Spring-Assisted Molar Intrusion in Clear-Aligner Treatment.

@article{Ruan2017SpringAssistedMI,
  title={Spring-Assisted Molar Intrusion in Clear-Aligner Treatment.},
  author={Meng-Jiao Ruan and Ruo-ping Jiang},
  journal={Journal of clinical orthodontics : JCO},
  year={2017},
  volume={51 5},
  pages={270-278}
}