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배지명 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4
Ring liner allows the radial expansion of investment during setting, hygroscopic, and thermal expansion in casting ring. However, ring liner has been reported to be harmful to the health of human and environment. The aim of this study was to develop a new casting ring which does not require liner and to compare the casting accuracy of new casting ring with those of conventional casting ring. It was classified into five groups: conventional casting ring with and without liner, experimental casting rings with 11 mm holes, with medium square(11×41 mm) openings, and with large square(27×41 mm) openings. Each group was composed of 10 specimens. After wax patterns were made on a prefabricated metal die for crown, they were invested with gypsum-bonded investment(Cristobalite inlay investment, Whip Mix, U.S,A.). For metal, NPG^(TM)(Aalba Dent Inc, U.S.A.) was used for casting using centrifugal casting machine. The casting body was adapted to the original metal die and the marginal gap was checked by a light microscope after loading 1 kg for 10 seconds. The results were confirmed by SEM observations and analyzed statistically by Kruskal-Wallis Test(P=0.01) and Duncan's multiple range test. In the experimental casting rings, the bigger the openings of casting rings, the more accurate the casting bodies became(P<0.01). The experimental casting ring with medium and large square openings showed the comparable casting accuracy to the conventional casting ring with liner(P<0.01). Accordingly, newly developed casting rings with medium and large square openings are supposed to be used without liner clinically.
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NaOH 및 열수처리가 TiO2 나노튜브 표면의 수산화아파타이트 형성능에 미치는 효과
배지명,오승한 大韓齒科器材學會 2009 대한치과재료학회지 Vol.36 No.3
본 연구는 유사체액(simulated body fluid) 침지법을 이용하여 NaOH 및 열수처리가 TiO2 나노튜브의 수산화아파타이 트 형성능에 미치는 영향을 평가하는 것이다. NaOH 처리된 실험군에서는 ~5 nm 나노 침(nano needle) 형태를 가진 sodium titanate가 형성되었고, 이에 반하여 열수처리 후 NaOH 처리된 실험군의 경우, 60∼80 nm 구형 나노입자가 나노 튜브 표면에 형성되었다. 유사체액 침지 후, NaOH 처리된 실험군에서는 1일 만에 수산화아파트가 나노튜브의 표면에 형 성되기 시작하였고, 5일 경과 후 수산화아파타이트가 TiO2 나노튜브의 전 표면에 형성된 것이 확인되었다. 이에 반하여, NaOH 처리 후, 열수처리된 실험군은 침지 후 12시간 만에 나노튜브 표면에서 칼슘이 확인되었고, 1일 후 수산화아파타이 트가 나노튜브 전 표면에 형성된 것이 확인되었다. 따라서, 본 연구에서는 NaOH 처리가 TiO2 나노튜브의 수산화아파타이 트 형성을 촉진시키며, 열수처리와 NaOH 처리를 병행하였을 경우, NaOH 처리만 한 실험군보다 더 빠른 수산화아파타이 트 형성능을 나타내는 것을 확인하였다.
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포스트의 성분과 형태가 치아의 파절 저항성 및 파절 양상에 미치는 영향
배지명 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4
The aim of this study was to compare the fracture resistance and failure mode of natural teeth with endodontically treated teeth, with and without post systems that have different shapes and components. A total of 45 single rooted human incisors recently extracted within 2 weeks were divided into 9 groups, that were composed of natural teeth, endodontically treated teeth without post, and endodontically treated teeth with their crowns removed and restored with 7 kinds of different post systems. The root canal space and the residual tooth structure were treated with bonding agent, and all posts were cemented with dual-cured resin cement, followed by core build-up with light-cured translucent composite, except the cast posts. Each specimen was embedded in translucent acrylic resin with simulation of periodontal ligament and shear load was applied at 135-degrees angle to the long axis of the tooth using universal testing machine (Z020, Zwick), at a crosshead speed of 5 mm/min. The fracture resistances of 7 experimental post groups were applied to about 51-66% of that of natural teeth group. The highest fracture resistance was recorded for cast post and Para post among the groups restored with post and core (P<0.01). In failure mode, C-post, and FRC Postec showed favorable aspects by both naked eye and SEM observations.
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배지명,오승한 대한치과재료학회 2009 대한치과재료학회지 Vol.36 No.3
본 연구는 유사체액(Simulated Body Fluid) 침지법을 이용하여 NaOH 및 수화처리가 TiO2 나노튜브의 수산화아파타이트 형성능에 미치는 영향을 평가하는 것이다. NaOH 처리된 실험군에서는 ~ 5 nm 나노 침(nano needle) 형태를 가진 sodium titanate가 형성되었고, 이에 반하여 수화처리후 NaOH 처리된 실험군의 경우, 60 - 80 nm 구형 나노입자가 나노튜브 표면에 형성되었다. 유사체액 침지 후, NaOH 처리된 실험군에서는 1 일 만에 수산화아파트가 나노튜브의 표면에 형성되기 시작하였고, 5 일 경과 후 수산화아파타이트가 TiO2 나노튜브의 전 표면에 형성된 것이 확인되었다. 이에 반하여, NaOH 처리 후, 수화처리된 실험군은 침지 후 12 시간 만에 나노튜브 표면에서 칼슘이 확인되었고, 1 일 후 수산화아파타이트가 나노튜브 전 표면에 형성된 것이 확인되었다. 따라서, 본 연구에서는 NaOH 처리가 TiO2 나노튜브의 수산화아파타이트 형성을 촉진시키며, 수화처리와 NaOH 처리를 병행하였을 경우, NaOH 처리만 한 실험군보다 더 빠른 수산화아파타이트 형성능을 나타내는 것을 확인하였다.
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김광만,강우진,김경남,배지명 大韓齒科器材學會 1995 대한치과재료학회지 Vol.22 No.2
Nonresistance to closure and relative compression-resistance on setting are important factors in accurate recording of jaw relations. This study compared consistency, compressive stress at 1% strain and dimensional change to determine the accuracy of interocc1usal recording materials. Five kinds of materials were tested : Perfect VPS BITE(PV; Korea), Blu-Mousse(BM; U.S.A.), Ramitec(RA; Germany), Bosworth Superbite(SB; U.S.A.), Pattern Resin(PR; Japan). Consistency was measured with 10 samples of each brand, 5ml under 1330g loadings. Compression test was performed using Universal Testing Machine(Instron) at a rate of 10mm/min to the strain of l% to measure the compressive stress. Using Nissin dentiform, Vericheck(Denar) and Nikon measurescope centric occlusion without records(CORX), with records upon setting(CORO) and with records after 12 hrs(CORO12) were observed to measure the dimensional change. Results were as follows : 1. The flow of BM was significantly higher than others and that of PV was the lowest(p<0.01). 2. The compressive stresses of PR and SB were extremely high compared with others. Among the elastomers those of BM and PV were significantly greater than RA(p<0.05). 3. The position changes of elastic recording materials were significantly smaller than nonelastic materials(p<0.05). It was concluded that elastic interocclusal recording materials deviated less than nonelastic materials from their original positions and it seemed to be related more closely with consistency, compressive stress than with dimensional change of the material itself.
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