The Use of Nd:YAG Laser on Permanent Molar with Periapical Lesions, Two Year Follow Up

Işıl Özgül KALYONCU, Edibe EĞİL, İlknur TANBOĞA
943 391


It is considered that Nd:YAG (1,064 nm) laser has a bactericidal
effect against bacteria to a depth of 1.000 μm. The aim of the study
was to assess the efficacy of Nd:YAG laser irradiation on permanent
molar root canal disinfection and follow up of the healing process.
The Nd:YAG laser system, emitting at a wavelength of 1064 nm,
was applied for 46 and 36 numbered root canal for three times
(1.5 W, 15 Hz, 5s) in working length of a 10-year-old girl patient
with caries cavities extended to the pulp and extensive periapical
radiolucency. At the third session of Nd:YAG laser application the
patient was asymptomatic. After two years, the clinical and
radiographic follow up revealed that the patient was asymptomatic
and the periapical tissues and restored tooth were healthy. The
Nd:YAG laser irradiation is not an alternative but a possible
supplement to existing protocols for root canal disinfection.


bacterial elimination, chronic periapical lesions, Nd:YAG laser, pediatric dentistry, permanent molars.

Full Text:



Franzen R, Gutknecht N, Falken S, Heussen N, Meister J. Bactericidal effect of a Nd:YAG laser on Enterococcus faecalis at pulse durations of 15 and 25 ms in dentine depths of 500 and 1,000 μm. Lasers Med Sci.2011; 26(1):95-101.

Yasuda Y, Kawamorita T, Yamaguchi H, SaitoT. Bactericidal effect of Nd:YAG and Er:YAG lasers in experimentally infected curved root canals. Photomed Laser Surg. 2010; 28(2): 75-78.

A Stabholz, The role of laser technology in modern endodontics, International Congress Series 2003; 1248:21–27.

Eduardoa E, Gouw-Soaresa S. The use of lasers for endodontic applications in dentistry. Medical Laser Application 2001;16(3): 231–243.

Gutknecht N. Lasers in endodontics: preconditions for therapeutical succes, International Congress Series 2003;1248: 101-108.

Mehvarzfar P, Saghiri M.A, Asatourian A, Fekrazad R, Karamifar K, Eslami G, Dadresanfar B. Additive effect of a diode laser on the antibacterial activity of 2.5% NaOCl, 2% CHX and MTAD against enterococcus faecalis contaminating root canals: an in vitro study. Journal of Oral Science 2011; 53(3):355-360.

Arnabat J, Escribano C, Fenosa A, Vinuesa T, Gay-Escoda C, Berini L, Viñas M. Bactericidal activity of erbium, chromium:yttrium–scandium–gallium–garnet laser in root canals. Laser Med Sci 2010 ; 25(6): 805-810.

Piccolomini R, D’Arcangelo C, D’Ercole S, Catamo G, Schiaffino G, De Fazio P. Bacteriologic evaluation of the effect of Nd:YAG laser irradiation in experimental infected root canals. J Endod 2002; 28: 276–278.

Folwaczny M, Mehl A, Jordan C, Hickel R. Antibacterial effects of pulsed Nd: YAG laser radiation at different energy settings in root canals. J Endod 2002; 28: 24–29.

Bergmans L, Moisiadis P, Teughels W, Van Meerbeek B, Quirynen M, Lambrechts P. Bactericidal effect of Nd:YAG laser irradiation on some endodontic pathogens ex vivo. Int Endod J 2006;39:547–557.

Schoop U, Kluger W, Moritz A, Nedjelik N, Georgopoulos A, Sperr W. Bactericidal effect of different laser systems in the deep layers of dentin. Lasers Surg Med 2004; 35:111–116.

Kouchi Y, Ninomiya J, Yasuda H, Fukui K, Moriyama T, Okamoto H. Location of streptococcus mutans in the dentinal tubules of open infected root canals. J Dent Res 1980;59(12):2038–2046.

Berutti E, Marini R, Angeretti A. Penetration ability of different irrigants into dentinal tubules. J Endod 1997;23(12):725–727.

Haapasalo M, Ørstavik D (1987) In vitro infection and disinfection of dentinal tubules. J Dent Res;66:1375–1379.

Takeda FH, Harashima T, Eto JN, Kimura Y, Matsumoto K. Effect of Er:YAG laser treatment on the root canal walls of human teeth: a SEM study. Endod Dent Traumatol 1998;14:270–273.

Anic I, Segovic S, Katanec D, Prskalo K, Najzar-Fleger D. Scanning electron microscopic study of dentin lased with argon, CO2, and Nd:YAG laser. J Endod 1998; 24:77–81.

Khan MA, Khan MF, Khan MW, Wakabayashi H, Matsumoto K. Effect of laser treatment on the root canal of human teeth. Endod Dent Traumatol 1997; 13:139–145

Byström A, Sundqvist G, Bacteriologic evaluation of the effect of 0.5 percent sodium hypochlorite in endodontic therapy. Oral Surg Oral Med Oral Pathol 1983; 55:307–312.

Gutknecht N, Moritz A, Conrads G, Sievert T, Lampert F. Bactericidal effect of the Nd:YAG laser in vitro root canals. J Clin Laser Med Surg 1996;14:77– 80.

Gutknecht N, Kaiser F, Hassan A, Lampert F. Long-term clinical evaluation of endodontically treated teeth by Nd:YAG lasers. J Clin Laser Med Surg 1996;14: 7– 11.

Gutknecht N, Behrens VG. The Nd–YAG laser as an aid to root canal obturation. 79th Annual World Dental Congress of FDI, Monduzzi Editore. Milan, 1991:275– 280.

Bergmans L, Moisiadis P, Teughels W, Van Meerbeek B, Quirynen M, Lambrechts P, Bactericidal effect of Nd:YAG laser irradiation on some endodontic pathogens ex vivo. Int Endod J 2006: 39;547–557.

Klinke T, Klimm W, Gutknecht N. Antibacterial effects of Nd:YAG laser irradiation within root canal dentine. J Clin Laser Med Surg 1997;15:29–31.

Gekelman D. In vitro study of the effects of Nd:YAG laser irradiation on the apical seal of endodontic fillings performed with dentin plugs. Proceedings ISLD,Brussels 2000, 15