Comparative analysis of two techniques for soldered cennectors

PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact [email protected] (M.Sc.D.)--Boston University. Henry M. Goldman School of Graduate Dentistry, 1991 (Prosthodontics)Bibliography : leaves 89-92.Soldering is the process of joining metallic objects with a compatible eutectic alloy (solder) that has a lower melting point than the parent metal. One of the prerequisites for soldering operations is the application of heat to the metal being readied for the procedure. Various heating methods are employed for this purpose. The aim of this soldering study was to compare and analyze gas torch as heat source to the infrared technique. Other evaluations were made for technique sensitivity, resultant flexure strength and microstructure of the soldered areas. Ney Oro B2, Ney Eclipse and Ney 76 were the alloys selected for this purpose. Sixty standardized plastic rods were invested and cast according to the manufacturer's recommendations for the three different alloys. The castings were retrieved, cleansed and then sectioned from their respective sprue buttons. Each rod was then checked for symmetry length and diameter. A mid-point for future bisection of the rods was registered. The rods were then invested for soldering and sectioned at the previously registered mid-point. The soldering was performed with the recommended fluxes and solders. Half of the specimens (10 of each alloy) were soldered using infrared heat. The remaining half (10) was soldered with gas torch flame. The rods were then divested, cleansed and refined for analyzation. They were tested for flexural strength using the Instron testing device. Maximum strength and break points were registered. The fractured specimens were analyzed using electron microscopy