title: [Effect of post-post space adaption on the fracture resistance of immature permanent teeth].
abstract: OBJECTIVE
  To investigate the influences of post-post space adaption to the fracture resistance of the immature teeth restored with 3 different diameter fiber posts.
  
  
  METHODS
  Seventy-five untreated maxillary and mandibular premolars were selected, and randomly assigned to 5 groups, including 3 experimental groups (1.3mm,1.6mm,1.9mm fiber post + composite resin cement), 1 positive control(composite resin cement), and 1 negative control. After RCT applied for each tooth, the post space was prepared to standard size and restored according to the protocol. The samples were embedded, and the fracture resistance at cervical 1/3 and middle 1/3 of the root was measured. The data was analyzed with SAS6.0 software package.
  
  
  RESULTS
  In samples restored with 1.3mm,1.6mm,1.9mm fiber post + composite resin cement, the average fracture resistances at cervical 1/3 were (811±33.85)N, (901±39.85)N and (999±75.40)N, respectively, and (681±26.64)N,(729±28.77)N and (799±21.77)N at middle 1/3,respectively. The difference of the average fracture resistance at cervical 1/3 and middle 1/3 was significant among the 5 groups.
  
  
  CONCLUSIONS
  The adaption of post-post space influences the fracture resistance of immature teeth restored with fiber posts-suggesting post to postspace be matched as much as possible to reinforce the root.
authors: Department of Oral Anatomy, Shanghai Jiao Tong University School of Medicine, Shanghai, China. jinghuang7@126.com
authors: Jing
authors: J
authors: Huang
authors: Jun
authors: J
authors: Wang
mesh_terms: D001641:Bicuspid; D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements; D011176:Post and Core Technique; D011897:Random Allocation; D019279:Resin Cements; D014082:Tooth Fractures; D014092:Tooth Root
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; D005899:Glass Ionomer Cements; D019279:Resin Cements