• Maxillofacial Plastic and Reconstructive Surgery
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• 제16권3호
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• pp.290-302
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• 1994

This study was aimed to clarify the histopathological changes in the experimental animal model subjcted to rigid fixation performed across the frontonasal sutrue in growing rabbits. Sixteen rabbits aged 6 weeks used. In experimental group(n=12), rigid fixation with miniplates and screws was performed across the frontonasal suture. Control group(n=4) was those with periosteal elevation only. Experimental animals were sacrificed on the 2nd, 4th, 8th, and 12th week after operation, and frontonasal suture area was excised for light microscopic and scanning electron microscopic examination. The results obtained were as follows : 1. In control groups, collagen fiber bundles ran in the midportion of bone sutrue and cambial layers were seen at bone surface. Sutural surfaces are beveled and external and internal bony projected portions were observed. 2. In experimental groups, distance of bone suture was decreased by new bone formation on the 2nd week, while increased by bone resorption at the miniplate applied area and bone formation in the adjacent bone on the 4th week. 3. In experimental groups, the original bone surface was almost resorbed and new bone formation was found on the 8th week. Regulary-run collagen fibers, smooth and dense bone surfaces were similar to the bone patterns of control groups on the 12th week. Above results suggest that bone formation is restricted where the miniplate is applied, while compensatory growth is appeared in the adjacent bont. It is considered that rigid fixation with miniplates and acrews results in a little disturbance of sutural growth of the craniofacial bone in infancy and children when applied for short duration.

• Archives of Plastic Surgery
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• 제35권2호
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• pp.181-186
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• 2008

Purpose: Until now, many kinds of treatment modalities for facial bone fractures have been proposed. Among them, the semi-rigid fixation using miniplates has become the most popular procedure due to its simplicity and good clinical results. However, achieving anatomic reduction of bone fragments with miniplates may be difficult because of inadequate instrumentation for fracture fragment stabilization. We examined the use of inter-maxillary fixation screws or titanium screws tied with stainless steel wire to assist in positioning of fractured segment. Methods: We used this method for reduction in 50 cases of facial bone fractures. Inter-maxillary fixation screws or titanium screws tied with stainless steel wire were used to assist in aligning bony segment. Postoperative radiologic and clinical follow-ups were performed.Results: Radiologic follow-up showed correct reduction and fixation in all cases. Nonnunion and malunion were not shown. Clinical follow-up showed an satisfactory results. Conclusion: By using Inter-maxillary fixation screws tied with stainless steel wire, it was shown that reducing the bony segment to their preinjury position is easy to perform and it enables us to make more accurate reduction, ensure wider visual field.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제27권2호
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• pp.164-170
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• 2005

The purpose of this study was to compare a sample of patients who had condylar fractures treated with open reduction using different plating techniques, to evaluate which plating technique is useful for stable fixation for fractures of the mandibular condyle and to evaluate effectiveness of resorbable miniplate. There were 60 patients (41 males, 19 females) whose condylar fractures were treated with open reduction. Rigid fixation was performed with a single miniplate, double miniplate ot one miniplate & one microplate and single resorbable plate. All patients remained intermaxillary fixation for 1 week postoperatively. Active physiotherapy was started after 2 weeks postoperatively. Radiographic evaluation (plate fracture, plate bending, screw loosening, displacement of condyle etc.) was performed at pre-operative, immediate, 2 weeks, 1 month, 3 months, 6 months after surgery. Clinical evaluation included degree of mouth opening, occlusion, mandibular lateral excursion, infection and facial nerve paralysis. In radiographic evaluation, displacement of fractured condylar segment associated with plate bending or screw loosening were showed 6 cases and 3 cases for single miniplate system and resorbable miniplate system. There was no patients who have this problem on double miniplate system. The results revealed that the application of two miniplates were more recommendable than single miniplates. When we select resorbable miniplate system, we should consider the type of fractures, post-operative treatment protocol and surgical technique.

• 한국임상수의학회지
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• 제30권2호
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• pp.127-130
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• 2013

13년령의 4.2 kg 암컷 푸들이 하악의 병적 골절 후 지역병원에서 받은 양측성 하악 수술의 실패로 내원하였다. 수술은 2.0-mm miniplates/screws, 돼지해면질골 및 흡수성 막을 사용해 시행되었다. 수술 후 1일, 1, 4, 8, 12주에 예후를 평가하였다; 치아 부정교합, 골절 불유합, 또는 연부조직 감염의 징후는 보이지 않았다. 그러나 1년 후 장기간 검진에서 콜라겐 막을 사용하지 않았던 왼쪽 하악골절부위에 불유합이 관찰되었다. 따라서 노령견에서 하악골 불유합의 치유에 돼지해면골과 흡수성 막을 함께 사용하는 것은 효과적이라 생각된다.

• Journal of Yeungnam Medical Science
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• 제7권1호
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• pp.203-210
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• 1990

저자들은 영남대학교 영남의료원 치과로 교통 사고후 부정유합으로 인한 부정교합으로 저작 곤란을 호소하며 내원한 환자를 상악골 수평 및 후방 분절 골절단술을 시행해 다음과 같은 결과를 얻었다. 1. 교통 사고후 부정유합된 상악골을 수평 및 후방 분절 골절단술을 이용하여 전방 치열의 반대 교합과 구치부의 개교 및 scissor's bite를 해소했다. 2. 술후 감염등 특기할 만한 합병증은 발생하지 않았으며 술후의 종창은 48시간이 지나면서 서서히 감소했다. 3. 수술후 악간고정은 8주간 시행했으며 악간 고정 제거 1주후 정상적인 개구가 가능했다. 4. 절단된 상악골 고정시 확고한 고정과 회귀성향을 줄이기 위해 miniplates로 고정했다.

• Journal of Korean Neurosurgical Society
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• 제52권2호
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• pp.120-125
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• 2012

Objective : To investigate the feasibility of C1 lateral mass screw and C2 pedicle screw with polyaxial screw and rod system supplemented with miniplate for interlaminar fusion to treat various atlantoaxial instabilities. Methods : After posterior atlantoaxial fixation with lateral mass screw in the atlas and pedicle screw in the axis, we used 2 miniplates to fixate interlaminar iliac bone graft instead of sublaminar wiring. We performed this procedure in thirteen patients who had atlantoaxial instabilities and retrospectively evaluated the bone fusion rate and complications. Results : By using this method, we have achieved excellent bone fusion comparing with the result of other methods without any complications related to this procedure. Conclusion : C1 lateral mass screw and C2 pedicle screw with polyaxial screw and rod system supplemented with miniplate for interlaminar fusion may be an efficient alternative method to treat various atlantoaxial instabilities.

• 대한두개안면성형외과학회지
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• 제18권2호
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• pp.73-75
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• 2017

The management of mandibular angle fractures is often challenging and results in the highest complication rate among fractures of the mandible. In addition, the optimal treatment modality for angle fractures remains controversial. Traditional treatment protocols for angle fractures have involved rigid fixation with intraoperative maxillomandibular fixation (MMF) to ensure absolute stability. However, more recently, non-compression miniplates have gained in popularity and the use of absolute intraoperative MMF as an adjunct to internal fixation has become controversial. In this article, the history of, and current trends in, the treatment of mandibular angle fractures will be briefly reviewed. In addition, issues regarding the management of the third molar tooth will be discussed.

• Nuclear Engineering and Technology
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• 제49권5호
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• pp.1044-1062
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• 2017

The construction project of the Kijang research reactor (KJRR), which is the second research reactor in Korea, has been launched. The KJRR was designed to use, for the first time, U-Mo fuel. Plate-type U-7 wt.% Mo/Al-5 wt.% Si, referred to as U-7Mo/Ale5Si, dispersion fuel with a uranium loading of $8.0gU/cm^3$, was selected to achieve higher fuel efficiency and performance than are possible when using $U_3Si_2/Al$ dispersion fuel. To qualify the U-Mo fuel in terms of plate geometry, the first miniplates [HANARO Miniplate (HAMP-1)], containing U-7Mo/Al-5Si dispersion fuel ($8gU/cm^3$), were fabricated at the Korea Atomic Energy Research Institute and recently irradiated at HANARO. The PIE (Post-irradiation Examination) results of the HAMP-1 irradiation test were analyzed in depth in order to verify the safe in-pile performance of the U-7Mo/Al-5Si dispersion fuel under the KJRR irradiation conditions. Nondestructive analyses included visual inspection, gamma spectrometric mapping, and two-dimensional measurements of the plate thickness and oxide thickness. Destructive PIE work was also carried out, focusing on characterization of the microstructural behavior using optical microscopy and scanning electron microscopy. Electron probe microanalysis was also used to measure the elemental concentrations in the interaction layer formed between the U-Mo kernels and the matrix. A blistering threshold test and a bending test were performed on the irradiated HAMP-1 miniplates that were saved from the destructive tests. Swelling evaluation of the U-Mo fuel was also conducted using two methods: plate thickness measurement and meat thickness measurement.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제38권
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• pp.20.1-20.6
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• 2016

Background: Most of cleft lip and palate patients have the esthetic and functional problems of midfacial deficiencies due to innate developmental tendency and scar tissues from repeated operations. In these cases, maxillary protraction is required for the harmonious facial esthetics and functional occlusion. Case presentation: A 7-year old boy had been diagnosed as severe maxillary constriction due to unilateral complete cleft lip and palate. The author tried to correct the secondary deformity by early distraction osteogenesis with the aim of avoiding marked psychological impact from peers of elementary school. From 1999 to 2006, repeated treatments, which consisted of Le Fort I osteotomy and face mask distraction, and complementary maxillary protraction using miniplates were performed including orthodontics. But, final facial profile was not satisfactory, which needs compromising surgery. Conclusions: The result of this study suggests that if early distraction treatment is performed before facial skeletal growth is completed, an orthognathic surgery or additional distraction may be needed later. Maxillofacial plastic and reconstructive surgeons should notify this point when they plan early distraction treatment for cleft maxillary deformity.

• Archives of Plastic Surgery
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• 제32권6호
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• pp.739-743
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• 2005

Subcondylar fractures have generally been treated by intermaxillary fixation except in cases where there is an absolute indication for open reduction. The reason behind a less aggressive surgical approach lies on the inherent difficulties in manipulating fragments in such a small area at the risk of damaging facial nerves or vessels such as the internal maxillary artery. However, long-term follow-up studies showed that conservative treatment of subcondylar fractures results in disturbances of occlusal function, deviation of the mandible, internal derangement of the temporomandibular joint, and ankylosis of the joint. We carried out open reduction of dislocated subcondylar fractures in 14 patients from 2000 to 2004 by a retromandibular approach. After the reduction of fractured bone, two H-shaped miniplates with 6 holes were fixed with screws at the anterior and posterior surfaces of the subcondyle. The retromandibular approach allowed good access and easy manipulation of the subcondyle. Immediate relief from malocclusion and correction of mandibular midline shifting were observed in all patients. Late temporomandibular dysfunction and ankylosis were not observed. Open reduction with plate osteosynthesis made it possible to avoid IMF in 7 of the 14 patients. The present study shows that open reduction through this retromandibular approach can produce good outcome in adult patients with subcondylar fracture.