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方法制作犬乳恒牙替换期牙槽骨组织切片，采用免疫组化检测破骨细胞中CNP的表达情况。
Methods By immunohistochemical experiment on different period of dog's alveolar bones to find if CNP were expressed in osteoclasts.
因此，了解乳恒牙替换的时间和规律，为口腔医生对儿童口腔疾病的预防和治疗提供了参考依据。
Therefore, a deep understanding of the temporal and sequential characteristics of permanent teeth eruption will help dentists in the prevention and treatment of dental diseases.
目的：探讨犬乳恒牙替换过程中血管内皮生长因子（ VEGF）在犬恒牙胚发育中的表达及意义。
Objective To study the expression and significance of Vascular Endothelial Growth Factor(VEGF) in the development of dogs permanent teeth germs.
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