• Journal of the Korean Society for Precision Engineering
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• v.33 no.5
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• pp.377-383
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• 2016

Recently, research on bone fracture and osteoplasty using ultrasonic bone surgery unit has been ongoing in the fields of dentistry, plastic surgery, and otorhinolaryngology. However, detailed data evaluation with ultrasonic bone surgery unit has not been conducted to date. In this study, we developed handpiece moving system (HMS) for cutting performance evaluation. In the experimental setup of HMS, a handpiece was immobilized, and bone samples from cortical bone of bovine leg were prepared. Also, the experimental process was described in detail, and a basic experiment was carried out to evaluate the cutting performance. Future study is required on all experimental process conditions by HMS.

• The Journal of the Korean dental association
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• v.32 no.6 s.301
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• pp.409-416
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• 1994

이 자료는 이전에 공표 되었던 치과계에서의 감염방지 실무에 관한 CDC 권장사항을 개정한 것으로, 새로운 데이터, 재료, 기술, 및 장비 등이 반영되었다. 이러한 권장사항을 이행하면 치과 환경 내에서, 환자에서 치과의료종사자로, 치과의료종사자에서 환자로, 그리고 환자에서 환자로 질병이 전염될 수 있는 위험성을 감소시켜 줄 것이다. 이 문서에는 감염방지의 원칙에 근거하여 다음과 같은 특정 권장사항들이 서술되어 있다. 즉, 치과의료종사자들의 예방접종; 보호용 치장과 방책 기법; 수세와 손의 보호; 날카로운 기구와 바늘의 사용과 관리; 기구들의 멸균이나 소독; 치과진료대 및 주위 표면들의 세척 및 소독; 소독과 치과기공소; 치과진료대의 공기관과 수관에 연결된 핸드피스; 역류방지용 밸브; 기타 구내용 치과 장비 등의 사용과 관리; 한번 쓰고 버리는 기구; 생검 표본의 취급; 치과교육 현장에서 발치 치아를 사용하는 것; 폐기물의 폐기; 권장사항들의 이행.

• Journal of the korean academy of Pediatric Dentistry
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• v.34 no.4
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• pp.569-578
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• 2007

This study was performed to compare the shear bond strength of self etching system and two bottle bonding system with or without laser preparation. Group I was prepared with high speed rotary instrument and $Prompt^{TM}$ L-$Pop^{TM}$, group II with Er:YAG laser and $Prompt^{TM}$ L-$Pop^{TM}$, group III with Er:YAG laser, 37% phosphoric acid and Single bond, group IV with Er:YAG laser and Single bond and group V with high speed, etching and Single bond. And also observation of the prepared and etched dentin surface were performed under scanning electro-microscope. The possibility of clinical application of laser preparation which might have an advantage to reduce pain for children with less unfavorable noise were evaluated. The results obtained are as follows; 1. Group V showed significantly higher bond strength than other groups. And group IV showed significantly lower bond strength than other groups. 2. There was no significant difference between group I and group III. 3. Group II showed significantly lower bond strength than group I, III, V, but showed significantly higher bond strength than group IV. 4. Under scanning electro-microscope, laser-preparated dentin surface showed high irregularity and no smear layer. The surface showed less irregularities and more exposed dentinal tubules with etching. Laser preparation has many advantages over conventional tooth preparation. But this method showed lower resin bonding strength. Laser preparated tooth surface differed from the conventionally preparated tooth surface. More researches are needed on suitable methods for laser preparated dentin surface.

• Journal of Chest Surgery
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• v.43 no.6
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• pp.797-799
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• 2010

The pneumomediastinum after a dental treatment occurs rarely and shows almost good prognosis, however it is potentially life-threatening complication. Here we report a case of pneumomediastinum, occurred by air bubbles originated from dental high speed equipment, via head and neck fascial space with literatures review.

• 한국전산유체공학회:학술대회논문집
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• 2010.05a
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• pp.277-282
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• 2010

Imported vane type air motor and-piece is used widely in the domestic dental services. The imported hand-pieces are more than 90 percent in the domestic market. The air-motor unit of the hand-piece had not been developed inside of the country yet. Therefore it needs some research works. Purpose of this study is to design the air motor of the hand-piece for better performance. The geometry of the air-motor is based on product of NSK Company. The airflow of the air motor unit is simulated by Computational Fluid Dynamics. The performance analysis of the air motor units is investigated. ANSYS 12.0 CFX is used to analysis of the flowfield. Torque changes depends on spin calculated by the immersed solid method.

• 한국전산유체공학회:학술대회논문집
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• 2011.05a
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• pp.572-578
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• 2011

The vane type air-motor hand-piece is used widely in the dental services. There are a lot of experimental studies about air-motor but eccentrically off not many numerical studies by using Computational Fluid Dynamics. An air-motor has rotor which rotates at the center of inner housing. The retractable vanes are installed on the rotor. As the rotor of the air-motor rotates, vanes move up and down straightly in the radial direction along the guide. Therefore we have to analyze the unsteady flow field by accurate time dependent marching technique. ANSYS 12.0 CFX is used to analyze unsteady vane-motor flow field Analysis of the changing control volume inside air-motor is implemented by user-defined functions and moving mesh options. Rotational speed of the rotor is approximately 23,000rpm.

• 한국전산유체공학회:학술대회논문집
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• 2011.05a
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• pp.529-534
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• 2011

The air-motor unit of the hand-piece had not been developed inside of the country yet. Therefore it needs some research works. The objective of this study is to investigate the effect of the many mini holes at the outle of the air-motort. The flow fields analysis has been conducted by the immersed solid method using ANSYS 12.0 CFX.

• Proceedings of the KACD Conference
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• 2003.05a
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• pp.290-290
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• 2003

지난 20세기 동안, 치아 우식에 대한 치료는 G.V. Black이 제안한 '예방 확대' 개념에 따른 와동형성 원칙에 따라 외과적 치칠 삭제의 형태로 수행되어져 왔다. 즉, 치아 우식 병소에 발견되면 치과의사들은 망설임 없이 핸드 피스를 들고 우식 부위 치질을 삭제하며, 수복재료에 따라 적합한 형태로 건전한 치질을 삭제하여 수복 와동을 형성하였다. 그러나 치아 우식에 대한 많은 연구 결과, 원인균과 산 생산 및 탈회와 재석회화 등에 대한 정보가 알려졌고, 접착 수복이 비약적 발전을 하여 임상 적용이 일반화되면서, 지난 10여년 이래 치아 우식에 대한 치료 개념이 점차 최소 치질 삭제와 건전 치질 보존으로 전환되어 왔고 이러한 개념을 통칭하여 Minimal Intervention Dentistry라 하고 있다. 21세기에는 치아 우식에 대한 치료가 minimal intervention dentistry의 개념 하에 점차 폭넓게 임상에 적용될 것으로 예상되며, 다음과 같은 원칙들이 제시되고 있다.(중략)

• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.1
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• pp.13-19
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• 2017

The use of ultrasonic surgery units and scalers are steadily increasing in the field of dentistry. Such units and scalers should be evaluated before they are commercialized because the mechanical performance and stability of equipment is crucial for patients. Hence, we created a hand-piece moving system that can test bone cutting and teeth scaling. The purpose of this study was to evaluate the teeth scaling performance of ultrasonic scaler unit. Additionally, we measured the temperature distribution and noise during the test. through an experimental test, we found that a high output of an Ultrasonic NX device can cause serious damage to the teeth surface, and it was not within range in heat generation distribution and noise test.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.15 no.1
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• pp.1-7
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• 2016

In the dentistry field, an ultrasonic surgery unit is widely used in bone cutting and scaling to reduce operation time and minimize hemorrhage. The purpose of this study was to evaluate bone cutting and the effect of a specimen's temperature on the two-type ultrasonic surgery unit using a handpiece moving system(HMS). A HMS, which can cut the bone, was developed to perform the experimental procedure with precision of motion control. Bone specimens were prepared from a combination of epoxy-hardener and cortical bone of bovine leg. Through the bone-cutting experiment, the cutting depth was evaluated by not only scanning electron microscopy, but also Vernier calipers. Also, the temperature distribution was measured by a thermo-graphic camera. This study may be applied methodically in various experimental evaluations on a performance test by a HMS.