浙江大学
第一章单元测试
- Which of the following statements is not true（ ）。
- Which of the following attachments is conventional attachment？（ ）。
- Which of the following statements are true（ ）
- 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.（ ）
- Conventional attachments are automatically placed by the software when it detects certain thresholds of tooth movement.（ ）
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:Clear aligners move the tooth in the form of pulling.
A:window attachment B:beveled attachment C:virtual attachment D:power ridge
答案:beveled attachment
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:No need to wrap the aligner to the last tooth in cases of sequential molar distalization. D:The greater the surface area of the tooth, the better the engagement of clear aligner.
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.
A:错 B:对
答案:对
A:错 B:对
答案:错
