title: Femtosecond laser for cavity preparation in enamel and dentin: ablation efficiency related factors.
abstract: To study the effects of laser fluence (laser energy density), scanning line spacing and ablation depth on the efficiency of a femtosecond laser for three-dimensional ablation of enamel and dentin. A diode-pumped, thin-disk femtosecond laser (wavelength 1025 nm, pulse width 400 fs) was used for the ablation of enamel and dentin. The laser spot was guided in a series of overlapping parallel lines on enamel and dentin surfaces to form a three-dimensional cavity. The depth and volume of the ablated cavity was then measured under a 3D measurement microscope to determine the ablation efficiency. Different values of fluence, scanning line spacing and ablation depth were used to assess the effects of each variable on ablation efficiency. Ablation efficiencies for enamel and dentin were maximized at different laser fluences and number of scanning lines and decreased with increases in laser fluence or with increases in scanning line spacing beyond spot diameter or with increases in ablation depth. Laser fluence, scanning line spacing and ablation depth all significantly affected femtosecond laser ablation efficiency. Use of a reasonable control for each of these parameters will improve future clinical application.
authors: Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology &National Engineering Laboratory for Digital and Material Technology of Stomatology &Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health, 22 Zhongguancun Nandajie, Haidian District, Beijing, 100081, China.
authors: H
authors: H
authors: Chen
authors: Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology &National Engineering Laboratory for Digital and Material Technology of Stomatology &Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health, 22 Zhongguancun Nandajie, Haidian District, Beijing, 100081, China.
authors: H
authors: H
authors: Li
authors: Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology &National Engineering Laboratory for Digital and Material Technology of Stomatology &Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health, 22 Zhongguancun Nandajie, Haidian District, Beijing, 100081, China.
authors: Yc
authors: Y
authors: Sun
authors: Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology &National Engineering Laboratory for Digital and Material Technology of Stomatology &Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health, 22 Zhongguancun Nandajie, Haidian District, Beijing, 100081, China.
authors: Y
authors: Y
authors: Wang
authors: Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology &National Engineering Laboratory for Digital and Material Technology of Stomatology &Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health, 22 Zhongguancun Nandajie, Haidian District, Beijing, 100081, China.
authors: Pj
authors: P
authors: Lü
mesh_terms: D003743:Dental Enamel / Q000601:surgery*; D003804:Dentin / Q000601:surgery*; D006801:Humans; D053685:Laser Therapy / Q000295:instrumentation / Q000379:methods*; D007834:Lasers; D018613:Microscopy, Confocal; D008963:Molar / Q000601:surgery; D014081:Tooth Extraction