title: [Investigation of influence on apical sealability generated by root canal sealer placement].
abstract: OBJECTIVE
  To investigate the influence of sealer placement on apical sealability in root canal treatment.
  
  
  METHODS
  100 extracted single root canal teeth were selected. All canals were prepared by manual Protaper instrument in a step-back way. The samples were divided into 5 groups randomly. A group: 30 samples, sealer placement by chief gutta percha; B group: 30 samples, sealer placement by K file; C group: 30 samples, sealer placement by spreader; D group: 5 samples, a positive control; E group: 5 samples, a negative control. There were 2 subsets in each experimental group which were obturated by lateral gutta percha with or without sealer. Glucose oxidase method was used to measure the apical leakage at the 1st 2nd, 4th, 7th, 10th, 15th, 20th, 25th, 30th day of the experiment.
  
  
  RESULTS
  Apical sealability varied with different sealer placement methods (F=4.832, P=0.001). Sealer placement by chief gutta percha (A group) had the best instant apical sealability. However, lateral gutta percha with or without sealer didn't affect the apical sealibility.
  
  
  CONCLUSIONS
  Placing the same kind sealer in different ways can affect the apical sealability. There were no significant differences of the apical leakage no matter the lateral gutta percha with or without sealer. In order to get better instant apical sealability and simplify the clinic operation, placing the sealer with a chief gutta percha while the lateral gutta percha without sealer is recommended.
authors.affiliation: State Key Laboratory of Oral Diseases, Sichuan University, Chengdu 610041, China.
authors.forename: Li-Wei
authors.initials: LW
authors.lastname: Zheng
authors.forename: Zhi-Qiang
authors.initials: ZQ
authors.lastname: Zhang
authors.forename: Yu-Qing
authors.initials: YQ
authors.lastname: Hao
authors.forename: Guo-Biao
authors.initials: GB
authors.lastname: Yang
authors.forename: Ling-Yun
authors.initials: LY
authors.lastname: Xia
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
authors.forename: Xin-Mei
authors.initials: XM
authors.lastname: Chen
mesh_terms: D003763:Dental Leakage; D003786:Dental Pulp Cavity; D006171:Gutta-Percha; D006801:Humans; D012389:Root Canal Obturation; D018915:Root Canal Preparation; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D015035:Zinc Oxide-Eugenol Cement; C112894:canals sealer; D006171:Gutta-Percha