title: Effect of Remaining Cavity Wall, Cervical Dentin, and Post on Fracture Resistance of Endodontically Treated, Composite Restored Premolars.
abstract: OBJECTIVE
  The aim of this study was to examine the effect of remaining buccal cavity wall, remaining cervical tissue, and post on the fracture strength of endodontically treated restored premolars.
  
  
  METHODS
  Teeth were randomly allocated to 10 experimental groups (n=10) according to cavity design and presence or absence of post or to a control group. After thermal and mechanical aging, ramped loading until fracture was performed.
  
  
  RESULTS
  A high cervical outline (417 N) and the presence of a post (189 N) increased fracture strength, but both factors together had an antagonistic effect of -218 N, resulting in a higher strength of not 606 N (417+189) but 388 N. The risk of catastrophic failure increased (OR=3.17) when a post was present.
authors.forename: Jovito Adiel
authors.initials: JA
authors.lastname: Skupien
authors.forename: Cees
authors.initials: C
authors.lastname: Kreulen
authors.forename: Niek
authors.initials: N
authors.lastname: Opdam
authors.forename: Ewald
authors.initials: E
authors.lastname: Bronkhorst
authors.forename: Tatiana
authors.initials: T
authors.lastname: Pereira-Cenci
authors.forename: Marie-Charlotte
authors.initials: MC
authors.lastname: Huysmans
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D003743:Dental Enamel / Q000473:pathology*; D003764:Dental Materials / Q000737:chemistry*; D003804:Dentin / Q000473:pathology*; D005898:Glass / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D013696:Temperature; D019237:Tooth Cervix / Q000473:pathology*; D014082:Tooth Fractures / Q000503:physiopathology*; D019231:Tooth Preparation, Prosthodontic / Q000379:methods*; D019553:Tooth, Nonvital / Q000628:therapy*
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; C009753:fiberglass; C533204:filtek Z350