title: [Use of calcium sulfate as internal matrix to repair furcal perforations].
abstract: OBJECTIVE
  To evaluate the effect of internal matrix on sealing ability and furcal appearance of perforations repair with amalgam and resin.
  
  
  METHODS
  Perforations created in the pulpal floor of human extracted molars were repaired as follows: Amalgam, amalgam plus calcium sulfate, light-cured resin, and resin plus calcium sulfate (15 teeth/group). The furcal appearance of samples was evaluated under an operating microscope after repair. With the leakage test device, coronal 1 mol/L glucose solution was forced toward the pulpal floor. Leakage was measured by the concentration of leaked glucose in bottom reservoir at 1, 2, 4, 7, 10, 15 and 20 days with enzymatic glucose oxidase method.
  
  
  RESULTS
  No significant difference was found between group 1 and group 2 (P > 0.05). Leakage in group 4 was obviously lower than group 3 (P < 0.05) after the 7th day.
  
  
  CONCLUSIONS
  Calcium sulfate significantly improved the sealing effect of resin and provided successful barriers against its overextension.
authors.affiliation: Key. Laboratory of Oral Biomedical Engineering, Ministry of Education, Sichuan University, Chengdu 610041, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Zou
authors.forename: Shi-Hai
authors.initials: SH
authors.lastname: Yin
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Tan
authors.forename: Hao-Lai
authors.initials: HL
authors.lastname: Li
mesh_terms: D002133:Calcium Sulfate; D003763:Dental Leakage; D003782:Dental Pulp; D006801:Humans; D008963:Molar; D012387:Root Canal Filling Materials; D014092:Tooth Root
chemical_list: D012387:Root Canal Filling Materials; D002133:Calcium Sulfate