Microstructure, mechanical performance and corrosion properties of base metal solder joints

Abstract

Laser fusion, which is a recent introduction to the field of prosthodontics, produces joints which have properties between those of one-piece casting and the gas oxygen torch soldering.

A Comparison of Two Soldering Techniques on the Misfit of Bar‐Retained Implant‐Supported Overdentures

“…More research with firm scientific evidence is required to evaluate changes in the implant/bone interface and prosthetic complications associated with correlations between framework misfit and stresses on peri‐implant bone. On the other hand, the soldered joints obtained using a torch have higher porousness, higher tendency to corrosion, and less resistance than the laser‐fused and one‐piece cast . This finding is important and, to a certain extent, contraindicates the use of the torch‐soldering technique because there is a corrosion process when the bars are in the mouth, and corrosion, together with corrosion fatigue, are key factors in the onset of the failure process .…”

“…On the other hand, the soldered joints obtained using a torch have higher porousness, higher tendency to corrosion, and less resistance than the laserfused and one-piece cast. 55 This finding is important and, to a certain extent, contraindicates the use of the torch-soldering technique because there is a corrosion process when the bars are in the mouth, and corrosion, together with corrosion fatigue, are key factors in the onset of the failure process. 56 In any case, and according to our data, it is inadvisable to use the torch or ceramic furnace soldering techniques as methods to achieve passive fit, and if a choice between these two techniques must be made, the ceramic furnace soldering technique results in lower misfit values than the torch-soldering technique.…”