Ong G, Neo J
Department of Operative Dentistry, Faculty of Dentistry, National University of Singapore.
Arch Oral Biol. 1990;35(11):925-8. doi: 10.1016/0003-9969(90)90074-k.
Eight hundred and forty teeth were surveyed, 60 approximal surfaces for each tooth type being studied. Approximal root concavities were completely absent in maxillary central incisors, in contrast with mandibular central incisors of which 73% had concavities on mesial surfaces and 93% on distal surfaces. Similarly, a markedly higher prevalence was found for mandibular lateral incisors and canines. However, mandibular first and second molars had fewer approximal concavities than their maxillary counterparts. In maxillary teeth, concavities were more frequent on distal surfaces, while for mandibular teeth no definite pattern was seen. In both maxillary and mandibular teeth, approximal concavities often started in enamel, extending down to the root surface. There were differences in the approximal root topography of Chinese teeth in comparison with other populations.
共检查了840颗牙齿，每种研究的牙齿类型有60个邻面。上颌中切牙完全没有邻面牙根凹陷，而下颌中切牙73%的近中面和93%的远中面有凹陷。同样，下颌侧切牙和尖牙的患病率明显更高。然而，下颌第一和第二磨牙的邻面凹陷比上颌对应牙齿少。在上颌牙齿中，远中面的凹陷更常见，而下颌牙齿则没有明确的模式。在上颌和下颌牙齿中，邻面凹陷通常始于牙釉质，向下延伸至牙根表面。与其他人群相比，中国人牙齿的邻面牙根形态存在差异。
