Temporal and regional variation of the tooth size in the Japanese inhabitants based on crown and root-cervix measurements.

根据牙冠和牙根-宫颈测量,日本居民牙齿尺寸的时间和区域变化。

基本信息

  • 批准号:
    08640911
  • 负责人:
  • 金额:
    $ 1.41万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    1996
  • 资助国家:
    日本
  • 起止时间:
    1996 至 1997
  • 项目状态:
    已结题

项目摘要

Temporal and regional variations of the various tooth sizes from the Initial Jomon period (about 10,000-6,000 BP) to the modern period in the Japanese inhabitants were investigated, using not only the maximum diameter of tooth crown but also a new measurement of tooth root-cervix uninfluenced by tooth attrition.1. The migrant group from the Aeneolithic Yayoi period (about 2,300-1,700 BP) to the modern period has larger teeth than the native group such as the Jomonese and the Ainu.2. The migrant Yayoi population or the protohistoric Kofun population has the largest teeth in the migrant group. The Yayoi or Kofun tooth size finally decreases toward the modern period, but the temporal decrease is accompanied with some fluctuations.3. The tooth sizes of the Neolithic Jomonese and the native Yayoi population show some reduction toward the recent Ainu in the native group.4. The most interesting result is a temporal change in a long term of the Jomon period. A temporal increase of the general tooth size was observed in the Initial-Early-Middle-Late-Final Jomon period (about 10,000-2,300 BP). The temporal change in the Jomon period shows an opposite change to the tooth reduction of a global tendency in the same period. There are some differences of the changing aspects between mesiodistal diameters and buccolingual diameters, and between crown diameters and root-cervix diameters. On the other hand, a temporal reduction of the ratio of the third molar to the other molar was shown, while the reduction might be contrary to the temporal increase of the general tooth size. Further research will be required in order to clarify the factor of the peculiar change in the Jomon period.
不仅使用牙冠的最大直径,还使用不受牙齿磨损影响的牙根-宫颈的新测量方法,对日本居民从最初的绳文时代(大约距今 10,000-6,000 年)到现代的各种牙齿尺寸的时间和区域变化进行了调查。1。从新石器时代弥生时代(距今约2,300-1,700年)到现代的移民群体的牙齿比绳文人和阿伊努人等本土群体的牙齿更大2。弥生族群或史前古坟族群的牙齿是迁徙族群中最大的。弥生或古坟的牙齿尺寸最终在近代逐渐减小,但时间上的减小伴随着一些波动。3.新石器时代的绳文人和弥生族原住民的牙齿尺寸与原住民群体中最近的阿伊努人相比,牙齿尺寸有所减小。4.最有趣的结果是绳文时代长期的时间变化。在绳文初期、早期、中期、晚期、末期(约距今 10,000-2,300 年),观察到总体牙齿尺寸随时间增大。绳文时代的时间变化与同时期全球牙齿减少趋势的变化相反。近远中径与颊舌径、冠径与根颈径的变化情况存在一定差异。另一方面,第三颗磨牙与另一颗磨牙的比例在时间上有所减少,而这种减少可能与一般牙齿尺寸在时间上的增加相反。为了弄清楚绳文时代特有的变化的因素,还需要进一步的研究。

项目成果

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MANABE Yoshitaka其他文献

MANABE Yoshitaka的其他文献

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{{ truncateString('MANABE Yoshitaka', 18)}}的其他基金

Population history of the Ryukyu Islanders in Japan as.viewed from temporal and regional variations of dental morphology.
从牙齿形态的时间和区域变化看日本琉球岛民的人口史。
  • 批准号:
    13640715
  • 财政年份:
    2001
  • 资助金额:
    $ 1.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

相似海外基金

Temporal and regional variation of the tooth size in the Japanese inhabitants based on crown and root-cervix measurements.
根据牙冠和牙根-宫颈测量,日本居民牙齿尺寸的时间和区域变化。
  • 批准号:
    10640692
  • 财政年份:
    1998
  • 资助金额:
    $ 1.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
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