臼齒部 陶材前裝鑄造冠 邊緣形態에 따른 應力分析 = Stress Analysis of Posterior Porcelain-Fused-to-Metal Crown by Marginal Configurations

다국어 초록 (Multilingual Abstract)

To study the mechanical behaviors of the margins of porcelain-fused-to-metal crown on the posterior teeth, 5 types of margins on the lower first molar were chosen, and then the finite element models were constructed. 50㎏ forces were applied to the porcelain on the axial wall supported by the metal vertically.
The displacements and stresses of the porcelain-fused-to-metal crown were analyzed to investigate the influence of the type of margins.
The results were as follows ;
1. High tensile stresses were exhibited on the porcelain of the portion of the coronal line angle insufficient meatllic support.
2. It case metal coping had a good supporting form to vertical force, uniform compressive stresses were exhibited on their supporting form.
3. Tensile stresses in the infrrmetallic margin on the series of the shoulder with a bevel margins were decreased in the bevel portion.
4. Principal stresses on the metal of the chamfer marginal portion were decreased comparing with the series of the shoulder margins.
5. The noticeable compressive stress gradients were exhibited between axial cement layer and metal on the series of the shoulder margins.
6. The principal stresses on the marginal cement layer were higher than that of the occlusal and axial wall.