Lukacs John R.
Department of Anthropology, University of Oregon, Eugene, Oregon.
Am J Hum Biol. 1999 Nov;11(6):718-734. doi: 10.1002/(SICI)1520-6300(199911/12)11:6<718::AID-AJHB2>3.0.CO;2-7.
This study reports the prevalence, distribution, and expression of enamel defects in a sample of primary teeth (n = 225) from a prehistoric site in western India (1400-700 BC). Five enamel surfaces of individual, isolated primary teeth were observed for surface defects using a binocular stereomicroscope with variable power of magnification (8-20x). Standards for evaluating dental enamel defects (DDE) recommended by the Fédération Dentaire International (FDI) were employed. Details of defect expression were also recorded, including size, shape, and surface of tooth crown affected. Hypoplastic enamel defects were observed in 28% of teeth, but the distribution and expression of defects was not random. More than 50% of canine teeth had hypoplastic defects (HD); incisors and molar teeth exhibited far fewer HD. The buccal surface of canines was the most commonly affected crown surface. Areas of missing enamel were also common on the mesial and distal surfaces of canines and incisors and on the mesial surface of molar teeth. The high frequency of enamel defects found on interproximal crown surfaces warrants a label, and the name interproximal contact hypoplasia (IPCH) is proposed. Linear enamel hypoplasia (LEH) was absent from this primary dental sample. IPCH is more frequent in mandibular than in maxillary teeth, but no side preference was detected. In canine teeth, buccal hypoplasias (localized hypoplasia of primary canines; LHPC) were not positively correlated with interproximal hypoplastic defects. The etiology of IPCH may involve mesial compaction of developing teeth due to slow longitudinal growth of the jaws. Episodic bone remodeling results in ephemeral fenestrae in the mesial and distal walls of the dental crypt permitting tooth-tooth contact and disruption of amelogenesis. IPCH prevalence decreases across the subsistence transition from sedentary Early Jorwe agriculturalists to seminomadic Late Jorwe hunters and foragers, but the difference is not statistically significant. This may be due to underrepresentation of mandibular teeth in the sample. Am. J. Hum. Biol. 11:718-734, 1999. Copyright 1999 Wiley-Liss, Inc.
本研究报告了来自印度西部一个史前遗址（公元前1400 - 700年）的乳牙样本（n = 225）中釉质缺陷的患病率、分布情况及表达情况。使用具有可变放大倍数（8 - 20倍）的双目立体显微镜观察单个孤立乳牙的五个釉质表面，以检测表面缺陷。采用了国际牙科联合会（FDI）推荐的评估牙釉质缺陷（DDE）的标准。还记录了缺陷表达的详细情况，包括受影响的牙冠大小、形状和表面。在28%的牙齿中观察到发育不全性釉质缺陷，但缺陷的分布和表达并非随机。超过50%的犬齿有发育不全性缺陷（HD）；切牙和磨牙的HD则少得多。犬齿的颊面是最常受影响的牙冠表面。牙釉质缺失区域在犬齿和切牙的近中面和远中面以及磨牙的近中面也很常见。在邻面牙冠表面发现的釉质缺陷频率较高，因此需要一个名称，本文提出了邻面接触发育不全（IPCH）这一名称。该乳牙样本中未发现线性釉质发育不全（LEH）。IPCH在下颌牙齿中比在上颌牙齿中更常见，但未检测到左右侧偏好。在犬齿中，颊面发育不全（乳牙犬齿局部发育不全；LHPC）与邻面发育不全性缺陷无正相关。IPCH的病因可能涉及由于颌骨纵向生长缓慢导致发育中的牙齿近中挤压。间歇性骨重塑导致牙囊近中壁和远中壁出现短暂的小孔，从而允许牙齿间接触并干扰釉质形成。从定居的早期乔尔韦农业人群到半游牧的晚期乔尔韦狩猎采集人群，IPCH患病率在生存方式转变过程中有所下降，但差异无统计学意义。这可能是由于样本中下颌牙齿代表性不足。《美国人类生物学杂志》11:718 - 734，1999年。版权所有1999威利 - 利斯公司。
