Pulsed laser beam effects on gingiva.

The effects of CO2 lasers on human gingiva have been evaluated. Pulsed Nd:YAG lasers have only been available for clinical use in dentistry since 1990. This study evaluated the efficacy of a low-power pulsed laser in removing pocket lining epithelium in humans with moderate periodontitis. 24 specimens of gingival tissue, from 6 patients, were studied microscopically following the application of a pulsed Nd:YAG laser (1064 nm) contact probe with a spotsize of 320 mu. Power settings of 1.25 and 1.75 Watts and a frequency of 20 Hz were used. Treatment time varied from 2 to 3 min. The specimens were fixed and processed in the usual manner. Four representative sections for each tooth were examined with the light microscope at 25 and 100 x magnification. Most sections (83%) exhibited complete removal of epithelium except for traces of viable basal cell remnants at the coronal sulcular margin (17%). The underlying connective tissue demonstrated no evidence of necrosis or carbonization. Morphologic features showed minimal change other than removal of pocket lining epithelium, compared to control sites. The pulsed Nd-YAG laser can remove pocket lining epithelium in moderately deep pockets at 1.25-1.75 W of power.

[1]  T. Karring,et al.  New attachment following surgical treatment of human periodontal disease. , 1982, Journal of clinical periodontology.

[2]  L GOLDMAN,et al.  EFFECT OF LASER BEAM IMPACTS ON TEETH. , 1965, Journal of the American Dental Association.

[3]  M A Pogrel,et al.  Histologic evaluation of the width of soft tissue necrosis adjacent to carbon dioxide laser incisions. , 1990, Oral surgery, oral medicine, and oral pathology.

[4]  H. Goldman.  Histologic assay of healing following ultrasonic curettage versus hand-instrument curettage. , 1961, Oral surgery, oral medicine, and oral pathology.

[5]  M. L. Morris.  The Removal of Pocket and Attachment Epithelium in Humans: A Histological Study , 1954 .

[6]  H. Tal,et al.  Elimination of epithelium from healing postsurgical periodontal wounds by ultra-low temperature. Initial observations. , 1985, Journal of periodontology.

[7]  J. Caton,et al.  The attachment between tooth and gingival tissues after periodic root planing and soft tissue curettage. , 1979, Journal of periodontology.

[8]  R. Yukna,et al.  A clinical study of healing in humans following the excisional new attachment procedure. , 1976, Journal of periodontology.

[9]  Nd:YAG Laser Therapy in Dental and Oral Surgery , 1988 .

[10]  J. Adrian.  Pulp effects of neodymium laser. A preliminary report. , 1977, Oral surgery, oral medicine, and oral pathology.

[11]  J. Adrian,et al.  Laser and the dental pulp. , 1971, Journal of the American Dental Association.

[12]  M. Minabe,et al.  A critical review of the biologic rationale for guided tissue regeneration. , 1991, Journal of periodontology.

[13]  H. Löe,et al.  New periodontal attachment procedure based on retardation of epithelial migration. , 1974, Journal of clinical periodontology.

[14]  R. H. Stern.  Laser beam effect on dental hard tissues , 1964 .

[15]  B. Moskow.  The Response of the Gingival Sulcus to Instrumentation: A Histological Investigation.* 2. Gingival Curettage , 1964 .

[16]  S. Nyman,et al.  Periodontal regeneration via selective cell repopulation. , 1987, Journal of periodontology.

[17]  W S Grundfest,et al.  Excimer laser ablation of fibrocartilage: An in vitro and in vivo study , 1991, Lasers in surgery and medicine.

[18]  F C Holstege,et al.  Temperature along the surface of modified fiber tips for Nd:YAG laser angioplasty , 1991, Lasers in surgery and medicine.

[19]  R M Pick,et al.  The laser gingivectomy. The use of the CO2 laser for the removal of phenytoin hyperplasia. , 1985, Journal of periodontology.

[20]  F. Cabello,et al.  Bactericidal effects of the neodymium: YAG laser: In vitro study , 1986, Lasers in surgery and medicine.

[21]  R. Yukna,et al.  Five year evaluation of the excisional new attachment procedure. , 1980, Journal of periodontology.