Affects Of Different Post Luting Cements On Dentinal Stress

The usage of post-core cemented in root canal is a conventional method to restore the decayed teeth. In order to have effective retention, we must use cements which can lute the post and form post-core system between root canal and post. We have four kinds of different cements, which are zinc phosphate cement(ZOP), glass ionomer cement(GIC), resin cement(RC), resin-modified glass ionomer cement(RMGIC) and have different elastic modulus .Objective: This study aimed at analyzing the effects of the different luting cements on the peak of the dentinal stress and dentinal stress distribution in order to evaluate their roles in fracture resistance of endodontically treated teeth.Materials and methods: In order to know how post luting cements influenced dentinal stress distribution and the peak of the dentinal stress, a standard human maxillary central incisor was chosen. The standard three-dimension finiteelement models of maxillary central incisor restored with porcelain fused to metal crown and pure SDA-â…¡post which cemented by 4 different luting cements were constructed by AutoCAD. Then the finite element method(3-D FEM) was used to analyze the effects of four different luting cements which have different modulus of elasticity on the stress distribution of the dentin and the peak of dentinal stress. Two forces were used.Results: All these cements could lower the the peak of the dentinal stress, the first one was zinc phosphate cement(ZOP).The descendent rate of it was 46.3%.A11 the cements have not evident effects on the dentinal stress distribution.Conclusion: Within the limitations of this study, the zinc phosophate cements showed better condition than the other cements in the dentinal stress distribution.