Dentin strain induced by laser irradiation.
The purpose of this study was to investigate the strain and temperature change in dentin induced by laser irradiation of human root canals with or without water cooling. Twenty-eight palatal roots of extracted human maxillary first molars were used. The strain in dentin was measured using strain gauges fixed on the apical third of the buccal root surface. The temperature change of the root dentin was monitored using thermocouples embedded into dentin near the apex. The root canal was irradiated with Er:YAG or Nd:YAG laser at an output of 1 W (100 mJ, 10 pps) for 5 s. The tip of the irradiation fibre was located 2.0 mm from the root apex. With water cooling, the mean maximum strain induced by Er:YAG laser was significantly lower than that by Nd:YAG laser (P < 0.05). However, without water cooling, no significant difference between the two lasers (P > 0.05) was found. The results suggest that the strain induced by Er:YAG laser irradiation in dentin with water cooling may be minimal, but there still might be a risk of root micro-fracture if cooling is not sufficient.
Watanabe
Satoshi
S
Pulp Biology and Endodontics, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan. s.watanabe.endo@tmd.ac.jp
Saegusa
Hidetoshi
H
Anjo
Tomoo
T
Ebihara
Arata
A
Kobayashi
Chihiro
C
Suda
Hideaki
H
D001696:Biomechanical Phenomena; D002244:Carbon; D004396:Coloring Agents; D003786:Dental Pulp Cavity / Q000503:physiopathology / Q000528:radiation effects* / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000503:physiopathology / Q000528:radiation effects* / Q000648:ultrastructure; D006801:Humans; D053844:Lasers, Solid-State / Q000627:therapeutic use*; D008422:Materials Testing; D013314:Stress, Mechanical; D013696:Temperature; D013821:Thermometers; D013997:Time Factors; D019227:Tooth Apex / Q000503:physiopathology / Q000528:radiation effects; D014867:Water
D004396:Coloring Agents; C028433:chinese ink; D014867:Water; D002244:Carbon