• Journal of Periodontal and Implant Science
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• 제37권2호
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• pp.151-164
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• 2007

Objective: The sinus floor elevation procedures have been used to facilitate implant placement in the severely atrophic posterior maxilla. Many variables may have an influence on the outcomes of the sinus floor elevation in combination with implant treatment. The aim of this study was to analyze survival rate of implants placed in the edentulous maxillae of patients in whom sinus floor elevation was undertaken according to variables. Materials and Methods: It consisted of 96 patients(50 male and 46 female), ranging in age from 31 to 70 years(mean 49 years), who underwent sinus floor elevation procedure(94 implants in left side and 106 implants in right side) from 2001 to 2002. A total of 200 implants were placed in the grafted sinus(73 implants in lateral approach and 127 implants in crestal approach). All implants were restored by fixed prosthesis. All patients were healthy. Follow-up periods for implants were between 48 to 60 months. Results: The cumulative survival rate of implants was 91.5%. Gender, age and operation site did not have an influence on the survival rate. There was statistically significant differences for the implants which placed in less than 4 or 5 rom residual bone height, the survival rate was 60%, 81.4% respectively (p<0.05). There was no statistically significant difference of implants survival rate ac- cording to approach technique. The survival rate for 100% autogenous bone grafts was lower with respect to composite grafts containing autogenous bone and 100% substitutes. The survival rate for hydroxyapatite-coated implants was statistically significant lower than other textured group (p<0.05). Conclusion: Residual bone height, surface texture and graft materials have an influence on the survival rate. To use autogenous bone as a part of a composite bone replacement, implant texture which leads to more favorable implant-bone interface were necessary. To determine residual bone height for initial implant stability was important.

• Journal of Korean Dental Science
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• 제8권1호
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• pp.36-40
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• 2015

Fibrous dysplasia is a bone disorder characterized by progressive replacement of normal bone by fibrous bone tissue. Common involving sites of fibrous dysplasia are the skeletal system including long bones, ribs, craniofacial bones and the pelvis. If maxilla were affected by fibrous dysplasia, antrum is almost always involved. And fibrous dyplasia in maxillary sinus were followed the shape of bone. In our case, the lesion involves antrum but, its shape was different from typical fibrous dysplasia pattern of maxillary sinus. Therefore we report a case of monostotic pediculated fibrous dysplasia in the maxillary sinus with a review of literature.

• Biomaterials and Biomechanics in Bioengineering
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• 제3권2호
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• pp.85-104
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• 2016

Stability and loosening of implanted femoral stems in Total Hip Replacement have been well established as barriers to the primary concerns of osseointegration and long term implant survival. In-vitro experiments and finite element modeling have for years been used as a primary tool to assess the bone stem interface with variable methodologies leading to a wide range of micromotion, interference fit and stress shielding values in the literature. The current study aims to provide a comprehensive review of currently utilized methodologies for in-vitro mechanical testing as well as finite element modeling of both micromotion and interference of implanted femoral stems. A total of 12 studies detailed in 33 articles were selected for inclusion. Experimental values of micromotion ranged from 12 to $182{\mu}m$ while finite element analysis reported a wider range from 2.74 to $1,277{\mu}m$. Only two studies were found that modeled bone/implant contact with consideration for interference fit. In studies evaluating stem micromotion in THA, the reference surface at the bone/stem interface should be well defined. Additionally, the amount of penetration considered should be disclosed and associated with bone density and roughness.

• Journal of Audiology & Otology
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• 제25권3호
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• pp.159-162
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• 2021

Temporal bone trauma can cause hearing loss and in case of prolonged conductive hearing loss, traumatic ossicular injury should be considered. Separation of the incudostapedial joint is the most common lesion, and stapediovestibular dislocation is relatively rare but can easily cause perilymphatic fistula. Here, we report a very rare case of external stapediovestibular dislocation after trauma, ending up with successful surgical outcome. A 27-year-old man with non-progressive hearing loss on the right side since childhood visited the clinic. Audiogram showed a conductive hearing loss with air-bone gap of 55 dB on the right side. Temporal bone CT revealed the disruption of ossicular chain. An exploratory tympanotomy identified multiple ossicular disruptions including external stapediovestibular dislocation with shiny fibrous membrane sealing the oval window. Ossicular chain reconstruction was performed using the total ossicular replacement prosthesis of titanium. A postoperative audiogram showed a recovery of air-bone gap less than 10 dB. To the best of our knowledge, this is the first case of external long-standing stapediovestibular dislocation, with oval window completely sealed with fibrous membrane, ending up with successful hearing recovery by surgery. This case would help dealing with such condition which can be encountered in the clinic.

• 대한청각학회지
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• 제25권3호
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• pp.159-162
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• 2021

Temporal bone trauma can cause hearing loss and in case of prolonged conductive hearing loss, traumatic ossicular injury should be considered. Separation of the incudostapedial joint is the most common lesion, and stapediovestibular dislocation is relatively rare but can easily cause perilymphatic fistula. Here, we report a very rare case of external stapediovestibular dislocation after trauma, ending up with successful surgical outcome. A 27-year-old man with non-progressive hearing loss on the right side since childhood visited the clinic. Audiogram showed a conductive hearing loss with air-bone gap of 55 dB on the right side. Temporal bone CT revealed the disruption of ossicular chain. An exploratory tympanotomy identified multiple ossicular disruptions including external stapediovestibular dislocation with shiny fibrous membrane sealing the oval window. Ossicular chain reconstruction was performed using the total ossicular replacement prosthesis of titanium. A postoperative audiogram showed a recovery of air-bone gap less than 10 dB. To the best of our knowledge, this is the first case of external long-standing stapediovestibular dislocation, with oval window completely sealed with fibrous membrane, ending up with successful hearing recovery by surgery. This case would help dealing with such condition which can be encountered in the clinic.

• 대한치과교정학회지
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• 제54권1호
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• pp.3-15
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• 2024

The prevalence of intrabony defects in patients with advanced periodontitis stages III and IV is high. These patients usually need both periodontal treatment and orthodontic therapy, including tooth movement through bone defects, to improve masticatory function, aesthetics, and overall quality of life. Clinical practice guidelines recommend periodontal regenerative surgical interventions to resolve these defects and propose initiating orthodontic tooth movement (OTM) once periodontal therapy goals have been met. Surgical interventions using various regenerative technologies like barrier membranes and enamel matrix proteins, combined or not with bone replacement grafts, have proven effective in regenerating lost periodontal tissues. However, the combination of periodontal and orthodontic treatments requires consideration of how periodontal regenerative therapies influence OTM. Studies suggest that regenerated bone may differ in density, composition, vascularity, and cellular activity, potentially affecting the speed and efficiency of OTM, and potential root resorption of moved teeth. Understanding the sequence and timing of implementing OTM after regenerative periodontal interventions is crucial due to their interlinked processes of bone resorption and formation. This narrative review aims to uncover scientific evidence regarding these combined treatments, examining the impacts of different regenerative technologies on OTM and delineating their advantages, limitations, and best practices.

• Clinics in Shoulder and Elbow
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• 제27권1호
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• pp.108-116
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• 2024

Reverse total shoulder arthroplasty (RTSA) is widely popular among shoulder surgeons and patients, and its prevalence has increased dramatically in recent years. With this increased use, the indicated pathologies associated with RTSA are more likely to be encountered, and challenging patient presentations are more likely to be seen. One prominent challenging presentation is RTSA patients with severe glenoid bone loss. Several techniques with varying degrees of invasiveness, including excessive reaming, alternate centerline, bone grafting, and patient-specific implants (PSIs), have been developed to treat patients with this presentation. PSI treatment uses a three-dimensional reconstruction of a computed tomography scan to design a prosthetic implant or component customized to the patient's glenoid morphology, allowing compensation for any significant bone loss. The novelty of this technology implies a paucity of available literature, and although many studies show that PSIs have good potential for solving challenging shoulder problems, some studies have reported questionable and equivocal outcomes. Additional research is needed to explore the indications, outcomes, techniques, and cost-efficiency of this technology to help establish its role in current treatment guidelines and strategies.

• 대한골관절종양학회지
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• 제1권2호
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• pp.154-163
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• 1995

1986년 3월부터 1993년 12월까지 연세대학교 의과대학 정형외과학 교실에서 상지에 발생한 악성 및 침윤성 양성 골종양에 대하여 사지구제술을 시행하여 다음과 같은 결과를 얻었다. 1. 총 13명의 상지에 발생한 악성 및 침윤성 양성골종양 환자에 대해 사지 구제술을 시술 하였다. 2. 사지 구제 술의 내용은 8 례가 Tikhoff -Linberg 수술, 2 례가 분절절제 및 재접합술, 2 례가 종양삽입물 치환술 그리고 1 례가 분절절제술 및 유리혈관부착 생비골이식술이었다. 3. 13 례중 3 례가 골육종, 4 례가 연골육종, 3 례가 거대세포종, 1 례가 병적 골절을 동반한 유잉육종, 1 례가 연골아세포종, 1 례가 전완부 건 및 근육과 원위요골 및 척골을 동시에 침범한 평활근 육종이었다. 4. 추시기간은 술수 1년에서부터 7년 5개월로 평균 4년 5개월이었다. 5. 총 13명의 환자 중 1 례의 상완골에 발생한 병적 골절을 동반한 유잉 육종의 환자에서 국소재발 및 다발성 골전이가 나타나 수술 후 4년 4개월만에 사망하였고 나머지 12 례의 환자는 국소재발이나 원격전이의 소견은 없었다. 6. 상지에 발생한 악성 및 침윤성 양성 골종양의 치료로 여러방법의 사지구제술은 병의 치료 면이나 기능적인 면에서 만족스런 결과를 가져왔다.

• 대한유전성대사질환학회지
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• 제6권1호
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• pp.58-62
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• 2006

Gaucher disease is an inherited disorder due to a deficiency in the activity of glucocerebrosidase (EC. 3.2.1.45) by genetic mutation which resulted from missense, nonsense, frameshift, deletion in long arm 21 of chromosome 1 (1q21). Gaucher disease is classified into the main three types as type 1 (nonneuronopathic), type 2 (acute neuronopathic) and type 3 (subacute neuronopathic) according to the progressive phase of manifestations and nervous system involvement. Gaucher disease patients had been treated by using the method as splenectomy and bone marrow transplantation. But enzyme replacement therapy as a more effective treatment has been available since the early 1990's. In order to treat Gaucher disease efficiently by using ERT, it is necessary to chase the progress of the therapy. In this study, therefore, we tried to chase the progress of the ERT by using the measurement of chitotriosidase activity in Gaucher disease patients.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.540-540
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• 2000

This paper explores design and control methods of a surgical robot for total hip replacement surgery which can be easily maneuvered by a surgeon Like an advanced surgical tool. The 3-DOF in-parallel surgical robot is fixed directly onto patient's femur by the bone clamp during surgery. With the master/slave combined surgical robot, the surgeon can directly control the motion of the surgical robot with surgeon's experience and judgment during operation. For the easiness of operation, the master/slave combined robot is controlled using admittance control paradigm. And for the precise operation, the robot motion is restricted at the surgical boundary using virtual hard wall display.