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Intraoral laser welding: ultrastructural and mechanical analysis to compare laboratory laser and dental laser.

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Title: Intraoral laser welding: ultrastructural and mechanical analysis to compare laboratory laser and dental laser.
Authors: Fornaini, Carlo carlo@fornainident.it, Passaretti, Francesca1, Villa, Elena1, Rocca, Jean-Paul2, Merigo, Elisabetta3, Vescovi, Paolo3, Meleti, Marco3, Manfredi, Maddalena3, Nammour, Samir4
Source: Lasers in Medical Science. Jul2011, Vol. 26 Issue 4, p415-420. 6p.
Subjects: Laser welding, Lasers in dentistry, Ultrastructure (Biology), Dental implants, Scanning electron microscopy, Nd-YAG lasers, X-ray spectroscopy, Oral surgery, Laser therapy, Metallurgy equipment, Dental technology, Dental metallurgy, Comparative studies, Dental equipment, Dentistry, Research methodology, Medical cooperation, Research, Evaluation research, Medical equipment reliability, Equipment & supplies
Abstract: The Nd:YAG laser has been used since 1970 in dental laboratories to weld metals on dental prostheses. Recently in several clinical cases, we have suggested that the Nd:YAG laser device commonly utilized in the dental office could be used to repair broken fixed, removable and orthodontic prostheses and to weld metals directly in the mouth. The aim of this work was to evaluate, using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and dynamic mechanical analysis (DMA), the quality of the weld and its mechanical strength, comparing a device normally used in dental laboratory and a device normally used in the dental office for oral surgery, the same as that described for intraoral welding. Metal plates of a Co-Cr-Mo dental alloy and steel orthodontic wires were subjected to four welding procedures: welding without filler metal using the laboratory laser, welding with filler metal using the laboratory laser, welding without filler metal using the office laser, and welding with filler metal using the office laser. The welded materials were then analysed by SEM, EDS and DMA. SEM analysis did not show significant differences between the samples although the plates welded using the office laser without filler metal showed a greater number of fissures than the other samples. EDS microanalysis of the welding zone showed a homogeneous composition of the metals. Mechanical tests showed similar elastic behaviours of the samples, with minimal differences between the samples welded with the two devices. No wire broke even under the maximum force applied by the analyser. This study seems to demonstrate that the welds produced using the office Nd:YAG laser device and the laboratory Nd:YAG laser device, as analysed by SEM, EDS and DMA, showed minimal and nonsignificant differences, although these findings need to be confirmed using a greater number of samples. [ABSTRACT FROM AUTHOR]
Copyright of Lasers in Medical Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Intraoral laser welding: ultrastructural and mechanical analysis to compare laboratory laser and dental laser.
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  Data: <searchLink fieldCode="AR" term="%22Fornaini%2C+Carlo%22">Fornaini, Carlo</searchLink><i> carlo@fornainident.it</i><br /><searchLink fieldCode="AR" term="%22Passaretti%2C+Francesca%22">Passaretti, Francesca</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Villa%2C+Elena%22">Villa, Elena</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rocca%2C+Jean-Paul%22">Rocca, Jean-Paul</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Merigo%2C+Elisabetta%22">Merigo, Elisabetta</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Vescovi%2C+Paolo%22">Vescovi, Paolo</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Meleti%2C+Marco%22">Meleti, Marco</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Manfredi%2C+Maddalena%22">Manfredi, Maddalena</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Nammour%2C+Samir%22">Nammour, Samir</searchLink><relatesTo>4</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Lasers+in+Medical+Science%22">Lasers in Medical Science</searchLink>. Jul2011, Vol. 26 Issue 4, p415-420. 6p.
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  Label: Abstract
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  Data: The Nd:YAG laser has been used since 1970 in dental laboratories to weld metals on dental prostheses. Recently in several clinical cases, we have suggested that the Nd:YAG laser device commonly utilized in the dental office could be used to repair broken fixed, removable and orthodontic prostheses and to weld metals directly in the mouth. The aim of this work was to evaluate, using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and dynamic mechanical analysis (DMA), the quality of the weld and its mechanical strength, comparing a device normally used in dental laboratory and a device normally used in the dental office for oral surgery, the same as that described for intraoral welding. Metal plates of a Co-Cr-Mo dental alloy and steel orthodontic wires were subjected to four welding procedures: welding without filler metal using the laboratory laser, welding with filler metal using the laboratory laser, welding without filler metal using the office laser, and welding with filler metal using the office laser. The welded materials were then analysed by SEM, EDS and DMA. SEM analysis did not show significant differences between the samples although the plates welded using the office laser without filler metal showed a greater number of fissures than the other samples. EDS microanalysis of the welding zone showed a homogeneous composition of the metals. Mechanical tests showed similar elastic behaviours of the samples, with minimal differences between the samples welded with the two devices. No wire broke even under the maximum force applied by the analyser. This study seems to demonstrate that the welds produced using the office Nd:YAG laser device and the laboratory Nd:YAG laser device, as analysed by SEM, EDS and DMA, showed minimal and nonsignificant differences, although these findings need to be confirmed using a greater number of samples. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Lasers in Medical Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Laser welding
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      – SubjectFull: Ultrastructure (Biology)
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