title: Effect of placement of calcium sulphate when used for the repair of furcation perforations on the seal produced by a resin-based material.
abstract: OBJECTIVE
  To evaluate the sealing ability of calcium sulphate when used under composite resin for the repair of furcation perforations having different diameters.
  
  
  METHODS
  Perforations of different diameter were created in the floors of pulp chambers in 60 extracted human molar teeth with either a number 3 (1 mm diameter) or 5 (1.5 mm diameter) round bur. The specimens of each group were divided into four sub-groups which were repaired with composite resin either alone or in combination with calcium sulphate that created an artificial floor (15 teeth group(-1)). Eight teeth without furcation perforations served as negative controls. In the leakage detection device, 1 mol L(-1) glucose solution was forced under a pressure of 1.5 KPa from the crown towards the pulp chamber floor. The concentration of leaked glucose was measured at 1, 2, 4, 7, 10, 15 and 20 days using a glucose oxidase method and the data evaluated using the rank sum test.
  
  
  RESULTS
  The specimens with larger perforations repaired with composite resin alone had significantly more leakage (P < 0.05). Using calcium sulphate as an artificial floor significantly decreased leakage of smaller perforations (P < 0.05). In groups repaired with calcium sulphate under composite resin, leakage in smaller perforations was markedly lower than that in larger ones (P < 0.05). No significant difference was found between the specimens with 1 or 1.5 mm perforations repaired with resin alone (P > 0.05).
  
  
  CONCLUSIONS
  Calcium sulphate significantly improved the sealing ability of 1 mm perforations repaired with composite resin but not for 1.5 mm perforations.
authors.affiliation: Key Laboratory of Oral Biomedical Engineering, Ministry of Education, Sichuan University, Chengdu, China.
authors.forename: L
authors.initials: L
authors.lastname: Zou
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: S-H
authors.initials: SH
authors.lastname: Yin
authors.forename: J
authors.initials: J
authors.lastname: Tan
authors.forename: F-M
authors.initials: FM
authors.lastname: Wang
authors.forename: W
authors.initials: W
authors.lastname: Li
authors.forename: J
authors.initials: J
authors.lastname: Xue
mesh_terms: D002133:Calcium Sulfate / Q000627:therapeutic use*; D003188:Composite Resins / Q000627:therapeutic use*; D003762:Dental Instruments / Q000009:adverse effects; D003763:Dental Leakage / Q000517:prevention & control*; D003764:Dental Materials / Q000627:therapeutic use*; D003786:Dental Pulp Cavity / Q000293:injuries*; D006801:Humans; D008689:Methacrylates / Q000627:therapeutic use; D008963:Molar; D019279:Resin Cements / Q000627:therapeutic use; D018677:Tooth Injuries / Q000628:therapy*; D014092:Tooth Root / Q000293:injuries*
chemical_list: C112828:Clearfil AP-X; D003188:Composite Resins; D003764:Dental Materials; D008689:Methacrylates; D019279:Resin Cements; D002133:Calcium Sulfate