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Korean J Orthod 2020; 50(2): 73-74

Published online March 25, 2020 https://doi.org/10.4041/kjod.2020.50.2.73

Copyright © The Korean Association of Orthodontists.

Reader's Forum

Heekyu Jung

Department of Orthodontics, The Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, Korea.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Won-Young Park, Min Soo Kim, Min-Seok Kim, Min-Hee Oh, Su-Young Lee, Sun-Hun Kim, Jin-Hyoung Cho

Effects of pre-applied orthodontic force on the regeneration of periodontal tissues in tooth replantation.

- Korean J Orthod 2019;49:299–309

I thank the authors for the interesting article. I would like to ask them the following questions.

Q1. In the study 7-week-old rats were used to investigate effect of pre-applied orthodontic force on the periodontal ligament (PDL) healing after replantation. Can you explain how the PDL healing or gene expression changes according to maturity of the root?

Q2. Also, I would like to ask how the outcomes would be if the orthodontic force is applied after, instead of before, replantation.

Q3. In this study orthodontic force was applied 50 cN. How do you think PDL healing or gene expression might change if you applied orthodontic force more or less than 50 cN?