Clinical and morphological assessment of low frequency ultrasound use in delayed eruption of teeth

Aim. Development of a new method stimulating eruption of impacted teeth, reducing side effects and the term of orthodontic treatment. Methods. Considering the high numbers of patients who sought medical aid with delayed eruption of teeth, rational method of low-frequency ultrasound was used for stimulating eruption of impacted teeth. The stimulation process was performed by «SIAZ-EGS Med-Stomo» device, with the oscillation frequency of 26.5 kHz, intensity of 1 W/cm, amplitude of 40-60 μm, a wavelength 0,012 m, developed in Azerbaijan. Clinical and morphological methods, including examination of gingival tissue biopsies from the area where low-frequency ultrasound was applied, were used. After clinical and radiographic examination and identifying the impacted tooth with a favorable location on dental panoramic radiography, if there was a space in the tooth row, the area of the tooth projection at the gum was directly affected by low-frequency ultrasound daily or every other day for 5-10 seconds. An average of 1-5 procedures up to the tooth eruption was performed. Results. Microscopy of epithelial cover and stroma proved the absence of inflammation, thickening of outermost layer on the gum surface. Cells of the intermediate layer revealed the intact nucleus, loosening with linear swelling and cell dissociation. Cellular and tissue changes in gingival tissue seen after the treatment with low-frequency ultrasound may indicate the boosting of the impacted teeth eruption due to the syndrome of molecular contusion, improving the microcirculation and loosening the gum tissues. Conclusion. The results of comprehensive orthodontic treatment using low-frequency ultrasound ito stimulate the eruption of impacted teeth may be recommended for practical use.