Applications of Laser Welding in Dentistry: A State-of-the-Art Review

Perveen, Asma; Molardi, Carlo; Fornaini, Carlo

doi:10.3390/mi9050209

Cited by 45 publications

(42 citation statements)

References 107 publications

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“…The progress that has been made in the recent years in the field of dentistry enables more proficient and safer work, as well as a predictable treatment outcomes [1][2][3]. One of the brand-new technologies is a laser that is becoming more and more popular in dental clinics and supports traditional forms of treatment while replacing classic technologies [4][5][6][7][8][9]. The Erbium-doped Yttrium Aluminium Garnet (Er: YAG) laser presents several advantages over a conventional bur preparation [10].…”

Section: Introductionmentioning

confidence: 99%

Removal of Composite Restoration from the Root Surface in the Cervical Region Using Er: YAG Laser and Drill—In Vitro Study

et al. 2020

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Background: Recently, the defects of the tooth surface in the cervical region are often restored using composite filling materials. It should meet the needs of the patients regarding esthetics and material stability. The aim of the study was to analyze the tooth root surface at the cervical region after the removal of the composite filling material by means of the Erbium-doped Yttrium Aluminium Garnet (Er: YAG) laser or drill using the scanning electron microscopy (SEM) and fluorescence microscopy. Materials and Methods: For the purposes of this study, 14 premolar teeth (n = 14) were removed due to orthodontic reasons. The rectangular shape cavities with 3 mm in width and 1.5 mm in height were prepared with a 0.8 mm bur on high-speed contra-angle in the tooth surface just below cemento-enamel junction (CEJ) and filled with the composite material. The composite material was removed with the Er: YAG laser at a power of 3.4 W, energy 170 mJ, frequency 20 Hz, pulse duration 300 μs, tip diameter 0.8 mm, air/fluid cooling 3 mL/s, and time of irradiation: 6 sec, at a distance from teeth of 2 mm (G1 group, n = 7) or a high-speed contra-angle bur (G2 group, n = 7). After the removal of composite material, the surfaces of teeth were examined using the scanning electron microscopy (SEM) and fluorescence microscopy. Results: The Er: YAG irradiation allowed to remove completely the composite material from the tooth cavity. The study confirmed, that the ends of collagen fibers were only partially denatured after the Er: YAG laser application. Conclusion: It has been proved that using the Er: YAG laser is an effective and safe method of composite removal for the dentin surface.

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Section: Introductionmentioning

confidence: 99%

Removal of Composite Restoration from the Root Surface in the Cervical Region Using Er: YAG Laser and Drill—In Vitro Study

et al. 2020

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“…Non-precious Ni-Cr based alloys are widely used for dental prostheses instead of the precious gold and titanium alloys owing to its much lower cost, good mechanical, thermal and corrosion resistance properties besides their availability. [1,2] When choosing metallic alloys that would be used in the biological systems, an attention must be drawn to the body acceptability of these alloys or what is called the biocompatibility. [2,3] The oral environment is a very complex electrolyte environment with a large number of microorganisms, in which metal prostheses corrode and release metal ions.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of Dental Ni‐Cr Wirolloy Coated with Eco‐friendly Films in Artificial Saliva

Ghoneim

Abdellatif

Ameer

2019

Zeitschrift anorg allge chemie

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The electrochemical corrosion behavior of the non-precious Ni-Cr Wirolloy, being used in dentistry, was investigated before and after applying of two types of eco-friendly coatings, polyvinyl silsesquioxane (PVS) and nano-hydroxyapatite (nHAP) separately in artificial saliva solution at 37°C for 14 d of immersion. The study aimed to investigate the effectiveness of the introduced coating films in enhancing the corrosion resistance of the alloy, and in decreasing the leaching of the toxic Ni ions from the alloy into the environment. The electrochemical corrosion investigation methods used are; open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The evaluated results revealed that the electrochemically coated alloy with PVS. prepared at

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confidence: 99%

A Process Optimization Strategy for Texturing 3D Surfaces Using Direct Laser Interference Patterning

2021

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Due to its flexibility and adaptability, laser materials processing is used in various fields of applications, such as cutting, welding or surface modifications, breaking in several cases the limits of conventional processing methods. [1][2][3][4] Ultrashort pulsed laser modification enables the creation of microstructures for individual functionalities on almost every material. [5,6] For example, direct laser writing (DLW) or direct laser interference patterning (DLIP) are laser micromachining techniques that are capable to create surface structures with high resolutions down to μm-range. [7][8][9] Such microstructures enable the realization of unique surface properties such as hydrophobic or antibacterial characteristics as well as optimized tribological properties. [10][11][12] A particular challenge in laser surface functionalization is the adaptability to 3D freeform components, which has become a significant importance for technical applications in recent years. [13] Typical approaches that are being implemented in industry or research laboratories for treated 3D parts are for instance, Computerized Numerical Control (CNC) systems as well as robot systems, which are in some cases limited in accuracy (in particular the robot systems). [14,15] Further progress requires the adaption of texturing results to real parts with 3D shaped geometries.In this frame, the presented work herein examines the utilization of the DLIP technology in combination with a new hexapod positioning system and its influence on the uniformity of the produced microstructures. The main advantage of the new hexapod system is the high motion accuracy and repeatability as well as its simplicity to be combined with existing DLIP optical heads.The structures were fabricated using the DLIP technology. The used setup is illustrated in Figure 1a. To produce the line-like pattern geometry, two Gaussian laser beams were overlapped on the substrate at a certain angle (Θ). At the region where the beams overlap, a periodic intensity profile is produced which can be directly transferred to the materials surface by selective melting or ablation at the interference maxima positions. [16] The used system utilizes a solid-state Nd:YVO 4 laser (Edgewave PX200) emitting 1064 nm wavelength with 10 ps pulse duration and maximum output power of 100 W. The laser fluence was set to 1.21 J cm À2 and the spot diameter of the interference area was about 100 μm (irradiated spot on the sample). Further relevant processing parameters are the distance between the DLIP pixels which can be described by the overlap and the hatch distance (HD). For instance, Aguilar-Morales et al. mentioned that the HD has been identified as the most critical parameter for the homogeneity. [17] Additional information about the experimental setup has already been published in previous work. [18] The positioning of the samples were performed using a hexapod (Aerotech HEX500-350 HL) (see Figure 1a). The main advantages of this system are the flexible sample positioning with six degrees of fre...

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Applications of Laser Welding in Dentistry: A State-of-the-Art Review

Cited by 45 publications

References 107 publications

Removal of Composite Restoration from the Root Surface in the Cervical Region Using Er: YAG Laser and Drill—In Vitro Study

Removal of Composite Restoration from the Root Surface in the Cervical Region Using Er: YAG Laser and Drill—In Vitro Study

Electrochemical Behavior of Dental Ni‐Cr Wirolloy Coated with Eco‐friendly Films in Artificial Saliva

A Process Optimization Strategy for Texturing 3D Surfaces Using Direct Laser Interference Patterning

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