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Inactivated periods of constant orthodontic forces related to desirable tooth movement in rats

Tokyo Medical and Dental University, Japan

Dr T. Kameyama, Orthodontic Science, Department of Orofacial Development and Function, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1–5–45 Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan. E-mail:
kame.orts{at}tmd.ac.jp

Abstract

Aim: To examine the effects of inactive periods of force on the amount of tooth displacement and root resorption during experimental tooth movement in rats.

Sample: Sixty 11-week-old male Sprague-Dawley rats.

Method: The maxillary first molar (M1) was moved mesially using a removable titanium-nickel alloy closed coil spring for 14 days. The rats were divided into four groups with, 0, 1, 4, and 9 hours of inactivation per day.

Results: Tooth displacement in the 0- and 1-hour groups was significantly greater than that in the 9-hour group. The area of root resorption in the 4- and 9-hour groups was significantly less than that in the 0- and 1-hour groups. There was no significant difference in root resorption between 0- and 1-hour groups, and also between 4- and 9-hour groups.

Conclusion: The distance of tooth displacement gradually decreased as the inactive period increased, whereas root resorption suddenly decreased between 1 and 4 hours of inactive orthodontic force.