问题 单项选择题 B1型题

金属烤瓷冠预备体唇面磨除厚度是()

A.0.3mm

B.0.5mm

C.0.9mm

D.1.2mm

E.2.0mm

答案

参考答案:D

解析:本题考查的是铸造金属全冠和金属烤瓷冠牙体预备的要求,以及金属烤瓷冠的制作要求。牙体缺损修复在牙体预备时应尽量少磨除健康牙体组织,但必须为修复体预备出足够的修复空间,既要保证修复体和预备体有足够的抗力,还要保证修复体的固位和功能效果。题1:铸造金属全冠牙体制备时面磨除厚度一般为1.0mm,最薄不能小于0.5mm,否则铸造金属全冠面过薄,强度差,容易磨耗穿孔。正确答案应选B。题2:前牙金属烤瓷冠预备体唇面磨除厚度为1.2mm,以保证基底冠和瓷层有足够的厚度。预备量不足、瓷层厚度过薄,美观效果差。预备量过大,易导致牙本质敏感,甚至露髓。正确答案是D。题3:金嘱烤瓷冠的基底冠厚度通常为0.5mm。基底冠过厚,瓷层相对变薄。基底冠过薄,强度不够。其厚度不能小于0.3mm。正确答案选A。

阅读理解

阅读理解。

     Mrs Brown had a small garden behind her house and in the spring she planted some vegetables in it.

She looked after them very carefully, and when the summer came, they looked very nice.

     One evening Mrs Brown looked at her vegetables and said, "Tomorrow I am going to pick them and

we can eat them."

     But early the next morning, her son ran into the kitchen and shouted, "Mother, Mother! Come

quickly! Our neighbour's ducks are in the garden and they are eating our vegetables!"

     Mrs Brown ran out, but it was too late. All the vegetables were finished! Mrs Brown cried, and her

neighbour was very sorry, but that was the end of the vegetables.

     Then a few days before Christmas, the neighbour brought Mrs Brown a parcel. In it was a beautiful

fat duck. And on it was a piece of paper with the words, "ENJOY YOUR VEGETABLES!"

1. Mrs Brown had a _____ behind her house.

A. shed        

B. small garden        

C. an apple orchard  

D. small house

2. In _____ she planted some vegetables in the garden.

A. the summer    

B. the winter          

C. the autumn        

D. the spring

3. When _____ came, the vegetables looked very nice.

A. the summer    

B. the winter         

C. the autumn        

D. the spring

4. Early the next _____ her son ran into the kitchen and shouted.

A. morning        

B. afternoon        

C. evening        

D. night

5. One morning _____ were eating vegetables in the garden.

A. donkeys        

B. ducks            

C. pigs            

D. chickens

单项选择题