PubMed · 4146123
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R Vicent, J Matas. [Retainer joints].. https://pubmed.ncbi.nlm.nih.gov/4146123/
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PURPOSE: To examine the effect of welding method and heat treatment on the strength of laser-welded gold alloy with age-hardenability at intraoral temperature. METHODS: Cast gold alloy plates (0.5 x 3.0 x 20 mm3) were prepared and cut perpendicular to the 3.0 mm surface of the plate. After the cut halves were fixed in a jig, they were laser-welded using a Nd: YAG laser. Three laser pulses were applied from one side (single-welded) or both sides (double-welded) to weld the entire joint width of the specimens. Three different heat treatments were given the specimens: solution treatment at 700 degrees C for 5 minute (ST), aging at 250 degrees C for 15 minute after ST (HA), and aging at 37 degrees C for 3 day after ST (IA). As-cast specimens were also reserved. Uncut specimens served as non-welded control specimens. Tensile testing was conducted at a crosshead speed of 2 mm/minute and a gauge length of 10 mm. The breaking stress (Bs: MPa) was recorded, and the data (n = 5 per group) were statistically analyzed. RESULTS: In the control groups, the Bs values of the IA were not significantly different (P > 0.05) from those of the HA specimens. The laser-welded IA specimens showed significantly greater (P < 0.05) Bs values compared to the solution-treated and as-cast specimens. The double-welded specimens showed significantly greater Bs values compared to the single-welded specimens after any heat treatment.
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Limited space for extracoronal attachments is a serious complication in the design and fabrication of a precision attachment removable partial denture. A custom metal-ceramic housing joined to the partial framework with laser welding offers strength and improved esthetics while requiring minimal space. This article presents the technical aspects of custom housing construction.