K.-H. Kim, S.-G. Woo, K. Son, and J.-K. Park (Korea)
Finite element methods, Non-carious cervical lesion, Restorative material, Stiffness, Energy dissipation
This study investigated an effect of restoring composite resins with different elastic moduli on the stress distribution of restored non-carious cervical lesions (NCCLs). The NCCLs studied are notch-shaped and under an occlusal loading condition. Two materials of Tetric Flow and Z100 were used as representatives of flowable and hybrid resins to restore the NCCL. A static load of 500 N was applied at the buccal and palatal cusps in a point load condition. All restoration models were found to be weaker in the tensile state than in the compressive one regardless of the restorative materials. The maximum stresses after restoration were reduced to a half than before restoration, but dangerous stresses were still at the both corners of the lesion. The reduction ratio of maximum stress for Tetric Flow was by 8 % larger than that for Z 100 under both compression and tension. Therefore, tensile stress poses more of a risk for tooth fracture and Z 100 is more appropriate for restoring NCCL
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