The effect of photobiomodulation on root resorption during orthodontic treatment

Ghada Nimeri, Chung H Kau, Rachel Corona, Jeffery Shelly, Ghada Nimeri, Chung H Kau, Rachel Corona, Jeffery Shelly

Abstract

Photobiomodulation is used to accelerate tooth movement during orthodontic treatments. The changes in root morphology in a group of orthodontic patients who received photobiomodulation were evaluated using the cone beam computed tomography technique. The device used is called OrthoPulse, which produces low levels of light with a near infrared wavelength of 850 nm and an intensity of 60 mW/cm(2) continuous wave. Twenty orthodontic patients were recruited for these experiments, all with class 1 malocclusion and with Little's Irregularity Index (>2 mm) in either of the arches. Root resorption was detected by measuring changes in tooth length using cone beam computed tomography. These changes were measured before the orthodontic treatment and use of low-level laser therapy and after finishing the alignment level. Little's Irregularity Index for all the patients was calculated in both the maxilla and mandible and patients were divided into three groups for further analysis, which were then compared to the root resorption measurements. Our results showed that photobiomodulation did not cause root resorption greater than the normal range that is commonly detected in orthodontic treatments. Furthermore, no correlation between Little's Irregularity Index and root resorption was detected.

Keywords: accelerate tooth movement; cone beam computed tomography; orthodontics; photobiomodulation; root resorption.

Figures

Figure 1
Figure 1
Measuring the changes in root length by cone beam computed tomography. Notes: Tooth length measurements were carried out by using a cone beam computed tomography radiograph. The measurements were taken from the highest incisal edge of the tooth to the highest point of the apex. As shown here, the upper-left central incisor is about 24.7 mm, and the lower left central is 22.3 mm.

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