title: Bacterial leakage in root canals obturated by different techniques. Part 1: microbiologic evaluation.
abstract: OBJECTIVE
  This study compared the coronal bacterial leakage of root canals obturated by different techniques and with different lengths of obturation.
  
  
  METHODS
  The canals of palatal roots of 160 maxillary molars were instrumented and divided into different groups according to the obturation technique used (lateral condensation, Microseal system, Touch 'n Heat + Ultrafil system, or Tagger's hybrid technique) and the length of obturation (5 mm or 10 mm). The roots were impermeabilized, sterilized in ethylene oxide, and mounted on a device for evaluation of the bacterial leakage.
  
  
  RESULTS
  Tagger's hybrid technique produced a statistically greater number of specimens with coronal leakage than the other techniques. There was no statistically significant difference between the lateral condensation, Touch 'n Heat + Ultrafil, and Microseal groups. Root canals with 10 mm of obturation produced a statistically significantly smaller number of specimens with leakage than root canals with 5 mm of obturation.
  
  
  CONCLUSIONS
  Tagger's hybrid technique produced a greater number of specimens with coronal leakage than the other techniques, and a greater number of root canals with 5 mm of obturation leaked than root canals with 10 mm of obturation.
authors.affiliation: Department of Endodontics, Bauru Dental School, University of São Paulo, Bauru, Brazil. vivianebrosco@yahoo.com.br
authors.forename: Viviane Haiub
authors.initials: VH
authors.lastname: Brosco
authors.forename: Norberti
authors.initials: N
authors.lastname: Bernardineli
authors.forename: Sérgio Aparecido
authors.initials: SA
authors.lastname: Torres
authors.forename: Alberto
authors.initials: A
authors.lastname: Consolaro
authors.forename: Clóvis Monteiro
authors.initials: CM
authors.lastname: Bramante
authors.forename: Ivaldo Gomes
authors.initials: IG
authors.lastname: de Moraes
authors.forename: Roberto Brandão
authors.initials: RB
authors.lastname: Garcia
mesh_terms: D016001:Confidence Intervals; D003763:Dental Leakage / Q000000981:diagnostic imaging / Q000382:microbiology*; D003786:Dental Pulp Cavity / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000382:microbiology*; D013293:Enterococcus faecalis / Q000302:isolation & purification; D006171:Gutta-Percha / Q000627:therapeutic use; D006358:Hot Temperature; D006801:Humans; D016014:Linear Models; D008437:Maxilla / Q000000981:diagnostic imaging; D011859:Radiography; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012389:Root Canal Obturation / Q000295:instrumentation / Q000379:methods*; D013997:Time Factors; D019553:Tooth, Nonvital / Q000000981:diagnostic imaging / Q000382:microbiology*
chemical_list: D012387:Root Canal Filling Materials; D006171:Gutta-Percha