study that ultrasonic energy is effective in reducing retentive forces of dowels. In this study, we actually removaled 147 dowels cemented in the mouths. The results were as follows : 1. Out of 147 cases, 146 cases (99%) were successful to reunove dowels with ultrasonic energy, which would be effective in reducing retentive forces. 2. Removal was successful within 5 minutes in 91 cases (62%). 3. 18 cases (12%) of patients expressed discomforts during or after applying the ultrasonic energy, but they didn't continue but faded away immediately. 4. In 10 cases of successful removal, the ultrasonic apparatus was not used at all. 5. Removal was successful within 30 minutes in 112 cases (83%). 6. Cement layer was interfacially broken in 75 cases (51%). 7. By the followup study of 57 cases, 2 cases indicated unpleasantness but no cases exhibited percussion pain, spontaneous pain and occlusal pain.
1991-08-01