title: Use of a hydroxylapatite-based material and calcium sulfate as artificial floors to repair furcal perforations.
abstract: OBJECTIVE
  The purpose of this study was to evaluate a hydroxylapatite-based material and calcium sulfate when each was used under a resin-modified glass ionomer cement to repair furcation perforations.
  
  
  METHODS
  Perforations of pulp chamber floors were made in 72 teeth of 9 dogs. Perforations were divided into 3 equal-sized groups and repaired with resin-modified glass ionomer either alone or over an artificial floor. The artificial floor was either a hydroxylapatite-based material or calcium sulfate. Three dogs were killed at each of 3 intervals (1, 3, and 6 months). The tissue response to the tested materials was evaluated clinically, radiographically, and histologically.
  
  
  RESULTS
  The hydroxylapatite-based material showed the highest radiographic success; this was followed by calcium sulfate and glass ionomer. From histologic evaluation, the average success rate was found to be 67% for calcium sulfate, 62% for the hydroxylapatite-based material, and 59% for glass ionomer. However, there was no statistical significant difference with the resin-modified glass ionomer when it was used alone and when it was used over a barrier. There was also no significant difference between the hydroxylapatite-based material and the calcium sulfate when they were used as artificial floors.
  
  
  CONCLUSIONS
  The use of an artificial floor may not be necessary when flowable resin-modified glass ionomer cements are used.
authors.affiliation: Department of Restorative Dentistry, College of Dentistry, University of Tanta, Egypt.
authors.forename: H A
authors.initials: HA
authors.lastname: Alhadainy
authors.forename: V T
authors.initials: VT
authors.lastname: Himel
authors.forename: W B
authors.initials: WB
authors.lastname: Lee
authors.forename: Y M
authors.initials: YM
authors.lastname: Elbaghdady
mesh_terms: D000818:Animals; D002133:Calcium Sulfate / Q000494:pharmacology*; D003188:Composite Resins; D003762:Dental Instruments / Q000009:adverse effects; D003786:Dental Pulp Cavity / Q000293:injuries*; D003793:Dental Restoration, Permanent / Q000379:methods*; D004285:Dogs; D017886:Durapatite / Q000494:pharmacology; D005260:Female; D005899:Glass Ionomer Cements / Q000737:chemistry / Q000494:pharmacology; D006882:Hydroxyapatites / Q000494:pharmacology*; D010012:Osteogenesis / Q000187:drug effects; D010486:Periapical Tissue / Q000187:drug effects*; D010513:Periodontal Ligament / Q000187:drug effects; D018915:Root Canal Preparation / Q000009:adverse effects* / Q000295:instrumentation; D018677:Tooth Injuries / Q000628:therapy*; D014092:Tooth Root / Q000293:injuries
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements; C117341:Hapset; D006882:Hydroxyapatites; D017886:Durapatite; D002133:Calcium Sulfate