Clinical possibilities of applying the method of photostatic biometrics of plaster models of jaws

Abstract

The development of modern methods of biometrics is an urgent task of clinical dentistry. Aim. To determine the clinical possibilities of applying the method of photostatic biometrics of plaster models of jaws.
 Material and methods. A retrospective study was conducted on 46 pairs of plaster jaw models with physiological occlusion. Biometrics of jaw models from plaster was carried out according to generally accepted methods. The method of photostatic biometrics of jaw models is based on photographing models with a ruler for the convenience of subsequent scaling. The photo was marked with landmarks and reference lines in various directions.
 Results. The depth of the dental arch, or molar sagittal of the upper arch, when measured on the models was (44.16 ± 1.14) mm, and in the photo – (47.31 ± 1.29) (p ˂ 0.05). On the lower jaw, the dimensions were (44.86 ± 1.05) mm and (40.46 ± 1.2) mm, respectively (p ˂ 0.05). The differences in the size of the arc depth are explained by the complexity of the biometrics of plaster models and the determination of the landmark (conditional transversal) using a conventional caliper and ruler. Rotation angles of the second molars averaged (15.01 ± 0.21) degrees on the upper jaw and (12.49 ± 0.18) degrees on the lower arch. The first upper molars were rotated at (19.96 ± 0.22) degrees, and the lower ones were slightly smaller (17.52 ± 0.16) degrees.
 Conclusion. Thus, the method of photostatic biometrics of plaster models of jaws can be used as an additional study designed to assess the position of key teeth and interstitial point when superimposed on the model of various geometric shapes and the template of the individualized dental arch and allows you to determine the angles of rotation of the teeth.