[A型题] 试题 1～10 1.答案:D [题解] A B C E对区别恒乳牙有一定参考价值,但有易变性。由于正常恒乳牙的解剖形态基本固定,故是区别恒乳牙最可靠的依据。 2.答案:D [题解] 忒奈牙是因乳牙根尖周感染,影响其下方的恒牙牙胚,而使牙釉质发育不全。B与遗传有关,常发生在同一家族的牙齿结构异常。C与牙齿钙化期使用四环素族抗生素有关。E与当地水或食物中含氟过量有关。D则是因严重全身疾病,营养障碍使釉质钙化障碍而遗留下的永久缺陷。 [A type of questions] questions 1 ~ 10 1. Answer: D [solution] A B C E on the differential constant teeth have some reference value, but volatile. Due to the normal anatomy of constant permanent teeth basically fixed, it is the most reliable basis for the difference between permanent breast teeth. 2. Answer: D [Explanation] Te Na tooth is due to primary root tip infection, affecting the bottom of the permanent tooth germ, leaving enamel hypoplasia. B and genetic, often occur in the same family of abnormal tooth structure. C and tooth calcification using tetracycline antibiotics. E is related to excess fluoride in local water or food. D is due to severe systemic disease, nutritional disorders make enamel calcification disorders left over by the permanent defects.