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상아질 표면 처리 방법에 따른 Compomer의 전단 결합 강도
오영학,홍찬의 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.2
The purpose of this study was to evaluate the shear bond strength of compomers according to dentin surface treatment. Two materials of compomer were devided into six groups. The compomer used in this study were Dyract AP(D) and F2000(F). Group 1 (DN) and 4(FN) were treated according to manufacturers instructions as control groups. Group 2(DE) and 5(FE) were treased with 37% phosphoric acid and group 3(DA) and 6(FA) were treated with air abrasion unit (80 psi, 50 m aluminum oxide particles) respectively as experimental groups. After dentin surface treatment, compomers were bonded. Completed samples were stored in 100 % humidity, 37C during 7 days. and then, the shear bond strength of specimens were evaluated. The results were as follows : 1.In the case of Dyract AP, the shear bond strength was showed the highest value of 9.10 MPa in dentin surface treatment with air abrasion unit, but there were no significant differences to the other groups. 2.In the case of F2000, the shear bond strength was showed the highest value of 13.51MPa and there were significant differences to the other groups (p<0.05). 3.The shear bond strength of F2000 was higher than Dyract AP in each dentin surface treatment, and in the case of etching and air abrasion, there were significant differences(p<0.05). 4.As a result of observation of SEM, the most of fracture pattern was adhesive failure in group 1(DN), 2(DE) and 4(FN), and cohesive failure in group 3(DA), 5(FE) and 6(FA).
디자인 중심 다학제 수업에서 코디네이터의 역할 : ‘근미래 모바일 라이프 연구’ 산학수업의 사레연구
오영학(Younghak Oh),라웅배(Woongbae Ra),이순종(Soonjong Lee) 한국디자인학회 2010 한국디자인학회 학술발표대회 논문집 Vol.2010 No.10
There are many students from many kinds of majors in multidisciplinary classes of university. Students have each other majors and they have different domain and context for understanding and solving problems. In these classes mutual understanding between students is the most important to solve the goal of class. We analyze our case study on 'Future Mobile Life' class and research how to develop and evaluate process and result. Team values are shown by variable forms. Some students show unsuspected ability in the course. And it is discovered that team coordinator's roll is very important against the teaching staffs' expectation.
하명신,오영학 한국국제상학회 2003 國際商學 Vol.18 No.1
this paper aims to identify critical logistics activity factors for logistics performance and suggest the improvement of logistics performance for korean firms that have adopted the third party logistics(TPL) system. the survey was conducted by the questionnaires compounded with 9 logistics activity variables and 2 logistics performances for 40 korean firms. the methodology used are composed of frequency, reliability, factor and regression analysis to find out major factors on logistics performance. the result shows that the performance of the TPL system was rather optimistic in the improvements of customer service and the reductions of logistics costs.
발치 후 즉시 매식된 서로 다른 두종의 RBM표면 처리된 임플란트에 대한 다기관 후향적 임상연구
박홍주,국민석,김수관,김영균,조용석,최갑림,오영학,오희균,Park, Hong-Ju,Kook, Min-Suk,Kim, Su-Gwan,Kim, Young-Kyun,Cho, Yong-Seok,Choi, Gab-Lim,Oh, Young-Hak,Oh, Hee-Kyun 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.3
Purpose. This multicenter retrospective study was performed to evaluate the survival and success rates of immediate placement of USII and SSII Osstem implant (Osstem implant Co, Korea) on the maxillary and mandibular anterior and premolar areas. Materials and methods. Dental records were obtained in 37 patients who were treated with immediate implantation on the maxillary and mandibular anterior and premolar areas in 6 different clinics. The 98 implants were evaluated both clinically and radiographically using predefined success criteria. Results. There was no failed implant in all patients. The mean follow up period was 24.7 months (ranged from 12 to 58 months), and 25.1 months (ranged from 16 to 35 months) in USII and SSII implants, respectively. The crestal bone loss was 3 mm in 3 USII implants during 41 months, and in 1 SSII implant during 22 months. The overall success rate was 94.2% and 97.7% in USII and SSII implants, respectively. The age, gender, diameter, or length of implants, and type of surgery were not influenced to the success rate of immediate implantation. Conclusion. These results suggest that USII and SSII Osstem implant can be used successfully in immediate implantation on the maxillary and mandibular anterior and premolar areas.