title: An in vitro investigation of the temperature rises produced in dentine by Nd:YAG laser light with and without water cooling.
abstract: Infrared lasers are reported to have thermal side effects which may damage pulp tissue. This study investigated the thermal effects of the pulsed Nd:YAG laser. Prepared, extracted teeth were measured prior to irradiation. Temperature was recorded using a thermocouple/data logging system. Laser irradiation was carried out with or without water spray for an exposure time of ten seconds. Results indicated that dry irradiation produced unacceptable temperature rises with dentine thicknesses used. Wet irradiation produced a significantly lower temperature rise. It was concluded that the Nd:YAG laser produced thermal effects which could potentially cause pulpal trauma. A water coolant was effective in reducing these thermal effects, but the temperature rise achieved whilst using water coolant may still cause pulpal damage.
authors.affiliation: Department of Conservative Dentistry, Eastman Dental Hospital and Institute, London, UK. A.Gow@eastman.ucl.ac.uk
authors.forename: A M
authors.initials: AM
authors.lastname: Gow
authors.forename: A V
authors.initials: AV
authors.lastname: McDonald
authors.forename: G J
authors.initials: GJ
authors.lastname: Pearson
authors.forename: D J
authors.initials: DJ
authors.lastname: Setchell
mesh_terms: D003737:Dental Cavity Preparation / Q000295:instrumentation* / Q000379:methods; D003782:Dental Pulp / Q000293:injuries; D003804:Dentin / Q000293:injuries*; D006358:Hot Temperature / Q000009:adverse effects; D006801:Humans; D007834:Lasers / Q000009:adverse effects*; D009354:Neodymium; D014867:Water
chemical_list: D014867:Water; D009354:Neodymium