Sharma R, Pécora J D, Lumley P J, Walmsley A D
School of Dentistry, University of Birmingham, UK.
Endod Dent Traumatol. 1998 Apr;14(2):88-92. doi: 10.1111/j.1600-9657.1998.tb00817.x.
This study investigated the internal anatomy of 65 human mandibular canines with two well-defined roots. The teeth were decalcified and injected with gelatin coloured with india ink. Diaphanization was carried out using clear resin to allow permanent preservation. It was found that all mandibular canines with two roots had two root canals. Lateral canals were found in 68.9% of teeth and 19.7% had lateral canals at the bifurcation. The results of the external measurements (cusp tip to root apex) showed that the average buccal root length was 23.0 mm and the average lingual root length was 22.7 mm. The maximum and minimum buccal lengths were 26.7 mm and 17.9 mm respectively and the maximum and minimum lingual lengths were 27.2 mm and 17.1 mm respectively. The buccal root was the larger of the two in 47.7% of teeth and 43.1% had roots of equal size. The lingual root was larger than the buccal root in 9.2% of cases. Clinicians should be aware of the anatomical variation that exists for mandibular canines.
本研究调查了65颗具有两个明确牙根的人类下颌尖牙的内部解剖结构。将牙齿脱钙并用印度墨水染色的明胶进行注射。使用透明树脂进行透明化处理以实现永久保存。结果发现，所有具有两个牙根的下颌尖牙都有两个根管。68.9%的牙齿发现有侧支根管，19.7%在分叉处有侧支根管。外部测量（牙尖至根尖）结果显示，颊侧牙根平均长度为23.0毫米，舌侧牙根平均长度为22.7毫米。颊侧长度的最大值和最小值分别为26.7毫米和17.9毫米，舌侧长度的最大值和最小值分别为27.2毫米和17.1毫米。47.7%的牙齿中颊侧牙根较大，43.1%的牙齿牙根大小相等。9.2%的病例中舌侧牙根大于颊侧牙根。临床医生应了解下颌尖牙存在的解剖变异。
