[en] Background. Laser welding was first reported in 1967 and for many years it has been used in dental laboratories with several advantages versus the conventional technique. Authors described, in previous works, the possibility of using also chair-side Nd : YAG laser device (Fotona Fidelis III, λ = 1064 nm) for welding metallic parts of prosthetic appliances directly in the dental office, extra- and also intra-orally. Syncristallisation is a soldering technique based on the creation of an electric arc between two electrodes and used to connect implants to bars intra-orally. Aim. The aim of this study was to compare two different laser welding devices with a soldering machine, all of these used in prosthetic dentistry. Material and Methods. In-lab Nd : YAG laser welding (group A = 12 samples), chair-side Nd : YAG laser welding (group B = 12 samples), and electrowelder (group C = 12 samples) were used. The tests were performed on 36 CrCoMo plates and the analysis consisted in evaluation, by microscopic observation, of the number of fissures in welded areas of groups A and B and in measurement of the welding strength in all the groups. The results were statistically analysed by means of one-way ANOVA and Tukey-Kramer multiple comparison tests. Results. The means and standard deviations for the number of fissures in welded areas were 8.12 ± 2.59 for group A and 5.20 ± 1.38 for group B. The difference was statistical significant (P = 0.0023 at the level 95%). On the other hand, the means and standard deviations for the traction tests were 1185.50 ± 288.56 N for group A, 896.41 ± 120.84 N for group B, and 283.58 ± 84.98 N for group C. The difference was statistical significant (P = 0.01 at the level 95%). Conclusion. The joint obtained by welding devices had a significant higher strength compared with that obtained by the electrowelder, and the comparison between the two laser devices used demonstrated that the chair-side Nd : YAG, even giving a lower strength to the joints, produced the lowest number of fissures in the welded area.
Disciplines :
Dentistry & oral medicine
Author, co-author :
Fornaini, C; Department of Dental Sciences, Faculty of Medicine, University of Liège, 4000 Liège, Belgium
Merigo, E; Oral Medicine and Laser-Assisted Surgery Unit, Dental School, University of Parma, 12-143121 Parma, Italy
Vescovi, P; Oral Medicine and Laser-Assisted Surgery Unit, Dental School, University of Parma, 12-143121 Parma, Italy
Meleti, M; Oral Medicine and Laser-Assisted Surgery Unit, Dental School, University of Parma, 12-143121 Parma, Italy
Namour, Samir ; Université de Liège - ULiège > Département des sciences dentaires
Language :
English
Title :
Laser welding and syncristallization techniques comparison: in vitro study.
Gordon T. E., Smith D. L., Laser welding of prosthesesan initial report Quintessence international 1972 3 3 63 64
Fusayama T., Wakumoto S., Hosoda H., Accuracy of fixed partial dentures made by various soldering techniques and one-piece casting The Journal of Prosthetic Dentistry 1964 14 2 334 342
Van Benthem H., Advantages of laser welding compared to conventional joining Die Quintessenz der Zahntechnik 1991 17 9 1178 1193
Bertrand C., Le Petitcorps Y., Albingre L., Dupuis V., The laser welding technique applied to the non precious dental alloys procedure and results British Dental Journal 2001 190 5 255 257 (Pubitemid 33755333)
Dobberstein H., Dobberstein H., Orlick H., Zuhrt R., The welding of cobalt-chromium, nickel-chromium and silver-palladium alloys using a solid-state laser Zahn-, Mund-, und Kieferheilkunde mit Zentralblatt 1990 78 3 259 261
Fornaini C., Bertrand C., Bonanini M., Rocca J. P., Nammour S., Welding in the dental office by fiber-delivered laser: a new technique Photomedicine and Laser Surgery 2009 27 3 417 423
Degidi M., Gehrke P., Spanel A., Piattelli A., Syncrystallization: a technique for temporization of immediately loaded implants with metal-reinforced acrylic resin restorations Clinical Implant Dentistry and Related Research 2006 8 3 123 134 (Pubitemid 44432468)
Hruska A. R., Intraoral welding of pure titanium Quintessence International 1987 18 10 683 688
Dawes C., Laser Welding 1992 Cambridge, UK Abington Publishing, The Welding Institute
Ream S. L., Laser Materials Processing 1988 New York, NY, USA IFS Publications, Springer, The Laser Institute of America
Baba N., Watanabe I., Liu J., Atsuta M., Mechanical strength of laser-welded cobalt-chromium alloy Journal of Biomedical Materials Research B 2004 69 2 121 124 (Pubitemid 38647172)
Katayama S., Kohsaka S., Mizutani M., Nishizawa K., Matsunawa A., Proceedings of the Laser Materials Processing Conference (ICALEO '93) October 1993 Laser Institute of America 487
Iwasaki K., Ohkawa S., Uo M., Akasaka T., Watari F., Laser welding of titanium and dental precious alloys Materials Transactions 2004 45 4 1140 1146
Fornaini C., Bertrand C., Rocca J. P., Mahler P., Bonanini M., Vescovi P., Merigo E., Nammour S., Intra-oral laser welding: an in vitro evaluation of thermal increase Lasers in Medical Science 2010 25 4 473 477
Mondani P. L., Mondani P. M., The Pierluigi Mondani intraoral electric solder. Principles of development and explanation of the solder using syncrystallization Rivista di Odontostomatologia e Implantoprotesi 1982 4 28 32
Gehrke P., The syncrystallization technique: expediting rigid splinting of immediately loaded implants Dental Implantology 2006 17 3 17 23
Dal Carlo L., Las numerosas aplicaciones de la soldadora intra-oral de Mondani: 17 anos de experiencia clinica Revista Espanola Odontoestomatologica de Implantes 2006 14 1 24 34
Vannini F., Nardone M., Emerging transmucosal single-stage implants with electro-welding and immediate loading Annali di Stomatologia 2004 3
Fanali S., Vannini F., Two-stage implants connected using an intra-oral welding machine Doctor Os 2007 18 9, article 8
Vannini F., Nardone M., Implantologia ad aghi nei settori posteriori mandibolari atrofici: passato o attualit? Chirurgia Orale 2007 2
