A Roughness Study of Ytterbium-Doped Potassium Yttrium Tungstate (YB: KYW) Thin-Disk Femtosecond Ablated Dentin
Journal of Lasers in Medical Sciences,
Vol. 5 No. 1 (2014),
21 December 2013
,
Page 32-38
Abstract
Introduction: The aim of this study was to evaluate the morphological changes and quantitatively assess the roughness of dentin after the ablation with a Ytterbium-Doped Potassium Yttrium Tungstate (YB: KYW) thin-disk femtosecond pulsed laser of different fluences, scanning speeds and scanning distances.
Method: Twelve extracted human premolars were sectioned into crowns and roots along the cementum-enamel junction, and then the crowns were cut longitudinally into sheets about 1.5 mm thick with a cutting machine. The dentin samples were fixed on a stage at focus plane. The laser beam was irradiated onto the samples through a galvanometric scanning system, so rectangular movement could be achieved. After ablation, the samples were examined with a scanning electron microscope and laser three-dimensional profile measurement microscope for morphology and roughness study.With increasing laser fluence, dentin samples exhibited more melting and resolidification of dentin as well as debris-like structure and occluded parts of dentinal tubules.
Results: When at the scanning speed of 2400mm/s and scanning distance of 24μm, the surface roughness of dentin ablated with femtosecond pulsed laser decreased significantly and varied between values of dentin surface roughness grinded with two kinds of diamond burs with different grits. When at the scanning speed of 1200mm/s and scanning distance of 12μm, the surface roughness decreased slightly, and the surface roughness of dentin ablated with femtosecond pulsed laser was almost equal to that grinded with a low grit diamond bur.
Conclusion: This study showed that increased laser influence may lead to more collateral damage and lower dentin surface roughness, while scanning speed and scanning distance were also negatively correlated with surface roughness. Adequate parameters should be chosen to achieve therapeutic benefits, and different parameters can result in diverse ablation results.
- laser
- dentin
- morphology
How to Cite
References
Xu H, Kelly JR, Jahanmir S, Thompson VP, Rekow ED. Enamel subsurface damage due to tooth preparation with diamonds. J Dent Res 1997;76(10):1698-1706.
Keller U, Hibst R. Effects of Er:YAG laser in caries treatment: a clinical pilot study. Lasers Surg Med 1997;20(1):32-8.
Ekworapoj P, Sidhu SK, McCabe JF. Effect of different power parameters of Er, Cr: YSGG laser on human dentine. Laser Med Sci 2007;22(3):175-182.
Aoki A, Ishikawa I, Yamada T, Otsuki M, Watanabe H, Tagami J, et al. Comparison between Er:YAG laser and conventional technique for root caries treatment in vitro. J Dent Res 1998;77(6):1404-14.
Gökçe B. Effects of Er: YAG Laser Irradiation on Dental Hard Tissues and All-Ceramic Materials: SEM Evaluation. Scanning Electron Microscopy 2012:179-212.
Lobene RR, Bhussry BR, Fine S. Interaction of carbon dioxide laser radiation with enamel and dentin. J Dent Res 1968;47(2):311-7.
Kuroda S, Fowler BO. Compositional, structural, and phase changes in in vitro laser-irradiated human tooth enamel. Calcif Tissue Int 1984;36(4):361-9.
STABHOLZ A, KHAYAT A, WEEKS DA, NEEV J, TORABINEJAD M. Scanning electron microscopic study of the apical dentine surfaces lased with Nd: YAG laser following apicectomy and retrofill. Int Endod J 1992;25(6):288-91.
Melcer J. Latest treatment in dentistry by means of the CO2 laser beam. Lasers Surg Med 1986;6(4):396-8.
Youssef M, Quinelato A, Youssef F, Pelino JP, Salvadori MC, Mori M. Dentinal surface-cutting efficiency using a high-speed diamond bur, ultrasound and laser. Laser Phys 2008;18(4):472-7.
Dederich DN, Bushick RD. Lasers in dentistry. American Dental Association 2004;135(2):204-12.
Bhat AM. Lasers in prosthodontics—An overview part 1: Fundamentals of dental lasers. J Ind Prosthodontic Soc 2010;10(1):13-26.
Roebuck EM, Whitters CJ, Saunders WP. The influence of three Erbium: YAG laser energies on the in vitro microleakage of Class V compomer resin restorations. Int J Paediatric Dent 2001;11(1):49-56.
Li Z, 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. Laser Surg Med 1992;12(6):625-630.
Keller U, Hibst R, Geurtsen W, Schilke R, Heidemann D, Klaiber B, et al. Erbium: YAG laser application in caries therapy. Evaluation of patient perception and acceptance.J Dent 1998;26(8):649-56.
Keller U, Hibst R. Experimental studies of the application of the Er:YAG laser on dental hard substances: II. Light microscopic and SEM investigations. Laser Surg Med 1989;9(4):345-51.
Raucci-Neto W, Chinelatti MA, Ito IY, Pécora JD, Palma-Dibb RG. Influence of Er:YAG laser frequency on dentin caries removal capacity. Microsc Res Techniq 2011;74(3):281-6.
Niemz MH, Kasenbacher A, Strassl M, Bäcker A, Beyertt A, Nickel D, et al. Tooth ablation using a CPA-free thin disk femtosecond laser system. Appl Phys B 2004;79(3):269-71.
Daskalova A, Bashir S, Husinsky W. Morphology of ablation craters generated by ultra-short laser pulses in dentin surfaces: AFM and ESEM evaluation. Appl Surf Sci 2010;257(3):1119-24.
Portillo MM, Lorenzo LM, Sanchez LJ, Peix Sánchez M, Albaladejo A, García A, et al. Morphological alterations in dentine after mechanical treatment and ultrashort pulse laser irradiation. Lasers Med Sci 2012;27(1):53-8.
Bello-Silva MS, Wehner M, Eduardo CP, Lampert F, Poprawe R, Hermans M, et al. Precise ablation of dental hard tissues with ultra-short pulsed lasers. Preliminary exploratory investigation on adequate laser parameters. Lasers Med Sci 2013;28(1):171-84.
Ji L, Li L, Devlin H, Liu Z, Jiao J, Whitehead D. Ti:sapphire femtosecond laser ablation of dental enamel, dentine, and cementum. Lasers Med Sci 2012;27(1):197-204.
Luengo MC, Portillo M, Sanchez JM, Peix M, Moreno P, García A, et al. Evaluation of micromorphological changes in tooth enamel after mechanical and ultrafast laser preparation of surface cavities. Lasers Med Sci 2013;28(1):267-73.
Chichkov BN, Momma C, Nolte S, Von Alvensleben F, T U Nnermann A. Femtosecond, picosecond and nanosecond laser ablation of solids. Appl Phys A 1996;63(2):109-15.
Juhasz T, Kastis GA, Suarez C, Bor Z, Bron WE. Timeresolved observations of shock waves and cavitation bubbles generated by femtosecond laser pulses in corneal tissue and water. Laser Surg Med 1996;19(1):23-31.
Feit MD, Rubenchik AM, Kim BM, Da Silva LB, Perry MD. Physical characterization of ultrashort laser pulse drilling of biological tissue. Appl Surf Sci 1998;127:869-74.
Gamaly EG, Rode AV, Luther-Davies B, Tikhonchuk VT. Ablation of solids by femtosecond lasers: Ablation mechanism and ablation thresholds for metals and dielectrics. Phys Plasmas 2002;9(3):949-58.
Oraevsky AA, Da Silva LB, Rubenchik AM, Feit MD, Glinsky ME, Perry MD, et al. Plasma mediated ablation of biological tissues with nanosecond-to-femtosecond laser pulses: relative role of linear and nonlinear absorption. IEEE journal of selected topics in quantum electronics 1996;2(4):801-9.
Rode AV, Gamaly EG, Luther-Davies B, Taylor BT, Graessel M, Dawes JM, et al. Precision ablation of dental enamel using a subpicosecond pulsed laser. Aust Dent J 2003;48(4):233-9.
Kamata M, Imahoko T, Ozono K, Obara M. Materials processing by use of a Ti: Sapphire laser with automaticallyadjustable pulse duration. Appl Phys A 2004;79(7):1679-85.
Rego FFA, Dutra-Correa M, Nicolodelli G, Bagnato VS, de Araujo MT. Influence of the hydration state on the ultrashort laser ablation of dental hard tissues. Lasers Med Sci 2013;28(1):215-22.
Sun YC, Vorobyev A, Liu J, Guo C, Lu PJ. [Femtosecond pulsed laser ablation of dental hard tissues with numerical control: a roughness and morphology study]. Zhonghua Kou Qiang Yi Xue Za Zhi 2012;47(8):486-9.
Ayad MF, Rosenstiel SF, Hassan MM. Surface roughness of dentin after tooth preparation with different rotary instrumentation. J Prosthet Dent 1996;75(2):122-8.
Goodacre CJ, Campagni WV, Aquilino SA. Tooth preparations for complete crowns: an art form based on scientific principles. J Prosthet Dent 2001;85(4):363-76.
Al-Omari WM, Mitchell CA, Cunningham JL. Surface roughness and wettability of enamel and dentine surfaces prepared with different dental burs. J Oral Rehabil 2001;28(7):645-50.
- Abstract Viewed: 279 times
- PDF Downloaded: 148 times