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Endoscopic Approach to Remove a Dental Implant With Simultaneous Laser-Cystectomy
摘要： Background: Removal of dental implants from the maxillary sinus may require surgical treatment of comorbidities. Method: Canine fossa endoscopy with an additional laterobasal access originally has been used for flapless sinus floor augmentation. The combined technique is presented to remove a titanium screw from the maxillary sinus. The same portals served for dissection of a mucocele using a diode laser. Conclusions: The combination of canine fossa endoscopy and laterobasal access allows an appropriate instrumentation and triangulation of the scope for the endoscopically assisted implant removal and dissection of the mucocele.
关键词： Endoscope,laser,implant removal,maxillary sinus
更新于2025-09-12 10:27:22
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A New Description for Foreign Body Removal in the Maxillary Sinus Using Adapted Optical Fiber Illumination
摘要： Foreign bodies inside to the maxillary sinus can cause several complications such as infection and pain, being necessary surgical procedure for foreign body removal. Keep foreign bodies inside the sinus may generate stimulus to mucous production and inflammatory or infectious sinusitis caused by bacteria or fungi proliferation. The maxillary antrum can be accessed by osteotomy compatible with the size of the foreign body that will be removed and the need of interior visualization of the cavity. In several cases, as the maxillary sinus is a dark cavity and often obstructed by mucous purulent secretion, only the normal light from surgical equipment or from the operation room are limited, which may require some artificial lighting inside of the sinus to aid in the procedure allowing the precise location of foreign body. Therefore, this study aimed to describe a technical innovation for foreign body removal in maxillary sinus using an adapted optical fiber device through 3 different cases.
关键词： foreign body,optical fiber,surgical removal,maxillary sinus
更新于2025-09-12 10:27:22
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Multiple Squamous Neoplasms Arising in a Red Tattoo After Laser Tattoo Removal
摘要： Tattoos are common around the world, although not without risk. Tattooing may result in several complications, including infections, foreign-body and sarcoidal granulomatous reactions, delayed-type hypersensitivity reactions, keloid formation, pseudolymphomas, pseudoepitheliomatous hyperplasia, as well as koebnerization and pathergy of associated pre-existing skin diseases. Tattoos may even potentiate cutaneous neoplasms including benign growths, such as seborrheic keratoses, and malignant neoplasms, such as nonmelanoma skin cancers (NMSCs) and malignant melanoma. Although the mechanism underlying neoplasia due to tattoos is poorly understood, it has been suggested that trauma from the procedure itself, the carcinogenic potential of the dyes, or chronic inflammation could play a role. In this study, we present a case of multiple NMSCs developing within the red pigmented area of a tattoo after repeated laser tattoo removal treatments.
关键词： squamous neoplasms,nonmelanoma skin cancers,red tattoo,laser tattoo removal,tattoo
更新于2025-09-12 10:27:22
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Helical milling of bore holes in Ti6Al4V parts produced by selective laser melting with simultaneous support structure removal
摘要： Selective Laser Melting (SLM) is a powder bed based Additive Manufacturing (AM) process that is currently being established in the series production of Ti6Al4V components in the aviation industry. One advantage is the significantly lower Buy-to-Fly ratio. However, subsequent machining is necessary in order to remove support structures of the SLM process and to fulfill quality requirements. Experimental results on support structure removal and simultaneous finishing of holes by helical milling are presented. Engagement conditions in helical milling are strongly influenced by the support structure. Material removal rates in both peripheral and axial direction are calculated and agree well with the variation of measured forces in these directions. In addition, the surface roughness of the machined holes is affected by the support structure design and may change along the hole perimeter. The findings indicate how support structures should be designed in order to obtain high quality bore holes in one machining step.
关键词： titanium,helical milling,support structure removal,modeling,force,surface roughness,SLM
更新于2025-09-12 10:27:22
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Analysis of Thermal Stress and Temperature Distribution of Laser Power 10.0w and 20.0w on Material Removal in Aluminium Oxide Ceramic
摘要： The momentum look into researches the thermal stress investigation and temperature distribution of laser power 10.0w and 20.0w in aluminum oxide ceramic. Additionally, this paper explores the impact of thermal stress analysis and temperature distribution on material removal prepare. At the point when laser is connected for machining process for making smaller scale groove, temperature distribution assumes an imperative part for that since large amount of heat release by the laser which is influenced the material and deliver a heat affected zone thus material gets melted and vaporize. Thermal Stress is likewise being done because of nearness of thermal impact in material at the time of heat generation and it additionally assumes a decent part to achieve the great material removal handle. Accomplishing a fancied score of particular measurements is conceivable by having control over process parameters of a laser grooving machine which thus represents the measure of material removed. To handle with this, and concentrating on current trend where laser machining is exceptionally Demanded and connected in industry like like bio medical engineering, aerospace, automobile etc., and so on., it is particularly fundamental to concentrate the temperature distribution in the heat affected zone of the material where heat is created (due to heat energy released by laser beam) and equivalent thermal stress in the material body that is in charge of material removal, Achieving a desired groove with great precision. Limited component examination technique utilizing ANSYS is utilized to to simulate and analyze this temperature distribution and equivalent thermal stress of different laser power. In this paper temperature distribution FEM chart with diagrams for 10.0W and 20.0W, Material removal for 10.0W, 20.0W, Equivalent stress FEM diagram with graph for 100W, 200W are appeared furthermore the correlation of laser power in the vicinity of 10.0w and 20.0w are available.
关键词： Temperature Distribution,ANSYS,Laser Power,Material Removal,Thermal Stress
更新于2025-09-12 10:27:22
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Influence of laser spot size and shape on ablation efficiency using ultrashort pulse laser system
摘要： Ultra-short pulsed laser systems provide high accuracy and high-quality materials processing for various kinds of applications. However, one of the highest industrial needs is to identify most efficient processes to achieve high throughput. In terms of ultra-short pulsed laser processing of metals, the specific removal rate (ablated volume per time and average power) shows a maximum value i.e. there exists an optimum fluence where the ablation process is most efficient. In this study the influence of spot size and shape (Gaussian and Top Hat) on the ablation efficiency on AISI 304 (1.4301) steel grade was examined using 10 ps and 350 fs laser pulses at wavelengths of 1064 nm and 1030 nm. The investigation revealed a significant drop of the specific removal rate with increasing Gaussian spot size for both pulse duration. While this behaviour is less pronounced for a Top Hat, showing just 8% decrease of specific removal rate for spot sizes bigger than 40 μm.
关键词： ablation efficiency,ultrashort laser pulses,Top Hat,specific removal rate,laser spot size
更新于2025-09-12 10:27:22
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Picosecond laser lift-off method for fracture and debonding of copper oxide layer grown on copper substrate
摘要： The objective of this work is to investigate the ablative removal behavior of copper oxide under the picosecond laser ( pulse duration 12 ps and wavelength 1064 nm) irradiation. For this purpose, a thin CuO layer with a thickness of about 750 nm is synthesized on a pure copper substrate by the dipping method to serve as the target samples for experimental tests. It is shown that, unlike the pure ablation behavior, the removal process of the CuO layer is mainly based on the nonthermal lift-o? e?ect, by which the stripping of the whole piece of oxide ?lms from the substrate can be achieved with a single pulse shot. A minimum ?uence required for peeling o? the layer is determined to be about 0.11 J/cm2. Further analyses demonstrate that the entire pop-o? of the CuO layer caused by the con?ned ablation at the interface occurs only if the laser ?uences are applied below 0.62 J/cm2. However, when it comes to the cases at higher ?uences, a thin residual layer can be observed remaining on the substrate. To explain this phenomenon, a plausible interpretation with respect to the ablation induced by nonlinear absorption and impact ionization is proposed, which declares that it is the combination of direct ablation and the interface lift-o? that ultimately causes such special removal features. In addition, the in?uence of the oxide ?lm thickness on the debonding threshold and the removal behavior are additionally assessed.
关键词： lift-off effect,damage threshold,thin oxide ?lms,laser selective removal
更新于2025-09-12 10:27:22
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Prediction of surface roughness and material removal rate in laser assisted turning of aluminium oxide using fuzzy logic
摘要： Processing of ceramics with good surface integrity and high material removal rate is a challenging task in the manufacturing industry. Laser assisted machining (LAM) is one of the benchmark technique currently used in industry to process difficult to machine materials. In LAM, laser is used as source to heat the work piece and simultaneously remove the softened material by cutting tool without changing the material microstructure. Since many process parameters are involved in LAM, experimental investigation of processing of ceramics is expensive. So the main objective of this present work is to develop an Artificial Intelligence model to understand the process mechanics and for the prediction of surface roughness and material removal rate (MRR) during laser assisted turning of Aluminium oxide using fuzzy logic. Input parameters are assumed as triangular and Gaussian function and output parameters are assumed as trapezoidal function. It is inferred that increase in cutting speed and pulsed frequency of laser, there is an improvement in surface finish, whereas increase of feed rate results in deterioration of surface integrity. The material removal rate is directly proportional to feed, speed, depth of cut and pulsed frequency of laser. There is a better agreement between experimental and fuzzy model values. The proposed model predicts the surface roughness and MRR with prediction error of 15.76 and 7.69 % respectively.
关键词： material removal rate,Laser assisted machining,fuzzy logic,surface roughness,Ceramics
更新于2025-09-12 10:27:22
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State of the Art on Laser Assisted Electrochemical Machining
摘要： Laser Assisted Electrochemical Machining (LAECM) has proven its advantages and applications over almost all the range of conductive materials. It offers its adroitness to generate simple shapes to complex shapes from macro to micro machining. Laser assisted ECM is a hybrid approach of machining which has been manifested to obtain improved results in terms of surface integrity, thermal damage, geometrical tolerance and material removal rate. Laser assisted Electrochemical Machining (LAECM) is a hybrid machining process in which laser enhances the electrochemical dissolution process by increasing the temperature and hence the current density of the electrolyte. Laser helps to remove material from the particular machining zone and stray machining effect is reduced and thus improves the precision and efficiency of LAECM, also productivity. New route of laser assisted hybrid machining processes has been built in the past decade by few of the researchers to reduce the intrinsic problems of ECM. This paper reviews on the investigation into LAECM process. The article also highlights various possibilities and applications of LAECM process. There are various challenges in LAECM process which have been also discussed in this paper.
关键词： Laser Assisted Electrochemical Machining,electrochemical dissolution,material removal rate,LAECM,hybrid machining
更新于2025-09-12 10:27:22
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Development of Laser and Electrochemical Machining Based on Internal Total Reflection
摘要： To address the issues of the existing laser and electrochemical machining (LECM) processes in controlling the machining precision, machining depth limit, and taper angle, a novel LECM based on internal total reflection (LECM-ITR) has been proposed. In LECM-ITR, both the electrolyte jet and laser beam were guided and transferred to the machining area, synchronously. Since the tube electrode could feed into the workpiece, the laser could act on the high depth machining area with less laser attenuation. The materials could be removed by using laser-materials interaction and electrochemical dissolution. Small holes with depth of 2 mm have been processed on aluminum alloy and stainless-steel workpiece successfully. Experimental results showed that LECM-ITR could decrease the side gap by 23.6%, reduce the taper angle by 60.8%, and improve materials removal rate by 118.8%. The mechanism of materials removal rate and precision enhancement by LECM-ITR were discussed, including (1) Laser induced temperature rise at the machining area could improve the machining efficiency of ECM with the increased electric current density; (2) The formed anodic oxide layer in larger thickness could enhance the machining precision of ECM with increasing time constant of the electric double layer at the machining area.
关键词： internal total reflection,materials removal rate,Laser and electrochemical machining,taper angle,machining precision
更新于2025-09-12 10:27:22