Biomaterial Database

Laser-welded vs soldered nonprecious alloy dental bridges: a comparative study. 1984

H Apotheker, and I Nishimura, and C Seerattan

The high cost of gold alloy has caused the dental profession to begin substituting nonprecious alloy for the framework in porcelain fused to metal bridges. Especially in long-span bridges it may be advantageous to make multiple castings and then join them for a better fit. As opposed to the highly successful soldering of gold, soldered nonprecious alloy bridges have a great failure rate in the mouth. Removal of and remaking of the bridges is thus the result. This study compares nonprecious units that have been laser-welded with those conventionally soldered. Seven identical bridges of three units were cast in a popular alloy composed of 74-78% nickel, 12-15% chromium, 4-6% molybdenum, and 1.8% maximum beryllium. One served as a control, while the remaining six were all cut in the same place. Of these, three were soldered with a gas oxygen torch. The other three were welded with a Nd-YAG laser. Better and stronger joints unlikely to fracture in the mouth were found with the laser-welded specimen.

UI	MeSH Term	Description	Entries
D007834	Lasers	An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the infrared, visible, ultraviolet, or X-ray regions of the spectrum.	Masers,Continuous Wave Lasers,Pulsed Lasers,Q-Switched Lasers,Continuous Wave Laser,Laser,Laser, Continuous Wave,Laser, Pulsed,Laser, Q-Switched,Lasers, Continuous Wave,Lasers, Pulsed,Lasers, Q-Switched,Maser,Pulsed Laser,Q Switched Lasers,Q-Switched Laser
D002858	Chromium Alloys	Specific alloys not less than 85% chromium and nickel or cobalt, with traces of either nickel or cobalt, molybdenum, and other substances. They are used in partial dentures, orthopedic implants, etc.	Chromium-Cobalt Alloys,Chromium-Nickel Alloys,Cobalt-Chromium Alloys,Nickel-Chromium Alloys,Alloys, Chromium,Alloys, Chromium-Cobalt,Alloys, Chromium-Nickel,Alloys, Cobalt-Chromium,Alloys, Nickel-Chromium,Chromium Cobalt Alloys,Chromium Nickel Alloys,Cobalt Chromium Alloys,Nickel Chromium Alloys
D003722	Dental Alloys	A mixture of metallic elements or compounds with other metallic or metalloid elements in varying proportions for use in restorative or prosthetic dentistry.	Alloy, Dental,Alloys, Dental,Dental Alloy
D003781	Denture Retention	The retention of a denture in place by design, device, or adhesion.	Denture Stability,Retention, Denture,Stability, Denture
D003829	Denture, Partial	A denture replacing one or more (but not all) natural teeth. It is supported and retained by underlying tissue and some or all of the remaining teeth.	Dental Bridgework,Bridgework, Dental,Bridgeworks, Dental,Dental Bridgeworks,Dentures, Partial,Partial Denture,Partial Dentures
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012994	Dental Soldering	The joining of pieces of metal through the use of an alloy which has a lower melting point, usually at least 100 degrees Celsius below the fusion temperature of the parts being soldered. In dentistry, soldering is used for joining components of a dental appliance, as in assembling a bridge, joining metals to orthodontic bands, or adding to the bulk of certain structures, such as the establishment of proper contact areas on inlays and crowns with adjacent teeth. (Illustrated Dictionary of Dentistry, 1982)	Soldering, Dental
D014896	Welding	Joining metal pieces or parts together by melting the adjoining surfaces with heat, using a heat source such as a blowtorch or electric arc. The melted surfaces are then pressed together by hammering.