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RISS 인기검색어
- 검색키워드
- 저자 : Gerelmaa Myagmar (검색결과 2 건)
- 무료
- 기관 내 무료
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Wear of 3D printed and CAD/CAM milled interim resin materials after chewing simulation
Gerelmaa Myagmar,Jae-Hyun Lee,Jin-Soo Ahn,In-Sung Luke Yeo,Hyung-In Yoon,Jung-Suk Han 대한치과보철학회 2021 The Journal of Advanced Prosthodontics Vol.13 No.3
PURPOSE. The purpose of this in vitro study was to investigate the wear resistance and surface roughness of three interim resin materials, which were subjected to chewing simulation. MATERIALS AND METHODS. Three interim resin materials were evaluated: (1) three-dimensional (3D) printed (digital light processing type), (2) computer-aided design and computer-aided manufacturing (CAD/CAM) milled, and (3) conventional polymethyl methacrylate interim resin materials. A total of 48 substrate specimens were prepared. The specimens were divided into two subgroups and subjected to 30,000 or 60,000 cycles of chewing simulation (n = 8). The wear volume loss and surface roughness of the materials were compared. Statistical analysis was performed using oneway analysis of variance and Tukey’s post-hoc test (α=.05). RESULTS. The mean ± standard deviation values of wear volume loss (in mm3) against the metal abrader after 60,000 cycles were 0.10 ± 0.01 for the 3D printed resin, 0.21 ± 0.02 for the milled resin, and 0.44 ± 0.01 for the conventional resin. Statistically significant differences among volume losses were found in the order of 3D printed, milled, and conventional interim materials (P <.001). After 60,000 cycles of simulated chewing, the mean surface roughness (Ra; μm) values for 3D printed, milled, and conventional materials were 0.59 ± 0.06, 1.27 ± 0.49, and 1.64 ± 0.44, respectively. A significant difference was found in the Ra value between 3D printed and conventional materials (P =.01). CONCLUSION. The interim restorative materials for additive and subtractive manufacturing digital technologies exhibited less wear volume loss than the conventional interim resin. The 3D printed interim restorative material showed a smoother surface than the conventional interim material after simulated chewing.
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Comparison of the Osteogenic Potential of Titanium and Modified Zirconia-Based Bioceramics
Cho, Young-Dan,Shin, Ji-Cheol,Kim, Hye-Lee,Gerelmaa, Myagmar,Yoon, Hyung-In,Ryoo, Hyun-Mo,Kim, Dae-Joon,Han, Jung-Suk Molecular Diversity Preservation International (MD 2014 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.15 No.3
<P>Zirconia is now favored over titanium for use in dental implant materials because of its superior aesthetic qualities. However, zirconia is susceptible to degradation at lower temperatures. In order to address this issue, we have developed modified zirconia implants that contain tantalum oxide or niobium oxide. Cells attached as efficiently to the zirconia implants as to titanium-based materials, irrespective of surface roughness. Cell proliferation on the polished surface was higher than that on the rough surfaces, but the converse was true for the osteogenic response. Cells on yttrium oxide (Y<SUB>2</SUB>O<SUB>3</SUB>)/tantalum oxide (Ta<SUB>2</SUB>O<SUB>5</SUB>)- and yttrium oxide (Y<SUB>2</SUB>O<SUB>3</SUB>)/niobium oxide (Nb<SUB>2</SUB>O<SUB>5</SUB>)-containing tetragonal zirconia polycrystals (TZP) discs ((Y, Ta)-TZP and (Y, Nb)-TZP, respectively) had a similar proliferative potential as those grown on anodized titanium. The osteogenic potential of MC3T3-E1 pre-osteoblast cells on (Y, Ta)-TZP and (Y, Nb)-TZP was similar to that of cells grown on rough-surface titanium. These data demonstrate that improved zirconia implants, which are resistant to temperature-induced degradation, retain the desirable clinical properties of structural stability and support of an osteogenic response.</P>
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