Digital fabrication and application of clear aligner after alignment with NiTi archwires

Lim,  Sung-Hoon

J Korean Dent Assoc > Volume 54(7); 2016 > Article

The Journal of The Korean Dental Association 2016;54(7):551-562.
Published online July 31, 2016.

NiTi 호선을 이용한 초기 배열 후 디지털 방식 투명교정장치의 적용

임성훈

조선대학교 치과대학 치과교정학교실

Digital fabrication and application of clear aligner after alignment with NiTi archwires

Sung-Hoon Lim

Department of Orthodontics, School of Dentistry, Chosun University

Abstract

There are interferences between the teeth to be moved and the clear aligner made from setup. These interferences generate forces which move teeth to the desired position. However, these can cause incomplete tooth capture of clear aligner. When these interferences exceed the acceptable deformation of aligner, unwanted intrusion of teeth to be moved occurs. When correction of rotation or tipping of teeth is attempted, intrusion prevails before rotation or tipping. However, clear aligner can induce labiolingual tipping or intrusion easily. To achieve preliminary alignment including control of rotation and tipping, NiTi archwires with fixed appliance can be used first, and then clear aligner can be used for finishing in mild Class I maloccusion cases. For this purpose, clear aligner can be made using a digital setup and 3D printing. To move teeth using a clear aligner, tooth capture is critical. To improve tooth capture of clear aligners, slingshot or vertical elastics can be used. These were discussed with illustrations.

Key Words: clear aligner;digital setup;3D printing;