Three-dimensional Finite Element Analysis on Effect of Deep Margin Elevation Materials and Heights on First Mandib-ular Molar Inlay Restoration of Subgingival Defects
Objective:To evaluate the effects of different deep margin elevation(DME)materials and lifting heights on the biomechanical behavior characteristics of inlay in mandibular first molar with subgingival defects.Methods:Three-dimensional finite element models of mandibular first molars were established based on Micro CT three-dimensional image data.Seven groups of three-dimensional finite element models of mandibular first molar in-lay restoration with different DME heights were established through computer-aided design simulation of DME and inlay restoration.The stress distribution and magnitude of each part and interface of the model under two different DME materials(flowable resin and packable resin)and seven different DME heights were studied and compared through three-dimensional finite element simulation analysis.Results:With the increase of DME height,the peak of maximum principal stress(MPS)of the inlay itself continued to rise,while the peak of MPS of the DME layer,the peak of interfacial tensile stress(ITS)between the DME layer and the inlay,and the peak of ITS between the DME layer and the tooth continued to decrease.At the same DME layer height,the peak of MPS of the DME layer,the peak of ITS between the DME layer and the inlay,and the peak of ITS between the DME layer and the tooth were all smaller than those of the packable resin group.The changes in DME layer material and height had no significant effect on other observation indicators.Conclusion:Low elastic modulus DME material and increased DME height are beneficial to reduce the stress of the model and interface.Therefore,it is recommended to choose flowable resin as DME material in clinical operation and appropriately lift the DME layer height.
deep margin elevationinlaysubgingival defectsfinite element analysisstress distribution
万方数据
维普
