The effects of non-thermal atmospheric pressure plasma jet on implant surface in a dog model

Dept. of Dental Science/석사The purpose of this study was to investigate whether osseointegration can be improved with Non-Thermal Atmospheric Pressure Plasma Jet on SA surface implant in dogs. Implants were placed in maxilla and mandible of 6 mongrel dogs. Among the 41 SA surface implants, plasma injection was conducted on 20 implants in the experimental group, the 21 remaining non-treated implants constituting the control group. In the maxilla and mandible, 3 or 4 implants were placed, respectively. The dogs were sacrificed at either 4 or 8 weeks after implant placement. Bone volume was analyzed in a cylindrical shape determined by the 3 best threads and a circumferential zone within 50㎛ of the implant surface. A 3-dimensional bone volume analysis was conducted using micro-computed tomography and statistical analysis was performed with Wilcoxon rank-sum test. There was a statistically significant difference between the experimental and control group at 4 weeks. (p<0.05) The mean bone volume of 4 week was 57.88% (SD: 4.55) in the experimental group and 49.21% (SD: 5.75) in the control group. At 8 weeks, mean bone volume of the experimental group (63.21%) was higher than of the control group (62.15%), but with no statistically significant difference. These results show that NTAPPJ increased bone-implant integration at 4 weeks, earlier compared to the control group.ope

The effects of non-thermal atmospheric pressure plasma jet on implant surface in a dog model

Dept. of Dental Science/석사The purpose of this study was to investigate whether osseointegration can be improved with Non-Thermal Atmospheric Pressure Plasma Jet on SA surface implant in dogs. Implants were placed in maxilla and mandible of 6 mongrel dogs. Among the 41 SA surface implants, plasma injection was conducted on 20 implants in the experimental group, the 21 remaining non-treated implants constituting the control group. In the maxilla and mandible, 3 or 4 implants were placed, respectively. The dogs were sacrificed at either 4 or 8 weeks after implant placement. Bone volume was analyzed in a cylindrical shape determined by the 3 best threads and a circumferential zone within 50㎛ of the implant surface. A 3-dimensional bone volume analysis was conducted using micro-computed tomography and statistical analysis was performed with Wilcoxon rank-sum test. There was a statistically significant difference between the experimental and control group at 4 weeks. (p<0.05) The mean bone volume of 4 week was 57.88% (SD: 4.55) in the experimental group and 49.21% (SD: 5.75) in the control group. At 8 weeks, mean bone volume of the experimental group (63.21%) was higher than of the control group (62.15%), but with no statistically significant difference. These results show that NTAPPJ increased bone-implant integration at 4 weeks, earlier compared to the control group.ope

LDPC 부호가 적용된 무선 통신 시스템의 성능 개선을 위한 다양한 방법에 대한 연구

Thesis(doctors) --서울대학교 대학원 :전기. 컴퓨터공학부, 2009.2.Docto

(A)Study on moral education as the application of emotional intelligence

학위논문(석사)--서울대학교 대학원 :국민윤리교육과,2005.Maste

Maximum Efficiency Point Tracking (MEPT) Algorithm using Oxygen access ratio Control for Fuel Cell System

학위논문(석사) --서울대학교 대학원 :전기. 컴퓨터공학부,2010.2.Maste

전기습윤 현상을 이용한 가변초점 액체 렌즈 어레이 설계 및 제작

학위논문(석사) - 한국과학기술원 : 전기및전자공학과, 2014.8, [ vii, 60 p. ]Electrowetting is a phenomenon that can control the surface tension of liquid when a voltage is applied. This thesis introduces the fabrication method and characteristics of liquid lens array operated by the electrowetting phenomenon. The lens array chamber is fabricated by the three different methods: mold, lithography, and dry etching. IZO deposited by sputter is used as an electrode. For the dielectric layers between the two electrodes, parylene C and tantalum oxide are deposited. Parylene C known as a good moisture barrier is used to prevent water penetration and tantalum oxide(ε=23-25) with its high dielectric constant is used to minimize the increase of operating voltage.Dielectric materials are arranged as the sandwich structure where parylene C is divided into two layers and tantalum oxide is inserted between the parylene C layers. This sandwich layer prevents pinhole effect further. Hydrophobic surface which enables the range of contact angle from 60 to 160 degree is coated to maximize the effect of electrowetting, making wide band of dioptric power.Liquid injection into each lens chamber is proceeded by two different ways. First way is using self water-oil dosing that requires cosolvent and diffusion effect, while the second way is micro-syringe way using hydrophobic surface properties. After distilled water and dodecane oil the two immiscible liquids are injected into each lens of the lens array, it is sealed by IZO coated glass inside the water bath. The underwater sealing is performed using UV adhesive that does not dissolve inside water. The fabricated 23x23 lens array has 1mm diameter size with 1.6mm interval distance between adjacent lenses. Several lens characteristics including diopter, capacitance, uniformity, operating voltage, and operating temperature are measured and evaluated. The diopter of the lens is obtained by measuring focal distance when the lens is in convex state. The measured diopter is from -124 to 120.2 when voltage changes ...한국과학기술원 : 전기및전자공학과

Dynamic modeling and simulation of packed adsorption column

학위논문(석사) - 한국과학기술원 : 화학공학과, 1998.2, [ vi, 53 p. ]한국과학기술원 : 화학공학과

Full-arch accuracy of five intraoral scanners: In vivo analysis of trueness and precision

Objective: To evaluate the trueness and precision of full-arch scans acquired using five intraoral scanners and investigate the factors associated with the dimensional accuracy of the intraoral scan data. Methods: Nine adult participants (mean age, 34.3 +/- 8.3 years) were recruited. Four zirconium spheres ((sic) 6 mm) were bonded to the canines and the molars. Following acquisition of reference scans using an industrial-grade scanner, five intraoral scanners, namely i500, CS3600, Trios 3, iTero, and CEREC Omnicam, were used to scan the arches. Linear distances between the four reference spheres were automatically calculated, and linear mixed model analysis was performed to compare the trueness and precision of the intraoral scan data among the different scanners. Results: The absolute mean trueness and precision values for all intraoral scanners were 76.6 +/- 79.3 and 56.6 +/- 52.4 mu m, respectively. The type of scanner and the measured linear distances had significant effects on the accuracy of the intraoral scan data. With regard to trueness, errors in the intermolar dimension and the distance from the canine to the contralateral molar were greater with Omnicam than with the other scanners. With regard to precision, the error in the linear distance from the canine to the molar in the same quadrant was greater with Omnicam and CS3600 than with the other scanners. Conclusions: The dimensional accuracy of intraoral scan data may differ significantly according to the type of scanner, with the amount of error in terms of trueness being clinically significant