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Thermocycling이 금속과 레진시멘트간의 결합강도에 미치는 영향
강건구,정관호,최정호,안승근,송광엽,박찬운,Kang, Geon-Gu,Chung, Kwan-Ho,Choi, Jeong-Ho,Ahn, Seung-Geun,Song, Kwang-Yeob,Park, Chan-Woon 대한치과보철학회 1996 대한치과보철학회지 Vol.34 No.2
The purpose of this study was to evaluate the effect of thermocycling on bond strength between metal and resin cement according to thermocycling, and to observe the bond failure modes with optical microscope(X30). For this purpose, Super-Bond C & B and Panavia 21 resin cement were used. Metal specimens were made of Vera-Bond and the surface of specimens were sandblasted with $50{\mu}m$ aluminum oxide. All experimental groups were stored in $37^{\circ}C$ distilled water for 72 hours, followed by thermocycling between $5^{\circ}C$ and $55^{\circ}C$ with 15 second dwell time. 500, 1000, 2000 cycles of thermocycling were executed and the tensile bond strength was measured by Instron Universal Testing Machine(Model 4201) The obtained results were as follows : 1. Super-Bond C & B and Panavia 21 did not show statistically significant difference accor-ding to thermocycling test(P>0.05). 2. Super-Bond C & B specimens exhibited statistically significant higher tensile bond stre-ngth than Panavia 21 for all experimental groups(P<0.05). 3. Super-Bond C & B exhibited mixed mode failure with partial adhesive and partial cohe-sive failure, and most of Panavia 21 exhibited cohesive failure and some mixed mode failure.
전기와 미녹시딜 복합 자극을 통한 인간 모유두세포의 성장 촉진 상승효과
우영준 ( Young Jun Woo ),정관호 ( Kwan Ho Jeong ),김정은 ( Jung Eun Kim ),강훈 ( Hoon Kang ) 대한피부과학회 2016 大韓皮膚科學會誌 Vol.54 No.5
Background: Previous published clinical studies have demonstrated the positive effects of electrical stimulation (ES) on hair growth. Minoxidil (MXD) enhances hair growth by prolonging the anagen phase of hair follicles. MXD is used to promote hair growth in androgenetic alopecia. Objective: To investigate the combined effect of ES and MXD on cultured human dermal papilla cells (hDPCs). Methods: hDPCs were electrically stimulated with different parameter settings of alternating current. Electrically stimulated hDPCs were incubated in an MXD medium, after which cell proliferation was measured using an MTT assay. Ki-67 and β-catenin expressions were measured by immunofluorescence assay. In addition, Wnt/β-catenin pathway-related gene expressions were measured by real time-PCR, and phosphorylated ERK and AKT protein levels were measured by western blot assay. Results: The combination of 8 V-1 MHz ES and MXD treatment promoted hDPC proliferation effectively, compared with that in the control, ES alone, or MXD alone treatment groups. The immunofluorescence assay showed that the expression of Ki-67 and β-catenin significantly increased in the combined treatment group. Most of the Wnt/β-catenin pathway-related gene expressions increased more with combined treatment than with the control, ES alone, or MXD alone treatments. However, there were no significant differences in the expression levels of phosphorylated ERK and AKT among the treatment groups. Conclusion: ES combined with MXD treatment had a synergistic effect on the proliferation of hDPCs. This might be through the synergistic activation of the Wnt/β-catenin pathway. (Korean J Dermatol 2016;54(5):341∼349)
합성 세라마이드가 두피에 미치는 임상적 영향에 대한 비교 관찰
박혜리 ( Hye Ree Park ),정관호 ( Kwan Ho Jeong ),김정은 ( Jung Eun Kim ),강훈 ( Hoon Kang ) 대한피부과학회 2021 대한피부과학회지 Vol.59 No.4
Background: Ceramide offers an important barrier function to the epidermis. It can reduce epidermal water loss and inhibit the production of dandruff. Ceramide is essential in protecting hair and can be used as a cosmetic ingredient to improve seborrheic dermatitis and uncomfortable symptoms. Objective: We aimed to evaluate the efficacy of synthetic ceramide on dandruff, erythema, sebum secretion, and scalp water loss. Methods: We enrolled 20 subjects. Ten were randomly assigned to a group using a synthetic ceramide containing shampoo and the other 10 were assigned to the control group. The subjects underwent evaluation of the scalp before the trial and after using the shampoo for 4 weeks. Scores were given for dandruff and scalp erythema. Sebum secretions were evaluated using a sebumeter and were checked at four different scalp sites. The water content of the scalp was measured using a corneometer at the same sites. Results: After 4 weeks, 8 patients showed favorable outcomes in dandruff in the ceramide group compared to 4 patients in the control group. Four patients displayed favorable outcomes in erythema in the ceramide group compared to 3 patients in the control group. Sebum secretion increased in the ceramide group and decreased in the control group, but the difference was not statistically significant. The water content showed a tendency to increase in the ceramide group, whereas the water content significantly decreased in the control group. Conclusion: These results indicate that synthetic ceramide is effective at improving dandruff, erythema, and reducing scalp water loss. (Korean J Dermatol 2021;59(4):277∼283)