• Maxillofacial Plastic and Reconstructive Surgery
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• 제37권
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• pp.27.1-27.7
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• 2015

The aim of this study was to evaluate the clinical relevance of autogenous fresh demineralized tooth (Auto-FDT) prepared at chairside immediately after extraction for socket preservation. Teeth were processed to graft materials in block, chip, or powder types immediately after extraction. Extraction sockets were filled with these materials and dental implants were installed immediately or after a delay. A panoramic radiograph and a conebeam CT were taken. In two cases, tissue samples were taken for histologic examination. Vertical and horizontal maintenance of alveolar sockets showed some variance depending on the Auto-FDT and barrier membrane types used. Radiographs showed good bony healing. Histologic sections showed that it guided good new bone formation and resorption pattern of the Auto-FDT. This case series shows that Auto-FDT prepared at chairside could be a good material for the preservation of extraction sockets. This study will suggest the possibility of recycling autogenous tooth after immediate extraction.

• International Journal of Safety
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• 제10권1호
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• pp.36-40
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• 2011

Personnel maintaining or repairing the railway tracks or signaling facilities around tracks may experience the sensory disorder when doing maintenance works at the trackside of railway for long time. In this case personnel maintaining at the trackside may collide with the train since they cannot recognize the approach of motor-car although it approaches to the vicinity of maintenance workplace because of the sensory block phenomenon occurred due to their long hours of continued monotonous maintenance work. In order to prevent such motor-car accidents that may occur because railway track workers are unable to recognize the approaching train, the safety alarm equipment is developed to make the approaching motor-car send radio signals and bidirectional detection mechanism between approaching train and trackside personnel. It shows the possibility of utilization in various forms of safety equipment for workers only to the safety helmet to be worn by the maintenance workers while using the configuration of transmitting/receiving sides. In the paper it is represented new alarm equipment, which is the bone-anchored speaker-based safety helmet to be worn by the maintenance workers.

• 한국임상수의학회지
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• 제38권2호
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• pp.94-97
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• 2021

An 18-year-old warmblood gelding was presented to Jeju National University Equine Hospital with chronic bilateral forelimb lameness. Navicular syndrome was suspected based on clinical findings, the hoof test, palmar digital nerve block, and radiographic results. Computed tomography (CT) was performed under general anesthesia. Bone cysts, enlarged vascular channels, sclerosis, and enthesophytes were identified in the navicular bone on CT images. Mineralization in the deep digital flexor tendon was also observed. CT can be a useful diagnostic tool for identifying lesions of the navicular bone and adjacent structures in horses. The horse was treated with an intra-bursal injection of triamcinolone and gentamicin. Lameness started to improve two days later and the horse was sound after two months of the injection. CT enabled us not only to diagnosis of navicular syndrome but also to determine the degree and extent of the lesions.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제28권3호
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• pp.242-246
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• 2006

Objective : This is to report the criteria of success of intraoral distraction osteogenesis for alveolar augmentation in the severely atrophied alveolar defects through clinical result of 2 cases. Subjects and Methods : Anterior segmental osteotomy was performed and alveolar distractors (Martin and Leibinger, Germany) were applied each in 2 patients with severely defected anterior maxillary area. The osteomized alveolar segments were distracted by 1mm a day after latency period. After the consolidation period implants were installed with removal of distractor. The implants were evaluated clinically and radiographically. Results : In Case I, the distracted bone was directed to the palatal side, and another augmentation treatment - block bone graft, guided bone regeneration - was needed. In Case II, the successful alveolar bone augmentation was achieved. Dental implant was placed on distracted alveolar bone, and showed good osseointegration and good function without any complication. Conclusion : Distraction osteogenesis can be a good choice for alveolar ridge augmentation of severely atrophied ridges. However, the anterior esthetic prosthetics relies on the control of the vector, the kind of distractor, the healing capacity of patient and the etiology of atrophy. Therefore another study of each category would be needed.

• Journal of Periodontal and Implant Science
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• 제30권4호
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• pp.803-814
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• 2000

Current acceptable methods of promoting periodontal regeneration are basis of removal of diseased soft tissue, root treatment, guided tissue regeneration, graft materials, biological mediators. Platelet Rich Plasma have been reported as a biological mediator which regulate activities of wound healing progress including cell proliferation, migration, and metabolism. The purpose of this study is to evaluate the possibility of using the Platelet Rich Plasma as a regeneration promoting agent for furcation involvement defect. Five adult beagle dogs were used in this experiment. With intrasulcular and crestal incision, mucoperiosteal flap was elevated. Following decortication with 1/2 high speed round bur, degree II furcation defect was made on mandibular third(P3), forth(P4) and fifth(P5) premolar. 2 month later experimental group were PRP plus bovine bone and bovine bone only. After 4, 8 weeks, the animals were sacrificed by perfusion technique. Tissue block was excised including the tooth and prepared for light microscope with Gomori's trichrome staining. At 4 weeks after surgery, there were rapid osteogenesis phenomenon on the defected area of the Platelet Rich Plasma plus bovine bone group and early trabeculation pattern was made with new osteoid tissue produced by activated osteoblast. Bone formation was almost completed to the fornix of furcation by 4 weeks after surgery. In conclusion, Platelet Rich Plasma can promote rapid osteogenesis during early stage of periodontal tissue regeneration.

• Journal of Periodontal and Implant Science
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• 제43권1호
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• pp.30-36
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• 2013

Purpose: Implant stability at the time of surgery is crucial for the long-term success of dental implants. Primary stability is considered of paramount importance to achieve osseointegration. The purpose of the present study was to investigate the correlation between the insertion torque and primary stability of dental implants using artificial bone blocks with different bone densities and compositions to mimic different circumstances that are encountered in routine daily clinical settings. Methods: In order to validate the objectives, various sized holes were made in bone blocks with different bone densities (#10, #20, #30, #40, and #50) using a surgical drill and insertion torque together with implant stability quotient (ISQ) values that were measured using the Osstell Mentor. The experimental groups under evaluation were subdivided into 5 subgroups according to the circumstances. Results: In group 1, the mean insertion torque and ISQ values increased as the density of the bone blocks increased. For group 2, the mean insertion torque values decreased as the final drill size expanded, but this was not the case for the ISQ values. The mean insertion torque values in group 3 increased with the thickness of the cortical bone, and the same was true for the ISQ values. For group 4, the mean insertion torque values increased as the cancellous bone density increased, but the correlation with the ISQ values was weak. Finally, in group 5, the mean insertion torque decreased as the final drill size increased, but the correlation with the ISQ value was weak. Conclusions: Within the limitations of the study, it was concluded that primary stability does not simply depend on the insertion torque, but also on the bone quality.

• 대한관절경학회지
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• 제3권2호
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• pp.97-101
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• 1999

목 적 : 각 환자의 슬개건 길이, 터널간 길이, 경골 터널 길이, 경골 골편의 길이를 측정하여 이식물과 터널 길이의 부조화를 예방하는 수기를 찾고자 하였다. 대상 및 방법 : 1997년 3월부터 1999년 6월까지 골-슬개건-골을 이용하여 전방십자인대 재건술을 시행 받았던 환자 15례를 대상으로 하였다. 수술시 Tibial Tunnel Guide의 각도는 $40^{\circ}$(Acufex, MA, USA)로 고정하였으며, 터널간 길이(X), 경골 터널 길이(T), 슬개건 길이(N), 경골 골편 길이(Y)를 측정하였다. 대퇴골 터널 길이(F)와 슬개골 골편 길이(P)는 공히 25mm로 일치시켰다. 터널 길이 부조화를 예방하기 위해 임의적으로 조절이 용이한 경골 골편의 길이는 경골 터널 길이와 터널간 길이를 합하여 슬개건 길이를 뺀 단순 공식(Y=X+T-N)으로 계산하였다. 결 과 : 대상환자에게 측정한 지표들의 평균값은 터널간 길이(X) $23.4{\pm}1.4mm$, 경골 터널 길이(T) $43.6{\pm}1.7mm$, 슬개건 길이(N) $40{\pm}2.4mm$, 경골 골편 길이(Y) $27{\pm}2.4mm$였다. 결 론 : 저자들의 방법은 터널의 총길이를 측정한 후 이식물의 총길이를 경골 골편 길이로 조정함으로써 경골터널 내에서의 이식물-터널 길이 부조화를 방지할 수 있었다.

• 구강회복응용과학지
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• 제25권3호
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• pp.255-265
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• 2009

즉시 하중에 대한 관심과 시도가 증가되고 있지만, 명확한 술식이 정립되어 있지는 않다. 본 연구에서는 상악 전치부 임플란트에서 즉시 하중시에 골과 임플란트에 나타나는 응력분포 양상을 3차원 유한요소법을 이용하여 알아보고자 하였다. 골질이 D3인 상악 전치부의 골모형을 구성하고, 서로 다른 길이(8.5 mm, 10.0 mm, 11.5 mm, 13.0 mm, 15.0 mm)의 직경 4.0 mm 나사형 임플란트를 식립한 모형을 제작하였다. 해석 절차의 간소화를 위하여 모든 물성은 등방성, 선형탄성, 균질성으로 가정하였다. 골-임플란트 계면은 접촉 요소법으로 처리하여 골유착이 일어나기 전 상태로 구성하였다. 지대주 장축에 120도의 각도로 지대주의 구개 절단각 중앙부에 176 N의 정하중을 가하고 응력분포를 관찰하였다. von Mises stress를 이용하여 응력을 분석한 결과 모든 모형에서 순측 피질골에 응력이 집중되었으며 피질골과 망상골의 경계부에서 최대 응력값을 나타내었다. 길이에 따른 비교시 8.5 mm 모형에서 가장 큰 최대 응력값을 나타냈으며, 임플란트 길이가 증가될수록 좀 더 양호한 응력 분포를 나타내었다. 상악 전치부 즉시 하중시에 피질골의 존재 유무는 매우 중요하며, 길이가 긴 임플란트를 식립하는 것이 유리하며, 가능하면 13.0 mm 이상의 임플란트를 식립하는 것이 즉시하중을 시행할 때 응력 분산에 유리한 것으로 판단된다.

• The Korean Journal of Pain
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• 제1권1호
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• pp.120-124
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• 1988

제1족지단(第一足趾端)에 심한 통증(痛症)과 궤양(潰瘍)으로 입원한 31세(歲)의 Buerger 병(病) 환자(患者)에 X-선조(線造) 영하(影下)에서 7% phenol을 사용한 제(第)1, 2 및 3 요부교감신경절차단(腰部交感神經節遮斷)을 시행하였다. 교감신경절차단후(交感神經節遮斷後) 족지(足趾)의 통증완화(痛症緩和)와 온감(溫感)을 느낄 수 있었으며 이후 2회(回)의 2.5% bupivacaine을 이용한 경막외강차단(硬膜外腔遮斷) 후 통증(痛症)소실과 함께 순환혈류(循環血流) 개선(改善)을 plethysmogram으로 확인할 수 있어서 성공적인 교감신경절차단술(交感神經節遮術)이 시행됐다고 볼 수 있어 문헌적(文獻的) 고찰(考察)과 함께 보고(報告)하는 바이다.

• 동굴
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• 제7호
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• pp.11-14
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• 1998

1. Stafford's Cave, named by the miners because a former visitor, Mr. Stafford, broke his leg in it, is the most northern of the three caves. The entrance lies concealed in the undergrowth, but is otherwise wide and open. A steep conical shaft leads down for a depth of about 80 ft from the floor of the cave; at the bottom, rammed in between the two walls, lies a great block of limestone below which a rivulet streams forth, flowing through the cave, which runs from east; in the cave it is joined by a little tributary.(omitted)