ASSESSMENT OF THE STRESS-STRAIN STATE OF PIN STRUCTURES AND CROWNS OF TEETH USED TO RESTORE THE LOST CROWN PART OF THE TOOTH IN A DECOMPENSATED FROM OF PATHOLOGICAL ABRASION.

Abstract

BACKGROUND: Restoration of the height of the crown part of the tooth in the decompensated form of pathological abrasion consists of measures for the reconstruction of the general aesthetic appearance, manifestations, manifestations occur in the temporomandibular joint. However, even very unusual crowns are rare. Often there is a deformation of orthopedic structures, fractures of the roots used as a support for the orthopedic structure are possible.
 The use of reverse engineering methods makes it possible to transfer the traditional technique of manufacturing dentures into the framework of digital technology and to create a biomechanically sound individual orthopedic design through the use of such software and hardware tools as: CAD / CAM, Exocad and Ansys.
 This article presents a study of the stress-strain state (SSS) of the roots of teeth, stump pins and jaws. Various variants of suprastructure designs and various materials of stump pins are considered. A comparative analysis of SSS for various materials of pins and crowns was carried out.
 AIMS: Optimization of the design of crowns and post structures to reduce the load on the remaining roots of the teeth and the surrounding bone structures of the crest of the alveolar processMATERIALS AND METHODS: A comparative analysis of the stress-strain state (SSS) of the jaw (JJ) with 3 variants of suprastructures was carried out. Option 1 - separate single suprastructures, where each is fixed to the root of the tooth. Option 2 - a suprastructure combined into a single block by groups of teeth (premolar-molar segments, from canine to canine), Option 3 - a suprastructure combined into a single block in the form of a "horseshoe".RESULTS: For each option, stress-strain states were obtained for various options for the material of the stump pin inlays.CONCLUSIONS: The developed methodology and calculation program made it possible to carry out three series of calculations for three options for establishing suprastructures with step displacement along the jaw and to conduct a comparative analysis of their SSS