1 research outputs found
Histomorphometric Evaluation of the Effects of Various Diode Lasers and Force Levels on Orthodontic Mini Screw Stability
Objective: The purpose of this study was to evaluate the effects of
different laser dose and force levels on the stability of orthodontic
mini screws used for anchorage, by histomorphometric analyses.
Background data: Low-level laser therapy speeds up blood flow, improves
the mechanism of the revitalization processes, reduces the risk of
infection, boosts metabolic activities, and accelerates the healing of
the damaged tissue. Although there are many research studies about
low-level laser therapy applications in a variety of areas, no
investigations were found concerning mini screw stability using various
laser dose levels with different force level applications. Methods:
Seventeen New Zealand white rabbits were used. A total of 68
cylindrical, self-drilling orthodontic mini screws were threaded at the
fibula. Experimental subjects were divided into six groups; force
application was not performed in the first three groups, whereas 150g of
force was applied via nickel-titanium closed-coil springs placed between
two mini screws in the other three groups. Measurements of the initial
torque values (10 Ncm) were manipulated by a digital portable torque
gauge. Various low-level laser doses were applied to the groups during
the postoperative 10 days. After 4 weeks, bone-to-implant contact and
cortical bone thickness were histomorphometrically analyzed. Results: In
the 150g force plus 20 J/cm(2) dosage group, the highest bone-to-implant
contact values were observed. (p<0.05) There were no statistically
significant correlations between cortical bone thickness and
bone-to-implant contact values; on the other hand, no significant
difference was found among the same groups in terms of cortical bone
thickness values (p>0.05). Conclusions: Low-level laser therapy was
noticed to induce the mini screw-bone contact area. Low-level laser
therapy may be a supplementary treatment method to increase the
stability of the orthodontic mini screw