女，14岁。偶然发现右下后牙颊侧牙龈有小脓包前来就诊。查：右下第二前磨牙畸形中央尖折断，Ⅰ度松动。颊侧牙龈有窦道口。X线片见根长为9mm。根尖呈燕尾状敞开。根尖周X线透射区4mm×5mm。边界模糊不清。该主诉牙的治疗应选用（）
A.拔除
B.干髓治疗
C.塑化治疗
D.根管治疗
E.根尖诱导形成术
参考答案：E
解析：由题目可知，年轻恒牙的慢性根尖周炎，因为年轻恒牙的牙根尚未发育完全，但发生严重牙髓病变，如牙髓坏死，盖髓术不可用时，根尖诱导形成术可以促进年轻恒牙的牙根继续发育和根尖形成，所以E正确。考点：年轻恒牙的治疗
| 从下面方框中选择适当的选项填人短文中，使短文通顺、完整。选项中有两个选项是多余选项。 | |
table 1 the back wall, and then the little old man walked to the cash register (收银员) to order food. After a while he got the food and 2 began to open it. There 3 one hamburger, some French fries and one drink. The little old man cut the hamburger 4 in half and divided the French fries into two piles(堆). Then he put the half of the food in front of his 5 .He took a sip (一小口) of the drink and his wife took a sip. "How 6 the old people are ! " The people around them thoght. As the man began to eat his hamburger and Frcnch fries, his wife sat there watching him and took turns to drink. A young man came over and offered to buy another meal for them, 7 they refused politely and said they had been used to 8 everything. Then a young lady asked the old lady a question. "Madam, 9 aren't you cating? You said that you shared 10 .Then what are you waiting for?""The teeth," she answered. |