scholarly journals Di-Silicate Dental Ceramic Surface Preparation by 1070 nm Fiber Laser: Thermal and Ultrastructural Analysis

2017 ◽  
Author(s):  
Carlo Fornaini ◽  
Federica Poli ◽  
Elisabetta Merigo ◽  
Nathalie Brulat-Bouchard ◽  
Ahmed El Gamal ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Peak Power ◽  
Surface Preparation ◽  
In Vitro Study ◽  
Optical Microscope ◽  
Ceramic Surface ◽  
Dental Ceramics ◽  
Total Energy Density ◽  
Pulsed Fiber Laser

Background: Lithium di-silicate dental ceramics bonding, realized by using different resins, is strictly dependent on micro-mechanical retention and chemical adhesion. The aim of this in vitro study was to investigate the capability of a 1070 nm fiber laser for their surface treatment. Methods: Samples were irradiated by a pulsed fiber laser at 1070 nm with different parameters (Peak Power from 5 kW to 5 kW, RR 20 kHz, speed from 10 to 50 mm/s, total Energy Density from 1.3 to 27 kW/cm2) and the thermal elevation during the experiment was recorded by a Fiber Bragg Grating (FBG) temperature sensor. Subsequently, the surface modifications were analysed by optical microscope, Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Spectroscopy (EDS). Results: With a Peak Power of 5 kW, RR of 20 kHz and speed of 50 mm/s, the microscopic observation of the irradiated surface showed increased roughness with small areas of melting and carbonization. EDS analysis revealed that, with these parameters, there are no evident differences between laser-processed samples and controls. Thermal elevation during laser irradiation ranged between 5 °C and 9 °C. Conclusions: 1070 nm fiber laser can be considered as a good device to increase the adhesion of Lithium di-silicate ceramics.

scholarly journals Laser Use in Creating Orthodontic Adhesion to Ceramic Surfaces

2021 ◽  
Vol 11 (6) ◽  
pp. 2512
Author(s):  
Anca Labunet ◽  
Andreea Kui ◽  
Sorina Sava
Keyword(s):  
Hydrofluoric Acid ◽  
Surface Preparation ◽  
Good Alternative ◽  
Ceramic Surface ◽  
Ti:Sapphire Lasers ◽  
Ceramic Surfaces ◽  
Golden Standard ◽  
Laser Systems ◽  
Ceramic Crowns

Orthodontists must sometimes bond attachments to ceramic crowns, by using one of the surface preparations available, such as sandblasting or acid etching with hydrofluoric acid. Research shows that different laser systems may also be used for this purpose. The aim of this review is to determine which laser type and modality of use is the most effective in increasing shear bond strength of brackets bonded to ceramic surfaces. Two independent researchers studied the current literature 1990–2018 and selected original articles focusing on in vitro research on laser use for ceramic surface preparation for bonding metallic or ceramic attachments. Twelve articles have met the criteria and have been thoroughly revised, focusing on 2 fractional, Nd:Yag, Er:Yag, femtosecond and Ti:Sapphire lasers. There is little difference shown by the current studies between ceramic types and information on orthodontic bonding to non-feldspathic ceramics is scarce. Femtosecond laser is a good alternative to classical surface preparation with hydrofluoric acid. Nd:Yag laser is more suitable for surface preparation of ceramics than different types of Er:Yag lasers. Difference in laser power may achieve different results, but the golden standard for lasers use has not been found. Laser usage does not obtain the same results as hydrofluoric acid and cannot, so far, eliminate its application.

Research on L-PPM Modulation Rate of Pulse Fiber Lasers

2014 ◽  
Vol 926-930 ◽  
pp. 1787-1790
Author(s):  
Zi Qiang Hao ◽  
Hong Zuo Li ◽  
Xin Ren
Keyword(s):  
Fiber Laser ◽  
Peak Power ◽  
Transmission Rate ◽  
Repetition Frequency ◽  
High Rate ◽  
High Peak Power ◽  
Device Processing ◽  
Rate Transmission ◽  
Modulation Rate ◽  
Pulsed Fiber Laser

Compared with continuous laser, pulsed fiber laser has the advantages of high peak power, which is widely used in device processing, military defense and other areas. As the repetition frequency of pulsed fiber laser is low and therefore it cannot realize high rate transmission, this paper does the research on L-PPM modulation of pulsed fiber laser to find a method of effectively improving the modulation rate of pulsed fiber laser. Experimental results show that the L-PPM modulation can improve the transmission rate of the pulsed fiber laser whose repetition frequency is 200K to 1.387Mbps. The research results are useful for the application of pulsed fiber laser in communication.

Linearly polarized 100-kW-Peak-power pulsed fiber laser with a novel master oscillator

2010 ◽  
Vol 17 (2) ◽  
pp. 50-53 ◽  
Author(s):  
Masafumi Baba ◽  
Takehiko Fujishiro ◽  
Shigeru Yamaguchi ◽  
Kazuyoku Tei ◽  
Makoto Yoshida ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Peak Power ◽  
Master Oscillator ◽  
Linearly Polarized ◽  
Pulsed Fiber Laser

Influence of prophylaxis on the microleakage of sealants: in vitro study

2002 ◽  
Vol 26 (4) ◽  
pp. 371-375 ◽  
Author(s):  
Ana Beatriz Alonso Chevitarese ◽  
Orlando Chevitarese ◽  
Ivete Pomarico Ribeiro de Souza ◽  
Roberto Braga de Carvalho Vianna
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
In Vitro Study ◽  
Optical Microscope ◽  
Vitro Study ◽  
Significant Difference ◽  
Group A ◽  
Group B ◽  
Scanning Electron

The aim of this study was to evaluate the influence of prophylaxis on the sealants microleakage in 30 premolars divided into: Group A, Group B and Group C. The teeth were analyzed using the optical microscope (OM) and at scanning electron microscope (SEM). There was a statitical significant difference among the groups regarding the presence of microleakage, but not with the presence of tags.

scholarly journals Evaluating The Fracture Toughness and Flexural Strength of Pressable Dental Ceramics: An In Vitro Study

2013 ◽  
Vol 14 (4) ◽  
pp. 358-362 ◽  
Author(s):  
Ravi Gurram ◽  
C. H. Vamsi Krishna ◽  
K. Mahendranadh Reddy ◽  
G. V. K. Mohan Reddy ◽  
Y. Mahadev Shastry
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
In Vitro Study ◽  
Vitro Study ◽  
Dental Ceramics
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