关键词: 转矩, 上前牙, 无托槽隐形矫治

Abstract: In the orthodontic treatment，the torque of the anterior and posterior teeth is a crucial factor in forming a beautiful smile line and establishing an appropriate occlusal relationship and maintaining the long-term stability of orthodontic effect. Because of its being aesthetic and comfortable，clear aligners have become one of the first options of patients in clinical practice. However，the achievement and accuracy of its control on the torque of anterior teeth need to be increased. How to accurately realize the torque movement of the anterior teeth when using the clear aligners is the hotspots and difficulties of clinicians′attention. Therefore，this article reviews the influencing factors of clear aligners in the torque control of upper anterior teeth，in order to provide guidance for clinical plan design and material selection.

Key words: torque, upper anterior teeth, clear aligner treatment