[Experimental research on the stresses in roots with a pin "stump" structural element and in the periodontium of the masticatory teeth using a photoelasticity method].

The photoelasticity method, that discloses the physical essence and the mechanism of the emergence of stress fields in the periodontium, was used to study the strained status of the pin 'stump' design-root-periodontium-well system in flat models with a conditioned root shape 6 perpendicular to 6; various methods of cavity preparation were used, and occlusion was exposed to different combined and solitary vertical forces. Analysis of the findings helps define the optimal methods for cavity preparation and the geometry of the pin 'stump' design from the strained deformed status of certain sites. The authors have for the first time developed a method for simulation of contact strain fields and revealed a relationship that can be calculated from simulated designs to natural ones.