Resonance frequency analysis of orthodontic miniscrews subjected to light-emitting diode photobiomodulation therapy

Abstract

The aim of this prospective experimental study was to evaluate the effect of light-emitting diode (LED) photobiomodulation therapy (LPT) on the stability of immediately loaded miniscrews under different force levels, as assessed by resonance frequency analysis (RFA). Sixty titanium orthodontic miniscrews with a length of 8 mm and a diameter of 1.4 mm were implanted into cortical bone by closed flap technique in each proximal tibia of 15 New Zealand white adult male rabbits (n = 30). The animals were randomly divided into irradiated and control groups under different force levels (0, 150, and 300 cN). OsseoPulse® LED device (Biolux Research Ltd.) 618 nm wavelength and 20 mW/cm(2) output power irradiation (20 minutes/day) was applied to the miniscrews for 10 days. The RFA records were performed at miniscrew insertion session (T1) and 21 days after surgery (T2). Wilcoxon and Mann-Whitney U-tests were used for statistical evaluation at P < 0.005 level. It was found that initial primer stability of all miniscrews was similar in all groups at the start of the experimental procedure. Statistically significant differences were found for changes in implant stability quotient (ISQ) values between LED-photobiomodulated group and the control (0 cN, P = 0.001; 150 cN, P < 0.001; and 300 cN, P < 0.001). Significant increase was found in ISQ values of LPT applied miniscrews under 0 cN (+11.63 ISQ), 150 cN (+10.50 ISQ), and 300 cN (+7.00 ISQ) force during observation period. By the increase of force levels, it was determined that ISQ values decreased in non-irradiated control miniscrews. Within the limits of this in vivo study, the present RFA findings suggest that LPT might have a favourable effect on healing and attachment of titanium orthodontic miniscrews.

Histomorphometric Evaluation of the Effects of Various Diode Lasers and Force Levels on Orthodontic Mini Screw Stability

“…A pilot study was performed just before the experimental stage of this research, in which the mini screws were placed in the tibia of the rabbits; [24][25][26] however, unfortunately it was detected that the legs of the animals were broken because of the weak bone structure. It was thought that length of the mini screw could be the cause of the fracture, but as the most commonly used length of the mini screws is 8 mm in orthodontic practice, it was decided to change the experimental bone to the fibula, rather than changing the dimension of the mini screw.…”

Measurement of mini-implant stability using resonance frequency analysis

“…This can be useful for stability measurement in animal studies if it is made accurately, but for clinical use this would prevent attaching any kind of mechanics for tooth movement. 28 The mini-implants used in this study have an industrially fabricated inner thread at the top. It is made for fixation of prefabricated abutments to create different kind of mechanics.…”

Effects of Light-Emitting Diode Photobiomodulation Therapy and BioOss as Single and Combined Treatment in an Experimental Model of Bone Defect Healing in Rats

“…44 In another study by OsseoPulse ® LED device, a favorable effect on healing and stability of 12 titanium orthodontic miniscrews was reported. 45 The results of our study and those of others indicated that bone irradiated with LED arrays showed increased neovascularization, collagen deposition, and bone neorformation compared to non-irradiated bone. In addition to these studies, our results have demonstrated that the use of BioOss ® is effective in the healing of bone defects and that combining it with LPT improves the outcomes of this therapeutic approach.…”