The effects of C02, Nd: YAG and Er: YAG lasers with and without surface coolant on tooth root surfaces
- 1 September 1997
- journal article
- clinical trial
- Published by Wiley in Journal of Clinical Periodontology
- Vol. 24 (9) , 595-602
- https://doi.org/10.1111/j.1600-051x.1997.tb00235.x
Abstract
The objective of this study was to compare and contrast the morphologic changes in tooth root surfaces treated in vitro by scaling and root planing followed by irradiation with the Er:YAG laser using air/water surface cooling and the CO2 and Nd:YAG lasers, both with and without surface coolant. The experimental unit consisted of 42 freshly extracted teeth which were divided equally and randomly assigned to the following 7 treatment groups: untreated control, S/RP only, CO2 laser with and without air/water surface cooling, Nd:YAG laser with and without/air water surface cooling, and Er:YAG laser with air/water surface coolant. Specimens treated with CO2 laser irradiation were subjected to energy densities ranging from 100 to 400 J/cm2; those treated with the Nd:YAG from 286 to 1857 J/cm2; and the Er:YAG was used within a range of 20 to 120 J/cm2. The degree of morphologic change following CO2 and Nd:YAG irradiation appeared directly related to energy density but unrelated to the use of surface coolant. Laser induced surface changes included cavitation, globules of melted and resolidified mineral, surface crazing, and production of a superficial char layer. In contrast, the Er:YAG laser produced root surface changes that might be expected from acid etching, i.e., removal of the smear layer and exposure of the collagen matrix. In addition, sharply defined microfractures of the mineralized structure were noted and unlike the CO2 and Nd:YAG lasers, there was no evidence of melting or surface char. Given the parameters of this study, it appears that both the CO2 and Nd:YAG lasers alter the root surface in an undesirable manner. The Er:YAG laser, however, when used at low energy densities shows sufficient potential for root surface modification to warrant further investigation.Keywords
This publication has 43 references indexed in Scilit:
- Morphologic changes following in vitro CO2 laser treatment of calculus-ladened root surfacesLasers in Surgery and Medicine, 1996
- Preliminary in vitro investigation of the effects of pulsed Nd:YAG laser radiation on enamel and dentineBiomaterials, 1994
- Erbium:YAG (2.94 μm) Laser Effects on Dental TissuesJournal of Laser Applications, 1990
- The Effectiveness of Subgingival Scaling and Root Planing I. Clinical Detection of Residual CalculusThe Journal of Periodontology, 1990
- Ultrastructural Observations on Bacterial Invasion in Cementum and Radicular Dentin of Periodontally Diseased Human TeethThe Journal of Periodontology, 1988
- Repair of periodontal furcation defects in beagle dogs following reconstructive surgery including root surface demineralization with tetracycline hydrochloride and topical fibronectin applicationJournal of Clinical Periodontology, 1988
- Effects of Laser Irradiation on DentinDental Materials Journal, 1987
- Scaling and root planing with and without periodontal flap surgeryJournal of Clinical Periodontology, 1986
- The Effect of Root Planing and Citric Acid Applications on Flap Healing in Humans: A Histologic EvaluationThe Journal of Periodontology, 1984
- The Comparative Effectiveness of Various Agents in Detoxifying Diseased Root SurfacesThe Journal of Periodontology, 1983