Because embryonic stem cells are so immature, it is very difficult to control what kinds of cells they produce, and the fear is that a tooth could grow inside a heart, for instance.
因为胚胎干细胞没有完全成熟，它很难控制他们将来的类型，比如害怕在心脏旁边长一颗牙齿。
CONCLUSION: MTA may be an ideal material for perforation repair and achieving apical seal in tooth with immature apex.
结论：本研究结果提示，MTA对穿孔修补和根尖屏障术方面是一种满意的材料。
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