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A study on the change of root surface irradiated by Er:YAG laser  

Lee, Sang-Hyun (Dept. of Periodontology, College of Dentistry. Dental Science Research Institute, Chonnam National University)
Kim, Young-Jun (Dept. of Periodontology, College of Dentistry. Dental Science Research Institute, Chonnam National University)
Chung, Hyun-Ju (Dept. of Periodontology, College of Dentistry. Dental Science Research Institute, Chonnam National University)
Publication Information
Journal of Periodontal and Implant Science / v.32, no.2, 2002 , pp. 303-314 More about this Journal
Abstract
This study was performed to evaluate the usability of Er:YAG laser for periodontal therapy. Forty dental root slabs ($5{\times}5{\times}2mm^3$) were prepared from human periodontally diseased extracted teeth and grouped into 4 groups: 1) control (root planing only), 2) root planing and irradiated with laser at 30mJ, 3) root planing and irradiated with laser at 60mJ, and 4) root planing and irradiated with laser at 100mJ. The root slabs were embedded in resin block before laser treatment. Er:YAG laser was irradiated under water irrigation with the tip held perpendicular to the root surface in contact mode. After Er:YAG laser irradiation or planing on the root surface, morphological changes have been observed under SEM, and the micro-hardness and Ca/P ratio were compared. 1. In the Control group, the root surface showed the directional change caused by root planing instrumentation, and the presence of smear layer, and no exposure of dentinal tubule was observed. Laser irradiated group showed surface changes with rough dentin surface of niche and depression and dentinal tubule exposure by the elimination of smear layer. 2. The micro-hardness of root surface in the laser irradiated group was higher than the control group. The higher energy output was applied, the higher micro-hardness on root surface was resulted. 3. The higher energy output was applied, the higher Ca/P ratio was observed. The higher Ca/P ratio in 60mJ group and 100mJ group was statistically significantly compared to the control group and the 30mJ group. These results suggest that Er:YAG laser irradiation on the periodontally diseased root surface could remove smear layer and increase the micro-hardness on root surface and Ca/P ratio which contribute to enhance the acid resistance of periodontally treated root surface.
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1 Goldman L, Blanney DJ. The biomedical aspects of laser. J Am Med Assoc 1964;18:302
2 Zolotarev VM, Mikhailov BA, Alperovich LI, Popov SI. Dispersion and absorption of liquid water in the infrared and radio regions of the spectrum. Opt Spectrosc 1969;27:430-432
3 Paghdiwala AF. Does the laser work on hard dental tissue? J Am Dent Assoc 1991;12:79-80
4 Nelson JS, Yow L, Liaw LH, Berns MW. Mid-infrared Erbium:YAG laser ablation on bone : The effect of laser osteotomy on bone healing. Laser Surg Med 1989;9:362-374   DOI   ScienceOn
5 Aoki A, Ando Y, Watanabe H, Ishikawa I. Invitro studies on laser scaling of subgingival calculus with an Erbium:YAG laser. J Periodontol 1994;65:1097-1106   DOI
6 Israel M, Cobb CM, Rossman JA, Spencer P. The effect of $CO_2$, Nd:YAG and Er:YAG lasers with and without surface coolant on tooth root surface. J Clin Periodontol 1997;24:595-602   DOI   ScienceOn
7 Polson AM, Caton J. Factors influencing periodontal repair and regeneration. J Periodontol 1982;53:617-625   DOI
8 Burkes EJ, Hoke J, Gomes E, Wolbarsht M. Wet versus dry enamel ablation by Er:YAG laser. J Prosthet Dent 1992;67:847-851   DOI   ScienceOn
9 Hibst R, Keller U. Experimental studies of the application of the Er:YAG laser on dental hard tissue: I. Measurement of the ablation rate. Laser Surg Med 1989;9:338-344   DOI   ScienceOn
10 Keller U, Hibst R. Laser surgery, advanced characterization: Therapeutics and systems II: Ultrastructural changes of enamel and dentin following Er:YAG laser radiation on teeth. Proc SPIE 1200, 408-415, 1990
11 Nelson DGA, Wefel JS, Jongebloed WL, Featherstone JDB. Morphology, histology and crystallography of human dental enamel treated with pulsed low energy infrared laser irradiation. Caries Res 1987;21:411-426   DOI   ScienceOn
12 Morlock BJ, Pippin BJ, Cobb CM, Killoy WJ, Rapley JW. The effect of Nd:YAG laser exposure on root surfaces when used as an adjunct to root planing : an in vitro study. J Periodontol 1992;63:637-641   DOI
13 Wilder-Smith P, Arrastria AM, Schell MJ, Liaw LH, Grill G, Berns Mw. Effect of Nd:YAG laser irradiation and root planing on the root surface: structural and thermal effects. J Periodontol 1995;66:1032-1039   DOI
14 Boehm R, Baechler T, Webster J, Janke S. Laser processes in preventive dentistry. Opt Eng 1977;16:493-496
15 Ito K, Nishikata J, Murai S. Effects of Nd:YAG laser irradiation on removal of a root surface smear layer after root planing : A scanning electron microscopic study. J Periodontol 1993;64:547-552   DOI
16 민신홍, 손동수 Ncodynium:Yttrium-Aluminium-Garnet(Nd:YAG) 레이저 조사가 불 화석 국소도포에 미치는 효과에 관한 실험적 연구. 대한소아치과학회지1986;13;109-117
17 Radvar M, Creanor SL, Gilmour WH, and Payne AP. An evalulation of the effects of an Nd:YAG laser on subgingival calculus, dentine and cementum. An in vitro study. J Clin Periodontol 1995;22:71-77
18 Hibst R, Keller U. Experimental studies of the application of the Er:YAG laser on dental hard tissue: II. Light Microscopic and SEM investigation. Laser Surg Med 1989;9:345-351   DOI   ScienceOn
19 Wigdor H, Abt E, Ashrafi S, Walsh Jr JT. The effect of lasers on dental hard tissues. J Am Dent Assoc 1993;124:65-70
20 Goldman BD, Kaufman JW. Effects of and argon laser on the crystalline properties and rate of dissolution in acid of teeth enamel in presence of sodium fluoride. J Dent Res 1977;56:120-127
21 Stern TH, Sognnaes RF. Laser effect on dental hard tissue. Calif Dent Assoc 1965;33:17-19
22 Adriaens PA, Edwards CA, DeBoever JA, Loesche WJ. Ultrastructural observations on bacterial invasion in cementum and radicular dentin of periodontally diseased human teeth. J Periodontol 1983;59:493-503
23 Nuss RC, Fabian RL, Sarkar R and Puliafito CA. Infrared laser bone ablation. Lasers Surg Med 1988;8:381-391   DOI   ScienceOn
24 Lin PP, Ladner JR, Mitchell JC, Little LA, Horton JE. The effect of a pulsed Nd:YAG laser on periodontally diseased root surfaces : A SEM study. J Dent Res 1992;71(Spec, Issue):299
25 Oho T, Morioka T. Argon laser irradiation increases the acid resistance of human enamel. J Dent Health 1987;37:283-289.   DOI
26 Hibst R. Mechanical effects of Er:YAG laser bone ablation. Lasers Surg Med 1992;12:125-130   DOI   ScienceOn
27 Cobb CM, McCawley TK, Killoy WJ. A preliminary study on the effects of the Nd:YAG laser on root surfaces and subgingival microflora in vivo. J Periodontol 1992;63:701-707   DOI
28 Li ZZ, Code JE, Van De Merwe WP. Er:YAG laser ablation of enamel and dentin of human teeth : Determination of ablation rates at various fluences and pulse repetition rates. Lasers Surg Med 1992;12:625-630   DOI   ScienceOn
29 조종희, 김병옥, 한경윤. Nd:YAG laser 조사가 치근면 상아세관의 노출에 미치는 효 과에 관한 주사전자현미경적 연구. 대한치주과학회지 1993;23:564-576
30 Kayano T, Ochi S, Kiyono K, Yamamoto H, Nakajima S, Mochizuki T. Effect of Er:YAG laser irradiation on human extracted teeth. J Clin Laser Med Surg 1991;9:147-150