title: The effect of alveolar bone loss on the load capability of restored endodontically treated teeth: a comparative in vitro study.
abstract: OBJECTIVE
  The aim of the present investigation was to study the influence of a reduced bone support on the fracture resistance of endodontically treated teeth restored with glass fibre-reinforced posts (FRC).
  
  
  METHODS
  30 caries-free maxillary central incisors were divided into 3 groups (n=10). Endodontic treatment was performed. Teeth were flattened 2 mm above the cemento-enamel junction. Group I (control) simulated a clinical situation without horizontal bone loss. In group II a horizontal bone loss of 25% and in group III of 50% was simulated. All specimens received FRC posts and composite core restorations. All-ceramic crowns were adhesively cemented. Specimens were exposed to thermal cycling and mechanical loading (TCML) and finally statically loaded until failure in a universal testing machine (v=1 mm/min). Non-parametric tests were used to compare median fracture loads between groups. Fracture modes were compared using Fisher's exact test.
  
  
  RESULTS
  The median fracture load values (min/max) in [N] were: group I=501 (326/561), group II=422 (323/495); group III=352 (266/406), p=0.004. Two specimens in each group II and III failed during TCML. Statistical analysis revealed statistically significant differences between all test groups regarding maximum fracture load and mode of fracture.
  
  
  CONCLUSIONS
  The fracture resistance of endodontically treated teeth restored adhesively with a FRC post, composite core, and all-ceramic crown is dependent on the level of surrounding supporting periodontal bone. Loss of alveolar bone loss due to periodontal disease may lead to an increased risk of failure.
authors.affiliation: Department of Prosthodontics and Geriatric Dentistry, Charité, Humboldt University, Augustenburger Platz 1, Berlin, Germany. michael.naumann@charite.de
authors.forename: Michael
authors.initials: M
authors.lastname: Naumann
authors.forename: Martin
authors.initials: M
authors.lastname: Rosentritt
authors.forename: Anja
authors.initials: A
authors.lastname: Preuss
authors.forename: Thomas
authors.initials: T
authors.lastname: Dietrich
mesh_terms: D016301:Alveolar Bone Loss / Q000150:complications*; D003188:Composite Resins; D019245:Compressive Strength; D003442:Crowns; D003776:Dental Porcelain; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D005898:Glass; D006801:Humans; D007180:Incisor; D011176:Post and Core Technique; D014082:Tooth Fractures / Q000209:etiology*; D019553:Tooth, Nonvital
chemical_list: D003188:Composite Resins; C009753:fiberglass; D003776:Dental Porcelain