치과용 금-은-팔라디움계 합금 및 니켈-크롬계 합금의 경도에 관한 연구

임시덕,김재도 대구산업정보대학 1994 논문집 Vol.8 No.-

The present study compared the hardness of Au-Ag-Pd alloys and Ni-Cr alloys popularly used as the dental restorative metal. Experimented alloys of Au-Ag-Pd aloys are SU-MIN type Ⅲ of SU-MIN Dental Material Company, CBW-G type Ⅲ of HANKUK-ENGELHARD Corp. and of Ni-Cr alloys are NEW CROWN of RUBY DENTAL Co. and SAN KIN CB-80 of SAN-KIN Co., respectively. The hardness values of Au-Ag-Pd alloys are lower than those of Ni-Cr alloys relatively and the hardness values of each groups are as follows. The Group Ⅳ showed the largest mean values(293.5±18.6), followed by the Group Ⅲ(263.3±24.4), the Group Ⅰ(206.6±7.2) and the Group Ⅱ(179.9±5.2).

기계적 유지형태 부여를 위한 불산식각법을 대처할 수 있는 도재 표면처리 방법에 대한 연구

임시덕 대구산업정보대학 1995 논문집 Vol.9 No.2

The present study investigated the effectiveness of microsandblast surface treatment technique on porcelain-resin bonding as a replacement of HF etching technique. VITA VMK 68 porcelain specimens were etched with 9.5% HF etching gel(Group I) and microsandblasted with 50㎛ Al₂0₃ powder(Group Ⅱ). After surface pre-treatment, the primer(NTG-GMA) and bonding resin(BIS-GMA unfilled resin) were applied, and then built up the resin composite layer by layer using vinyl matrix which is 5mm diameter. Group I showed greater shear bond strength than Group Ⅱ. But there were not great differneces between these two groups. The relationship between the surface morphology after surface pretreatment, fractured surface finding and shear bond strength was examined. It revealed that the difference of surface morphology influenced the bonding strength and the resulting fractured surface findings. Although Group I had more rough surface texture and greater shear bond strength, the differences between these two groups were not considerable. So we proposed that the microsandblast technique is a good replacement of hazardous HF etching technique.

금속-도재 수복물에서 비귀금속 합금의 재사용에 따른 결합강도에 관한 연구

임시덕,이은경,장기환 한국위생과학회 2001 한국위생과학회지 Vol.7 No.2

치과용 비귀금속 합금 중 Verabond와 RecilliumⅢ,Ⅴ를 사용하여, 새 금속만 사용한 group(Ver-1, Rex3-1, Rex5-1)과 재사용한 group(Ver-2, Rex3-2, Rex5-2)의 경도측정을 한 결과 새금속만을 사용한 group에서는 Ver-1이 경도측정치가 가장 높았으며, 재사용한 group에서는 Rex5-2가 가장 높은 경도 측정치를 나타내었고 Rex3에서는 Rex3-1과 Rex3-2간의 경도 차이는 없었다. Verabond와 RexolloumⅢ,Ⅴ를 사용한 것과, 새 금속만을 사용하여 Vita Omega Porcelain을 올려서 소성하고, 금속과 도재간의 결합강도를 측정 한 것과, 한번 주조된 비귀금속 합금에 50%의 새로운 합금을 사용하여 Vita Omega Porcelain을 올려서 소성하고, 금속과 도재간의 결합강도를 측정한 결과 재 사용한 금속 중 Rex5-1이 금속과 도재간의 결합강도가 가장 좋은 것으로 나타났고, 주조된 합금에 새 금속 50%를 섞은 group에서는 Rex5-2가 결함강도가 가장 낮은 것으로 나타났다. 그러나 Ver-1과 Ver-2는 금속과 도재간의 결합강도는 큰 차이점이 없는 것으로 보인다. The hardness of non-precious dental alloy was measured using Verabond and Rexillium Ⅲ,Ⅴ, The dental alloy was group into a new alloy group (Ver-1, Rex5-1) and used alloy (Ver-2, Rex5-2). As a result, Ver-1 showed the highest hardness value in a new alloy group. and Rex5-2 showed the highest hardness value in a used alloy group. However, Rex3-1 and Rex3-2 did not show any difference in hardness. The bonding strength between alloys used Verabond and Rexillium Ⅲ,Ⅴ was tested; The bonding strength between porcelain and a new alloy, which was firing after build up weth Vita Omega porcelain; was tested; Also, the bonding strength between porcelain and metal, which was casted and firing after build up with vita Omega pocelain was tested. I this case, the casted alloy was mixed with a new alloy by hay in weight. As a result, Rex5-1 yielded the highest strength among the used alloy group. Rex5-2 was the lowest in bonding strength among the alloy mixed with casted alloy and a new alloy by hay in weight. On the other hand, Ver-1 and Ver-2 did not show apparent difference in bounding strength.

齒科用 貴金屬 合金과 陶材사이의 化學的 結合에 關한 實驗的 硏究

林時德,남상용 대구산업정보대학 1992 논문집 Vol.6 No.-

Real bonding between metal and porcelain is influenced by various bonding Mecanisms which also influence each other, and is caused by aseries of complicated thermochemical reaction. For this reason, clear determination of the degree and distribution. Fators influencing the bonding strength consist of chemical bonding(including primary bond)52%, Mechanical bonding 22%, compression bonding 26%. Effects of the Base Metal Elements Added to Allots. The elements Sn, In, and Fe were added originally in accordanc with the concept that they might strengthen the Alloy though a dispersion effect. We heated the Degudent G. U Dental porcelain and analysis the surface elemental chang by Energy Dyspersive X-ray analysis and obtained the result that mainly the In element was concentrated to the alloy surface.

短時間鑄造法에 의한 非貴金屬合金鑄造體의 適合精度와 金屬組織에 關한 硏究

林時德,金在道 대구산업정보대학 1989 논문집 Vol.3 No.-

The purpose of this study was to investigate the fitness accuracy and microstructure of Ni-Cr dental alloy castings by quick heat-up procedures. Fitness between metal mould and castings was measured by ready made metal mould in upper dia. 9㎜., lower dia. 10㎜, height 10㎜. Microstructure was observed by metallurgical microscope after etched acid solutions. The results were as follows: 1. The fitness accuracy of normal procedures was 9~31㎛, and the average was 20㎛. 2. The fitness accuracy of quick heat-up procedures was 12-34㎛, and the average is 22㎛. 3. The fitness acccuracy of quick heat-up procedures were more than normal procedures, but was similar to it. 4. Microstructure of normal proedures was finer grain size than quick heat-up proedures, and existed in porosities and dendrite structure by both procedures.

주조온도의 변화가 Ti주조성에 미치는 영향에 관한 연구

林時德 대구산업정보대학 1997 논문집 Vol.11 No.2

To investigate the effect of casting temperature on the castability of titanium, gird sheet type of wax patterns were used and the castability was determined by the calculation of an open hole of the cast. The results obtained are as follows. 1. In the case of Titanium vest investment material, castability was best at 600℃ casting temperature and 38 cycles of centrifugal force. 2. The castability of CD Titan was worse than the that of Titanium vest in spite of showing the best castability at 350℃ casting temperature and 38 cycles of centrifugal force. 3. Casting defects were concentrated on the center part of the case in all conditions. 4. In the casting defect confirmation by X-ray the inner part of the cast was rather sound.

齒科用 닉켈-크롬合金의 引張强度와 微細組織에 관한 硏究

林時德,玄鍾九 대구산업정보대학 1987 논문집 Vol.1 No.-

In this study The auther set casting mold degree on 500℃ 700℃ 900℃ and carried out centrifugal casting about Ticonium premium 100 which is Ni-Cr alloy and widely used as dental non-precions alloy. The outhor measured tensile strength and abserved fine structure by microscope and obtained following conclasions: 1. The tensile strength was 457.9±21.7 /kg/mm2 in 500℃ casting mold degree. 412.3+19.6kg/㎟ in 700℃ casting mold degree and 398.3±26.5kg/x-㎟ in 900℃casting mold degree. The tensile strength was reduced when the casting mold degree increased. 2. In all casting mold degree resinous structure-the typical casting structure-was formed and fine air bubble casting defect was appeared. 3. When casting mold temperature increased resinous crstal was appeard coarsely and largely.

14K 및 16K 齒科用 金合金의 硬度 및 微細組織에 關한 硏究

金在道,林時德 대구산업정보대학 1989 논문집 Vol.3 No.-

The purpose of this study was to investigate the variation of micro-vickers hardness and microstructure of dental casting gold alloys manufactured by Korean D Co. Hardness number was measured by micro-vickers hardness tester and microstructure was observed by metallurgical microscope. The results were as follows: 1. Hardness number of experimental group I was 183.62±12.65Hv, hardness number of experimental group Ⅱ was 161,29±9.37Hv, respectively. 2. Hardness number of experimental group I was more approximately 14% than experimental group Ⅱ and both groups were higher hardness number than type Ⅳ gold alloys of K. D. A. specification No. 5. 3. Microstructure of experimental group I was finer structure than experimental group Ⅱ and both groups were existed by dendritic structure and micro porosity.

Na^(+)-Ca^(2+) Exchange in Sarcolemmal Vesicles Isolated from Mesenteric Arteries of Normotensive and Spontaneously Hypertensive Rats

Lee, Jeung-Soo,Lim, Shi-Duk 대구산업정보대학 1992 논문집 Vol.6 No.-

正常血壓쥐와 高血壓쥐의 腸間膜動脈으로부터 形質膜을 分離하고 形質膜의 Na^(+)-Ca^(2+) 交換過程을 比較 檢討하여 다음과 같은 結果를 얻었다. 1. 形質膜 分劃은 homogenate보다 形質膜이 7~10배 많이 含有되어 있었다. 2. Na^(+)으로 loading시킨 形質膜vesicles을 K^(+)-medium中에 加했을 때는 빠른 速度로 Ca^(2+)攝取가 일어났으나 Na^(+)-medium中에 加했을 때는 Ca^(2+)攝取가 거의 일어나지 않았으며, 形質膜 vesicles을 K^(+)으로 loading시켜도 Ca^(2+)攝取는 일어나지 않았다. 3. 形質膜 vesicles中의 ^(45)Ca^(2+)은 빠른 速度로 medium中으로 流出되었다. 4. 高血壓쥐 動脈形質膜 vesicles은 正常血壓쥐에서 보다 Na^(+)依存性 Ca^(2+)攝取는 有意義하게 增加하였으나 vesicles로부터의 Ca^(2+)流出은 顯著히 減少하였다. 5. 이상 成績으로 미루어 動脈形質膜에도 Na^(+)-Ca^(2+)交換機轉이 存在하며, 血管膜을 통한 이러한 Na^(+)-Ca^(2+)交換過程의 促進이 高血壓의 誘發 또는 進展에 關與되어질 것으로 思料된다.

수은(Hg2+) 및 니켈(Ni2+)이 [³H]Quinuclidinyl Benzilate의 Muscarinic Receptors 결합에 미치는 영향

이정수,임시덕,배기철,이신웅 嶺南大學校 環境問題硏究所 1991 環境硏究 Vol.11 No.1

[³H]Quinuclidinyl benzilate(QNB) binds specifically to muscarinic receptors which mediate a number of important physiological reponses of acetylcholine. In the present study, the effects of ?? and ?? on [³H]QNB binding to the cerebral microsome were investigated. Microsomes were treated with ?? or ?? for 15min at 37℃ and then binding experiments were carried out. ?? and ?? inhibited [³H]QNB binding in the presence of 100pM [³H]QNB to muscarinic receptors with ?? value of 2.1 μM and 350mM, respectively. The inhibition of [³H]QNB binding by these metals was irreversible. Both ?? and ?? decreased the binding site concentration for [³H]QNB binding without affecting ?? value of [³H]QNB. These results indicate that heavy metals inactivate the muscarinic receptors with different potency.