逆生萌出した下顎第 2 小臼歯の 1 例

概要

論文の詳細を見る
Many cases of inverted tooth have been reported so far. It is noted, however, that most of the cases have appeared in the upper jaw, while their appearance in the lower jaw is extremely rare in spite of the fact that abnormal tooth positions are liable to occur more frequently at the lower premolar area. One such case the author encountered is, therefore, considered worthy of reporting and introduced herein as follows : This case was found in a male, 38 years of age. In seven years after this man's deciduous molar and the stump of the first molar next to this deciduous molar of his grown up, left lower jaw, were extracted, the second premolar invertly erupted from the molar region. Although there is no was to detect the cause of this case, the author imagines that either of the following two possibilities or their combination might be the answer : 1. The premolar in question was rotated during its impaction due to the external force caused by the extraction operation of the deciduous molar and the stump of molar, and in time erupted invertly. 2. The premolar had been destined to, already from the time of its dentification, to be inverted in its position and direction of groth, and thus erupted as the erutive way was released
九州歯科学会の論文
1973-07-31