问题 问答题 简答题

简述修复治疗中如何预防牙髓损伤。

答案

参考答案:

(1)牙体预备时选用小而锐利的工具,加速工具转动速度,车针对牙体压力适当(20~60g)。采用间隙性切割方法,配以水雾冷却方法有效降低热刺激。

(2)对髓腔较大的年青患者备牙时应该小心,需要熟悉牙体解剖,必要时拔髓以后再作牙体预备。对于局麻下的牙体预备,由于患者不能对牙髓刺激做出反应,操作更应该小心。

(3)牙体预备尽量一次完成,并且要去尽龋坏组织。

(4)为了避免取模对牙髓的冷刺激,可在取模前对预备牙涂脱敏剂,吹干后取模。

(5)采用正确方法制作自凝塑料暂冠。最好采用不产热的自凝塑料制作暂冠,并且采用对牙髓刺激作用小又有安抚作用的丁香油氧化锌糊剂粘接暂冠。

(6)修复体粘接前不能够用烈性的消毒剂和苛性钠脱水药物。一般采用75%的酒精消毒。如果预备牙有过敏症状,粘固前可在其表面涂氢氧化钙溶液,以中和粘固剂的酸性,并使用生物相容性好的粘固剂。

(7)修复体初戴或者粘固以后再作一次咬合检查,如有早接触及干扰应及时调。

(8)固定修复体边缘线要短并位于自洁区,边缘要与牙体组织密合。牙体预备要有一定固位形和抗力形等合理设计,避免继发龋。干扰应及时调。

单项选择题

I was a single parent of four small children, working at a low paid job. Money was always tight, but we had a (1) over our heads, food on the table, clothes on our backs, and if not a lot, always (2) . Not knowing we were poor, my kids just thought I was (3) . I’ve always been glad about that.

It was Christmas time, and although there wasn’t (4) for a lot of gifts, we planned to celebrate with a family party. But the big (5) for the kids was the fun of Christmas (6) .

They planned weeks ahead of time, asking (7) what they wanted for Christmas. Fortunately, I had saved MYM120 for (8) to share by all five of us.

The big (9) arrived. I gave each kid a twenty-dollar bill and (10) them to look for gifts of about four dollars each. Then everyone scattered. We had two hours to shop; then we would (11) back at the "Santa’s Workshop"

Driving home, everyone was in high Christmas spirits, (12) my younger daughter, Ginger, who was unusually (13) She had only one small, flat bag with a few candies—fiftycent candies I was so angry, but I didn’t say anything (14) we got home. I called her into my bedroom and closed the door, (15) to be angry again. This is what she told me.

"I was looking (16) thinking of what to buy, and I (17) to read the little cards on the ’Giving Trees’. One was for a little girl, four years old, and all she (18) for Christmas was a doll. So I took the card off the tree and (19) the doll for her. We have so much and she doesn’t have anything. "

I never felt so (20) as I did that day.

13().

A.day 

B.chance 

C.cheque 

D.tree

单项选择题