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1、从外部观察,牙体是由哪些部分组成? A、牙釉、牙骨质、牙本质 B、牙釉质、牙本质、牙髓 C、牙冠、牙颈、牙根 D、牙冠、根管、根尖孔 E、髓腔、根管口、根尖孔 2、乳牙(牙合)时期是指: A、新生儿～2岁半左右 B、7个月～2岁半 C、7个月～6岁 D、2岁半～6岁 E、6岁～12岁 3、恒牙(牙合)时期是指: A、7个月～6岁左右 B、2岁半～6岁左右 C、2岁半～12岁左右 D、6岁～12岁左右 E、12岁以后 4、第一恒磨牙牙胚何时形成? A、5岁左右 B、2岁左右 C、出生前后 D、胚胎第4个月 E、胚胎第2个月5.牙体外形高点是指:
1, from the outside, which part of the tooth is formed? A, enamel, cementum, dentin B, enamel, dentin, pulp C, crown, neck, root D, crown, root Tube, apical hole E, medullary cavity, root canal orifice, apical foramen 2, deciduous period refers to: A, neonatal ~ 2 years and a half B, 7 months to 2 years and a half C, 7 Months to 6 years of age D, 2 years and a half to 6 years of age E, 6 to 12 years 3, permanent teeth (occlusion) period refers to: A, 7 months to 6 years old B, 2 years and a half to 6 years old C , 2 years and a half to 12 years old D, 6 years old to 12 years old E, 12 years old 4, When the first permanent molars tooth germs? A, 5 years old B, 2 years old C, before and after birth D, embryos 4th month E, 2nd month of embryo 5. Contour of tooth body means: