Laser equipment represents surely one of the most captivating technologies in the practice of dental medicine. Throughout the last two decades, numerous scientific publications have emerged in literature, concerning laser equipments and their applications in the field of dental medicine. Presently, in accordance with their specific wavelength, laser equipments are available on a large scale. […]
I progressi nella chirurgia ossea: il laser Er: YAG in chirurgia orale ed implantologia
The erbium-doped yttrium aluminium garnet (Er:YAG) laser has emerged as a possible alternative to conventional methods of bone ablation because of its wavelength of2.94 μm, which coincides with the absorption peak of water. Over the last decades in several experimental and clinical studies, the widespread initial assumption that light amplification for stimulated emission of radiation […]
Advances in bone surgery: the Er:YAG laser in oral surgery and implant dentistry
The erbium-doped yttrium aluminium garnet (Er:YAG) laser has emerged as a possible alternative to conventional methods of bone ablation because of its wavelength of2.94 μm, which coincides with the absorption peak of water. Over the last decades in several experimental and clinical studies, the widespread initial assumption that light amplification for stimulated emission of radiation […]
I fondamenti del laser
The word “laser” is an acronym for Light Amplification by Stimulated Emission of Radiation. Lasers are finding ever increasing military applications — principally for target acquisition, fire control, and training. These lasers are termed rangefinders, target designators, and direct-fire simulators. Lasers are also being used in communications, laser radars (LIDAR), landing systems, laser pointers, guidance […]
Storia del laser in dermatologia
In the 1950s, based on the theory of stimulating radiant energy published by Albert Einstein in 1916, the collaboration of physicists and electrical engineers, searching for monochromatic radiation to study the spectra of molecules, led to the invention of the first laser in 1960. Ophthalmologists and dermatologists were the first to study the biological effects […]
MODELLING AND MEASUREMENTS OF LASER-SKIN THERMAL INTERACTION
Thermal laser-skin interaction has principal role in laser dermatology, and it can be successfully modelled and measured. For modelling, the seminar covers all the steps involved, which range from determination of laser beam and skin optical properties, treatment of light propagation in the tissue, thermal diffusion of heat to thermal effects prediction. As a simple […]
LASER RADIATION PROPAGATION AND HEAT TRANSFER INTO CELLS AND TISSUES
In this paper we shall approach only the interaction of laser radiations with highly scattering and/or absorbing biological materials (i.e., opaque materials). The photon multiple scattering by cells and tissues is approached from the perspective of the general propagation theory (i.e., simple diffusion) of a particular physical magnitude, provoked by its conjugated gradient. In this […]
Results of fractional ablative facial skin resurfacing with the erbium:yttrium-aluminium-garnet laser 1 week and 2 months after one single treatment in 30 patients
The erbium:yttrium-aluminium-garnet (Er:YAG) laser has recently been used in the fractional resurfacing of photo-aged skin. Our study evaluated the results after one single session of fractional resurfacing with Er:YAG. Thirty women participated in the study, with an average age of 46 years, skin types from II to IV, and wrinkle grades I to III. The […]
Instabilities of Short-Pulse laser Propagation through Plasma Channels
The stability of short laser pulses propagating through plasma channels is investigated theoretically.Perturbation to the laser pulse are shown to modify the ponderomotive pressure, which distors the dielectric properties of the plasma channel. The channel perturbation then further distors the laser pulse. A set of coupled mode equation is derived and a matrix dispersion relation […]
Computer Simulations of Laser Ablation of Molecular Substrates
Laser ablation of molecular systems constitutes a basis for a diverse range of well-established applications, from matrix assisted laser desorption/ionization (MALDI) and other laser-driven techniques for mass spectrometric analysis of large nonvolatile biomolecules1-3 to laser surgery4 and to surface microfabrication and pulsed laser deposition (PLD) of organic films and coatings. Emerging applications of laser ablation […]