Department of Dental Materials, School of Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227 São Paulo, SP 05508-000, Brazil.
J Dent Res. 2010 Jun;89(6):587-91. doi: 10.1177/0022034510363382. Epub 2010 Mar 26.
The clinical success of fiber posts has been attributed to their lower elastic modulus. The tested hypothesis was that fiber posts could lead to lower risk of post debonding and lower risk of root fracture, despite an increase in root stresses. Stress analyses were carried out with a 3D finite element model of a premolar restored with a metallic or a fiber post. Bonded and non-bonded post/cement interface conditions were simulated. We calculated risk-of-fracture indices by determining the highest principal stress values divided by the tensile strength. Shear stresses along the post/cement interface were analyzed for the bonded models. Compared with the premolar restored with a metallic post, the fiber post generated lower stresses along the interface and higher stresses in the root. However, with the fiber post, fracture was less likely to occur in the root, since its core and post fracture indices were higher.
纤维桩的临床成功归因于其较低的弹性模量。本研究假设纤维桩可降低桩核脱落风险和根折风险，尽管其会增加根内的应力。本研究通过三维有限元模型分析了用金属桩或纤维桩修复的前磨牙，模拟了粘结和非粘结的桩/粘结剂界面条件。通过确定最高主应力值除以拉伸强度来计算骨折风险指数。分析了粘结模型中沿桩/粘结剂界面的剪切应力。与用金属桩修复的前磨牙相比，纤维桩在界面处产生的应力较低，而在根内产生的应力较高。然而，由于纤维桩的核心和桩核断裂指数较高，因此发生根折的可能性更小。
