• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제26권6호
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• pp.672-676
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• 2000

One of the current treatment methods for chronic osteomyelitis is removal of the infected and necrotic tissue to reduce the bacterial concentration as much as possible. This is performed concomitantly with antibiotic therapy. Chronic osteomyelitis(C.O.) implies chronic ischemia of the diseased bone. Thus, the treatment for C.O. requires high systemic level of antibiotics. In some cases, however, inherent undesirable adverse effects(for example, nephrotoxicity, ototoxicity, and others) may render this course of treatment difficult. Knowing that residual monomers are released from hardened bone cement, installation of antibiotic-impregnated PMMA(polymethyl-methacrylate) beads in situ have been one of treatment methods of C.O. When introduced into the wound, they established an exceedingly high level of local antibiotics for prolonged period without high systemic level of antibiotics. We experienced favorable results with vancomycin-impregnated PMMA beads for the treatment of C.O. of the mandible. So, we report it with literature reviews.

• 대한치과보철학회지
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• 제45권1호
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• pp.60-70
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• 2007

Statement of problem: The cement-type abutment would be needed for the reduction of its body in order to correct the axis and to assure occlusal clearance. In the case of intraoral preparation, there is a potential risk that generated heat could be transmitted into the bone-implant interface, where it can cause deterioration of tissues around the implant and failed osseointegration. Purpose: The purpose of this study was to assess the difference of the heat transmitting effect on external and internal connection implant types under various conditions. Material and method: For evaluating the effects of alternating temperature, the thermocoupling wires were attached on 3 areas of the implant fixture surface corresponding to the cervical, middle, and apex. The abutments were removed 1mm in depth horizontally with diamond burs and were polished for 30 seconds at low speed with silicone points using pressure as applied in routine clinical practice. Obtained data were analyzed using Mann-Whitney rank-sum test and Wilcoxon / Kruskal-Wallis Tests. Result: Increased temperature on bone-implant interface was evident without air-water spray coolant both at high speed reduction and low speed polishing (p<.05). But, the difference between connection types was not shown. Conclusion: The reduction procedure of abutment without using proper coolant leads to serious damage of oral tissues around the implant irrespective of external and internal connection type.

• 대한골관절종양학회지
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• 제8권2호
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• pp.58-62
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• 2002

골의 거대세포종은 원발성 골 종양의 5-10%를 차지한다. 주로 20-40세 사이의 연령에서 많으며 90% 이상이 장골에 발생하지만 아주 드물게 수부나 족부 같은 편평골이나 단골에도 발생한다. 주요 증상은 동통이며 종종 병적 골절이나 심지어 연부 조직의 침범이 동반될 수있다. 방사선학적으로 골간단에 음영이 감소된 균질의 골 용해 소견이 보이며 주위에 반응성골 형성은 없다. 치료는 골 종양의 병기에 따라 차이가 있으며 재발율을 줄이고 침범 부위의 기능을 보존할 수 있는 수술적 치료가 필요하다. 비진행성 병기는 소파술후 골이식이나 골시멘트 충전을 할 수 있고 진행성 병기는 광범위 절제술후 관절 고정술이나 종양 대치물로 사지 구제술을 시행한다. 전이, 국소재발을 주기적으로 관찰해야 한다. 저자들은 족부의 외측 설상골에 발생한 거대 세포종을 경험하였기에 보고하고자 한다.

• The Korean Journal of Pain
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• 제20권2호
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• pp.213-218
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• 2007

Percutaneous vertebroplasty and balloon kyphoplasty have been accepted as effective treatment modalities for vertebral compression fractures in patients with vertebral metastasis. However, when these procedures are conducted in patients with lytic lesions of the vertebral pedicle, polymethylmethacrylate leakage through the lytic lesions that occurs during percutaneous pediculoplasty can increase the procedural risks due to the immediate vicinity of neural structures. In spite of this risk, there are not many available reports on safer methods of pediculoplasty. Here we report a case of vertebral metastasis in which the pedicle infiltration of cancer was successfully treated by pediculoplasty using a bone filler device that contained thick bone cement during a balloon kyphoplasty procedure.

• 대한골관절종양학회지
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• 제6권2호
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• pp.53-60
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• 2000

목적 : 상완골 근위부의 악성 골종양에 대한 골수강내 금속정과 골시멘트를 이용한 사지 구제술을 시행한 환자에서 수술 후 기능적 결과 및 종양학적 추시 결과를 분석하고자 하였다. 대상 및 방법 : 본 연구는 1992년 8월부터 1998년 4월까지 상완골 근위부의 악성 골종양으로 수술을 받은 18례를 대상으로 하였다. 골육종이 7례, 연골육종이 3례, 재발성 거대세포종이 3례, 전이성 악성 골종양이 3례, 다발성 골수종이 1례, 악성 섬유성 조직구증이 1례였다. 평균 연령은 38세이며, 추시 기간은 평균 26개월이었고, 수술은 병소 절제후 상완골두 모양으로 성형한 골시멘트와 골수강내 정을 이용하여 관절 성형술을 시행하였다. 술후 환자의 기능 평가는 국제 사지 보존 회의(ISOLS)의 기능 평가 방법을 이용하였으며, 또한 국소 재발, 원격 전이, 합병증 및 생존 기간 등을 분석하였다. 결과 : 기능 평가 점수는 평균 21.1(70.3%)이었다. 3례에서 국소 재발이 있었고, 5례에서 원격 전이가 발생하였다. 합병증으로 1례에서는 견관절 불안정성, 1례에서는 심부 조직의 감염이 발생하였다. 현재 지속적 무병 상태 7례, 유병 생존 상태 7례이며, 4례는 원격 전이 등으로 사망하였다. 결론 : 상완골 근위부 악성 골종양에 대하여 골수강내 정과 골시멘트를 이용한 사지 구제술을 시행하여 비교적 만족할 만한 기능적 결과를 얻었다. 이 술식은 선택된 경우에 있어서 상완골 근위부 종양 치료에서 재건 방법의 하나로 고려될 수 있을 것으로 보인다.

• 대한치과보철학회지
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• 제32권1호
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• pp.148-169
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• 1994

The concept of biologic attachment of load-bearing implants has developed over the past decades as an alternative to the difficulties associated with long term implantation using mechanical fixation and bone cement. The choice of implant material is also as critical an element as site preparation or insertion procedure. The properties of implants that affect host tissue responses are not limited to chemical composition alone, but also include shape, surface characteristics, site of implantation, and mechanical interaction with host tissues. Initial mechanical interlocking prevents micromotion and may be a prerequisite for direct bone apposition. A hard tightening of screws does not necessarily mean a stronger fixation and final tightening of the fixtures is dependent on the experience of the operator. Removal torque is lower than insertion torque. The purpose of this study was to investigate differences in the removal torques at the bone-implant interface of polished and sandblasted Titanium. This experiment will give insight into important factors that must be considered when interpreting in vivo screwing forces on implants during the connection of the transmucosal abutments. We evaluated the significance of different surface textures by comparison of the withdrawal forces necessary for removal of otherwise identical rough and polished implants of Titanium and also evaluated interfacial response on the light microscopic level to implant surface. And the priority of the area of insertion on osseointegration were evaluated. 9 Titanium implants - among them, 3 were for the developmental - of either a smooth or rough surface finish were inserted in the dog mandible in the right side. 3 months later Kanon Torque Gauge was used to unscrew the implants. The results were as follows : 1. No significant difference was seen in the removal torque due to variation in surface treatment, 23 Ncm for the sandblasted and 23.33 Ncm for the polished surface (p>0.05). 2. Implants in the anterior (25 Ncm) mandible showed better resistance to unscrewing in comparison to ones in the posterior (18 Ncm) region (p<0.05). 3. Developmental fixtures (22 Ncm) had similar pullout strength to the control group (p>0.05).

• Clinics in Shoulder and Elbow
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• 제21권2호
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• pp.105-110
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• 2018

Since the introduction of shoulder arthroplasty by Neer in 1974, the design of not only the glenoid component but also the humeral component used in shoulder arthroplasty has continually evolved. Changes to the design of the humeral component include a gradually disappearing proximal fin; diversified surface finishes (such as smooth, grit-blasted, and porous coating); a more contoured stem from the originally straight and cylindrical shape; and the use of press-fit uncemented fixation as opposed to cemented fixation. Despite the evolution of the humeral component for shoulder arthroplasty, however, stem-related complications are not uncommon. Examples of stem-related complications include intraoperative humeral fractures, stem loosening, periprosthetic fractures, and stress shielding. These become much more common in revision arthroplasty, where patients are associated with further complications such as surgical difficulty in extracting the humeral component, proximal metaphyseal bone loss due to stress shielding, intraoperative humeral shaft fractures, and incomplete cement removal. Physicians have made many attempts to reduce these complications by shortening the stem of the humeral component. In this review, we will discuss some of the limitations of long-stem humeral components, the feasibility of replacing them with short-stem humeral components, and the clinical outcomes associated with short-stemmed humeral components in shoulder arthroplasty.

• 한국임상수의학회지
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• 제26권4호
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• pp.359-361
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• 2009

체중 25.2 kg 2년령 암컷 알라스카 말라뮤트 개가 교통사고 후 한강 동물병원에 내원하였다. 신체 검사에서 심한 유연과 견치 탈구를 보였으며 방사선 사진에서 앞쪽 하악골 골절이 관찰 되었다. 와이어링과 polymethyl methacrylate을 이용한 외고정을 실시하였다. 수술 7주 후 방사선 사진 검사에서 잘 발달 된 가골 형성이 골절 부위 피질에서 관찰 되었다. 수술 7주 후 핀이 제거 되었으며 정상적인 저작 운동을 관찰 할 수 있었다.

• The Korean Journal of Pain
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• 제21권3호
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• pp.229-232
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• 2008

Insufficiency fractures of the sacrum are relatively common and cause severe low back and buttock pain. Percutaneous vertebroplasty is effective for treating vertebral compression fractures. We present a case of percutaneous sacroplasty for the treatment of low back and buttock pain in a sacral insufficiency fracture. A 79-year-old male with non-small lung cancer presented with severe low back and buttock pain after series of radiation treatments. Preoperative MRI showed both a sacral ala and S2 metastatic insufficiency fracture. An epidural port was inserted for continuous morphine infusion and sacral nerve root blocks were performed. However, his pain did not diminish and we attempted percutaneous sacroplasty. Both sides of the sacroplasty were done with a fluoroscopy-guided technique with 1.7 ml and 2.3 ml of bone cement injected into the right and left sacral ala. Pain relief was significant and the patient was able to sit down 1 day after the procedure.

• 한국세라믹학회지
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• 제40권8호
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• pp.730-734
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• 2003

This research examined the effect, which it follows in particle size distribution change of CaHPO$_4$ㆍ2$H_{2}O$ (DCPD). We used two kinds of compositions; tetracalcium phosphate (TTCP)/dicalcium phosphate dihydrate (DCPD) composition and $\alpha$-tricalcium phosphate ($\alpha$-TCP)TTCP/DCPD composition. As the result, the mean particle size of the DCPD decreased, the setting tine shortened at all compositions. The reference powder (DR), which did not milling, showed about 2 times strength value compared with other milling sample. Especially, the compressive strength of 60 : 20 : 20 sample (DR(do$_{0.5}$)=12.08 $\mu\textrm{m}$) after curing 7 days in simulated body fluid solution was 40$\pm$0.5 MPa, which was the highest. This resulted from the packing density at $\alpha$-TCP/TTCP/DCPD combination.