Mechanical Properties of Quartz Fiber Post

Lee, Young Soo; Kang, Ik Je

Abstract

The post core system has been used for reconstructon of severely damaged crown by caries or trauma.But problems such as crown exfoliation,post core fracture and root fracture have been reported. Ideal mechanical properties of the post require high fracture strength,high elastic limit and high resistance against fatigue and corrosion.Modulus of elasticity of the post should be similar with that of dentine.Low hardness is also required for the convenience of post removal in failure.Furthermore, the post itself must be translucent for the esthetical purpose.Several types of the post have been developed to satisfy the criteria above mentioned. The purpose of this study was to find out the mechanical properties of quartz fiber post by comparing with those of gold post and zirconia post. The results of this study were as follows : 1.Maximal fracture strength and stiffness of quartz fiber post were similar with those of gold post and zirconia post. 2.Young's modulus and hardness of quartz fiber post were lower than those of gold post and zirconia post. Mechanical property of quartz fiber post against post fracture was similar with that of gold post and zirconia post.Mechanical property of quartz fiber post against root fracture was higher than that of gold post and zirconia post.Quartz fiber post could be removed easily due to low hardness.