title: An experimental pathologic study of gingivectomy using dual-wavelength laser equipment with OPO.
abstract: OBJECTIVE
  This study was conducted to evaluate how soft tissues respond to treatment by a tunable laser with an optical parametric oscillating (OPO) mechanism capable of simultaneously emitting two wavelengths.
  
  
  METHODS
  Marginal gingiva of dogs was incised by a prototype laser oscillator. The oscillator was set at two wavelengths known to effectively incise tissue and arrest hemorrhage with minimal invasiveness. Four laser irradiation conditions were set based on different combinations of the 1.67 and 2.94 microm wavelengths. The animals were sacrificed immediately after surgery, 7 days after surgery, and 28 days after surgery for histological examination.
  
  
  RESULTS
  When irradiation at 1.67 and 2.94 microm wavelengths was simultaneously applied, the former conferred an observable hemostatic effect and the latter incised the tissue. Wound healing was similar to that in conventional methods and no serious inflammation was observed.
  
  
  CONCLUSIONS
  Simultaneous irradiation at wavelengths of 1.67 and 2.94 microm can be an effective method in soft tissue surgery.
authors.affiliation: Department of Operative Dentistry, Tokyo Dental College, Chiba, Japan. amagai@tdc.ac.jp
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Amagai
authors.forename: Junji
authors.initials: J
authors.lastname: Kato
authors.forename: Chikahiro
authors.initials: C
authors.lastname: Haruyama
authors.forename: Keigo
authors.initials: K
authors.lastname: Ohsuka
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Takase
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Hirai
mesh_terms: D000818:Animals; D004285:Dogs; D005881:Gingiva / Q000473:pathology / Q000601:surgery*; D005890:Gingivectomy / Q000295:instrumentation*; D006487:Hemostasis; D017075:Laser Coagulation / Q000295:instrumentation*; D010865:Pilot Projects