患者女，22岁。
龋损已完成治疗，要求做金属烤瓷冠。患者的牙弓弧度和邻牙突度均正常。在恢复颊舌侧轴面突度时，外形高点恢复正确的是（）
A.颊侧中1/3
B.颊侧颈1／3
C.颊侧牙合1／3
D.舌侧颈1/3
E.舌侧中1／3
参考答案：C
解析：轴面突度使食物滑下时对牙龈起按摩作用；唇（颊）舌面突度过小时牙龈会受到食物过度冲击创伤；唇（颊）舌面突度过大时牙龈会因失去食物按摩而萎缩；邻面的突度有防止食物嵌塞的作用。对于下颌第一磨牙，轴面突度应恢复到颊侧牙合1／3，故选C。
选词填空：用适当形式填空，每空限用一次。
Your body grows more while you are asleep. No one can live without sleeping. If a child is tired, he needs 4 sleep than usual. You will be tired or will not be able to listen to your teachers in class or can’t work well if you do not have 5 sleep at night. A baby will cry 6 if you wake him or her up when he or she is sleeping. You will be able to do well in your lessons if you 7 enough rest. Many students hope to learn more before rests, so they study till 8 at night. But they feel very tired in the day and they may forget more. Boys and girls of eight or nine need ten 9 of sleep every night. Get enough sleep if you want to be strong and 10 . |