Fiber posts are widely used because of its good mechanical property and biocompatibility.Clinically,the fracture strength of fiber post plays an important role in the retention of fiber post,so scholars have made a large number of experiments in vitro to study the fracture strength of fiber posts. In order to provide certain clinical evidence for fiber post-and-core repair,this review article aims to introduce and summarize the recent progress in the factors,such as the length of fiber posts,different post-and-core systems,the surface treatment and so on,which influence the fracture strength of the fiber posts. Fiber post-and-core system can enhance the fracture strength of teeth in vitro and the fracture modes are repairable,which is benefit for the retention of the root and meets the needs of clinical treatment.

目的:通过调查该院牙周病患者的疾病构成及其变化趋势,从而满足牙周病患者需求,并为口腔健康和牙周病防治提供临床依据.方法:收集2009～2013年哈尔滨医科大学附属第二临床医学院牙周黏膜科的牙周病患者资料,并按1999年国际牙周病分类诊断,采用Excel、SPSS软件进行数据整理分析.结果:主要诊断为牙周病的患者共8058人次,按1999年国际牙周病分类诊断共7874人次,占97.72％.共24种疾病,其中所占比例较高者(构成比≥3.00％)依次为:慢性牙周炎(35.62％)、慢性龈炎(14.94％)、反应全身疾病的牙周炎(6.73％)、扁平苔藓(累及牙龈)(5.47％)、伴牙髓病变的牙周炎(4.71％)、牙周脓肿(4.43％)、侵袭性牙周炎(3.67％)、牙龈瘤(3.56％)、青春期龈炎(3.00％).复诊1557人次,不同就诊原因致使其接受治疗和复诊情况具有显著差异.结论:本次调查在一定程度上反应出哈尔滨市综合医院牙周病患者的疾病构成及患者对该疾病的认知程度,且患者就诊原因与其治疗和复诊情况具有相关性.