予防歯科医学におけるエアータービンエンジンの応用について

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Operative treatment, paticularly an amalgam restoration as the early treatment of dental caries should be still one of our most reliable and effective methods of controlling dental caries. However, the dental electric motor units as we have generally used are apt to prolong the operation because of its law efficiency and give discomfort both to patients and operators such as pain, heat generation or vibration. Thease undesirable factors make it difficult to protect collectively a large group of children from any of the dental abnormalities. The air dental Unit (abridged ATE here after for clearness) has been largely improved to exclude such undesirable properties described, and to testify its efficiency some experimental comparisons with the older dental electric unit (abridged DE here after for clearness) has been made. The results obtained are as follows. 1) Forty-seven qupils (male 26, female 21) aged 12 to 13 of a certin Yokohama middle school are selected in this study. The two caries molars, which initiated in the pits. or grooves, one is right and the other is left on the mandibular, are selected with each pupil. The questionnaire was asked by the operator immediately after finishing the restoration. According to thier answers, when ATE was use, 100 percent felt no discomfort, 17 percent had slight pain, 100 percent felt no temperature rise and only 6.4 percent complained of vibration, while 30 percent felt discomfort, 40 percent had pain 70 percent felt temperature rise and 70 percent complained of vibration when DE was used. Those who complained of pain during the operation were examined by Recording Psychogalvanometer. The hight of the drawing curve of ATE was half as high as that of DE. 2) The average time required for cavity preparation when carbide burs were used, was 33.5 seconds with ATE and 102.2 second with DE, therefore ATE was not only three times as effective as DE as cutting instrument, but also ATE can afford much more complete cavity preparation than DE. 3) The following minor test was also conducted. Extracted natural teeth were cut for a certain fixed time in order to compare the effectiveness of using ATE and DE which was shown as the weight reduces of the teeth cut off and the depth of the cavities. From the test it was proved that ATE was three or four times more effective than DE. Including the time factor, ATE was ten or twelve times more effective than DE. 4) When the enamel portion of extracted natural teeth were cut off with diamond point for 40 minutes without resting, one operator using ATE and another using DE, and the weight reduces of the teeth were determined, it was shown that ATE was seven or nine times more effective in cutting capacity than DE. Adding to this test, the comparative fatigue of the fingers was measured befor and after the test by the Smedley's dynamometer. The results show that any change was not found with ATE between start and end, while the reduction of 4.5-9.0 was found with DE. 5) Although the noise produced when using ATE and DE was 100-103 phone at its maximum with ATE and 75-80 phone with DE, no distinguishabl differences were observed during the cutting operation. Thease tests proved that the Air dent unit could afford a great contribution to the preventive dentistry because of its highest efficiency.
有限責任中間法人日本口腔衛生学会の論文

予防歯科医学におけるエアータービンエンジンの応用について

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