Younes S A, al-Shammery A R, el-Angbawi M F
King Saud University, Alexandria, Egypt.
Oral Surg Oral Med Oral Pathol. 1990 Jan;69(1):102-5. doi: 10.1016/0030-4220(90)90276-x.
The occurrence of supplementary roots of the lower first permanent molars is 2.33% for a Saudi group of Asiatic descendants and 0.65% for an Egyptian group of African descendants. The most prominent finding demonstrated in this study is the lower percentage of occurrence of the third root among the Saudi samples compared to other Asiatic samples in other studies. Furthermore, this study confirmed the occurrence of the anomaly in our African samples, and the clinical situation illustrates the importance of early diagnosis to avoid complications for such molars by dental practitioners.
沙特亚洲后裔组下颌第一恒磨牙额外根的发生率为2.33%，埃及非洲后裔组为0.65%。本研究显示的最显著发现是，与其他研究中的其他亚洲样本相比，沙特样本中第三根的发生率较低。此外，本研究证实了我们非洲样本中存在这种异常情况，临床情况表明，早期诊断对于牙科从业者避免此类磨牙出现并发症非常重要。
