Numerical investigation of influence of defects of the dentition small extent on the stress-strain state of bridge prosthesis and periodontium

The investigation aim is numerical evaluation of polymethylmethacrylate dental bridge and periodontal ligament stres-strain state in the case of tilted premolar and molar in mandible. Plain strain formulation is used via finite element method. Effect of dental cement on results is also studied. Equivalent stresses in dental bridge and periodontal ligament are determined using von Mises and maximum principal stress criteria. Equivalent stresses in cement are determined using Mohr criterion. The study investigated no difference in stres-strain state of dental bridge with and without consideration of cement. The results showed that dental bridge implantation in the case of tilted teeth redistribute and reduce forces acting on periodontal ligament in comparison with tilted vital teeth.