第一章 单元测试

1、 问题: Which of the following statements is not true（ ）。
选项：
A:Conventional fixed appliances move the tooth by bouncing back the arch wire.
B:In clear aligner technology, the appliances move the tooth by pressing the attachment and tooth surface.
C:Clear aligners move the tooth in the form of pulling.
D:Clear aligner technology and conventional fixed appliance technology have a consistency of treatment principles and basic principles.
答案: 【
Clear aligners move the tooth in the form of pulling.
】

2、 问题: Which of the following attachments is conventional attachment？（ ）。
选项：
A:virtual attachment
B:power ridge
C:window attachment
D:beveled attachment
答案: 【
beveled attachment
】

3、 问题:Which of the following statements are true（ ）
选项：
A:A small round wire of soft material offers less engagement and smaller control on the teeth.
B:A large square wire with strong rigidity can effectively adjust teeth in various aspects, including axial inclination, torque, inset and outset.
C:The greater the surface area of the tooth, the better the engagement of clear aligner.
D:No need to wrap the aligner to the last tooth in cases of sequential molar distalization.
答案: 【
A small round wire of soft material offers less engagement and smaller control on the teeth.
A large square wire with strong rigidity can effectively adjust teeth in various aspects, including axial inclination, torque, inset and outset.
The greater the surface area of the tooth, the better the engagement of clear aligner.
】

4、 问题: In 2003, the home-made stealthy appliance system without bracket with independent intellectual property rights has been successfully developed and obtained the national invention patent and utility model patent.（ ）
选项：
A:对
B:错
答案: 【
对
】

5、 问题: Conventional attachments are automatically placed by the software when it detects certain thresholds of tooth movement.（ ）
选项：
A:对
B:错
答案: 【
错
】

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