http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
광중합 코팅제에 따른 수복용 글라스 아이오노머 시멘트의 경도 변화
임범순,김철위 서울대학교 치과대학 치과생체재료학교실 1994 치과생체재료학 논문집 Vol.2 No.1
This study was done to compare the effect of various surface coating on harness for three different glass ionomer cements. The glass ionomer cements used were self-curing, light-curing and water hardening glass ionomer cement. The experimental groups were coated with Fuji Coat LC, Ketac-Glaze, Fortify, Schotchbond 2 and Fuji Vanish while the control group was uncoated. The half of the experimental groups were stored in 37℃ air, and the others wee placed in lactic acid solution. The surface harness for each specimen was then measured after 15 minutes, 1 hour, 1 day, 7 days and 30 days using a Vickers microhardness tester. From the experiment, the following results wer obtained ; 1. In general for the glass ionomer cements without protective surface coating, stroing in air showed the large hardness number and produced dehydration, which caused increase in hardness with time. After immediately mixing (15 min.) of cements, the glass ionomer cements without surface coating ranked in order of high value of surface hardness were water-hardening, glass ionomer cement, light-curing glass ionomer cement and self-curing glass ionomer cement. 2. The hardness of the glass ionomer cement with aged in lactic acid soultion was smaller than that in air. The surface damage resulting from dissolution in lactic acid caused a commensurate decrease in harness with time. 3. The combination of the self-cured glass ionomer cements and GL or FCS coating material appeared to be more effective than others in providing an enhanced hardness. The light-cured glass ionomer cement showed a relatively high in surface harness when the surface coating materials KGL, FCS and SLA were applied. The FCS coating material leaded to a significant improvement in the surface hardness for the water-hardened glass ionomer cement.
임범순 大韓齒科器材學會 1995 대한치과재료학회지 Vol.22 No.2
The purpose of this study was to synthesize the experimental restorative glass ionomer cement by change of glass component and fusing temperature. Mixtures of Al₂O₃, SiO₂, CaF₂, NaF, AlPO₄and SrCO₃were fused in recrystallized alumina crucibles. Initially 6 mixtures were fused at 3 different temperatures (1050℃, 1200℃, and 1350℃), but 17 groups (exception of GI-6C) were tested. The glasses were ground, and the fraction which passed through a 44㎛ sieve was collected. The glass powders were analyzed by a differential thermal analyzer and a x-ray powder diffractometer. A chemical-cured glass ionomer cement (FI-A) and a light-cured glass ionomer cement (FI-B) were used as control group. The powder/liquid ratio for cement formation was 2.3g/0.8g. Compressive strength of specimens was measured by a Instron universal testing machine. Surface hardness of specimens was evaluated by Vickers hardness tester, and fluoride ion release from specimens was estimated by the fluoride ion electrode and standard solutions. Solubility of specimens in 0.1 M lactic acid solution was also measured. From the experiment, the following results were obtained. 1. Compressive strength, surface hardness, and fluoride release of experimental groups which were fused at 1050℃ were greater than those of the groups fused at 1350℃. Experimental groups which were fused at 1350℃ however, exhibited the lowest solubility in lactic acid solution. 2. GI-1 group base cements showed better physical properties than the other groups. Especially, the results showed that GI-1B base cement was comparable in physical properties to Fuji Ⅱ glass ionomer cement except for short working time. 3. It was observed that SrCO₃would act as a radio-opacifier in GI-2, GI-3, GI-5 and GI-6 base cements. 4. GI-3A and GA-6B groups were unsuitable for clinical use since it base cements dissolved in lactic acid solution and exhibited a delayed setting reacting respectively. GI-6A Group was unsuitable since it base cement dissolved in lactic acid as well as exhibited a delayed setting reaction.
치과용 콤포짓트 레진의 적정중합을 위한 최소 광조사 시간 평가
임범순,이용근,김철위,최기열,이중배 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.1
The aim of this study was to estimate the minimum irradiation time for dental composites using a dynamic mechanical analyzer (DMA) and FT-IR. Six commercially available dental composites with A3 shade were tested: Heliomolar RO (Vivadent, Liechtenstein), Charisma (Kulzer, Germany), Herculite XRV Enamel (Kerr, USA), Aelitefil (Bisco, USA), Z100 (3M, USA), and Z250 (3M, USA). Storage modulus was measured by using DMA (StressTech Rheometer, Rheologica Instrument, Sweden) with fast oscillation mode (1 Hz). After disk-type (4 ㎜ ?1 ㎜) samples were irradiated with 500 mW/cm2 for 1, 2, 3, 4, 5, 10, 15, 20, and 30 s, storage modulus was recorded continuously for 60 min. Degree of conversion was also measured using FT-IR spectroscopy (FTS-165, Biorad Win-IR, Perkin-Elmer, USA) at 60 min after irradiation with same curing condition as DMA test. Sample irradiated with 500 mW/cm2 for 120 s was used as a control. The average of results for five specimens was compared using Tukey multiple comparison test (p=0.05) and the minimum irradiation time of composites was determined. The minimum irradiation time to get adequate polymerization was different depending on the dental composites. Both Z100 and Z250 require short irradiation times (5 s) and Charisma requires long irradiation time (15 s).