To investigate the flexility of the post core and the root after restoration
Objective Compare the bending resistance of three materials—cobalt-chromium alloy,Polyether ether ketone,and fiber post-both in their pure form and as post-core materials for the restoration of the roots of mandibular single premolars.The objective of this study is to investigate whether the flexural resistance of the post-core material made of polyether ether ketone meets clinical requirements for dental restoration.Methods Three sets of piles made of different materials were embedded in the resin blocks,with eight piles in each set.The maximum load values of these piles were then measured using a universal mechanical testing machine and recorded.Forty-nine mandibular premolar teeth with single roots were randomly assigned to seven groups based on the material used and the height of the dentine shoulder collar(1 mm;1.5 mm).After the post-core-crown restoration and embedding,the maximum load value was measured on the universal material testing machine,and then the failure mode was observed.Results During the comparison of the bending resistance of pure materials,it was observed that the maximum load value of the polyether ether ketone group fell between the other two groups,and a statistically significant difference was found when compared to the other two groups(P＜0.05).After using three materials as post-core materials to restore the mandibular single premolar,in the comparison of the resistance to fracture of each group of teeth roots,the maximum load value of the polyether ether ketone group and the fiber post group were statistically different from each other(P＜0.05),and there was no statistical difference between the maximum load value of the polyether ether ketone group and that of cobalt-chromium alloy group(P＞0.05).The majority of damage in the polyether ether ketone group is repairable.Conclusion The flexural resistance of the polyether ether ketone post core is sufficient for clinical requirements,and the likelihood of irreparable root fractures after restoration with a polyether ether ketone post core is relatively low.
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