연조직심미와 치주치료

정회웅,Jeong, Hoe-Ung 대한심미치과학회 2005 Journal of the Korean Academy of Esthetic Dentistr Vol.14 No.2

Easy GBR with Collagen Membrane in Implant surgery

정회웅 대한치과재료학회 2008 대한치과기재학회 학술대회 Vol.2008 No.5

접근이 곤란한 하악 견치 3급 와동 우식에 있어서 교정장치 MTA와 직접치수복조술을 통한 최소 침습적 치료 증례 보고

정회웅,정자실 대한통합치과학회 2019 대한통합치과학회지 Vol.8 No.1

Deep caries treatment requires more and more considerations as modern dentistry has evolved to "minimally invasive" approach in which focus is on maximum conservation of healthy, natural tooth structure and preservation of tooth vitality. Deep caries, those with a lesion that reaches close to the pulp space on the radiograph, can be treated with either crown incorporated with endodontic treatment or direct restoration preserving pulp vitality as much as possible. In this case report, to approach deep caries with the minimally invasive concept, inaccessible class Ⅲ cavity of lower left canine was treated with direct pulp capping and direct restoration after regaining the interdental space through a mini-tube appliance(orthodontic MTA). In addition, the aims of this report are to discuss the efficacy of direct pulp capping(DPC) in vital permanent teeth with cariously exposed pulp and a better way to excavate deep caries to decrease the risk of pulp exposure. 깊은 우식의 치료는 치과학이 건강하고 자연적인 치아구조와 치아 생활력을 최대한 보존하고자하는 “minimally invasive dentistry"로 발전함에 따라 더 많은 고민을 필요로 한다. 방사선학적으로 치수에 근접한 깊은 우식은 신경치료를 동반한 전장관으로 해결하거나 최대한 치수 생활력을 보존하고 직접 수복으로 치료할 수 있다. 본 증례 보고에서는 접근이 어려운 하악 좌측 견치의 원심 치경부 우식을 "minimally invasive dentistry"의 개념에 따라 접근하기 위해 교정장치 MTA를 이용한 하악 부분교정을 동반하여 상실된 치간 공간을 재확보하고 직접치수복조와 직접 수복으로 해결하였다. 이에 더해, 본 증례보고에서는 우식으로 인해 치수가 노출된 생활영구치에서 직접치수복조의 효용성과 치수 노출 위험을 줄이기 위한 보다 나은 우식 제거 방법에 대해 논하고자 한다.

티타늄 임플란트의 수산화칼륨 처리가 인산칼슘의 석출 및 조직적합성에 미치는 영향

정회웅,원대희,배태성,이민호 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.3

This study was performed to examine whether the precipitation of calcium phosphate and tissue compatibility of titanium implant are affected by the surface modification of potassium hydroxide treatment. Titanium plates of 10×10×1 mm in dimensions were polished sequentially from #600 to #2,000 emery paper and one surface of each specimen was received an additional polioshing sequence through 0.1㎛ alumina paste. Specimens were soaked in 0.1∼10.0 M KOH solutions at 60℃ for 24 hours and 5.0 M KOH-treated group was heated at 400∼800℃ for 1 hour. All specimens were soaked in the Hanks' solution with pH 7.4 at 36.5℃ for 30 days, and the surfaces were examined with X-ray diffractometer, scanning electron microscope (SEM) and X-ray photoemission spectroscopy (XPS). To evaluate the tissue compatibility of KOH-treated titanium, STS316L, untreated titanium and KOH-treated titanium were implanted into abdominal connective tissue sites of rats for 3 months. After removing the implants, abdominal tissue sites were fixed and prepared histologically for microscopic observation. It was characterized by the presence of connective tissue with fibrous capsule surrounding the implant and macrophages. Potassium titanate hydrogel layer, which can accelerate the formation of bonelike apatite layer on titanium surface, was obtained with the immersion in KOH solution. Precipitation of calcium phosphate on titanium surface was densified with the immersion in 5.0M KOH solution and heat treatment at 600℃. Number of macrophages in connective tissue site of 0.95 mm2, which is known to increase with the inflammation reaction proceeds, was significantly decreased as the alkali & heat treatment of titanium surface (p<0.01). The thickness of the fibrous capsule formed around the implant body was significantly decreased with the alkali and heat treatment of titanium surface (p<0.01).

티타늄 임플랜트의 표면 마무리 상태 및 NaOH 수용액 침적이 유사체액 중에서의 인산칼슘 석출에 미치는 영향

정회웅,최규형,이민호,배태성 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.3

The purpose of this study was to examine whether the precipitation of calcium phosphate on titanium implant are affected by surface modification. To improve the bone conductivity of the Cheil implant(Cheil Pharma & Instrument Inc), samples were divided into 3 groups. Group 1 was untreated, group 2 was immersed in 5M-NaOH solution at 60℃ for 24 hours, and group 3 was immersed in 5M-NaOH solution at 60℃ for 24 hours and heat-treated at 600℃ for 1 hour. And then, all specimens were immersed in the MEM Eagle's medium whose composition was similar to that of extracellular fluid for 30 days. After immersion, the surfaces were observed with scanning electron microscope. The results obtained were summarized as follows; 1. The surface of Branemark implant showed more regular and smooth machined surface than that of Cheil implant. 2. The precipitation of the calcium phosphate on implant surface was increased by the immersion in the NaOH solution, and more highly accelerated by heat treatment. 3. The precipitation of the calcium phosphate on titanium implant was lower than that on the polished titanium surface.

티타늄의 NaOH 수용액 침적 및 열처리가 유사체액 중에서의 인산칼슘 석출에 미치는 영향

최진용,정회웅,이민호,배태성 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.4

This study was performed to examine whether the precipitation of calcium phosphate on titanium surface is affected by the immersion in NaOH solution and heat treatment. Titanium plates of 10×10×1㎜ in dimensions were polished sequentially from #240 to #2,000 emery paper and one surface of each specimen was received an additional polishing sequence through 0.1㎛ alumina paste. Polished specimens were soaked in 1, 3, 6, 10M-NaOH aqueous solutions at 60℃ for 24 hrs, and 6M-NaOH-treated group were heated to 400, 600, 800℃ for 1 h. After the alkali treatment in the NaOH aqueous solution and heat treatment, specimens were soaked in the Hanks solution with pH 7.4 at 36.5℃ for 7 days in the NaOH-treated groups and for 30 days in the NaOH and heat-treated groups. The results obtained were summarized as follows; 1. The precipitation of calcium phosphate on titanium was accelerated by the immersion in NaOH solution and heat treatment. 2. The precipitation of calcium phosphate was densified with the increase of molar ratio of NaOH. 3. The heat-treated titanium surface at 600℃ showed the precipitation of dense and fine apatite crystals.

압자의 압입에 의한 치관용 복합레진의 기계적 성질 평가

배태성,강동진,정회웅,최원호 대한치과기재학회 2000 대한치과재료학회지 Vol.27 No.1

치아가 상실된 경우 보철치료는 형태적 및 기능적 수복을 목적으로 행하여져 왔지만, 최근 심미적 수복에 대한 욕구가 증가하면서 전치부 뿐만아니라 구치부에도 적용이 가능한 치관색 보철재료에 관심이 집중되고 있으며, 여러 종류의 무기재료, 유기재료 및 이들의 복합재료가 개발되어 임상에서 이용되고 있다. 강화된 치관용 복합레진의 기계적 성질을 평가하기 위해 여러 가지의 강도 측정법이 도입되었지만, 미소한 표면층의 물성변화를 비파괴적인 방법으로 측정한 연구는 거의 이루어지지 못하였다. 이에 본 연구에서는 물성변화를 비파괴적인 방법으로 측정한 연구는 거의 이루어지지 못하였다. 이에 본 연구에서는 구강환경과 유사한 액상의 조건에서 임상에서 이용되고 있는 치관용 복합레진의 기계적 성질을 평가하기 위해, 미소표면 재료특성평가 시스템을 이용하여 시료의 미소표면에 대한 경도 및 압입과정에서 일어나는 흐름성과 영구변형을 비교하였으며, 그 결과를 임상적용 과정에서 재료의 선택기준으로 제시하고자 한다.

전부도재관용 도재의 미시적 균열전파 양상

김효성,최규형,정회웅,원대희,이민호,배태성 대한의용생체공학회 1998 의공학회지 Vol.19 No.5

This study was performed to evaluate the effects of surface flaw on the fracture of all-ceramic materials. A feldspathic porce lain of VMK68, a cashable ceramic of IPS-Empress, and an alumina-glass composite of In-Ceram were used. Specimens were prepared as 12$\times$3$\times$1mm in dimensions, and a Vickers-produced indentation crack was made at the center of the tensile surface. Test specimens were immersed in dlstilled water and In oil, which were broken under a crosshead speed of 0.05 mm/min by 3-point bend test at 37$^{\circ}C$. The characteristic patterns of Vickers indentation and fracture surfaces were examined by an optical microscope and a scanning electron microscope. The fracture surfaces of the VMK68 and the IPS-Empress showed a median crack pattern at the fracture origin and indicated a tendency to cleavage hackle. The fracture surface of the alumina-glass composite, In-Ceram, showed a Palmqvist crack pattern at the fracture origin and indicated a tendency of toughening by the frictional Interlocking between the microstructurally rough fracture surfaces. 본 연구에서는 전부도재관용 도재의 균열전파 양상과 구강환경이 파절강도에 미치는 영향을 평가하기 위해 시행되었다. 도재의 굽힘강도 늘 In-Ceram, IPS-Empress 및 VMK68의 순으로 나타났으며, 수중에서 좌다 기름중에서 더 놀은 강도를 보였다. 비커스 압자 압입부와 압입부를 중심으로 한 파면의 관찰 결과, VMK68 도재의 경우에는 9.8N의 압인하중하에서, IPS-Empress의 경우에는 47.0N의 압입하중하에서 교면에 median crack이 형성되는 양상을 보였으며, 균열이 압자의 압입시에 형성된 벽개면을 따라서 빠르게 성장하여 파괴에 도달한 양상을 보였다. In-Ceram의 경우에는 49.0h의 압임하중하에서 Palmqvlst clack이 형성되는 양상을 보였으며, 알루미나 입자에 의한 균열의 굴곡과 creak bridging으로 인한 강화기전이 관찰되었다.

압자의 압입에 의한 치관용 복합레진의 기계적 성질 평가

최원호,강동진,정회웅,배태성 대한치과재료학회 2000 대한치과기재학회 학술대회 Vol.2000 No.1

실내 스포츠 환경의 재실자 안전관리를 위한 데이터셋 구축 및 음성-텍스트 변환 프로토타입 개발

문영백(Moon Young Bag),정훈(Jeong Hoon),허태욱(Huh Tae Wook),정회웅(Jeong Hoe Woong),김학철(Kim Hak Cheol) 한국통신학회 2020 한국통신학회 학술대회논문집 Vol.2020 No.11