title: [A quantitative glucose method by constant air pressure for evaluating the sealing ability of four root canal sealers].
abstract: OBJECTIVE
  To introduce a modified model for quantitative testing of glucose microleakage by constant air pressure and evaluate the sealing ability of four root canal sealers including AU Plus, Roeko Seal, Cortisomol and RC Sealer.
  
  
  METHODS
  Fifty-six straight maxillary anterior teetb were randomly divided into four experimental groups with 12 samples in each group, group A: AH Plus, group B: Roeko Seal, group C: Cortisomol, group D: RC Sealer, and positive and negative control group with 4 samples in each. After regular root preparation, samples in experimental groups were obturated by cold gutta-percha lateral compaction technique with sealers according to group description. Control groups were obturated with cold gutta-percha only. Through the model above, the value of glucose microleakage from crown to root was measured at 1, 3, 5, 7, 10, 15, 20, 25, 30 days with the glucose oxidase-peroxidase method (GOD-POD).
  
  
  RESULTS
  At day 1, 3, 5, no significant difference of microleakage was found between group A and B (P > 0.05). The same result was also seen between group C and D. From 7 days, microleakage value in each experimental group gradually increased, and statistical difference was found between groups (P < 0.05).
  
  
  CONCLUSIONS
  This new model using constant air pressure is easy to establish, sensitive and practical. Among all the sealers evaluated, polydimethylsiloxane based root canal sealer, Roeko Seal has the greatest sealing ability, while epoxy-amine resin based AH Plus is second and Zinc Oxide based Cortisomol and RC Sealer have the least sealing ability.
authors.affiliation: Dept. of Stomatology, Zhantansi Clinic, 309 Hospital of PLA, Beijing 100034, China.
authors.forename: Yunjing
authors.initials: Y
authors.lastname: Mu
authors.forename: Tiejun
authors.initials: T
authors.lastname: Qu
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Cheng
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Wang
authors.forename: Ming
authors.initials: M
authors.lastname: Zhao
authors.forename: Yuna
authors.initials: Y
authors.lastname: Wang
authors.forename: Bing
authors.initials: B
authors.lastname: Han
authors.forename: Qing
authors.initials: Q
authors.lastname: Yu
mesh_terms: D000399:Air Pressure; D003738:Dental Cements; D003763:Dental Leakage; D003786:Dental Pulp Cavity; D004853:Epoxy Resins; D005947:Glucose; D006171:Gutta-Percha; D006801:Humans; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement
chemical_list: C495565:Cortisomol; D003738:Dental Cements; D004853:Epoxy Resins; C510180:RC Sealer; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C112894:canals sealer; C465381:roeko seal; D006171:Gutta-Percha; D005947:Glucose