CRACKS AND FRACTURES OF TEETH AS A CONSEQUENCE OF THE WRONG CHOICE OF THE METHOD OF TREATMENT OF DEFECTS OF HARD TISSUES OF TEETH
DOI:
https://doi.org/10.35220/2078-8916-2023-47-1.21Keywords:
defects of hard tooth tissues, restoration, complications, tooth cracks, tooth fractures.Abstract
Purpose of the study. To study and analyze the problem of the formation of cracks and fractures of teeth as a result of the wrong choice of the method of treatment of defects of hard tissues of teeth. Research methods. A number of clinical and experimental studies were conducted in accordance with the set goal and established research tasks. The clinical study was aimed at the study and analysis of complications arising after dental treatment of defects of hard tissues of teeth. The experimental study included mechano-mathematical modeling of the contact interaction of the restoration with tooth tissues. The object of the study was the stress-strain state of the "tooth-filling" or "tooth-inlay" composition, taking into account the contact interaction of the hard tissues of the tooth with the filling (inlay). The behavior of a piece-homogeneous elastic composition under the action of a hard stamp, which simulates the behavior of a restored tooth under the action of masticatory load, was investigated. Scientific novelty. On the basis of mechanicalmathematical modeling of the contact interaction of the restoration with the tooth tissues, we established that to ensure strength, the wall thickness of the damaged tooth must satisfy the condition h ≥ 0.175D. With a decrease in the thickness of the crown wall, greater annular stresses occur in the tooth tissues, the rate of growth of annular stresses increases with the increase in the Poisson ratio of the restorative material, and the faster the size of the defect. It is substantiated that large axial stresses that occur in untreated teeth with defects in the hard tissues of the tooth lead to their fractures. The built mechanomathematical model of the contact interaction of the restoration with the hard tissues of the tooth comes true in cases of greater occlusal load perceived by the restoration itself. The larger the volume of the defect, the more sensitive the restored structure is to the physical and mechanical characteristics of the restoration, the more important the choice of material is. It has been proven that the aging of the restorative material leads to an increase in the equivalent stresses in the tooth tissues, reducing the strength of the restoration. Our research allows us to state that errors at the stage of choosing a method of treatment for defects of hard tissues of the teeth lead to clinical situations with an unfavorable prognosis for such teeth up to their loss.
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