Three-dimensional crown–root movement in first premolar extraction cases treated with two clear aligner systems based on different materials: a retrospective cohort study
Luyao Qu, Runzhe Fang, Ruomei Li, Zitong Yang, Yixin Li, Xuehui Chen, Boxi Chen, Jian Wang, Lingjun Yuan, Lunguo Xia, Bing Fang · 2026
Read Three-dimensional crown–root movement in first premolar extraction cases treated with two clear aligner systems based on different materials: a retrospective cohort study by Luyao Qu, Runzhe Fang, Ruomei Li, Zitong Yang, Yixin Li, Xuehui Chen, Boxi Chen, Jian Wang, Lingjun Yuan, Lunguo Xia, Bing Fang (2026) in the Tower of Babel, a free online library of public-domain works preserved in clean, searchable text. No sign-up. The full text is served as a plain-text file at a predictable URL, where text is present: https://antarctic-labs.com/tower-of-babel/pmc-13212943.txt.
Description
Luyao Qu leads a team comparing in 2026 how accurately two clear aligner brands move teeth when a first premolar has been removed to make space. The brands use different plastics, which may grip crowns and roots with different fidelity.
Records for 29 patients combined cone-beam scans with mouth scans taken before and after treatment, aligned on stable palate ridges. Neither system differed clearly on pulling back the upper front tooth crown. One brand placed roots of two back teeth closer to plan, while the other controlled premolar tilt and torque better. Both showed the same unwanted tipping pattern. Material choice, the authors conclude, trades off by tooth and direction.
Catalog record
| CREATOR | Luyao Qu, Runzhe Fang, Ruomei Li, Zitong Yang, Yixin Li, Xuehui Chen, Boxi Chen, Jian Wang, Lingjun Yuan, Lunguo Xia, Bing Fang |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 34 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |