title: [Effectiveness of Nd:YAG laser with non-surgical periodontal therapy on improvement of periodontitis: meta analysis].
abstract: OBJECTIVE
  To compare the effects of premolars restored with 2 different types of fiber post systems, so as to provide experience for restoration of residual crown of premolars.
  
  
  METHODS
  Fifty-three residual crowns of premolar restored with fiber post systems were collected, and randomly divided into 2 groups: parallel fiber post group and double taper fiber post group. Repairing effect and operation difficulty were compared. The data was analyzed with SPSS 13.0 software package.
  
  
  RESULTS
  There was no significant difference in success rate between the 2 groups, four complications occurred in parallel fiber post group and one in double taper fiber post group.
  
  
  CONCLUSIONS
  The success rate between parallel fiber post groups and double taper fiber post group was not different, but the complication in double taper fiber post group is lower than parallel fiber post group.
authors.affiliation: School of Stomatology, China Medical University.Shenyang 110002, Liaoning Province,China. E-mail:zhaoxida@163.com.
authors.forename: Xi-da
authors.initials: XD
authors.lastname: Zhao
authors.forename: Jing-bo
authors.initials: JB
authors.lastname: Liu
authors.forename: Chong
authors.initials: C
authors.lastname: Zhang
authors.forename: Ya-ping
authors.initials: YP
authors.lastname: Pan
mesh_terms: D001641:Bicuspid; D003442:Crowns; D006801:Humans; D053844:Lasers, Solid-State; D010518:Periodontitis / Q000628:therapy*; D011176:Post and Core Technique