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Volume 48 (1981)
- Issue 4 Pages 311-
- Issue 3 Pages 255-
- Issue 2 Pages 199-
- Issue 1 Pages 1-
Volume 48, Issue 2
Displaying 1-10 of 10 articles from this issue
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—Its Application to the Research Field of Hard Tissues—Hideaki Ogura1981 Volume 48 Issue 2 Pages 199-218
Published: June 30, 1981
Released on J-STAGE: December 08, 2010
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Keiichi Takei, Masami Yonemitsu, Shogoro Okada1981 Volume 48 Issue 2 Pages 219-229
Published: June 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe 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.View full abstractDownload PDF (4925K) -
Saburo Yahata, Makoto Sato, Mitsuo Sasaki1981 Volume 48 Issue 2 Pages 230-239
Published: June 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSWe were asked to offer dental treatment about 951 population in western areas of Iriomote Island in 1980. Dental survey on 177 schoolchildren and 87 adults were carried out during the time.
The results of dental survey were summarised as follows:
1) Compared with the mean values of schoolchildren of the Japanese, the caries prevalence rate of 177 schoolchildren in this area was much higher (89.3 per cent) .
2) DMF teeth per child of Iriomote Island showed higher value (4.83) than those of the all Japanese schoolchildren. D teeth per child were higher (3.02), but F teeth per child were marke-dly lower (1.54) .
3) Restrative rate of carious permanent teeth of schoolchildren in Iriomote Island was much lower (31.9) .
4) Rates of children of first and third grades of the midlde school having one or more caries teeth among the anterior teeth were 65.0 per cent, 70.0 per cent, respectively, and they were much higher, compared with Tani's report.
5) Compared with the mean values of high school students in Tokyo, both plaque index and gingival index of inhabitants of Iriomote Island were significantly high. Both indices of the upper right firstmolar showed the highest values among 6/41 _??_ 14/6 teeth.
6) The questionaire on the frequency of daily tooth brushing were made to them. Compared with the mean values of the all Japanese schoolchildren, the rate of schoolchildren, who were daily tooth brushing was about ten and twenty per cent lower in boys, in girls, respectively.
7) Fluorine content with 7 samples of drinking water in the Island were determined. They were about 0.05 ppm F.View full abstractDownload PDF (1106K) -
Harumi Mizuki, Masatoshi Ohnishi, Shigetaka Yanagisawa, Hidemi Yoshima ...1981 Volume 48 Issue 2 Pages 240-246
Published: June 30, 1981
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese]1981 Volume 48 Issue 2 Pages 247
Published: June 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (145K) -
[in Japanese]1981 Volume 48 Issue 2 Pages 248
Published: June 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (150K) -
[in Japanese], [in Japanese]1981 Volume 48 Issue 2 Pages 249
Published: June 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (122K) -
[in Japanese]1981 Volume 48 Issue 2 Pages 250
Published: June 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (131K) -
[in Japanese]1981 Volume 48 Issue 2 Pages 251
Published: June 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (137K) -
[in Japanese], [in Japanese]1981 Volume 48 Issue 2 Pages 252
Published: June 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (1901K)
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