问题
单项选择题
牙体有较大缺损，在制作金属烤瓷全冠的基底冠时。若蜡型厚度均匀一致，容易产生的结果是（）
A．瓷层厚，能较好地恢复瓷层感
B．爆瓷
C．金属底层冠适合性好
D．瓷裂，瓷变形
E．浪费瓷粉
答案
参考答案：D
解析：
如基底冠的蜡型厚度一致，则缺损部分由瓷恢复，瓷层过厚会引起瓷裂和变形。
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牙体有较大缺损，在制作金属烤瓷全冠的基底冠时。若蜡型厚度均匀一致，容易产生的结果是（）
A．瓷层厚，能较好地恢复瓷层感
B．爆瓷
C．金属底层冠适合性好
D．瓷裂，瓷变形
E．浪费瓷粉
参考答案：D
解析：
如基底冠的蜡型厚度一致，则缺损部分由瓷恢复，瓷层过厚会引起瓷裂和变形。
A daughter thought life was unpromising(无前途的) to her and complained to her father about it. She did not know how she was going to and wanted to give up. She was of fighting and struggling. It seemed as if one problem was just solved before a new one . Her father, a cook, took her to the . He filled three pots with water and placed each on a high . Soon the pots came to the . In one he placed carrots, in the second he placed eggs, and the last he placed ground coffee beans. He let them sit and boil, without saying a word. The daughter sucked her teeth and waited, asking repeatedly what he was doing. In about twenty minutes he turned off the He fished the carrots out and placed them in a bowl. He pulled the eggs out and placed them in a bowl. Then he spooned the coffee out and placed it in another. Turning to her he asked, “Darling, what do you see?” “Carrots, eggs, and coffee,” she replied. He brought her closer and asked her to the carrots. She did and noted that they were soft. He then asked her to take an egg and break it. After pulling off the , she observed the hard-boiled egg! Finally, he asked her to taste the coffee. She smiled she tasted its rich flavor. She humbly asked, “What does it mean, Father?” He explained that each of them had faced the same , boiling water, but each differ- ently. The carrot went in and hard. But after being subjected to the boiling water, it and became weak. The egg had been . Its thin outer shell had protected its liquid interior. But after sitting the boiling water, its inside became hardened. The ground coffee beans were unique, . After they were in the boiling water, they had the water. “Which are you?” he asked his daughter. “When adversity(逆境) knocks on your door, do you respond? Are you a carrot, an egg, or a coffee bean?”
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