Objective:To investigate the application of two post-core materials in the repair of residual roots and crowns of teeth and analyze the influence on marginal fit and masticatory function.Methods:Clinical data of patients with residual roots and crowns of teeth were included.According to different treatment regimens,they were divided into fiber group(glass fiber post core repair)and metal group(cast metal post core repair),with 59 cases in each group.All patients were followed up for 2 years after repair.The repair effect,marginal fit(USPHS restoration grading),masticatory function(bite force,chewing effi-ciency),periodontal health[gingival index(GI)score,plaque index(PLI)score,and periodontal pocket depth(PD)],quality of life(OHIP-14 score)and the occurrence of adverse events were compared between the two groups.Results:After 2 years of re-pair,the excellent and good rate,USPHS restoration grading,occlusal force and masticatory efficiency in fiber group were high-er than those in metal group(P＜0.05).The GI score,PLI score,PD and scores of dimensions of pain discomfort,functional limitation and ability limitation of OHIP-14,and the total adverse events rate were lower in fiber group than those in metal group(P＜0.05).Conclusion:Compared with cast metal post core,glass fiber post core has better repair effect and marginal fit in the repair of residual roots and crowns of teeth,and the latter one can effectively improve the masticatory function,periodon-tal health and quality of life,and has higher safety.