抄録
With regard to the etiology of the so-called cuneiform defect of the human tooth, there have been many researches so far, but we are unable to find out any reliable theory about this disorder in them.
Then the author tried to make some fundamental experiments on the cause of this defect. At first the author tried to classify the cervical defects which were found on the extracted teeth and the enamel defects which occured on the vital teeth of many patients, in order to investigate their whole picture. Next the author turned this study towards the observation of frequency of these defects.
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