Microplasma welding is a less expensive alternative to
laser welding in dental technology. The aim of the study was to
highlight discontinuities present in the microplasma welded joints of
dental base metal alloys by visual analysis. Five base metal alloys
designated for fixed prostheses manufacture were selected for the
experiments. Using these plates, preliminary tests were conducted by
microplasma welding in butt joint configuration, without filler
material, bilaterally and with filler material, proper for each base
metal. Macroscopic visual inspection was performed to assess
carefully the irregularities in the welds. Electron microscopy allowed
detection of discontinuities that are not visible to the eye and
revealing details regarding location, trajectory, morphology and size
of discontinuities. Supplementing visual control with microscopic
analysis allows to detect small discontinuities, which escapes the
macroscopic control and to make a detailed study of the weld.
 L. Jeffus, Welding: Principles and applications, 6th edition. Thomson
Delmar Learning, New York, 2008.
 I. Watanabe, J. Liu, M. Atsuta, "Effects of heat treatments on mechanical
strength of laser-welded equi-atomic AuCu-6at%Ga alloy" in J Dent
Res, 2001 Sep;80(9):1813-7.
 N. Baba, I.Watanabe, "Penetration depth into dental casting alloys by
Nd:YAG laser" in J Biomed Mater Res B Appl Biomater, 2005,
 M.O. Neumann, J. Lindigkeit, "Mechanische Festigkeit von
geschweißten EMF-Legierungen" in Quintessenz Zahntech, 2005,
 A. Reichert, "Untersuchung der Schweißnahtqualit├ñten von Laser und
Phaser" in Quintessenz Zahntech, 2005, 31(3):264-79.
 H.J. Burkhardt, "Ein wirtschaftlicher Weg mit Erfolgschancen -
Schweißen mit dem CeHa Phaser MX1" in Quintessenz Zahntech, 2005,