Effects of Different Materials Post-core Restoration on Fracture Resistance of Weakened Roots

VernacularTitle:不同材质桩核修复对薄弱残根抗折强度的影响
Author: Yanyan XU ; Zhi QU
Publication Type:Journal Article
Keywords: weakened root; post and core material; fracture resistance; elastic modulus; failure mode
From: Journal of China Medical University 2016;45(7):596-600
CountryChina
Language:Chinese
Abstract: Objective To investigate the influence of different kinds of post?core materials on fracture resistant ability of different walls during weakened root restoration. Methods Forty?eight human single root mandibular first premolars were randomly assigned to two groups(groupⅠwas repaired with quartz?fiber post?core and mental crown ,and groupⅡwas repaired with Co?Cr cast metal post?core and mental crown). Each main group was then divided into four subgroups of 6 specimens. All samples were tested on the universal test machine. We observed the fracture load and the fracture mode of the specimens. Results Cr?Co ally post?core group exhibited significantly higher resistance to fracture than quartz fiber post?core in the same number weakened root walls(P<0.05). With the increase in the quantity of weakened root walls ,the fracture resistance was significant decreased in the same post?core material(P<0.05). The possibility of repairable fractures in groupⅠwas significantly higher than that in groupⅡ(P<0.05). Conclusion Cr?Co alloy post?core can bear a higher bite ,but quartz fiber post?core has the most favorable fracture modes.