• Journal of Radiation Protection and Research
• /
• 제25권1호
• /
• pp.45-51
• /
• 2000

본 연구의 목적은 마우스 주요 조직내의 방사성수은 침착을 알아보기 위하여 실험을 하였다. 건강한 ICR계 수컷 마우스를 사용하였고 두 개의 실험군을 설정하였다. 실험군은 방사성수은(0.005 uCi/b.w.)을 단독처치하고 스쿠알렌(200mg/kg)을 1일 2회씩 구강 처치하였다. 대조군은 실험군과 동일한 방법으로 방사성수은만 단독처치 하였다. 결과적으로 주요 침착 장기는 신장, 간, 혈액, 심장, 두개골이었다. 대조군의 경우 모든 장기에서 6시간째에 가장 높은 방사성수은 침착을 보였으나, 스쿠알렌을 처치한 실험군의 경우는 6시간째에 방사성침착이 유의하게 억제됨을 관찰 할 수 있었다(p<0.05). 결론적으로, 스쿠알렌이 방사성수은의 조직 침착을 억제시키는데 효과가 있는 것으로 사료된다.

• The Journal of Advanced Prosthodontics
• /
• 제10권6호
• /
• pp.430-439
• /
• 2018

The treatment of craniofacial anomalies has been challenging as a result of technological shortcomings that could not provide a consistent protocol to perfectly restore patient-specific anatomy. In the past, wax-up and impression-based maneuvers were implemented to achieve this clinical end. However, with the advent of computer-aided design and computer-aided manufacturing (CAD/CAM) technology, a rapid and cost-effective workflow in prosthetic rehabilitation has taken the place of the outdated procedures. Because the use of implants is so profound in different facets of restorative dentistry, their placement for craniofacial prosthesis retention has also been widely popular and advantageous in a variety of clinical settings. This review aims to effectively describe the well-rounded and interdisciplinary practice of craniofacial prosthesis fabrication and retention by outlining fabrication, osseointegrated implant placement for prosthesis retention, a myriad of clinical examples in the craniofacial complex, and a glimpse of the future of bioengineering principles to restore bioactivity and physiology to the previously defected tissue.

• Asian-Australasian Journal of Animal Sciences
• /
• 제33권4호
• /
• pp.588-596
• /
• 2020

Objective: The objective of this study was to investigate the effects of low doses of organic trace minerals (iron, copper, manganese, and zinc) on productive performance, egg quality, yolk and tissue mineral retention, and fecal mineral excretion of laying hens during the late laying period. Methods: A total of 405 healthy hens (HY-Line White, 50-week-old) were randomly divided into 3 treatments, with 9 replicates per treatment and 15 birds per replicate. The dietary treatments included feeding a basal diet + inorganic trace minerals at commercial levels (CON), a basal diet + inorganic trace minerals at 1/3 commercial levels (ITM), and a basal diet + proteinated trace minerals at 1/3 commercial levels (TRT). The trial lasted for 56 days. Results: Compared to CON, ITM decreased (p<0.05) egg production, daily egg mass, albumen height, eggshell strength, yolk Fe concentration, serum alkaline phosphatase activity and total protein, and increased (p<0.05) egg loss and feed to egg ratio. Whereas with productive performance, egg quality, yolk mineral retention, and serum indices there were no differences (p>0.05) between CON and TRT. The concentrations of Fe and Mn in the tissue and tibia were changed notably in ITM relative to CON and TRT. Both ITM and TRT reduced (p<0.05) fecal mineral excretion compared to CON. Conclusion: These results indicate that dietary supplementation of low-dose organic trace minerals reduced fecal mineral excretion without negatively impacting hen performance and egg quality.

• 대한치과교정학회지
• /
• 제14권1호
• /
• pp.65-81
• /
• 1984

In order to observe the responses of the periodontal tissue on the tension side following the experimental tooth movement, 35 Guinea pigs were divided into the control group (5 animals) and 6 experimental groups (3 movement groups and 3 retention groups) consisting of each 5 animals. The experimental tooth movement of Guinea pig's upper incisors installing open helical loop were carried out by rendering continuous force : 5g (1st groups) 35g (2nd groups), 100g (3rd groups), respectively for 7 days. 3 movement groups (15 animals) were sacrificed soon after the continuous force, and 3 retention groups (15 animals) were sacrificed after the retention period of another 7 days. The following results were obtained from the observation of the surrounding tissues of teeth on the tension side through light microscopy any transmission electron microscopy. 1. The vessel walls in the experimental groups were thinner than those of the control group, the number of blood vessel had the tendency to increase. The greater the strong force applied to each group, the more the destruction of cells and fibers was found and the more the number of the red blood cell of vessel outside appeared. 2. New collagen fibers were produced from fibroblasts in the 1st groups (light force), but were produced rather less in the 2nd groups (medium force) and the 3rd groups (heavy force). 3. In the forming patterns of the new alveolar bone of the 3rd groups (heavy force), the bone trabeculae were formed towards the direction of the force to be applied, but the new alveolar bone in the 1st groups (light force) was produced evenly throughout the all surfaces of the alveolar bone rather than the patterns of bone trabeculae ; therefore, the patterns of new alveolar bone were observed differently according to the magnitude of the force applied. 4. In the retention group, it was observed that the collagen fibers were produced from the osteoblasts in the marginal areas of the periodontal ligaments being widely opened and were deposited on the alveolar bone surface but the production of collagen fibers from the osteoblasts in the other area of the periodontal ligaments was almost ceased, and a rest line on the new alveolar bone surface was found.

• 대한소아치과학회지
• /
• 제36권3호
• /
• pp.420-426
• /
• 2009

본 연구의 목적은 유치열기 3급 부정 교합 환아에서 facemask를 이용한 악정형 치료 후 골격적 변화와 치료 후 나타나는 재발 양상을 평가하는 것이다. 유치열기 3급 부정교합 환아 15명을 대상으로 구내장치로 bonded expander, 구외장치로 facemask를 이용한 악정형 치료를 평균 12 개월 동안 시행하였으며, 1년 간의 follow-up 기간 동안 유지 장치는 사용되지 않았다. 치료 시작 전, 치료 직후, 치료 1년 후에 측면두부방사선사진을 촬영하고 전후방 및 수직적 골격관계와 연조직의 변화를 비교분석하였다. 모든 환아에서 치료 직후, 유의할 만한 골격적 전후방 관계의 변화를 보였고 1년 간의 follow-up 기간 동안 재발되는 경향을 보였으나 치료 시작 전과 비교하여 치료 효과는 유지되었다. 수직적 골격적 변화는 치료 직후 증가되었으나 1년 간의 follow-up 기간 동안 다시 감소하여 치료 시작 전과 비교하여 차이를 보이지 않았다. 연조직의 변화는 facial convexity 및 상순의 위치가 치료 직후 개선됨을 보였고 1년 간의 follow-up 기간 동안에도 치료 전과 비교하여 치료효과는 유지되었다. 하순의 위치는 치료 직후에 유의할 만한 변화를 보이지 않았다. Facemask는 유치열기 3급 부정교합에 있어서 효과적인 치료 방법이며, 안정적인 치료 결과를 위해서는 적절한 형태의 유지장치가 고려되는 것이 바람직하다.

• Journal of Periodontal and Implant Science
• /
• 제34권3호
• /
• pp.647-657
• /
• 2004

A non-carious cervical lesion(NCCL) is the loss of tooth structure at the cementoenamel junction level that is unrelated to dental caries. This study was to evaluate the occlusal and periodontal status of teeth with non-carious cervical lesions. We evaluated 105 teeth with non-carious cervical lesions in 35 subjects aged 38-75 years and characterized them based on the shape and dimension, plaque retention, bleeding on probing(BOP), probing pocket depth(PPD), occlusal status, brushing type, hypersensitivity and wear facet. The results of this study were as follows 1. No significant association was observed between cervical lesions and occlusal contact in lateral excursions. 2. No significant difference occurred in plaque retention, PPD, BOP between teeth with and without cervical lesions. 3. Test teeth had a significantly higher percentage of hypersensitivity and occlusal wear facet than teeth without cervical lesions. 4. Wedge shaped lesions had a significantly higher percentage of plaque than saucer shaped lesions. 5. Teeth with plaque were found to have significantly deeper PPD than teeth without plaque retention in cervical regions. 6. Teeth with occlusal contacts were found to have significantly deeper PPD than teeth without occlusal contacts. 7. No significant association was observed between cervical lesions and PPD independent of plaque retention and occlusal contacts Although more knowledge is necessary, our results suggest that occlusal contact and bacterial plaque may influence on periodontal tissue, but NCCL is not directly associated with periodontal health

• 구강회복응용과학지
• /
• 제16권2호
• /
• pp.123-132
• /
• 2000

The field of maxillofacial prosthetics is concerned with the prosthetic reconstruction of missing head and neck tissue. Currently, facial prostheses are usually applied in cases of defects caused by the surgical removal of tumors or congenital defects. While silicone has been most widely used for the reconstruction of missing maxillofacial defects, it does not have ideal physical properties. Therefore, bonding a thin polyurethane sheet to silicone prostheses was recommended. In this case skin adhesives were used for the retention of maxillofacial prostheses. But retention of devices has always been problematic. The contributions of implants can be made to solve these problems. Implants have reduced the need for adhesive use, simplifying cleaning procedures and thus extending the life of the prostheses. For implant-retained prostheses, retentive matrix is necessary to hold attachments and/or magnets. The retentive matrix is usually fabricated with autopolymerizing acrylic resin or visible light- polymerized resin. The purpose of this study was to compare the adhesion-in-peel force of silicone adhesive to autopolymerizing acrylic resin and polyurethane sheet with two different surface textures : pumice polish only or retention groove, and three surface primers : Dow corning 1205 primer or Dow corning S-2260 primer or FactorII A-304 primer, and two polymerization methods : room temperature or dry heat oven. The t-peel bond strength of specimens was determined as described in ASTM Standard D1876-72. The results were statistically analyzed using the ANOVA test, multiple range test and t-test The results were as follows. 1. The t-peel bond strength of A-304 primer was the highest and statistically higher than that of S-2260(p<0.05). 2. The t-peel bond strength of specimens with retention groove was statistically higher than that of specimens polished with pumice(p<0.05). 3. The t-peel bond strength of specimens polymerized in dry heat oven was statistically higher than that of specimens in room temperature(p<0.01).

• 대한치과기공학회지
• /
• 제14권1호
• /
• pp.133-138
• /
• 1992

The base of a metal base denture that is made of acrylic resin base and metal in lined by soft liner named silicon rubber and its merits are as follows. 1. It has a good retention and fastness. 2. It has a good comfort and stability. 3. It is easy to mix various kinds of base materials. 4. It is easy to repair. 5. The pressure of bone and mucosal tissue is decreased and bite force is dispersed.

• 대한치과보철학회지
• /
• 제13권1호
• /
• pp.35-37
• /
• 1975

The author conducted an clinical study of closed mouth impression technique with a case of complete denture patient of favorable ridge contour to see the effect on the lingual border molding of lower denture. As a result, the shape of the border was formulated a quite different contour from the open mouth impression technique. The obtained contour had to be reshaped considerably. It was found that functional harmony with the surrounding tissue was difficult to be maintained. However, the contour is surely stable and favorable form for the retention of the lower denture provided patient is possible to adapt.

• 대한치과의사협회지
• /
• 제36권11호통권354호
• /
• pp.794-799
• /
• 1998

Many references report that abnormal diastema except temporary diastema existing in mixed dentition period is caused by maxilary heavy labial frenum, malocclusion, progressive periodontal disease, and loss of posterior teeth. We can diagnose patient as diastema caused by periodontal disease, especially, in case of accompanying progressively destructed anterior maxillary alveolar bone defect, and interseptal bone defect. We report Multiple disciplinary approach for diastema associated with periodontal disease. Periodontal treatment(Guided Tissue -Regeneration, alveoloplasty, bone graft), or thodontic treatment (space closure, redistribution), and the final proshodontic restoration for retention were used.