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Impact of LED Photobiomodulation on Orthodontic SpaceClosure Rates: Evaluation of Application Time and EnergyDose

Seung Hoon Lee, Sang Ho Noh, Young-Guk Park, Kyung-A Kim
Department of Orthodontics, Kyung Hee University School of Dentistry, Seoul, Korea

Purpose: We evaluated how the use of an intraoral light-emitting diode (LED) device affects the rate of tooth movement during the space closure stage based on daily application time and energy dose. Materials and Methods: Forty-two patients who underwent the first premolar extraction were randomly divided into three groups. Groups A and B were experimental groups that underwent photobiomodulation using an LED (850 nm wavelength, 60 mW/cm2 power density) during the space closure phase. Group A received 3 min of treatment daily with a total energy dose of 10.8 J/cm2 , whereas Group B received 5 min of treatment with a total energy dose of 18.0 J/cm2 . Group C served as the control group and underwent standard space closure procedures. Dental models of the maxillary teeth were obtained at 1-month intervals, and the rate of space closure (mm/month) was measured using model analysis. Lateral cephalometries were obtained at the beginning and end of the space closure phase to determine the anchorage values and tooth movement patterns that occurred during space closure.

Results: Groups A and B (Group A: 0.90±0.24 mm/month, Group B: 0.83±0.17 mm/month) demonstrated significantly faster space closure than Group C (0.62±0.12 mm/month)—with increased speeds of 1.45-fold and 1.34-fold, respectively. There was no significant difference in the rate of space closure between Groups A and B. The three groups showed no significant differences in the anchorage value and tooth movement pattern during space closure. LED application increased the rate of space closure, and energy doses in the range of 10.8-18.0 J/cm2 effectively induced biological stimulation. Conclusion: LEDs may help reduce the duration of orthodontic treatment and provide foundational data for establishing efficient applications.

Key words: Photobiomodulation, Light-emitting diode, Space closure

Korean J Lingual Orthod 2023;12(1):1-10

01)KJLO (1-10)_23-102
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