title: Temperature changes in gutta-percha and Resilon cones induced by a thermomechanical compaction technique.
abstract: BACKGROUND
  The aim of this study was to assess temperature changes in conventional gutta-percha, thermoplastic gutta-percha, and Resilon cones by using thermomechanical compaction technique.
  
  
  METHODS
  The root canals of extracted human teeth were placed in resin blocks and sectioned. After root canal preparation, cavities perforating the lingual wall were prepared at 4 and 8 mm from the apex, and K-type thermocouples coupled to a digital temperature meter were inserted until reaching the root canal. After placement of the main cone and accessory cones of each material assessed, a #45 thermomechanical compactor was used at 10,000 rpm. Data were analyzed by using analysis of variance and Tukey test for paired comparisons (P < .05).
  
  
  RESULTS
  A significant difference was observed between initial and maximum temperatures (mean increase, 5 degrees C-8 degrees C) with all materials (P < .05). The 3 materials showed similar temperature changes (P > .05). Changes in the apical third were higher when compared with the cervical third (P < .05).
  
  
  CONCLUSIONS
  Our results suggest that gutta-percha and Resilon present similar temperature changes during thermomechanical compaction.
authors.affiliation: Department of Restorative Dentistry, Araraquara Dental School, São Paulo State University, UNESP, Araraquara, SP.
authors.forename: Arnaldo
authors.initials: A
authors.lastname: Sant'Anna-Júnior
authors.forename: Mário
authors.initials: M
authors.lastname: Tanomaru-Filho
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Hungaro Duarte
authors.forename: José Mauricio
authors.initials: JM
authors.lastname: Santos Nunes Reis
authors.forename: Juliane Maria
authors.initials: JM
authors.lastname: Guerreiro-Tanomaru
mesh_terms: D003481:Cuspid; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D012387:Root Canal Filling Materials / Q000737:chemistry; D012389:Root Canal Obturation / Q000379:methods*; D013696:Temperature
chemical_list: D012387:Root Canal Filling Materials; C486892:resilon sealer; D006171:Gutta-Percha