Evaluation of Root Resorption During the Correction of Deep Bite With the Help of Laser Irradiation
Condition: Deep Overbite
MeSH terms: Root Resorption; Overbite; Malocclusion, Angle Class II
Study type: Interventional

Summary: 
      This study aims to investigate the effectiveness of low-level laser in reducing the
      resorption of the roots of the upper incisors. Participants will be recruited from patients
      who will attend the Department of Orthodontics and Dentofacial Orthopaedics at Damascus
      University. The study sample will consist of 30 patients with a deep bite who will be
      randomly distributed equally into two groups, 15 patients in each group, average age:
      22.37±3.38 years. Mini-implants will apply between the roots of the maxillary central and
      lateral incisor at both sides with a loading force of 40 g on each end by using a
      nickel-titanium spring extending from the head of the mini-implants to a wire welded to it
      with two hooks. A low-level laser (Ga-Al-As) will be used with 808 nm wavelength in
      continuous mode, 250 milli-Watt power output, 4 Joules/point energy density, 16 s per point
      in the experimental group. It will be applied on the day of intrusion, then on days 3,7, and
      14 of the first month, and then every 15 days starting from the second month until the end of
      the intrusion. In addition to adjusting the force gauge every 4 weeks until the end of the
      intrusion stage and reaching normal coverage will be activated every 4 weeks in both groups
      until normal overbite was reached.
    

Detailed description: 
      Several studies have indicated the effectiveness of the LLLT in accelerating orthodontic
      movement, but studies that have evaluated the role of this laser in reducing the risk of
      OIIRR have been limited. Moreover, the effects of laser in reducing root resorption have been
      studied with different types of orthodontic movements such as en masse anterior retraction,
      canine retraction, and tilting of the premolars before extraction, but they have not been
      studied with the intrusion movement
    

Intervention name(s): Traditional orthodontic treatment; Low-Level Laser
Intervention type(s): Device; Device
Intervention description(s): As for patients in the control group, the strength of the nickel-titanium coil will be adjusted every 4 weeks to the required strength of 40 g on each end until reaching normal coverage.; The laser will be applied to the root of each of the upper incisors in 8 points (4 points from the labial and 4 points from the palatine), and the head of the device will be placed from the labial side of the root in the center of each of the apical and middle thirds and the mesial and distal of the cervical third in contact with Oral mucosa perpendicular to the root axis, with the application of the laser beam for (16) seconds at one point, and the laser will be re-applied in the same way from the palatal side of the root. So that it was the total application time is (128) seconds for one tooth.
The laser will be applied on the day the upper incisor intrusion started (T1), then on days (3, 7, and 14) of the first month, and starting from the second month, the laser will be applied every (15) day, in addition to adjusting the force gauge every 4 weeks until the end of intrusion stage (T2) and reaching normal coverage.
Allocation: Randomized
Intervention model: Parallel Assignment
Masking: Single (Outcomes Assessor)
Primary purpose: Treatment
Keywords: Low-level laser; Deep bite; Mini-implants; Root resorption