第一章测试1. Which of the following statements is not true（ ）。
A:Clear aligners move the tooth in the form of pulling. B:Conventional fixed appliances move the tooth by bouncing back the arch wire. C:Clear aligner technology and conventional fixed appliance technology have a consistency of treatment principles and basic principles. D:In clear aligner technology, the appliances move the tooth by pressing the attachment and tooth surface.
答案:A
2. Which of the following attachments is conventional attachment？（ ）。
A:window attachment B:power ridge C:virtual attachment D:beveled attachment
答案:D
3.Which of the following statements are true（ ）
A:A small round wire of soft material offers less engagement and smaller control on the teeth. B:No need to wrap the aligner to the last tooth in cases of sequential molar distalization. C:The greater the surface area of the tooth, the better the engagement of clear aligner. D:A large square wire with strong rigidity can effectively adjust teeth in various aspects, including axial inclination, torque, inset and outset.
答案:ACD
4. 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.（ ）
A:对 B:错
答案:A
5. Conventional attachments are automatically placed by the software when it detects certain thresholds of tooth movement.（ ）
A:错 B:对
答案:A
