• 대한치과보철학회:학술대회논문집
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• 대한치과보철학회 1992년도 춘계학술대회
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• pp.20-21
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• 1992

• 대한치과보철학회:학술대회논문집
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• 대한치과보철학회 2001년도 추계학술대회
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• pp.26-26
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• 2001

• 대한치과보철학회:학술대회논문집
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• 대한치과보철학회 1999년도 Asian Academy of Prosthodntics. Korean Academy of Prosthodontics
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• pp.58-58
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• 1999

• 대한치과보철학회:학술대회논문집
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• 대한치과보철학회 1999년도 창립 40주년 기념 추계학술대회
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• pp.105-105
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• 1999

• 한국물환경학회지
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• 제26권2호
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• pp.303-310
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• 2010

Recently distinguished AOP means technology resolving organic compounds in water to harmless compounds such as $CO_2$ and $H_2O$ by creating OH radical ($OH{\cdot}$) with more powerful oxidation than general oxidants. It has merits which the 2nd pollution is not caused since it uses solar energy, sludge doesn't take place, it can be applied to high-density waste water and it oxidizes non-biodegradable organic compounds more easily. The purpose of the study was to examine about removable characteristics of phenol which was a non-biodegradable organic matter with UV/$O_3$/Catalyst processes which is one out of AOP and to present applicability of photocatalyst and the optimum conditions of treatment. The study regarded initial phenol concentration, initial pH, photocatalyst amount and flow as its conditions. As the results, the test had the highest removable efficiency (92%) when initial phenol concentration was 100 mg/L, initial pH 7, photocatalyst amount 6L and flow 1.5 mg/min. The removable efficiency was increased as much as initial phenol concentration was increased, when initial pH was 7 (neutrality), photocatalyst amount was increased and flow was increased. It was checked that the optimum HRT was 12 hours. Therefore, phenol is enough removable with UV/$O_3$/Catalyst process and its prospect in the future is expected.

• 대한심미치과학회지
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• 제3권1호
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• pp.32-43
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• 1995

Ni-Ti alloy has excellent corrosion resistance, biocompatibility, shape memory effect and superelasticity, so it has been used widely in biomedical fields. But it has difficulty in casting due to its high melting temperature and oxygen affinity at high temperature. Recently it has been attempted to cast Ni-Ti alloy using new casting machine and investment. The purpose of this study was to examine the superelastic behavior of cast shape memory Ni-Ti alloy and to compare the mechanical properties of the cast shape memory alloy with those of commercial alloys for removable partial denture framework. Ni-Ti alloy(Ni 50.25%, Ti 49.75% : atomic ratio) was cast with dental argon-arc pressure casting machine and Type IV gold alloy, Co-Cr alloy, Ni-Cr alloy, pure titanium were cast as reference. Experimental cast Ni-Ti alloy was treated with heat($500{\pm}2^{\circ}C$) in muffle furnace for 1 hour. Transformation temperature range of cast Ni-Ti alloy was measured with differential scanning calorimetry. The superelastic behavior and mechanical properties of cat Ni-Ti alloy were observed and evaluated by three point bending test, ultimate tensile test, Vickers microhardness test and scanning electron microscope. The results were as follows : 1. Cast Ni-Ti alloy(Ni 50.25%, Ti 49.75% : atomic ratio) was found to have superelastic behavior. 2. Stiffness of cast Ni-Ti alloy was considerably lesser than that of commercial alloys for removable partial denture. 3. Permanent deformation was observed in commercial alloys for removable partial denture framework at three point bending test over proportional limit(1.5mm deflection), but was not nearly observed in cast Ni-Ti alloy. 4. On the mechanical properties of ultimate tensile strength, elongation and Vickers microhardness number, cast Ni-Ti alloy was similiar to Type IV gold alloy, Co-Cr alloy, Ni-Cr alloy and pure titanium. With these results, cast Ni-Ti alloy had superelastic behavior and low stiffness. Therefore, it is suggested that cast Ni-Ti alloy may be applicated to base metal alloy for removable partial denture framework.

• 대한치과보철학회지
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• 제55권3호
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• pp.300-304
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• 2017

자연치열에 대합하는 완전 무치악 환자의 수복에서 임플란트를 이용한 고정성 보철물 또는 임플란트 피개의치는 좋은 치료법이다. 그러나, 완전 고정성 보철을 통한 치료는 충분한 골질, 골량이 뒷받침되어야 하기에 그 한계가 있다. 한편, 최근에는 임플란트 고정성 보철물과 함께 그것을 가철성 국소의치의 지대치로 사용하는 치료가 행해지고 있다. 본 증례보고는 자연치열에 대합되는 두 상악 완전 무치악 환자에 있어 임플란트 피개의치와 임플란트 고정성 보철물 및 가철성 국소의치를 이용한 치료 및 8년 경과관찰, 유지보수를 비교 고찰해 보고자 한다.

• 대한치과보철학회지
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• 제33권2호
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• pp.241-268
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• 1995

Splint therapy, the immobilization of teeth, has been done for patient's masticatory comforts and an adjunctive aid in periodontal therapy. Mandibular premolars are frequently splinted in many distal extension removable partial denture cases. But splinting is an extensive restoration that may not be conservative of tooth structure and may prove to be quite costly to the patient. The two dimensional finite element analysis method was used to determine the magnitude and mode of distribution of the stresses of the periodontal ligament and supporting alveolar bone when abutments with different periodontal supports were splinted and distal-extension removable partial denture was subjected to different loading schemes. The results were as follows : 1. When abutments were splinted, stresses moved from apico-distal to apico-mesial of terminal abutment on a vertical force and from disto-alveolar crest to apex on a distally directed force. But stresses were generally diminished on a mesially directed force. 2. As vertical bone loss was proceeding, most of stresses were transmitted to residual ridge and the rest of stresses were concentrated on apex of distal abutment. But these apical stresses were minimized when abutments were splinted. 3. As mesially inclined bone loss was proceeding, it seemed to be dangerous that many stresses were concentrated on the distal alveolar crest, especially in the distally directed load case. Abutments splinting decreased the alveolar crestal stresses but not enough. 4. For all vertical stresses were effectively decreased on splinting, stresses were concentrated as highly on apico-mesial area of distal abutment in distally directed load cases as the distal inclination of bone level was severe. 5. The directions and magnitudes of abutment movements were decreased with teeth splinting.

• 대한치과보철학회지
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• 제56권1호
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• pp.70-76
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• 2018

과도한 치아 마모는 수직 고경 감소를 초래하고 구강 환경과 저작계의 병적 변화를 유발할 수 있다. 수직 고경과 교합을 회복시켜주기 위해서는 정확한 진단과 분석이 필수적이다. 본 증례에서는, 75세 여성환자로 구치부 지지 상실로 인한 치아 심한 마모가 관찰되었다. 따라서 수직 고경 거상을 동반한 전악 재건 수복을 계획하였다. 정확한 임상적 방사선학적 검사, 수직 고경 평가 후 진단 납형을 제작하였고 임시보철수복을 통해 환자의 적응여부를 평가하였다. 최종 수복은 환자의 경제적 상황을 고려하여 가철성 국소의치를 제작하였으며 하악 좌우측 구치부에 임플란트를 한 개씩 식립하여 국소의치의 지지와 유지를 보강하였다. 최종 수복물 장착 후 1년 간의 경과관찰 기간 동안 기능적, 심미적으로 만족할 만한 결과를 보였다.

• 대한치과보철학회지
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• 제56권1호
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• pp.17-24
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• 2018

가철성 국소의치의 금속구조물을 제작하는 방법은 왁스 패턴을 제작하여 주조하는 lost wax technique이 주로 사용되어 왔으나, 디지털 기술의 발달로 서베잉과 금속구조물을 CAD (Computer aided design)로 디자인하여 제작할 수 있게 되었다. 여러 증례에서 CAD를 이용한 pattern의 프린팅 방식으로 얻은 레진 패턴이 구강 내에 정확하게 적합 되었고 최종 금속구조물 또한 좋은 적합도를 보였다고 보고되었다. 본 원저는 치조골 소실이 심한 상, 하악부분 무치악 환자에서 가철성 국소의치의 금속구조물을 두 가지 방식으로 각각 제작하였다. 첫 번째는 일반적인 lost wax technique과 두 번째는 CAD를 통해 pattern을 프린팅하여 금속구조물을 주조하는 방식으로 제작하여, CAD data와 fit checker를 이용해 금속구조물과 서베이드 크라운과의 유격을 측정함으로써 금속구조물의 적합도를 비교하였다. 두 가지 방식 모두 임상적으로 사용 가능한 금속구조물의 적합도를 얻었기에 이를 보고하고자 한다.