Carlsen O, Alexandersen V
Department of Dental Morphology and Forensic Odontology, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Denmark.
Acta Odontol Scand. 1999 Oct;57(5):283-9. doi: 10.1080/000163599428715.
The School of Dentistry in Copenhagen possesses a collection of 96 human permanent maxillary molars (M sup) with a root complex, the macromorphology of which includes a facially located supernumerary root known as radix paramolaris (RP) and/or a distally located supernumerary root called radix distomolaris (RD). Systematic analysis of these teeth enabled the authors to establish precise criteria for the identification of RP and RD on M sup; 91.5% out of a total of 70 RP identified occurred on M3 sup, 7.2% on M2 sup, and 1.4% on M1 sup. The corresponding percentages for 29 RD identified were: 96.5% on M3 sup, 3.4% on M2 sup, and 0.0% on M1 sup; 50.0% of the 70 RP were separate in relation to the 2 facial root components and 31.5% non-separate; in 18.6% of the RP observed, it was impossible to establish whether or not they were separate. Corresponding frequencies for the 29 RD in relation to the distofacial and lingual root components were 41.3% separate and 37.9% non-separate; 20.7% of the roots could not be categorized. The following clinically relevant macromorphological variables regarding RP and RD were also observed: degree of separation in relation to the respective neighboring root components, degree of divergence in relation to the same macrostructures, apical bend, apical gracility, and pattern of fusion.
哥本哈根牙科学院收藏了96颗带有牙根复合体的人类上颌恒磨牙（Msup），其大体形态包括位于颊侧的额外牙根，即副磨牙根（RP）和/或位于远中的额外牙根，即远中磨牙根（RD）。对这些牙齿的系统分析使作者能够建立在Msup上识别RP和RD的精确标准；在总共70颗已识别的RP中，91.5%出现在M3sup上，7.2%出现在M2sup上，1.4%出现在M1sup上。29颗已识别的RD的相应百分比为：96.5%在M3sup上，3.4%在M2sup上，0.0%在M1sup上；70颗RP中有50.0%与两个颊侧牙根成分分离，31.5%未分离；在观察到的RP中，18.6%无法确定它们是否分离。29颗RD相对于远中颊侧和舌侧牙根成分的相应频率为41.3%分离和37.9%未分离；20.7%的牙根无法分类。还观察到以下与RP和RD相关的临床相关大体形态学变量：与各自相邻牙根成分的分离程度、与相同大体结构的分歧程度、根尖弯曲、根尖纤细度和融合模式。
