Analysis of titanium infrared soldered connectors
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In this investigation, the solder connectors to be tested were designed according to ADA specification No. 14. Twenty-five specimens were fabricated for each group. There were 150 specimens as follow: Group I: One piece casting of titanium. Group II: Infrared soldered connectors of titanium. Group III: One piece castings of titanium subjected to porcelain firing procedures. Group IV: Infrared soldered connectors of titanium subjected to porcelain firing procedures. Group V: One piece casting of Ni-Cr subjected to porcelain firing procedures. Group VI: Infrared soldered connectors of Ni-Cr alloys subjected to porcelain firing procedures. All cast and soldered specimens were examined radiographica11y before ultimate tensile strength tests. Titanium specimens were soldered with the RS-1 Infrared Soldering Apparatus (J. Morita Co., Osaka, Japan), and Ni-Cr specimens were soldered in a Ney infrared soldering apparatus (J.M. Ney Co., Bloomfield, CT). After the tensile test, the fractured surface of each specimen was examined by SEM and EDXA. Five specimens in each group which had not been subjected to the tensile test were mounted in epoxy resin and longitudinally ground, polished and etched. The soldered connectors of each specimen were examined and photographed by using a metallurgical microscope and EDXA. In the ultimate tensile strength and percentage elongation tests, solid and soldered specimens were significantly different (p [less than] 0.01). There were about 23 micron and 50 micron diffusion zones found in titanium and Ni-Cr soldered specimens respectively. However, titanium soldered specimens yielded more reliable and consistent soldered connector than Ni-Cr.
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@example.com.Thesis (D.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1994 (Prosthodontics)Includes bibliographical references (leaves 155-171)
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