THE METHOD OF THE FORMATION OF OCCLUSIVE PLANE OF UPPER BITE TORUS AND THE DRAWING OF OCCLUSION WITH THE ADVANCED DEVICE BY N. I. LARIN

Abstract

The clinical and mathematical studies of the drawing of occlusion “by sight” and the adequacy of the occlusive planes, formed on the level of premolars (the area of the greatest intensity of facial muscles) and device by N.I.Larin, were held to improve the method of the formation of occlusive plane and the device for its performance. On the grounds of 288 measurements it was determined, that anthropometric lines are shifted both medially and laterally relative to the true landmarks, but more often they were shifted laterally by 2.64±0.019 mm at the right and 2.15 ± 0.021mm at the left, and the level of occlusive plane at the area of premolars was higher than the true one by 3.25± 0.011 mm at the right and by 3.6 ± 0.018 mm at the left. The improvement of the device by Larin consists of the introduction into its construction of two additional remova-ble carriages: a) one – for the exact formation of occlusive plane in accordance to the line of pupils; b) another – for the precise drawing of anthropometric lines, i.e. for drawing of occlusion. The formation of the occlusive plane at lateral parts of bite torus with the device by Larin is reasonable to be done after the fixation of the frontal group of teeth. The comparative clinical studies of the use of the suggested method and the device for its performance at prosthetics of 17 patients (the main group) with total adentia were carried out; the control group consisted of 15 patients – occlusive plane for denture production for whom was formed with method by Larin. The age of the patients is from 62 to 70 years old. The chewing effectiveness according to RubinovI.S. and chew-ing index according to Kondrashov V.A. were higher in the patients from the main group in 6 months by 4.78 % and 3.51mg/s. Good fixation and stabilization of dentures of the main group of patients were also higher by 73.3 % and 58.8 % of cases correspondingly against 53.3% and 41.2% in control group.