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Fit of implant frameworks fabricated by one-piece casting, laser welding, soldering, and electric discharge machining 일체주조법, 레이저용접법, 납착법, 방전가공법에 의해 제작된 임플란트 보철물의 적합도에 관한 연구
Young-Hoon Seol, Chang-Mo Jeong, Young-Chan Jeon, Sung-Won Kang
설영훈, 정창모, 전영찬, 강성원

The purpose of this study was to measure and compare the strains produced by screw-tightening
implant frameworks fabricated by five different fabrication methods; (1) one-piece cast using plas-
tic sleeve, (2) one-piece cast using gold cylinder, (3) laser welding, (4) soldering, and (5) elec-
trical discharge machining, and also to measure and compare the strains produced when the order
of screw tightening was changed.
A research model incorporating eighteen strain gages was made to measure the fit of implant
frameworks in three dimensions. Three implants aligned in an arc were fixed on the top ends of
the L-shape aluminum bars of the research model, and standard abutments were joined to the
implants with abutment screws. Five types of implant framework were placed on the abutments
and screwed by a torque wrench using 10 Ncm.
Under the conditions of this study, the following conclusions were drawn:
1. The electrical discharge machining group showed the smallest magnitude of strain, followed
by the soldering group, the laser welding group, the one-piece cast group  using gold cylin-
der, and the one-piece cast group using plastic sleeve. However, among the magnitude of strain
for the remaining groups except the electrical discharge machining group, there were not sig-
nificant differences.
2. When the order of screw tightening was changed, there were not significant differences in the
magnitude of strain.
3. In comparison with the electrical discharge machining group, the laser welding group and the
one-piece cast groups showed greater horizontal distortion and the soldering group showed
greater horizontal and vertical distortion.

* Keywords: One-piece casting, Laser welding, Soldering, Electrical discharge machining, Distortion

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