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Zong X, Wang Y, Sun Y, Chen H. Femtosecond Laser for Cavity Preparation in Enamel and Dentin: Axial Wall Taper Related Factors. Photobiomodul Photomed Laser Surg 2022; 40:417-423. [DOI: 10.1089/photob.2021.0126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Xiao Zong
- Center of Digital Dentistry, Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, NHC Research Center of Engineering and Technology for Computerized Dentistry, Beijing, P.R. China
- Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Taiyuan, P.R. China
| | - Yong Wang
- Center of Digital Dentistry, Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, NHC Research Center of Engineering and Technology for Computerized Dentistry, Beijing, P.R. China
- Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Taiyuan, P.R. China
| | - Yuchun Sun
- Center of Digital Dentistry, Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, NHC Research Center of Engineering and Technology for Computerized Dentistry, Beijing, P.R. China
- Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Taiyuan, P.R. China
| | - Hu Chen
- Center of Digital Dentistry, Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, NHC Research Center of Engineering and Technology for Computerized Dentistry, Beijing, P.R. China
- Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Taiyuan, P.R. China
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Loganathan S, Santhanakrishnan S, Bathe R, Arunachalam M. Physiochemical characteristics: A robust tool to overcome teeth heterogeneity on predicting laser ablation profile. J Biomed Mater Res B Appl Biomater 2020; 109:486-495. [PMID: 32869958 DOI: 10.1002/jbm.b.34717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 08/08/2020] [Accepted: 08/18/2020] [Indexed: 11/11/2022]
Abstract
To avoid excessive tissue removal and collateral damage, the high-power density laser is apt for dental surgery also need to have high precision. For high-precision dental surgery with minimal tissue damage, the present work frames a method to predict laser ablation profile based on surface morphology and chemical composition of dentin. The surface morphology and chemical composition were studied on different dentin samples using scanning electron microscope (SEM) and Energy Dispersive X-ray Analysis (EDAX), respectively. The key laser ablation parameters (ω0 , Deff , and Fth ) were determined by laser irradiation study using 800 nm, Ti:Sapphire femtosecond laser at processing condition of 100 fs, 10 kHz and 10 mm/s. The dentin samples show a strong linear correlation between physiochemical characteristics and laser ablation parameters. The surface morphology exhibits a negative linear correlation with threshold fluence, whereas the converse is true for chemical composition. The laser ablation parameters of a random dentin sample are derived from the knowledge of linearity data. From the obtained laser ablation parameters, the complete theoretical ablation profile is constructed and validated with experimental ablation profile. Even though the surface morphology of dentin shows high linearity, the concentration of Ca and P can be used as the most feasible probe in clinical settings. Furthermore, the laser ablation rate and ablation efficiency are predicted by the method to optimize the laser processing condition for any specific teeth. The versatility of the method overcomes the problem of heterogeneity on various teeth and simplifies the method of finding optimal laser processing condition for immaculate laser surgery.
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Affiliation(s)
- Sarathkumar Loganathan
- Manufacturing Engineering Section, Department of Mechanical Engineering, Indian Institute of Technology, Chennai, India
| | | | - Ravi Bathe
- Centre for Laser Processing of Materials, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad, India
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Liang S, Lyu P, Yuan F. Method for Accurately Preparing Cavities on Cortical Bones Using Picosecond Laser. PHOTOBIOMODULATION PHOTOMEDICINE AND LASER SURGERY 2020; 38:301-307. [PMID: 32427550 DOI: 10.1089/photob.2019.4724] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Shanshan Liang
- Centre of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, China
- Research Centre of Engineering and Technology for Digital Dentistry of Ministry of Health, Beijing, China
- Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Peijun Lyu
- Centre of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, China
- Research Centre of Engineering and Technology for Digital Dentistry of Ministry of Health, Beijing, China
- Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Fusong Yuan
- Centre of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
- National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, China
- Research Centre of Engineering and Technology for Digital Dentistry of Ministry of Health, Beijing, China
- Beijing Key Laboratory of Digital Stomatology, Beijing, China
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Loganathan S, Santhanakrishnan S, Bathe R, Arunachalam M. Surface Processing: An Elegant Way to Enhance the Femtosecond Laser Ablation Rate and Ablation Efficiency on Human Teeth. Lasers Surg Med 2019; 51:797-807. [DOI: 10.1002/lsm.23105] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/05/2019] [Indexed: 01/22/2023]
Affiliation(s)
- Sarathkumar Loganathan
- Department of Mechanical Engineering, Manufacturing Engineering SectionIndian Institute of Technology MadrasChennai 600036 Tamil Nadu India
| | - Soundarapandian Santhanakrishnan
- Department of Mechanical Engineering, Manufacturing Engineering SectionIndian Institute of Technology MadrasChennai 600036 Tamil Nadu India
| | - Ravi Bathe
- International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI)Centre for Laser Processing of MaterialsHyderabad 500005 Telangana India
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Aljekhedab F, Zhang W, Haugen HK, Wohl GR, El-Desouki MM, Fang Q. Influence of environmental conditions in bovine bone ablation by ultrafast laser. JOURNAL OF BIOPHOTONICS 2019; 12:e201800293. [PMID: 30680962 DOI: 10.1002/jbio.201800293] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Revised: 01/22/2019] [Accepted: 01/22/2019] [Indexed: 06/09/2023]
Abstract
Ultrafast lasers are promising tools for surgical applications requiring precise tissue cutting. Shallow ablation depth and slow rate as well as collateral damage are common barriers limiting the use of laser in clinical applications. Localized cooling with water and/or air jet is known to reduce collateral thermal damage. We studied the influence of environmental conditions including air, compressed air flow, still water and water jet on ablation depth, ablation rate and surface morphology on bovine bone samples with an 800 nm femtosecond laser. At 15 J/cm2 , no thermal effect was observed by electron microscopy and Raman spectroscopy. The experimental results indicate that environmental conditions play a significant role in laser ablation. The deepest cavity and highest ablation rate were achieved under the compressed air flow condition, which is attributed to debris removal during the ablation process. The shallowest ablation depth and lowest ablation rates were associated with water flushing. For surface morphology, smooth surface and the absence of microcracks were observed under air flow conditions, while rougher surfaces and minor microcracks were observed under other conditions. These results suggest that ultrafast ablation of bone can be more efficient and with better surface qualities if assisted with blowing air jet.
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Affiliation(s)
- Fahad Aljekhedab
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada
- National Nanotechnology Center, King Abdulaziz City for Science and Technology (KACST), Riyadh, Saudi Arabia
| | - Wenbin Zhang
- Department of Engineering Physics, McMaster University, Hamilton, Ontario, Canada
- Department of Oral & Cranio-Maxillofacial Surgery, Shanghai 9th People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, National Clinical Research Center of Stomatology, Shanghai, China
| | - Harold K Haugen
- Department of Engineering Physics, McMaster University, Hamilton, Ontario, Canada
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada
| | - Gregory R Wohl
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada
- Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, Canada
| | - Munir M El-Desouki
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada
| | - Qiyin Fang
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada
- Department of Engineering Physics, McMaster University, Hamilton, Ontario, Canada
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Seifalinezhad A, Bahreini M, Hassani Matin MM, Tavassoli SH. Feasibility Study on Discrimination of Neo-plastic and Non-Neoplastic Gastric Tissues Using Spark Discharge Assisted Laser Induced Breakdown Spectroscopy. J Lasers Med Sci 2018; 10:64-69. [PMID: 31360371 DOI: 10.15171/jlms.2019.10] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Introduction: The present work is a novel in vitro study that evaluated the possibility of diagnosing neoplastic from nonneoplastic gastric tissues using spark discharge assisted laser induced breakdown spectroscopy (SD-LIBS) method. Methods: In these experiments, the low energy laser pulses ablated a tiny amount of tissue surface leading to plasma formation. Then, a spark discharge was applied to plasma in order to intensify the plasma radiation. Light emission from plasma was recorded as spectra which were analyzed. Gastric tissues of 5 people were studied through this method. Results: The SD-LIBS technique had the potential to discriminate normal and cancerous tissues based on the significant differences in the intensities of some particular elements. The comparison of normalized calcium (Ca) and magnesium (Mg) peaks of neoplastic and nonneoplastic gastric tissues could be viewed as a practical measure for tissue discrimination since Ca and Mg peaks in spectra of neoplastic were noticeably higher than nonneoplastic. Conclusion: Considering the identification of gastric cancer, the applied method in these experiments seems quite fast, noninvasive and cost-effective with respect to other conventional methods. The significant increment of specific Ca and Mg lines of neoplastic gastric tissues in comparison to the nonneoplastic ones can be considered as valuable information that might bring about tissue classification. The number of samples in this work, however, was not sufficient for a decisive conclusion and further researches is needed to generalize this idea.
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Affiliation(s)
- Aida Seifalinezhad
- Laser and Plasma Research Institute, Shahid Beheshti University, G. C., Tehran, Iran
| | - Maryam Bahreini
- Laser Application in Medical Sciences Research Center (LAMSRC), Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Hazrat-e Masoumeh University, Qom, Iran
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Prediction of femtosecond laser ablation profile on human teeth. Lasers Med Sci 2018; 34:693-701. [DOI: 10.1007/s10103-018-2644-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 09/17/2018] [Indexed: 11/29/2022]
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Domke M, Wick S, Laible M, Rapp S, Huber HP, Sroka R. Ultrafast dynamics of hard tissue ablation using femtosecond-lasers. JOURNAL OF BIOPHOTONICS 2018; 11:e201700373. [PMID: 29845754 DOI: 10.1002/jbio.201700373] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Accepted: 05/28/2018] [Indexed: 06/08/2023]
Abstract
Several studies on hard tissue laser ablation demonstrated that ultrafast lasers enable precise material removal without thermal side effects. Although the principle ablation mechanisms have been thoroughly investigated, there are still open questions regarding the influence of material properties on transient dynamics. In this investigation, we applied pump-probe microscopy to record ablation dynamics of biomaterials with different tensile strengths (dentin, chicken bone, gallstone and kidney stones) at delay times between 1 picosecond and 10 microseconds. Transient reflectivity changes, pressure and shock wave velocities and elastic constants were determined. The result revealed that absorption and excitation show the typical well-known transient behavior of dielectric materials. We observed for all samples a photomechanical laser ablation process, where ultrafast expansion of the excited volume generates pressure waves leading to fragmentation around the excited region. In addition, we identified tensile-strength-related differences in the size of ablated craters and ejected particles. The elastic constants derived were in agreement with literature values. In conclusion, pressure-wave-assisted material removal seems to be a general mechanism for hard tissue ablation with ultrafast lasers. This photomechanical process increases ablation efficiency and removes heated material, thus ultrafast laser ablation is of interest for clinical application where heating of the tissue must be avoided.
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Affiliation(s)
- Matthias Domke
- Josef Ressel Center for Material Processing with Ultrashort Pulsed Lasers, Research Center for Microtechnology, Vorarlberg University of Applied Sciences, Dornbirn, Austria
| | - Sebastian Wick
- Lasercenter of Munich University of Applied Sciences, Munich, Germany
| | - Maike Laible
- LIFE-Zentrum, Laser-Forschungslabor, Hospital of University of Munich, Munich, Germany
| | - Stephan Rapp
- Lasercenter of Munich University of Applied Sciences, Munich, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Heinz P Huber
- Lasercenter of Munich University of Applied Sciences, Munich, Germany
| | - Ronald Sroka
- LIFE-Zentrum, Laser-Forschungslabor, Hospital of University of Munich, Munich, Germany
- Department of Urology, Hospital of University of Munich, Munich, Germany
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Moura SK, Lopes CC, Trevelin LT, Matos AB, Martinez ÍVL, Estevam M, Bussadori SK. Effects of different treatments on chemical and morphological features of eroded dentin. Lasers Med Sci 2018; 33:1441-1446. [PMID: 29582261 DOI: 10.1007/s10103-018-2482-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 03/09/2018] [Indexed: 10/17/2022]
Abstract
To evaluate the treatment of eroded dentin (Sensodyne Repair & Protect™, Er:YAG laser and combinations). The occlusal surfaces of 25 third molars were sectioned 1.5 mm in thickness. After an erosion cycle (5 min in demineralizing solution + 3 h in remineralizing solution; six cycles a day for 8 days), the samples were divided into five groups (n = 5): (E) erosion - control; (ES) erosion + Sensodyne Repair & Protect (NovaMin); (EL) erosion + Er:YAG laser (40 mJ, 10 Hz, 0.4 W, 50 μs, 3.1 J/cm2, 63 W/cm2); (ELS) erosion + Er:YAG laser + Sensodyne; and (ESL) erosion + Sensodyne + Er:YAG laser. Following storage in ultrapure water (37 °C/14 days), the Ca/P ratio was evaluated by EDXRF and the morphology surfaces examined in SEM. The percentage of exposed dentin tubules was calculated. One-way analysis of variance and Tukey's test at 5% were used to treat the data. The Ca/P ratio was higher in E and ES groups. More exposed dentin tubules were found in E group and less exposed tubules were found in the ES group (p < 0.0001). When the toothpaste and laser were combined, the number of occluded dentin tubules was higher when laser was performed first (ELS). A positive effect was found when the laser and toothpaste were combined.
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Affiliation(s)
- Sandra Kiss Moura
- Department of Dentistry, University North of Parana (UNOPAR), Rua Marselha 183, Londrina, 86010141, Brazil.
- Department of Biophotonics Applied to Health Sciences, Nove de Julho University (UNINOVE), Rua Vergueiro 245, São Paulo, 01504000, Brazil.
| | - Carolina Cury Lopes
- Department of Dentistry, University North of Parana (UNOPAR), Rua Marselha 183, Londrina, 86010141, Brazil
| | - Livia Tosi Trevelin
- Department of Dentistry, University of São Paulo (FOUSP), Av Prof Lineu Prestes 2227, São Paulo, 05508000, Brazil
| | - Adriana Bona Matos
- Department of Dentistry, University of São Paulo (FOUSP), Av Prof Lineu Prestes 2227, São Paulo, 05508000, Brazil
| | | | - Marcelo Estevam
- LPIS Health Research and Innovation Laboratory, Federal Institute of Parana (IFPR), Av João XXIII 600, Londrina, 86060370, Brazil
| | - Sandra Kalil Bussadori
- Department of Biophotonics Applied to Health Sciences, Nove de Julho University (UNINOVE), Rua Vergueiro 245, São Paulo, 01504000, Brazil
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