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KMID : 0370819930080010017
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Yonsei Journal Dental Science
1993 Volume.8 No. 1 p.17 ~ p.36
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Property changes of orthodonitic wire and soldered joint according to dental silver solders and soldering methods
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Abstract
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To investigate and compare the softening distance, shear-tension fracture load and microstructure of soldered joints according to the different dental silver solders and soldering methods, this study has been done on the 4 kinds of dental silver
solders(DT, OM, RM, UT: solders manufactured by Dentaurum, Ormco, RMO, and Unitek Co.) using torch soldering, electric soldering and electronichydro-solderer soldering. Also compositions and melting ranges f the 4 kinds of dental silver solders
were
investigated.
@ES Results were as follows:
@EN 1. No significant difference was found in softening distance among the 4 kinds of dental silver solders. Torch soldering showed wider solftening distance than electric soldering or electronichydro-solderer soldering.
2. Using torch soldering, UT showed stronger shear-tension fracture load than DT, OM and RM, but no significant difference in shear-tension fracture load among the 4 kinds of dental silver solders using electric soldering and
electronic-hydro-solderer
soldering.
3. OM showed greater shear-tension fracture load using torch soldering than electronic-hydro-solderer soldering and UT showed greater shear-tension fracture load using torch soldering and electronichydro-solderer soldering than electric
soldering.
But
no significant difference was found in sheartension fracture load of DT and RM among the methods.
4. As a result of microscopic examination, well defined boundarys between the stainless steel wires and the dental silver solders were observed. Also precipitate and void were observed in the dental silver solders. Microstructures of soldered
joints
were divided into 4 different types according to the loss of original fibrous structure and appearance of equiaxed crystals.
5. Atomic diffusion was observed at the interface between the stainless steel wire and dental silver solder.
As a results of this study, none of the soldering methods had all qualities experimented. But it was considered that electronic-hydro-solderer soldering had the conditions for clinically acceptable soldered joint.
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KEYWORD
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