Method to control depth error when ablating human dentin with numerically controlled picosecond laser: a preliminary study
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Laser Ablation
Silver nanomaterials were fabricated through laser ablation in double distilled water with ~2 ps laser pulses. Effect of input laser fluence on the fabrication of nanoparticles and their nonlinear optical behaviour was investigated.
Laser Ablation
Distilled water
Nanomaterials
Silver nanoparticle
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Deposition
Stoichiometry
Laser Ablation
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Picosecond
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Picosecond spectroscopy is a relatively new field of science that utilizes ultrashort laser pulses to monitor events taking place in the 10(-12) second regime. The continuing development of picosecond spectroscopy has made possible the detection and measurement of the primary events in many physical and tiological processes. This article describes a currently used picosecond spectroscopy system that is capable of reliably recording picosecond events. Two areas of picosecond research are discussed; one concerns the interaction of electrons in fluids, and the second the primary events in vision.
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In order to investigated the effect of dentin inorganic material during dentin bond.This study investigated the tensile bond strength (TBS) between 4-META/MMA-TBB resin and dentin treated with several dentin treating methods.When the dentin was treated with acid-salt pretreating solution system (APSS) consisting of 10% citric acid and 3% ferric chloride to remove smear layer, and then re-treated with NaOCl to resolve dentin collagen and reveal dentin inorganic material, TBS of the dentin was 5.93 MPa, and higher than that of control group (3.71 Mpa) (P < 0.05) whose dentin was treated with distilled water only.It was suggested that dentin inorganic material did play a proper role in dentin bond.
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Smear layer
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The depth dependence of fluence, vectorial and planar fluence, energy fluence, vectorial and planar energy fluence and absorbed dose has been calculated in 5 and 20 MeV electron beams in water. The shape of these distributions has been compared with analytic expressions for fluence and absorbed dose and the general mechanisms governing the shape of the depth dose curve have been explained. In particular it is demonstrated that the depth dependence of planar energy fluence and mean energy is very similar, and so is the case for fluence and absorbed dose and primary fluence and absorbed dose from primaries with inclusion of fast secondaries. The results are useful for dosimetry and dose planning in high energy electron beams.
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Phototropism
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Femtosecond laser ablation of stainless steel was studied. Two ablation regimes were identified. Analytical model of metal ablation volume calculation is proposed and confronted to experimental results. For desired microtexturing, the fluence and number of pulses are essential.
Laser Ablation
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