Malhotra S K, Richardson E R
J Dent Res. 1981 Feb;60(2):123-7. doi: 10.1177/00220345810600020501.
The purpose of this study is to present the data on molar size sequence (MSS) in American Blacks. The results are compared with other studies on American Whites. It is evident from the findings that reasonably high percentage of M2 greater than M1 (where second molars are larger mesiodistally than first molars) exists in both the groups. This suggests that the M2 greater than M1 molar sequence should not be considered as a primitive characteristic, since a high percentage of this sequence is seen in the modern population. The percentage of incidences of M2 greater than M1 in the maxillary arch seems to be significantly higher in American Whites, in both the sexes and as a total group, that in American Blacks. In the case of the mandibular arch, the percentage is significantly higher in American Blacks.
本研究的目的是呈现美国黑人的磨牙大小序列（MSS）数据。将结果与其他关于美国白人的研究进行比较。从研究结果可以明显看出，两组中都存在相当高比例的M2大于M1（即第二磨牙近远中径大于第一磨牙）的情况。这表明M2大于M1的磨牙序列不应被视为原始特征，因为在现代人群中该序列的比例很高。在美国白人中，无论男女还是总体人群，上颌弓中M2大于M1的发生率百分比似乎都显著高于美国黑人。在下颌弓中，美国黑人的该百分比显著更高。
