Effect of different inlay marginal designs and materials on the biological stress of restoration after deep margin elevation
Objective To investigate the influence of different inlay marginal designs and materials on the biomechanical properties of a dental model after deep margin elevation(DME).Methods A finite element simulation method was used to establish a dental model of a first molar with DME and cemented inlay restoration.Different inlay marginal designs and materials were simulated under biting force.The stress distribution of each part and interface of the model was analyzed,and the influence of different design parameters on the stress of the model and interface was compared.Results The design of the marginal shoulder can reduce the maximum principal stress(MPS)peak value of the enamel,dentin,inlay,and DME layers,and also reduce the interface tensile stress(ITS)peak value of the interfaces between the inlay and tooth,inlay and DME,and DME and tooth,thus reducing the risk for the fracture and detachment of each part of the model.The change in restoration material had little effect on the MPS peak value,but as the elastic modulus of the inlay increased,the ITS peak value of the interfaces between the inlay and tooth,inlay and DME,and DME and tooth was increased.Conclusion The reasonable design of the marginal shoulder and the selection of low-elastic-modulus resin inlay can reduce the risk for the detachment of the restoration material.
Deep margin elevationInlaySubgingival defectsFinite element analysisStress distribution
NETL
NSTL
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