title: Temperature changes on the root surfaces of mandibular incisors after an 810-nm high-intensity intracanal diode laser irradiation.
abstract: Temperature changes caused by laser irradiation can promote damage to the surrounding dental tissues. In this study, we evaluated the temperature changes of recently extracted human mandibular incisors during intracanal irradiation with an 810-nm diode laser at different settings. Fifty mandibular incisors were enlarged up to an apical size of ISO No. 40 file. After the final rinse with 17% ethylenediaminetetraacetic acid, 0.2% lauryl sodium sulfate biologic detergent, and sterile water, samples were irradiated with circular movements from apex to crown through five different settings of output power (1.5, 2.0, 2.5, 3.0, and 3.5 W) in continuous mode. The temperature changes were measured on both sides of the apical and middle root thirds using two thermopar devices. A temperature increase of 7 °C was considered acceptable as a safe threshold when applying the diode laser.
  
  
  RESULTS
  The results showed that only 3.5-W output power increased the outer surface temperature above the critical value.
  
  
  CONCLUSIONS
  The recommended output power can be stipulated as equal to or less than 3 W to avoid overheating during diode laser irradiation on thin dentin walls.
authors.affiliation: Universidade Paulista, Department of Endodontics, São Paulo, SP 04043-200, Brazil.
authors.forename: Andrea
authors.initials: A
authors.lastname: da Fonseca Alvarez
authors.forename: Cacio
authors.initials: C
authors.lastname: Moura-Netto
authors.forename: Alexandre
authors.initials: A
authors.lastname: Daliberto Frugoli
authors.forename: Casemiro
authors.initials: C
authors.lastname: Fernando
authors.forename: Ana Cecilia Correa
authors.initials: AC
authors.lastname: Aranha
authors.forename: Harry
authors.initials: H
authors.lastname: Davidowicz
mesh_terms: D000704:Analysis of Variance; D004708:Endodontics; D006358:Hot Temperature; D006801:Humans; D007180:Incisor / Q000528:radiation effects*; D054023:Lasers, Semiconductor; D008334:Mandible; D014092:Tooth Root / Q000528:radiation effects*