乳牙的萌出时间有很大的个体差异。
Time of eruption of deciduous teeth have a lot of individual differences.
结论：成功从人乳牙牙髓中分离出牙髓干细胞，并诱导成成骨细胞。
CONCLUSION: Obtained dental pulp stem cells from deciduous teeth and induced them to osteoblasts successfully.
虽然20颗乳牙一般全部萌出在3岁左右，但是萌出的步骤和顺序是多种多样的。
Although all 20 primary teeth usually appear by age 3, the pace and order of eruption varies.
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