• Clinics in Shoulder and Elbow
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• 제12권2호
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• pp.150-158
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• 2009

목적: 거대 및 광범위 회전근 개 파열은 치료하기 어려운 질환이나 회전근개에 대한 이해가 높아짐에 따라 완전봉합은 불가능하여도 부분 봉합 또는 “force couple repair”를 통해서도 통증 및 기능호전을 가져올 수 있다고 여겨진다. 그러나 이를 뒷받침하는 연구는 부족한 실정이다. 본 연구의 목적은 회전근개의 부분봉합술만을 시행한 환자들에서의 임상결과와 방사선학적 변화를 평가하는 것이다. 대상 및 방법: 2005년 6월에서 2008년 2월까지 거대 범위에서 광범위 회전근 개 파열에 대해 부분 봉합을 시행 받고 1년 이상 추시가 가능하였던 16예를 대상으로 하였다. 평균 추시 기간은 27.3개월 (15~46)이었고 수술 시 평균 연령은 66.6세 (57~76)였으며 성별은 남자가 7명, 여자가 9명 이었다.동통과 기능에 대한 Visual Analogue Scale (VAS)을 수술 전 후에 비교하였으며 견관절 기능 평가는 American Shoulder and Elbow Surgeons (ASES) score와 Korean Shoulder Scoring system (KSS)을 통해 시행하였다. 술 전 및 술 후에 견관절의 방사선검사를 통해 견봉-상완골 간격 및 퇴행성 변화의 진행 여부를 평가하였다. 결과: 동통에 대한 VAS 점수는 술 전 평균 4.4 ($\pm2.50$)에서 2.1 ($\pm2.26$)로 감소하였고 (p=0.0029) 기능에 대한 VAS 점수는 술 전 46.9 ($\pm16.64$)에서 70.0 ($\pm22.80$)로 호전된 양상 관찰되었다 (p=0.0023). 견관절 기능 평가인 ASES 점수는 술 전 평균 39.0 ($\pm10.80$)에서 80.3 ($\pm16.78$)로 증가하였고 (p<0.0001), KSS 점수는 술 후 평균 81.9 ($\pm16.74$)로 관찰되었다. 술 전 6.6 cm ($\pm1.74$)의 견봉-상완골 간격은 술 후 6.2 cm ($\pm1.69$)로 의미 있는 변화가 없었다 (p=0.3874). Hamada classification을 이용한 견관절의 퇴행성 변화 역시 술 전에 비해 술 후에 통계학적으로 진행하지 않았다 (p=0.2663). 만족도에 있어 3명의 환자에서 매우 좋음, 9명의 환자에서 좋음, 3명의 환자가 보통, 그리고 1명의 환자에서 불량을 표시하였다. 또한 추시 기간 동안 추가적인 수술을 시행한 환자는 없었다. 결론: 완전 봉합이 불가능한 광범위 회전근개 파열 환자에 대해서 부분 봉합술 (force couple repair)를 통해서 술 후 평균 2.3년 (15~46개월)에 좋은 임상결과를 가져올 수 있었으며, 견봉-상완골 간격도 의미 있는 변화가 없었으며 관절와 상완관절의 퇴행성 변화 역시 통계학적으로 진행하지 않았다.

• KIEE International Transactions on Electrophysics and Applications
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• 제4C권4호
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• pp.176-180
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• 2004

This paper presents the fabrication and test of a micro cell exciter actuated by an electromagnetic force for the study on the chondrogenic differentiation of rabbit mesenchymal stem cells (MSCs). The micro cell exciter is designed to apply compressive loading to the alginate gel mixed with the MSCs. The magnetic cell exciter consists of an actuator component and a cartridge-type chamber component. An actuator is composed of a permanent magnet, a core and a coil. The chamber has seven PMMA wells and a cell culture Petri dish. Two types of alginate gels were stimulated by the cell exciters for 10 minutes every 12 hours for 7 days. In order to determine the expression of these matrix components during differentiation, RT-PCR analysis was performed. Collagen type II was expressed in the MSCs subjected to the compressive stimulation.

• 대한치과교정학회지
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• 제15권1호
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• pp.7-22
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• 1985

The purpose of this study was to analyze the stress distribution and the displacement in the maxillary complex after the application of the reverse headgear. The direction of force was parallel to the occlusal plane. Orthopedic force,300gm, was applied to the maxilla of the dry human skull in a forward direction. The stress distribution and the displacement within the maxillary Complex was analyzed by a 3-dimensional finite element method. The results were as follows: 1. The stress distribution at the molar region was greater than that at the anterior. 2. The stress distribution at the lateral side of the premaxilla was greater than that at the middle aide, especially high stress was noted at the canine eminence. 9. Compressive stress was noted only at the frontozygomatic suture of the zygomatic arch. 4. A forward, upward, and sideward displacement was noted at the entire nodal points of the zygomaticomaxillary suture portion. A displacement with a slight rotation was observed on the transverse palatine suture. 5. The maximum stress was observed at the lateral side of the maxillary tuberosity area, and generally the forward and downward displacement was noted at all this area.

• 대한치과교정학회지
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• 제14권1호
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• pp.39-45
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• 1984

10years and 8 months old patient, who had been wearing Milwaukee brace for 5 months, was treated by multibanded system without extract on. She complianed severe protrusion and interdental spacing of upper anterior teeth. Cephalometric analysis revealed short anterior facial height, infraclusion of the lower first molars and severe profrusion of upper and lower anterior teeth. During orthodontic treatment Milwaukee brace was replaced by TLSO, so the orthopedic force on the dentofacial region was eliminated. After 2 years and 3 months, she gained raised bite, increased interincisal angle, salient reduction in the protrusion of upper central incisals with agreeable overjet, complete obliteration of interdental spacing and reduction of protrusion of upper and lower lips.

• 대한치과교정학회지
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• 제19권3호
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• pp.147-160
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• 1989

Long face patients are characterized by excessive anterior facial height, lip incompetence at rest, anterior open bite, and gummy smile. A major problem is an inferior rotation of the posterior maxilla and upper molars. Long face patients have been the most difficult for orthodontist to treat successfully. In growing patients, the methods for impeding excessive vertical growth have been used high pull head gear, functional appliance, and combined type of two. One significant improvement comes from using a full arch splint to deliver force to the maxilla more vertically. In adult patients, orthodontic camouflage treatment is biomechanically difficult and doesn't work when the problem is primarilly vertical. Surgical maxillary impaction provides a means for successfully treating most of problems. Also, superior reposition of the chin via a mandibular inferior border osteotomy is effective in decrease of lower anterior facial height and correction of the poor chin-lip balance. Post-surgical stability and the physiologic response are good. The coordinated orthodontic and surgical treatment is necessary for solution the difficult skeletal deformity.

• 대한소아치과학회지
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• 제23권3호
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• pp.667-673
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• 1996

The prevalence of class III malocclusion is approximately 5$\sim$9%, and about one fourth of this malocclusion is due to underdeveloped maxilla. Maxillary protraction appliance is an orthopedic device which promote the growth of a deficient maxilla by applying extraoral force to actively growing patients. The object of using maxillary protraction appliance is to guide a normal growth of maxilla and mandible and improve the occlusal relationship and also improve the facial profile. The author treated three patients whom were diagnosed as a class III malocclusion due to deficient maxilla using maxillary protraction appliance and the followings are the conclusions : 1. In these cases, anterior crossbite was corrected by anterior movement of maxilla and downward backward rotation of mandible and simultaneously, anterior facial height was increased. 2. The amount of dental change compare to skeletal change was greater as the patients got older. 3. When 500gm of force to each side was applied, the treatment period has been decreased. 4. As a result of applying the force between maxillary first primary molar and canine, there was a small degree of changes in palatal plane. So, it can be concluded that the maxillary protraction appliance is effective in treating growing patients with a deficient maxilla.

• 한국정밀공학회지
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• 제22권6호
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• pp.213-221
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• 2005

An insole type local shear force measurement system was developed and local shear stresses in the foot were measured during level walking. The shear force transducer based on the magneto-resistive principle, was a rigid 3-layer circular disc. Sensor calibrations with a specially designed calibration device showed that it provided relatively linear sensor outputs. Shear transducers were mounted on the locations of four metatarsal heads and heel in the insole. Sensor outputs were amplified, decorded in the bluetooth transmission part and then transferred to PC. In order to evaluate the developed system, both shear and plantar pressure measurements, synchronized with the three-dimensional motion analysis system, were performed on twelve young healthy male subjects, walking at their comfortable speeds. The maximum peak pressure during gait was 5.00kPa/B.W at the heel. The time when large local shear stresses were acted correlated well with the time of fast COP movements. The anteroposterior shear was dominant near the COP trajectory, but the mediolateral shear was noted away from the COP trajectory. The vector sum of shear stresses revealed a strong correlation with COP movement velocity. The present study will be helpful to select the material and to design of foot orthoses and orthopedic shoes for diabetic neuropathy or Hansen disease.

• 대한치과교정학회지
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• 제42권3호
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• pp.100-109
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• 2012

Objective: A national survey was conducted to assess orthodontic residents' current concepts and knowledge of cleft lip and palate (CLP) management in Korea. Methods: A questionnaire consisting of 7 categories and 36 question items was distributed to 16 senior chief residents of orthodontic department at 11 dental university hospitals and 5 medical university hospitals in Korea. All respondents completed the questionnaires and returned them. Results: All of the respondents reported that they belonged to an interdisciplinary team. Nineteen percent indicated that they use presurgical infant orthopedic (PSIO) appliances. The percentage of respondents who reported they were 'unsure' about the methods about for cleft repair operation method was relatively high. Eighty-six percent reported that the orthodontic treatment was started at the deciduous or mixed dentition. Various answers were given regarding the amount of maxillary expansion for alveolar bone graft and the estimates of spontaneous or forced eruption of the upper canine. Sixty-seven percent reported use of a rapid maxillary expansion appliance as an anchorage device for maxillary protraction with a facemask. There was consensus among respondents regarding daily wearing time, duration of treatment, and amount of orthopedic force. Various estimates were given for the relapse percentage after maxillary advancement distraction osteogenesis (MADO). Most respondents did not have sufficient experience with MADO. Conclusions: These findings suggest that education about the concepts and methods of PSIO and surgical repair, consensus regarding orthodontic management protocols, and additional MADO experience are needed in order to improve the quality of CLP management in Korean orthodontic residents.

• 대한치과교정학회지
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• 제50권5호
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• pp.346-355
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• 2020

The treatment of skeletal Class III malocclusion in adolescents is challenging. Maxillary protraction, particularly that using bone anchorage, has been proven to be an effective method for the stimulation of maxillary growth. However, the conventional procedure, which involves the surgical implantation of mini-plates, is traumatic and associated with a high risk. Three-dimensional (3D) digital technology offers the possibility of individualized treatment. Customized mini-plates can be designed according to the shape of the maxillary surface and the positions of the roots on cone-beam computed tomography scans; this reduces both the surgical risk and patient trauma. Here we report a case involving a 12-year-old adolescent girl with skeletal Class III malocclusion and midface deficiency that was treated in two phases. In phase 1, rapid maxillary expansion and protraction were performed using 3D-printed mini-plates for anchorage. The mini-plates exhibited better adaptation to the bone contour, and titanium screw implantation was safer because of the customized design. The orthopedic force applied to each mini-plate was approximately 400-500 g, and the plates remained stable during the maxillary protraction process, which exhibited efficacious orthopedic effects and significantly improved the facial profile and esthetics. In phase 2, fixed appliances were used for alignment and leveling of the maxillary and mandibular dentitions. The complete two-phase treatment lasted for 24 months. After 48 months of retention, the treatment outcomes remained stable.

• 대한치과교정학회지
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• 제41권5호
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• pp.361-370
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• 2011

Objective: Speedy surgical orthodontics (SSO), an innovative orthodontic treatment, involves the application of orthopedic forces against temporary skeletal anchorage devices following perisegmental corticotomy to induce movement of specific dental segments. Herein, we report the biological effects of SSO on the teeth and periodontal structures. Methods: Five beagle dogs were divided into 2 groups and their 6 maxillary incisors were retracted $en$ $masse$ by applying 500 g orthopedic force against a single palatal mini-plate. Retraction was performed without and with perisegmental corticotomy in groups I and II, respectively. All animals were killed on the 70th day, and their periodontal structures were processed for histologic analyses and scanning electronic microscopy (SEM). The linear distance between the third maxillary incisor and canine was used as a benchmark to quantify the retraction amount. Results: Retraction was markedly faster and retraction amount greater in group II than in Group I. Surprisingly, Group II did not show any root resorption despite extensive retraction, while Group I showed prominent root surface irregularities. Similarly, SEM showed multiple resorption lacunae in Group I, but not in Group II. Conclusions: SSO is an effective and favorable orthodontic approach for major en masse retraction of the maxillary anterior teeth.