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이중 지대주에서 티타늄 링크 높이가 지르코니아 지대주와의 유지력에 주는 영향
신홍수(Hong-Soo Shin),허수복(Soo-Bok Her),석수황(Soo-Hwang Seok),이유미(Yu-Mi Lee),임범순(Bum-Soon Lim) 대한치과재료학회 2013 대한치과재료학회지 Vol.40 No.3
The aim of present study was to evaluate the effects of link height and dental cements on the retention force between titanium link and zirconia abutment in the Ti-Zr bicomponent abutment system. Three different height (2.0, 2.5, and 3.0 mm with 0o taper) of titanium links (MonoDent, Korea) were machined and pertinent zirconia abutments (Acucera, Korea) were fabricated with CAD/CAM. One hundred thirty five titanium links and zirconia abutments were prepared. Zirconia abutments were cemented on their respective titanium links with three different types of dental cements, such as zinc phosphate (Fleck’s), resin-modified glass ionomer (RMGI, RelyX Luting 2), self-adhesive resin cement (RelyX U200). Specimens were stored in deionized water (37℃) for 24 hours until testing. Pull-off test was performed using a universal testing machine (Instron 4466, USA) with a crosshead speed of 1 mm/min. Fifteen specimens were tested at each experimental group. The data were analyzed using t-test and Newman-Keuls multiple comparisons test (p=0.05). RMGI showed the lowest retention force (p<0.05) and ZPC showed similar retention force with resin cement (p>0.05) regardless of link heights. For ZPC groups and self-adhesive resin cement groups, 3.0 mm height showed significantly higher retention force than both 2.5 mm and 2.0 mm groups which were not significantly different (p>0.05) For RMGI groups, the retention force increased significantly with increasing of link height (p<0.05). To obtain the proper retention in clinical situation, height of titanium link should be no less than 3.0 mm.
임범순(Bum-Soon Lim),허수복(Soo-Bok Her) 대한치과의사협회 2011 대한치과의사협회지 Vol.49 No.5
The introduction of zirconia-based materials to the dental field broadened the design and application limits of all-ceramic restorations. Most ceramic restorations are adhesively luted to the prepared tooth, however, resin bonding to zirconia components is less reliable than those to other dental ceramic system. It is important for high retention. prevention of microleakage, and increased fracture resistance, that bonding techniques be improved for zirconia system. Strong resin bonding relied on miromenchanical interlocking and adhesive chemical bonding to the ceramic surface, requiring surface roughening for mechanical bonding and surface activation for chemical adhesion. In many cases, high strength ceramic restorations do not require adhesive bonding to tooth structure and can be placed using conventional cements which rely only on micromechanical retention. However, resin bonding is desirable in some clinical situations. In addition, it is likely that strong chemical adhesion would lead to enhanced long-term fracture and fatigue resitance in the oral environment.
반복하중이 다양한 임플란트-지대주의 풀림 토크에 주는 영향
김대성(Dae-Sung Kim),허수복(Soo-Bok Her),이상혁(Sang-Hyeok Lee),이상훈(Sang-Hoon Rhee),양형철(Hyeong-Cheol Yang),임범순(Bum-Soon Lim) 대한치과재료학회 2011 대한치과재료학회지 Vol.38 No.3
The object of this study was to evaluate the effect of the number of cyclic loading and materials for abutment on the screw loosening. Three different abutments were tested such as titanium, zirconia and zirconia-alumina composite. Titanium fixtures and screws were used for implant systems for all experimental groups. Four different cyclic loads (105, 5×105, 10×105 a nd 20×1 05), between 0 and 60 N, were applied 30° angled to the axial direction of the underlying abutment. Removal torque of screw was measured after and before cyclic loading using digital torque gauge. Five measurements were performed at each experimental group. The data were analyzed using t-test and Tukey multiple comparisons test (p=0.05). Although there was a significant decrease in the removal torque values in the all of experimental groups, screw loosening could not be detected tactilely. This may indicate that the remaining tightening torque would serve clinically for a longer period of time regardless of abutment materials as well as application of cyclic loading.
고압증기멸균처리가 치과용 지르코니아 세라믹의 저온열화에 주는 영향
이태훈(Tae-Hoon Lee),이상혁(Sang-Hyeok Lee),최재윤(Jae-Yoon Choi),허수복(Soo-Bok Her),안진수(Jin-Soo Ahn),이상훈(Sang-Hoon Rhee),양형철(Hyeong-Cheol Yang),임범순(Bum-Soon Lim) 대한치과재료학회 2010 대한치과재료학회지 Vol.37 No.2
The aim of this study was to evaluate the effect of autoclave treatments on the phase transformation of dental zirconia ceramics, Four commercially available tetragonal zirconia polycrystals (Cercon Base, CRB; Lava, LAV; ZioCera, ZOC; Rainbow, RAB) and one zirconia/alumina composite (ZirAce, ZRA) were tested, Disk type (10×1 ㎜) of specimens were prepared. For grain size estimations, specimens which were thermally etched at 1,500℃ for 1h, were analyzed with SEM. Specimens were autoclave treated at 130℃ for 1, 3, 5, 10, and 15hrs, The phases of specimens were identified by x-ray diffractometer before and after autoclave treatment, and the relative amount of monoclinic phase was calculated, The average grain sizes were approximately 0,43 ㎛ for CRB and ZOC, more than 0.68 ㎛ for LAV and RAB, about 5 ㎛ for ZRA. There were no significant differences in the average grain sizes before and after autoclave treatment for 15hrs. CRB, ZOC and ZRA specimens showed little phase transformation after autoclave treatment for 15hrs (<9%), LAV and RAB, however, showed remarkable phase transformation after autoclave treatment for 5hrs (>20%) and severe phase transformation after autoclave treatment for 10hrs (50%, 44%, respectively). Although LAV and RAB groups showed high monoclinic fraction by autoclave treatments, they were reverse phase transformed by annealing treatment at 1,200℃ for 2 hrs.
Cytocompatibility Evaluation of Etched Zirconia Ceramics Using Human Osteoblast-Like MG 63 Cells
Ji-Ho Lee(이지호),Young-Kyun Lee(이영균),Jae-Young Kim(김재영),Kyoung-Hun Kim(김경훈 ),Soo-Bok Her(허수복),Yong-Gun Kim(김용건),Jin-Woo Park(박진우),Jo-Young Suh(서조영) 대한치과재료학회 2016 대한치과재료학회지 Vol.43 No.4
본 연구는 통상적으로 사용하는 티타늄에서 산 처리를 하였을 때 거친 면을 형성함으로써 골모세포의 활성을 증가시킨다는 연구들을 근거로 니오 비움 옥사이드 (Nb₂O<SUB>5</SUB>)가 첨가된 (Y, Nb)-TZP에 1.5시간, 2시간, 2.5시간 산 처리를 한 군과 산 처리를 하지 않은 군에서 표면특성 및 골모유사세포 (osteoblast-like MG 63 cells)의 세포 반응을 연구하였다. 산 처리되지 않은 (Y, Nb)-TZP와 산 처리된 (Y, Nb)-TZP의 표면특성은 주사전자현미경, 엑스선 회절분석, 광학 형상측정법을 통해 평가하였고, 골모유사세포의 세포 활성도를 관찰하기 위해서는 세포부착양상, 세포증식 및 Alkaline phosphatase 활성도를 염색하여 비교 관찰하였다. 본 연구결과 엑스선 회절분석에서 불산/질산 혼합용액에 지르코니아 시편을 산 처리한 후에도 대부분이 정방정계인 구조적 안정성을 나타내었고, 세포 활성도 분석은 생존력, 세포독성인 측면에서(Y, Nb)-TZP가 적합한 기질임을 시사했다. 그러므로, 이 연구에서는 Y-TZP의 저온열화현상에 대한 보상으로 니오비움옥사이드 (Nb₂O<SUB>5</SUB>)를 안정화제로 사용함으로써, 적절한 시간 동안 산 처리를 한 (Y, Nb)-TZP는 골모유사세포 (MG 63)의 증식과 초기 분화를 위한 적절한 기질로 사료된다.
표면처리가 수리한 구치용 강화형 콤포짓트 레진의 전단결합강도에 미치는 영향
허수복,임범순,김철위 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.2
Despite significant improvement in the mechanical properties of composite resins, They still undergo wear, discoloration, fracture with time. Repair is an alternative to the total replacement of old composite resin restoration, because it reduces pulpal trauma, and cost, time. The successful bond strength between new and old composite usually requires micromechanical retention and coating of old composite with unfilled resin. Micromechanical retention can be achiveved by sandblasting, grinding, or acid etching. Now application of bonding agent after sandblasting is known as the most effective surface treatment for composite repair. The aim of this study is to compare sandblasting with grinding as micromechanical reughening method and to evaluate the effect of bonding agent, silane primer, and post-cure thermocycling on shear bond strength of repaired posterior composite resins. The three posterior composite resins were used in this study. Charisma, Aelitefil, and Z-100 were for substrate resin and only Z-100 for repair resin. Then they were thermocycled(5∼55℃, 1,000 cycles) for aging. The substrate surface was treated by various methods : 1 group-NT (no treatment), 2 group-BA (bonding agent ; Scotchbond MP), 3 group-SB (sandblastion with 50μm alumina partcles), 4 group-GR (400 grit Sic grinding), 5 group-SB+BA, 6 group-GR+BA, 7 group-SB+PR (primer : Scotchprime-ceramic primer) +BA, 8 group-GR+PR+BA. After speciments 24 hours and the other 5 specimens were thermocycled again(5∼55℃, 600 cycles). The sheal bond strength wa measured by Instron testing machine with 1.0 mm/min. cross-head speed. From the experiment, the following results were obtained : 1. Shear bond strength of sandblasted group was significantly higher(P<0.05) than that of control group, but there was no significant difference(P>0.05) of bond strength between ground group and control group. However application of bending agent after grinding significantly(P<0.05) increase the bond strength of contorl group. 2. Although the values of shear bond strength of silane-primed groups were higher than those of unprimed groups, there was no significancy(P>0.05) 3. When bonding agent has been applicated, there was no statistically significan difference between sandblasted group and group group(P>0.05). 4. No statistically significant difference of shear bond strength was made by therocyling(5∼55℃, 600 cycles)