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- W4252749749 startingPage "219" @default.
- W4252749749 abstract "The cross sectional data of 32 students who suffered the premature loss of M 1 (First Molar) from 13 to 15 of age in Minamidaito Island were used as materials.The purpose of this study was to examine the influence of the difference of the extraction time of M1 on permanent dentition. The results obtained were as follows:1. In the case that M1 was extracted while M2 (Second Molar) and P2 (Second Premolar) had not yet erupted, the extraction space of M1 tended to be closed by the mesial shifting of M2 and the distal wandering of P2 . In addition, M2 tended to rotate the mesial side toward lingual side without the mesial inclination. The rotation of P1 (First Premolar) and P2 varied individually.2. In the case that M1 was extracted while M2 had erupted but P2 had not, the extraction space of M1 tended to be closed mainly by the distal wandering of P2.3. In the case that M1 was extracted while M2 and P2 had already erupted, the extraction space of M1 wasn't completely closed. But this case was characterized by the mesial inclination of M2.4. In maxilla, the extraction space of M1 tended to be closed mainly by the mesial shifting of M2 in spite of being under the eruption or completely erupted of M2. In addition, M2 tended to rotate the mesial side toward lingual side. But P1 and P2 was stabilized in regards of rotation and distal wandering.5. There were some cases that only the extraction of M1 without orthodontic treatment could lead the discrepancy dentition to comparatively good dentition." @default.
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- W4252749749 date "1981-01-01" @default.
- W4252749749 modified "2023-10-18" @default.
- W4252749749 doi "https://doi.org/10.5357/koubyou.48.219" @default.
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