Effects of low-level laser irradiation on the rate of orthodontic tooth movement and associated pain with self-ligating brackets
Volume 152, Issue 5, November 2017, Pages 622–630
Introduction
The
aim of this study was to evaluate the effect of low-level laser
irradiation applied at 3-week intervals on orthodontic tooth movement
and pain associated with orthodontic tooth movement using self-ligating
brackets.
Methods
Twenty-two
patients (11 male, 11 female; mean age, 19.8 ± 3.1 years) with Angle
Class II Division 1 malocclusion were recruited for this split-mouth
clinical trial; they required extraction of maxillary first premolars
bilaterally. After leveling and alignment with self-ligating brackets
(SmartClip SL3; 3M Unitek, St Paul, Minn), a 150-g force was applied to
retract the canines bilaterally using 6-mm nickel-titanium closed-coil
springs on 0.019 x 0.025-in stainless steel archwires. A
gallium-aluminum-arsenic diode laser (iLas; Biolase, Irvine, Calif) with
a wavelength of 940 nm in a continuous mode (energy density, 7.5 J/cm2/point; diameter of optical fiber tip, 0.04 cm2)
was applied at 5 points buccally and palatally around the canine roots
on the experimental side; the other side was designated as the placebo.
Laser irradiation was applied at baseline and then repeated after
3 weeks for 2 more consecutive follow-up visits. Questionnaires based on
the numeric rating scale were given to the patients to record their
pain intensity for 1 week. Impressions were made at each visit before
the application of irradiation at baseline and the 3 visits. Models were
scanned with a CAD/CAM scanner (Planmeca, Helsinki, Finland).
Results
Canine
retraction was significantly greater (1.60 ± 0.38 mm) on the
experimental side compared with the placebo side (0.79 ± 0.35 mm) (P <0 .05="" 1.4="" 2.4="" after="" and="" application="" at="" compared="" day="" experimental="" first="" less="" llli="" nbsp="" of="" on="" only="" p="" pain="" placebo="" second="" side="" sides="" significantly="" the="" visit="" was="" with="">
Conclusions
Low-level
laser irradiation applied at 3-week intervals can accelerate
orthodontic tooth movement and reduce the pain associated with it.
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