Treatment of periodontal pockets with a diode laser.
AN 98335718 19981020. AU Moritz-A, Schoop-U, Goharkhay-K, Schauer-P, Doertbudak-
O, Wernisch-J, Sperr-W. IN Department of Conservative Dentistry, Dental School of the
University of Vienna, Austria. TI
SO Lasers-Surg-Med 1998, VOL: 22 (5), P: 302-11, ISSN: 0196-8092. AB BACKGROUND
AND OBJECTIVE: The aim of this study is to examine the long-term effect of diode
laser therapy on periodontal pockets with regard to its bactericidal abilities and the
improvement of periodontal condition. STUDY DESIGN/MATERIALS AND
METHODS: Fifty patients were randomly subdivided into two groups (laser-group and
control-group) and microbiologic samples were collected. There have been six
appointments for 6 months following an exact treatment scheme. After evaluating
periodontal indices (bleeding on probing, Quigley-Hein) including pocket depths and
instruction of patients in oral hygiene and scaling therapy of all patients, the deepest
pockets of each quadrant of the laser-group's patients were microbiologically examined.
Afterwards, all teeth were treated with the diode laser. The control-group received the
same treatment but instead of laser therapy were rinsed with H2O2. Each appointment
also included a hygienic check-up. After 6 months the final values of the periodontal
indices and further microbiologic samples were measured. The total bacterial count as
well as specific bacteria, such as Actinobacillus actinomycetemcomitans, Prevotella
intermedia, and Porphyromonas gingivalis, were assessed semiquantitatively. RESULTS:
The bacterial reduction with diode laser therapy was significantly better than in the
control group. The index of bleeding on probing improved in 96.9% in the laser-group,
whereas only 66.7% in the control group. Pocket depths could be more reduced in the
laser group than in the control group. CONCLUSION: The diode laser reveals a
bactericidal effect and helps to reduce inflammation in the periodontal pockets in
addition to scaling. The diode laser therapy, in combination with scaling, supports
healing of the periodontal pockets through eliminating bacteria. Author.
Histometrical Evaluation of the Healing of the Dental Alveolus in Rats After
Irradiation with a Low-Powered GaAlAs Laser
Rosane F. Z. Lizarelli*; Tereza L. Lamano-Carvalho**; Luis G. Brentegani** *Physics
Institute of São Carlos, University of São Paulo, São Carlos, SP, Brazil. 13560-970 **College
of Dentistry of Ribeirao Preto, University of São Paulo, Ribeirao Preto, SP, Brazil. 14.040-
000 LIZARELLI, R. F. Z.; LAMANO-CARVALHO, T. L.; BRENTEGANI, L. G.
Histometrical evaluation of the healing of the dental alveolus in rats after irradiation with
a low-powered GaAlAs laser. in Lasers in Dentistry V, John D. B. Featherstone, Peter
Rechmann, D.D.S., Daniel Fried, Editors, Proceedingsof SPIE Vol. 3593, p. 49-56, 1999.
ABSTRACT The aim of the present work was to evaluate histometrically the effect of the
irradiation with semiconductor diode GaAlAs 790 nm low-powered laser in the
chronology of alveolar repair of rats.
Lasers of low intensity possesses an eminently analgesic, anti-inflammatory and
bioestimulant effect, producing an increase of the local micro-circulation and in the speed
of healing. Groups of five animals had their upper right incisors extracted under
anesthesia and the mucous sutured; three groups received 1.5 J/cm2 of irradiation
immediately after the extraction with laser for sweeping on the operated area. After that,
the animals were sacrificed in the periods of 7, 14 and 21 days after the dental extraction.
The material was decalcified and processed for inclusion in paraffin. Longitudinal sections
of 7 micrometers in the alveolus were made and stained with HE.
The histometric analysis was performed with the Merz grid, and 2000 points were counted
in each cervical, middle and apical thirds of the alveolus, assessing the percentage of the
bone tissue. The results shows that low-powered intensity laser produced acceleration in
osseous formation (10%) in some periods. The influence of low-powered laser on the