Morphological analysis of dentin tissue after Er, Cr: YSGG laser irradiation

The object of this study is to evaluate the morphological changes of dentin tissue after Er, Cr: YSGG laser Irradiation. The wavelength is 2.78 μm with pulse repetition rate of 20 Hz and pulse duration of 140 μs. The samples extracted from sound intact adult human premolars were cut into 1 mm thick dentin slices, and then polished by abrasive papers. After preparation, specimens were randomly divided into two groups: one group treated with conventional drills (a diamond drill and a fissure bur), and the other group treated with lasers at four different power settings (2W to 3.5W). The morphological alterations produced by the different treatments were observed and compared by scanning electron microscope (SEM). It showed that the dentin surfaces had distinct and characteristic morphological alteration with different power settings. Compared with the samples treated with conventional drills, the irradiated samples revealed an absent smear layer with open dentinal tubules. The ablation of intertubular dentin was more evident than that of peritubular dentin.

[1]  Raimund Hibst,et al.  Experimental studies of the application of the Er:YAG laser on dental hard substances: I. Measurement of the ablation rate , 1989, Lasers in surgery and medicine.

[2]  J. Featherstone,et al.  Effect of CO2 laser on pulpal temperature and surface morphology: an in vitro study. , 2001, Journal of dentistry.

[3]  J L Gilbert,et al.  Shear Strength of Composite Bonded to Er:YAG Laser-prepared Dentin , 1996, Journal of dental research.

[4]  Boris Majaron,et al.  Thermomechanical laser ablation of hard dental tissues: an overview of effects, regimes, and models , 1999, Photonics West - Biomedical Optics.

[5]  J. Walsh,et al.  Erbium laser ablation of dental hard tissue: Effect of water cooling , 1996, Lasers in surgery and medicine.

[6]  J. McCabe,et al.  Effect of different power parameters of Er,Cr:YSGG laser on human dentine , 2007, Lasers in Medical Science.

[7]  A. V. McDonald,et al.  A comparative study of etching enamel by acid and laser , 2005, Lasers in Medical Science.

[8]  Steven R. Visuri,et al.  Caries inhibition potential of Er:YAG and Er:YSGG laser radiation , 1996, Photonics West.

[9]  H. Yamamoto,et al.  Prevention of Dental Caries by Acousto-optically Q-switched ND:YAG Laser Irradiation , 1980, Journal of dental research.

[10]  Daniel Fried,et al.  IR laser ablation of dental enamel , 2000, Photonics West - Biomedical Optics.

[11]  Tsukasa Akasaka,et al.  Three-dimensional topographic scanning electron microscope and Raman spectroscopic analyses of the irradiation effect on teeth by Nd:YAG, Er: YAG, and CO(2) lasers. , 2004, Journal of biomedical materials research. Part B, Applied biomaterials.

[12]  Christian Apel,et al.  Influence of the water content in dental enamel and dentin on ablation with erbium YAG and erbium YSGG lasers. , 2006, Journal of biomedical optics.

[13]  C Gorfil,et al.  Examination of tooth pulp following laser beam irradiation , 1987, Lasers in surgery and medicine.

[14]  C Loiacono,et al.  Lasers in dentistry. , 1993, General dentistry.

[15]  K. Matsumoto,et al.  Morphological study on the capability of Er:YAG laser irradiation for root canal preparation. , 2000, Journal of clinical laser medicine & surgery.

[16]  Daniel Fried,et al.  Selective targeting of protein, water, and mineral in dentin using UV and IR pulse lasers: The effect on the bond strength to composite restorative materials , 2004, Lasers in surgery and medicine.