title: Load-bearing capacity of human incisor restored with various fiber-reinforced composite posts.
abstract: OBJECTIVE
  The aim of this study was to evaluate the load-bearing capacity and microstrain of incisors restored with posts of various kinds. Both prefabricated titanium posts and different fiber-reinforced composite posts were tested.
  
  
  METHODS
  The crowns of human incisors were cut and post preparation was carried out. The roots were divided into groups: (1) prefabricated serrated titanium posts, (2) prefabricated carbon fiber-reinforced composite posts, (3) individually formed glass fiber-reinforced composite posts with the canal full of fibers, and (4) individually formed "split" glass fiber-reinforced composite posts. The posts were cemented and composite crowns were made. Intact human incisors were used as reference. All roots were embedded in acrylic resin cylinders and stored at room temperature in water. Static load was applied under a loading angle of 45° using a universal testing machine. On half of the specimens microstrain was measured with strain gages and an acoustic emission analysis was carried out. Failure mode assessment was also made.
  
  
  RESULTS
  The group with titanium posts showed highest number of unfavorable failures compared to the groups with fiber-reinforced composite posts.
  
  
  CONCLUSIONS
  With fiber-reinforced composite posts the failures may more often be favorable compared to titanium posts, which clinically means repairable failures.
authors: Department of Prosthetic Dentistry and Biomaterials Research Institute of Dentistry, University of Turku, Lemminkäisenkatu 2, Turku, Finland. ami.lebell@utu.fi
authors: Anna-Maria
authors: AM
authors: Le Bell-Rönnlöf
authors: Lippo V J
authors: LV
authors: Lassila
authors: Ilkka
authors: I
authors: Kangasniemi
authors: Pekka K
authors: PK
authors: Vallittu
mesh_terms: D001696:Biomechanical Phenomena; D002244:Carbon / Q000737:chemistry; D000077482:Carbon Fiber; D002484:Cementation; D003188:Composite Resins / Q000737:chemistry*; D003442:Crowns; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis / Q000295:instrumentation; D055119:Elastic Modulus; D005898:Glass / Q000737:chemistry; D006801:Humans; D007180:Incisor / Q000502:physiology*; D055115:Light-Curing of Dental Adhesives; D033401:Microscopy, Acoustic; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D013314:Stress, Mechanical; D013696:Temperature; D014025:Titanium / Q000737:chemistry; D014867:Water / Q000737:chemistry; D016474:Weight-Bearing / Q000502:physiology
chemical_list: D000077482:Carbon Fiber; D003188:Composite Resins; D003764:Dental Materials; C485628:Stick resin; C500741:Unifil Core; C496140:everStick; C009753:fiberglass; D014867:Water; D002244:Carbon; D019904:Polymethyl Methacrylate; D014025:Titanium