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NiO/camphene 슬러리의 동결건조 및 수소환원 공정에 의한 Ni 다공체 제조
정재헌,오승탁,현창용,Jeong, Jae-Hun,Oh, Sung-Tag,Hyun, Chang-Yong 한국분말재료학회 (*구 분말야금학회) 2019 한국분말재료학회지 (KPMI) Vol.26 No.1
In this study, freeze drying of a porous Ni with unidirectionally aligned pore channels is accomplished by using a NiO powder and camphene. Camphene slurries with NiO content of 5 and 10 vol% are prepared by mixing them with a small amount of dispersant at $50^{\circ}C$. Freezing of a slurry is performed at $-25^{\circ}C$ while the growth direction of the camphene is unidirectionally controlled. Pores are generated subsequently by sublimation of the camphene during drying in air for 48 h. The green bodies are hydrogen-reduced at $400^{\circ}C$ and then sintered at $800^{\circ}C$ and $900^{\circ}C$ for 1 h. X-ray diffraction analysis reveals that the NiO powder is completely converted to the Ni phase without any reaction phases. The sintered samples show large pores that align parallel pores in the camphene growth direction as well as small pores in the internal walls of large pores. The size of large and small pores decreases with increasing powder content from 5 to 10 vol%. The influence of powder content on the pore structure is explained by the degree of powder rearrangement in slurry and the accumulation behavior of powders in the interdendritic spaces of solidified camphene.
안면계측법을 이용한 과도한 교합면 마모 환자의 전악 수복: 증례보고
박찬 ( Chan Park ),강동완 ( Dong Wan Kang ),정재헌 ( Jae Hun Jeong ),김희중 ( Hee Jung Kim ) 조선대학교 구강생물학연구소 2011 Oral Biology Research (Oral Biol Res) Vol.35 No.1
The patient was 58 years old male and visited for the treatment of missing teeth and aesthetic restoration resulted from abrasion. Full mouth rehabilitation with the increase of vertical dimension was planned through oral examination, radiographic examination, model examination and the evaluation of vertical dimension. The increasing amount of vertical dimension was determined 4mm by using facial measurement. Centric occlusion was determined. Then, vertical dimension was increased 4 mm on articulator. Diagnostic wax-up was conducted. To evaluate whether increase of vertical dimension is proper, follow-up after installation of provisional restoration was observed and continuous check and adjustment was conducted. In this period, prognostic poor teeth was extracted, and endodontic, periodontic treatment and implant was conducted. The group function which bear lateral force on natural teeth was set up to make stable occlusal contact at centric occlusion and reduce lateral force unfavorable to implant. After long term follow-up on patient mouth, the vertical dimension of provisional restoration was relocationed equally to final restoration. This case is reported that the patient, as mentioned above, who has decreased vertical dimension caused by excessive abrasion was recovered aesthetic, functional factors through prosthodontic treatment with increasing vertical dimension.