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지대주 나사 조임 토크가 맞춤형 지대주 임플란트 시스템의 연결부 안정성에 미치는 영향: 3차원 유한 요소 해석
홍민호,Hong, Min-Ho 대한치과기공학회 2021 대한치과기공학회지 Vol.43 No.3
Purpose: This study aims to examine the stress distribution effect of tightening torques of different abutment screws in a custom-abutment implant system on the abutment-fixture connection interface stability using finite element analysis. Methods: The custom-abutment implant system structures used in this study were designed using CATIA program. It was presumed that the abutment screws with a tightening torque of 10, 20, and 30 N·cm fixed the abutment and fixture. Furthermore, two external loadings, vertical loading and oblique loading, were applied. Results: When the screw tightening torque was 10 N·cm, the maximum stress value of the abutment screw was 287.2 MPa that is equivalent to 33% of Ti-6Al-4V yield strength. When the tightening torque was 20 N·cm, the maximum stress value of the abutment screw was 573.9 MPa that is equivalent to 65% of Ti-6Al-4V yield strength. When the tightening torque was 30 N·cm, the maximum stress value of the abutment screw was 859.6 MPa that is similar to the Ti-6Al-4V yield strength. Conclusion: As the screw preload rose when applying each tightening torque to the custom-abutment implant system, the equivalent stress increased. It was found that the tightening torque of the abutment influenced the abutment-fixture connection interface stability. The analysis results indicate that a custom-abutment implant system should closely consider the optimal tightening torque according to clinical functional loads.
홍민호 ( Min-ho Hong ),김만기 ( Man-gi Kim ),구병수 ( Byung-su Koo ),김근우 ( Geun-woo Kim ) 대한한방신경정신과학회 2020 동의신경정신과학회지 Vol.31 No.4
Objectives: The aim of this study was to review the research trends in the treatment of pharmacopuncture for vascular dementia in Traditional Chinese medicine. Methods: We searched for articles in the China National Knowledge Infrastructure (CNKI) database from January 2000 to August 2020. Results: Among the total 63 articles, 9 articles were selected. All studies were randomized controlled trial studies. The Diagnostic and Statistical Manual of Mental Disorders (DSM) was most frequently used as diagnostic criteria. Effective rate and Activity of Daily Living (ADL) were most commonly used as outcome measurements. Angelica gigantis Radix (當歸), Salvia miltiorrhiza Bunge (丹蔘), and Astragali Radix (黃芪) were the most commonly used ingredients in pharmacopuncture. Joksamni (ST36) and Sinsu (BL23) were the most commonly used acupoints for pharmacopuncture treatment. Based on the Risk of Bias (RoB) of these 9 articles, the overall quality of studies was low. Conclusions: Pharmacopuncture could be considered for the treatment of vascular dementia. In the future, various systematic studies on dementia are needed.
홍민호 ( Min-ho Hong ),구병수 ( Byung-su Koo ),김근우 ( Geun-woo Kim ) 대한한방신경정신과학회 2020 동의신경정신과학회지 Vol.31 No.1
Objectives: The purpose of this study was to review the research trends in the treatment on narcolepsy in traditional Chinese medicine. Methods: We searched articles in the China National Knowledge Infrastructure (CNKI) October 2009-September 2019. Keywords were 发作性睡病, 嗜睡病, and 嗜睡症. Results: Among a total of 81 articles, 12 articles were selected. The International Classification of Sleep Disorders was most frequently used as a diagnostic criteria. Feng Chi (GB20) and Baek Hoi (GV20) are the most commonly used acupoints in acupuncture treatment. Glycyrrhizae Radix (甘草), Atractylodis Rhizoma Alba (白朮), and Poria (Hoelen) (茯苓) are the most commonly used preparations in herbal medicine. The effective rate is most commonly used as an outcome measurement. Conclusions: Acupuncture and herbal medicine could be considered to improve the symptoms of narcolepsy. In the future, this study could be primary data for the development of more clinical research on the treatment on narcolepsy in Korean medicine.