• 대한치과보철학회지
• /
• 제56권3호
• /
• pp.250-257
• /
• 2018

현재까지 의치는 전통적인 방법을 이용하여 제작하는 것이 일반적이지만, 최근 디지털 기술의 발달로 이를 이용한 의치 제작 빈도가 증가하는 추세이다. 디지털 방식을 이용하여 의치를 제작하는 방법에는 인상체를 3D 스캔하여 CAD 상에서 인공치를 배열한 뒤 이를 3D 프린팅하여 레진상 총의치를 제작하는 방식과 모델을 3D 스캔 후 CAD를 이용하여 frame-work을 디자인하고 3D 프린팅으로 resin pattern을 제작하여 이를 주조 후 금속상 총의치나 국소의치를 제작하는 방식이 대표적이다. 본 증례에서는 디지털 방식의 의치 제작 방법으로써 전자 서베잉을 이용한 진단과 CAD 프로그램을 이용한 framework 디자인, 그리고 이를 3D 프린팅 후 주조하여 상악 총의치와 하악 국소의치를 제작하였으며, 만족스러운 결과를 얻었기에 이를 보고하고자 한다.

• 대한치과보철학회지
• /
• 제37권6호
• /
• pp.819-824
• /
• 1999

The purpose of this article is to present a clinical case report for palateless complete denture. Despite the contravacy of palatal uncoverage in upper complete denture, palateless complete denture has some merits for upper edentulous patient. Following the uncovering of the palatal portion, the patient became easy to talk and restored the lost good tastes. He is happy despite of the decrease of the retention of the upper complete denture. Palateless complete denture is a compatible alternative fir upper edentulous patients in cases of gagging, large palatal torus and restoring the lost good tastes. The clinical points are as follows : 1. The remaning alveolar ridge should be ovoid and have enough width and height for the sup-port and retention. 2. The patient must have strong wish to the palateless complete denture. 3. Palatal beading made on the palatal peripheral border give good border sealing of the palatal flange and minimaized the prominence of the denture flange 4. The peripheral border of the palatal flange should be reduced as thin as possible for more comfort. 5. Upper artificial posterior teeth should be arranged over the alveolar ridge crest and inner incline of the buccal cusp relieved for denture stability while chewing. 6. For stability of palateless complete denture, bilateral balanced occlusion should be sttained. Palateless complete denture will restore the lost good tastes and more comfortable and physiologic to upper edentulous patients and a good alternative to full palatal coverage complete denture in the properly selected cases.

• Restorative Dentistry and Endodontics
• /
• 제28권1호
• /
• pp.72-79
• /
• 2003

The objective of this in vitro study was to evaluate the efficacy of a Ca(OH)$_2$removal before and after early coronal flaring using different types of instruments. 100 plastic blocks with 30$^{\circ}$artificial curved canals were used in this study and randomly divided into a control group and 4 experimental groups(GG, OS, GT, PT Group) 20 teeth each. The canals were instrumented, and Ca(OH)$_2$was temporary filled into the each canal. Irrigation was peformed with Max-i-Probe 25- 30-gauge probes before and after recapitulation. The results of this study were as follows 1. There were no significant difference among the groups in size of irrigating needle(p<0.05). 2. There was a significant difference between before and after recapitulation regardless size of irrigating needle(p<0.05). 3. Before recapitulation, there was a significant difference between 25- and 30-gauge needle in all groups(P<0.05). 4. After recapitulation, there was a significant difference between 25- and 30-gauge needle in the control group(p<0.05). But there were no significant difference among the experimental groups. It is concluded that the effectiveness of canal irrigation was decided to the depth of irrigating needle into the canal. The effect of canal irrigation tend to facilitate by the early coronal flaring. The recapitulation was the most effective during canal irrigation regardless the size of irrigating needle. Therefore, the recapitulation is a mandatory way to facilitate the effectiveness of canal irrigation during canal enlargement.

• Restorative Dentistry and Endodontics
• /
• 제22권1호
• /
• pp.193-208
• /
• 1997

Much evidence now exists from both in vivo and in vitro studies to support the claim that small caries lesions can 'heal'. But, there are still different views on the mechanism of remineralization. So in order to find the best condition for the remineralization of incipient dental caries in maximum efficient way, the author conducted the experiment which reveals the effect of pH on remineralization. 40 specimens of sound permanent teeth without demineralization or crack, $100{\mu}m$ in thickness, were immersed in lactic acid buffered demineralization solution for 4 days. Dental caries with surface zone and subsurface lesion were artificially produced. All specimens were immersed in lactic acid buffered remineralization solution of pH 4.0, 4.5, 5.0, 5.5 containg fluoride ion for 10 days. The results were obtaind by observing the specimens for every 10 days under polarized microscopy at x25. 1. Remineralization did not occur in entire depth of body of lesion at given degree of saturation and concentration of fluoride ion. 2. The pattern of remineralization has increased according to increase of pH. So it can be concluded that supersaturated solution with fluoride ion can be affected by pH in remineralization of enamel, and pH 5.5 seems to be very effective in remineralization of deep and surface zone of dental caries. However, more complex factors exist in achieving complete remineralization and further continuous researches are needed to clarify the factors.

• 한국콘텐츠학회논문지
• /
• 제13권10호
• /
• pp.427-433
• /
• 2013

삶이 풍요로워지고, 경제적인 가치가 높아짐에 따라, 미용적인 부분이 부각되어져 최근 다양한 특수한 목적을 가진 성분이 포함된 치약이 시판되고 있다. 그 중 미용과 가장 밀접한 관계를 가지는 치아미백치약의 연구 개발되었다. 본 연구에서는 미백효과를 가지는 치아미백치약을 4 주간 사용 하였을 때 치아의 색변화, 법랑질 표면에 미치는 영향을 비교 분석하고자 한다. 미백치약의 사용에 따라 미백이 이루어지는 것을 알 수 있었으며, 4주간 반복 적용을 통하여 일반치약에 비하여 색변화가 약 2.3배 높은 수치를 보이는 것을 관찰하였다. 또한, 치아의 미세경도의 수치는 영향을 미치지 않는다는 것을 확인하였다. 이는 누구나 보다 쉽게 일상생활에서 미백효과를 나타내기 위하여 미백치약으로 잇솔질을 수행함으로써 미용 기능을 증진을 이끌 수 있는 방법으로 사료된다.

• 대한치과기공학회지
• /
• 제39권1호
• /
• pp.25-33
• /
• 2017

Purpose: The aim of this study was to evaluate accuracy of glass fiber mesh complete denture of before and after curing. Methods: Edentulous model was selected as the master model. Ten study models were made by Type IV stone. Wax complete dentures were produced by the denture base and artificial teeth. CD and GD groups were measured six measurement distance before curing. The wax complete denture was investment after measurement is completed. Using a heat polymerization resin was injected resin. After injecting the resin it was curing. A complete denture was re-measured after curing. The measured data was verified by paired t-test. Results: Overall CD group was larger the value of the measured length. In the CD group, A-D point was larger. The smallest point was the B-D point. However, there was no statistically significant difference only C-D point(p>0.05). In the GD group, A-B point was larger. but B-D point was the smallest. A-D and B-C statistically points showed significant differences(p<0.05). Conclusion: Glass fiber mesh resin complete denture can be clinically applied to the edentulous patient.

• Imaging Science in Dentistry
• /
• 제33권1호
• /
• pp.27-33
• /
• 2003

Purpose : The purpose of this experiment was to evaluate the diagnostic ability of a CCD-based digital system (CDX-2000HQ) in the detection of incipient dental caries. Materials and Methods : 93 extracted human teeth with sound proximal surfaces and interproximal artificial cavities were radiographed using 4 imaging methods. Automatically processed No.2 Insight film (Eastman Kodak Co., U.S.A.) was used for conventional radiography, scanned images of conventional radiograms for indirect digital radiography were used. For the direct digital radiography, the CDX-2000HQ CCD system (Biomedisys Co. Korea) was used. The subtraction images were made from two direct digital images by Sunny program in the CDX-2000HQ system. Two radiologists and three endodontists examined the presence of lesions using a five-point confidence scale and compared the diagnostic ability by ROC (Receiver Operating Characteristic) analysis and one way ANOV A test. Results: The mean ROC areas of conventional radiography, indirect digital radiography, direct digital radiography, and digital subtraction radiography were 0.9093, 0.9102, 0.9184, and 0.9056, respectively. The diagnostic ability of direct digital radiography was better than the other imaging modalities, but there were no statistical differences among these imaging modalities (p > 0.05). Coclusion : These results indicate that new CCD-based digital systems (CDX-2000HQ) have the potential to serve as an alternative to conventional radiography in the detection of incipient dental caries.

• 대한소아치과학회지
• /
• 제29권1호
• /
• pp.84-91
• /
• 2002

연구 목적은 시중 음료의 산성도를 조사하고 산성 음료가 유치 법랑질의 침식에 미치는 영향 및 침식된 법랑질에 대한 인공 타액과 불소의 재광화 효과를 연구하는 것이었다. 시중의 25 종류의 음료를 표집한 후 pH를 측정하였고, 표면미세경도측정법으로 유치 법랑질의 침식 및 재광화 실험을 시행하였다. 음료의 pH는 대부분의 음료가 pH 5.5이하였다. 산성 음료에 의한 유치 법랑질 표면미세경도의 감소율은 착향탄산음료의 경우 5분 후가 16.90%, 10분 후가 25.11%, 30분 후가 35.10%, 60분 후가 41.62%이었고, 재광화용액에 담갔을 때 표면미세경도의 회복률은 1시간 후에 61.52%, 24시간 후에 67.96%, 48시간 후에 72.13%, 72시간 후에 75.93%이었다. 결과는 시중 음료의 대부분이 산성 음료이며 치아침식증의 발생은 빠르게 일어나는 반면에 재광화는 상대적으로 느리게 일어난다는 것을 시사하고 있다.

• 재활복지공학회논문지
• /
• 제4권1호
• /
• pp.29-34
• /
• 2010

완전 이식형 보청기는 기존 보청기가 가지고 있는 여러 문제점들을 해결하기 위해 연구 개발되고 있다. 이러한 완전이식형 보청기에 사용되는 이식형 마이크로폰은 일반적으로 측두부의 피부아래 이식된다. 그런데 이식된 마이크로폰의 특성은 음식을 먹거나 치아의 마찰, 생체동잡음에 의해 영향을 받을 수 있다. 본 논문에서는 이식된 마이크로폰에 골전도를 통해 전달된 생체잡음신호가 미치는 영향을 조사하기 위하여, 사람의 측두부 및 피부의 특성이 유사한 물리모델을 제작하여, 이식된 마이크로폰의 감도측정실험을 수행하였다. 1 kHz의 순음신호를 이식된 마이크로폰에 인가하고, 동시에 여러 주파수대의 정현파진동을 인공뼈에 인가하여 측정되었다. 그 결과 마이크로폰의 출력은 골전도를 통한 신호의 영향을 받아 왜곡될 수 있으며, 그 영향은 주파수대역에 따라 달라짐을 확인하였다.

• 대한치과보철학회지
• /
• 제32권4호
• /
• pp.593-607
• /
• 1994

The purpose of this study is to evaluate the effect of the bone morphogenetic protein, bone matrix gelatin and collagen matrix on the amount and shape of generating new bone adjacent to the implant. Implants were inserted in the mandible of adult dogs at 2 months after teeth extraction. Artificial bony defects, 3mm in width and 4mm in depth were made at the mesial and distal side of implant. Experimental groups were divided into three groups ; Group 1 : Defects filled with collagen matrix and bone morphogenetic protein, Group 2 : Defects filled with bone matrix gelatin. Control group : Defects filled with only collagen matrix. After implantation, the animals were sacrificed at 1,3,5 and 10 weeks for light microscopic examination. For the fluorescent microscopic examination. each tertracycline Hcl and calcein were injected at 1, 3, 5, 8 and 10 weeks after implantation. The results obtained were as follows : 1. The molecular weight of bovine BMP was about 18,100 by hydroxyapatite chromatography. 2. Osseointegration was observed in experimental groups 1 & 2, and BMG and BMP had an excellent bone forming capability as a filling materials to the repair of the bone defects. 3. The degree of healing of bone defect area, the experimental group 1 showed more prominent bone formation than control group, and the control group showed fibrous connective tissue between the implant and the bone. 4. In the fluorescent microscopic findings, bone remodelling was observed regenerative lamellar bone at defect area in experimental group 1, and partial remodelling in experimental group 2, In the control group, fibrous connective tissue was observed between the implant and bone surface and sign of remodelling was not apperaed. Above results suggest that BMP has rapid osteoinductive property and can be used clinically as a bone substitute on bone defects around implants.