• 제목/요약/키워드: Mini-plate

검색결과 51건 처리시간 0.019초

Comparison of postoperative changes in the distal and proximal segments between conventional and sliding mini-plate fixation following mandibular setback

  • Kim, Seong-Sik;Kwak, Kyoung-Ho;Ko, Ching-Chang;Park, Soo-Byung;Son, Woo-Sung;Kim, Yong-Il
    • 대한치과교정학회지
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    • 제46권6호
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    • pp.372-378
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    • 2016
  • Objective: The purpose of the present study was to evaluate the postoperative three-dimensional (3D) changes in the proximal segments after mandibular setback sagittal split ramus osteotomy and to compare the changes between the conventional mini-plate fixation and semi-rigid sliding plate fixation. Methods: Cone-beam computed tomography (CBCT) images were used to evaluate the postoperative 3D changes in the proximal segments during the healing process. CBCT images were superimposed using the symphysis and the lower anterior mandible as references. Results: There were no statistically significant differences between the conventional mini-plate and semi-rigid sliding plate groups (p > 0.05). With respect to the distribution of changes greater than 2 mm in the landmarks, the right condylion, right coronoid process, and left condylion showed ratios of 55.6%, 50.0%, and 44.4%, respectively, in the semi-rigid sliding plate group; however, none of the landmarks showed ratios greater than 30% in the conventional mini-plate group. Conclusions: There were no statistically significant differences in postoperative changes in the segments between the conventional mini-plate and semi-rigid sliding plate groups. Nevertheless, while selecting the type of fixation technique, clinicians should consider that landmarks with greater than 2 mm changes were higher in the semi-rigid sliding plate group than in the conventional mini-plate group.

An Experimental Study on Wave Absorber Performance of Combined Punching Plate in a Two-Dimensional Mini Wave Tank

  • Jung, Hyen-Cheol;Koo, Weoncheol
    • 한국해양공학회지
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    • 제35권2호
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    • pp.113-120
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    • 2021
  • In order to perform a precise wave tank experiment, it is necessary to maintain the incident wave generated by the wavemaker in a steady state and to effectively remove the reflected waves. In this paper, a combined sloping-wall-type punching plate wave absorber was proposed to attenuate reflected waves effectively in a two-dimensional mini wave tank. Using the four-point reflection separation method, the reflected waves were measured to determine the reflection coefficients. Experiments were conducted under various punching plate porosities, sloping plate angles, and incident wave conditions to evaluate the performance of the combined punching plate wave absorber. The most effective wave absorbing performance was achieved when the porosity was 10% and the inclination angle of the punching plate was 18.6° under the present condition. It was also found that the installation of the sloping plate could improve the wave attenuation performance by generating the shoaling effect of the incident wave.

Channel Gap Measurements of Irradiated Plate Fuel and Comparison with Post-Irradiation Plate Thickness

  • James A. Smith;Casey J. Jesse;William A. Hanson;Clark L. Scott;David L. Cottle
    • Nuclear Engineering and Technology
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    • 제55권6호
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    • pp.2195-2205
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    • 2023
  • One of the salient nuclear fuel performance parameters for new fuel types under development is changes in fuel thickness. To test the new commercially fabricated U-10Mo monolithic plate-type fuel, an irradiation experiment was designed that consisted of multiple mini-plate capsules distributed within the Advanced Test Reactor (ATR) core, the mini-plate 1 (MP-1) experiment. Each capsule contains eight mini-plates that were either fueled or "dummy" plates. Fuel thickness changes within a fuel assembly can be characterized by measuring the gaps between the plates ultrasonically. The channel gap probe (CGP) system is designed to measure the gaps between the plates and will provide information that supports qualification of U-10Mo monolithic fuel. This study will discuss the design and the results from the use of a custom-designed CGP system for characterizing the gaps between mini-plates within the MP-1 capsules. To ensure accurate and repeatable data, acceptance and calibration procedures have been developed. Unfortunately, there is no "gold" standard measurement to compare to CGP measurements. An effort was made to use plate thickness obtained from post-irradiation measurements to derive channel gap estimates for comparison with the CGP characterization.

Neer 분류 제 2형 원위부 쇄골 골절의 mini-T형 금속판 고정 (Mini-T Plate Fixation for Neer Type II Distal Clavicle Fracture)

  • 염재광;이상림;라호종
    • Clinics in Shoulder and Elbow
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    • 제12권1호
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    • pp.1-6
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    • 2009
  • 목적: 불안정성 쇄골 원위부 골절에 대하여 mini-T 금속판을 이용한 수술적 치료를 시행 후 임상적 및 방사선학적 결과를 알아보고자 하였다. 대상 및 방법: 2004년 12월부터 2007년 7월까지 쇄골 원위부 골절 중 Neer 분류 제 2형인 불안정성 골절에 대하여 mini-T 금속판을 이용한 수술을 시행한 환자 중 1년 이상 추시 관찰이 가능하였던 15예를 대상으로 임상적 및 방사선학적 결과를 분석하였다. 결과: 방사선학적 골유합은 평균 3.1개월(3~4개월)에 이루어졌으며 심부 감염이나 고정 실패 등의 합병증은 없었다. 최종 추시 시 미국 견주관절학회 평가 점수(ASES score)는 평균 97점(85~100점)으로 양호한 결과를 보였으며, 견관절의 운동 범위도 1예를 제외하고 모든 예에서 정상으로 회복된 소견을 보였다. 결론: 불안정성 쇄골 원위부 골절에 대하여 mini-T 금속판을 이용한 수술 방법은 양호한 임상적 및 방사선학적 결과를 보여 좋은 수술 방법으로 사료되나 더 많은 증례를 통한 장기적인 결과 분석이 필요하리라 생각된다.

Biomechanical analysis of distalization of mandibular molars by placing a mini-plate: A finite element study

  • Park, Myungsoon;Na, Yonghyun;Park, Minbong;Ahn, Janghoon
    • 대한치과교정학회지
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    • 제47권5호
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    • pp.289-297
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    • 2017
  • Objective: The objective of this study was to analyze the patterns of tooth movements when distalization of mandibular molars using a mini-plate took place. A finite element analysis was applied to analyze patterns of tooth movements. Methods: The model of the mandible and teeth were used to build a finite element analysis model, and a mini-plate was inserted in the mandibular ramus. Two different orthodontic forces were established for displacement of mandibular molars. Orthodontic forces were applied at the level of the bracket and at the level of the cemento-enamel junction in the mandibular canine respectively. Results: Applying orthodontic forces at the level of the cemento-enamel junction resulted in a greater biomechanical bodily movement in distalization of the mandibular molars compared to when the orthodontic forces were applied at the level of the bracket. Applying orthodontic forces to the cemento-enamel junction also resulted in unwanted greater extrusive movements in distalization of the mandibular molars compared to the bracket level. Conclusions: With considering the mode of orthodontic teeth movement, applying different vertical orthodontic forces for distalization of mandibular molars can lead to more effective distalization of teeth.

하악골 과두하부 골절 실험모델에서 견고정을 위한 플레이트 고정방법 연구 (Study of the Plating Methods in the Experimental Model of Mandibular Subcondyle Fracture)

  • 이원;강동희
    • 대한두개안면성형외과학회지
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    • 제12권1호
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    • pp.12-16
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    • 2011
  • Purpose: This study examined the biomechanical stability of four different plating techniques in the experimental model of mandibular subcondyle fracture. Methods: Twenty standardized bovine tibia bone samples ($7{\times}1.5{\times}1.0cm$) were used for this study. Each of the four sets of tibia bone was cut to mimic a perpendicular subcondyle fracture in the center area. The osteotomized tibia bone was fixed using one of four different fixation groups (A,B,C,D). The fixation systems included single 2.0 mm 4 hole mini adaption plate (A), single 2.0 mm 4 hole dynamic compression miniplate (B), double fixation with 2.0 mm 4 hole mini adaption plate (C), double fixation with a 2.0 mm 4 hole mini adaption plate and 2.0 mm 4 hole dynamic compression miniplate (D). A bending force was applied to the experimental model using a pressure machine (858 table top system, $MTS^{(R)}$) until failure occurred. The load for permanent deformation, maximum load of failure were measured in the load displacement curve with the chart recorder. Results: Double fixation with a 2.0 mm 4 hole mini adaption plate and a 2.0 mm 4 hole dynamic compression miniplate (D) applied to the anterior and posterior regions of the subcondyle experimental model showed the highest load to failure. Conclusion: From this study, double fixation with an adaption plate and dynamic compression miniplate fixation technique produced the greatest biomechanical stability. This technique may be considered a useful means of fixation to reduce the postoperative internal maxillary fixation period and achieve early mobility of the jaw.

Mini-plate removal in maxillofacial trauma patients during a five-year retrospective study

  • Park, Hyun-Chun;Kim, Su-Gwan;Oh, Ji-Su;You, Jae-Seek;Kim, Won-Gi
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • 제42권4호
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    • pp.182-186
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    • 2016
  • Objectives: The purpose of this study was to analyze the incidence of indications for the removal of mini-plates over a five-year period in maxillofacial trauma patients. Materials and Methods: The medical records of 530 patients who underwent treatment with mini-plate fixation after maxillofacial trauma were reviewed for a five-year period (May 2007 to May 2012). Patients were evaluated concerning the number of mini-plates removed, age and gender distributions, time between insertion and removal, indication for removal, and site of removal. Results: The plates of 120 patients were removed (26 females and 94 males). The removal rate was 22.6%. The most frequent indication for removal was patient demand (81.7%), followed by tooth extraction (7.5%), and pain (3.3%). The most frequent removal site was the mandible (95.0%). Conclusion: The number of mini-plates removed was small, and the most common indication for removal was patient demand. There is no evidence to support a recommendation for the routine removal of titanium mini-plates.

류마토이드 관절염 환자의 족무지 외반증에 대한 제 1 중족 족지 관절 고정술 -지연 나사못과 배부 금속판을 이용한 치험- (Arthrodesis of the First metatarsophalangeal joint for Rheumatoid arthritis, using a lag screw and dorsal plate)

  • 성일훈;이형상;황건성;박기철
    • 대한족부족관절학회지
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    • 제5권2호
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    • pp.142-148
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    • 2001
  • Purpose: To investigate the short term result of the first metatarsophalangeal arthrodesis for treating the hallux valgus deformity of rheumatoid arthritis, using a lag screw and dorsal mini-plate. Materials and Methods: From December 1999 to September 2001, The first metatarsophalangeal arthrodesis of 14 cases (9 patients) was underwent, using a lag screw and dorsal mini-plate. The follow-up period was averaged in 14.6 months. The subjective findings with respect to pain, functional aspect of ability to stand and walk, and to shoe-wearing were evaluated. The objective findings, such as the gross alignment and the radiological measurements for the hallux valgus angle, 1,2 intermetatarsal angle, and dorsiflexion angle were also studied. Results: After the arthrodesis of the first metatarsophalangeal joint, the subjective improvement in pain, function and alignment was graded as excellent in seven (50%) feet, good in seven (50%) feet, and fair or poor in none. The hallux valgus angle and 1,2 intermetatarsal angle were reduced from $44.1{\pm}7.1$ and $15.5{\pm}6.2$ degrees to $13.6{\pm}2.6$ and $10.2{\pm}2.2$ degrees respectively. The dorsiflexion angle was measured in $20.3{\pm}3.7$ degrees after the fusion. The radiological fusion was observed at average 8 weeks after the operation in all cases. The overall complication of the procedure was few, except the delayed wound healing in one. Conclusion: The arthrodesis of the first metatarsophalangeal joint using a lag screw and dorsal mini-plate was regarded as an excellent method of various operative modalities to correct the rheumatoid hallux valgus deformity.

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