• Title/Summary/Keyword: skeletal plate

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Physiochemical Characteristics of Calcium Supplement Manufactured using Starfish (불가사리를 이용하여 제조한 칼슘보충제의 이화학적 특성)

  • Park, Hee-Yeon;Lee, Jung Im;Nam, Ki-Ho;Jang, Mi-Soon
    • Food Science and Preservation
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    • v.19 no.5
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    • pp.727-734
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    • 2012
  • For developing calcium supplement from the harmful marine organism starfish, the physiochemical property of the powdered starfish skeletal plate and the hydrolysis condition of the starfish digestive enzyme were studied. The optimal hydrolysis condition of the starfish digestive enzymes was at $55^{\circ}C$ for 12 h. The bulk densities of the powdered starfish skeletal plates of Asterias amurensis and Asterina pectinifera were $1.1{\pm}0.0$ and $1.2{\pm}0.0g/cm^3$, respectively. As for the median size, the values were 10.738 and $11.799{\mu}m$, respectively. According to the added concentration of sodium polyacrylate, the dispersibility rate of the powdered starfish skeletal plate was shown to be 6h at 0.0%, 3 days at 0.1%, 20 days at 0.2%, and until 30 days at 0.4%. The elementary composition of the powdered starfish skeletal plates from A. amurensis and A. pectinifera mainly consisted of calcium, and it formed 98.95 and 98.52% of the powdered starfish skeletal plates, respectively. The results of the X-ray diffraction (XRD) analysis showed that they were present in the form of $CaCO_3$. Based on these results, it is suggested that starfish skeletal plate can be utilized as a functional material for a calcium supplement.

A cephalometric comparison of Skeletal Class III malocclusion and Cleft lip and palate patients (골격성 제 III급 부정교합환자와 구순구개열환자의 두부방사선계측치의 비교)

  • Baik Hyoung-Seon;Yu Hyung-Seog;Jeon Jai-min
    • Korean Journal of Cleft Lip And Palate
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    • v.6 no.2
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    • pp.59-67
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    • 2003
  • A cephalometric study was performed to reveal differences between skeletal Class III malocclusion patients and cleft lip and palate patients, The material for this study consisted of 16 males (mean age 19.8, range 17-29) and 9 females(mean age 19.4, range 16-27) with cleft lip and palate, and 222 Skeletal Class III malocclusion patients(males 106, females 116), Cephalometric tracing and measurements were done by one investigator. Results were followed: 1. Cleft lip and palate group had more retrusive maxilla than the skeletal Class III malocclusion group. 2, Cleft lip and palate group had smaller effective maxillary and mandibular length than skeletal Class III malocclusion group, and the difference was more prominent in the mandible than in the maxilla. 3. Dental compensation was not observed in the upper incisors of cleft lip and palate group and in the lower incisors it was smaller than skeletal Class III group. 4, In the Gonial angle and lower anterior facial height values, there was no significant difference between cleft lip and palate and skeletal Class III malocclusion group. These results can be used in orthodontic treatment planning and orthognathic surgery for the cleft lip and palate patients.

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A study on the Growth, Skeletal Maturity of Children with Obesity (비만 소아의 성장과 골성숙도에 관한 임상적 연구)

  • Kim, Cho-Young;Chang, Gyu-Tae
    • Journal of Korean Medicine for Obesity Research
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    • v.12 no.1
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    • pp.9-19
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    • 2012
  • Objectives This study was designed to find out the relationships between obesity and growth, skeletal maturity among children by analyzing body composition and bone age. Methods Subjects were composed of 577 children from six years to seventeen years of age, without any other diseases related to growth, were measured their body composition and bone age. Results As obesity index was increased, the RH-MPH(%) and skeletal maturity significantly was also increased. The RH-MPH(%) of the obesity group was significantly increased than that of normal weight group; the skeletal maturity was more increased in th obesity group. It means the recent height of obese children was more taller than that of inherited from the parents, while skeletal maturity of obese children was more rapidly progressing. The RH-MPH(%) was increased in children who revealed stage of second sexual character; skeletal maturity was decreased in children who developed secondary sexual character. Conclusions Obesity children might be taller than what it supposed to be. However, obesity could cause the increase of skeletal maturity. It means the growth plate of obese children has been closed early.

Application and anatomical considerations of skeletal temporary anchorage devices (TADs) in contemporary orthodontics (임상가를 위한 특집 1 - 최신 교정치료에서의 Skeletal Temporary Anchorage Devices (TADs)의 적용과 해부학적 고려사항)

  • Han, Seong Ho;Shin, Hyerin;Park, Young-Seok
    • The Journal of the Korean dental association
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    • v.52 no.9
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    • pp.532-540
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    • 2014
  • In contemporary orthodontic treatment skeletal temporary anchorage devices (TADs) are routinely used as an anchorage reinforcement to provide improved anchorage control with reduced requirement for patient's compliance. For past few decades, various types of TADs have been explored and their clinical application has been expanded. Therefore, the purpose of this article is to present three major types of orthodontic skeletal anchorage devices and discuss their rationale, clinical procedure, insertion site, and potential complications as well as their management.

INFLUENCE OF MINIPLATE SHAPES AS SKELETAL ANCHORAGE FOR APPLICATION OF ORTHOPEDIC FORCE: A THREE-DIMENSIONAL FINITE ELEMENT ANALYSIS (악정형력 적용을 위한 골내 고정원으로서 미니플레이트 형상의 영향: 3차원 유한요소법적 연구)

  • Lee, Nam-Ki;Baek, Seung-Hak;Choi, Dong-Soon;Park, Young-Wook;Kim, Ji-Hyuck;Cha, Bong-Kuen
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.30 no.4
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    • pp.345-352
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    • 2008
  • Purpose: This study was performed to evaluate the stress distribution in the bone and the displacement distribution of the miniscrew under orthopedic force with two different types of miniplate design as skeletal anchorage for orthopedic treatment. Materials and methods: Finite element models were made for 6-hole miniplate (0.8mm in thickness), which were designed in two different shapes-one is curvilinear shaped (C plate, Jeil Medical Co., Korea) and another, Y shaped (Y plate), fixed with 3 pieces of miniscrew 2mm-diameter and 6mm-long respectively. A traction force of 4 N was applied in $0^{\circ}$, $30^{\circ}$ and $60^{\circ}$ to imaginary axis connecting two unfixed distalmost holes of the miniplate. Results: The maximum von Mises stress in the bone was much greater in the cortical portion rather than in the cancellous portion. C plate showed greater maximum von Mises stress in the cortical bone than Y plate. The maximum displacement of the miniscrew was greater in C plate than Y plate. The more increased the angle of the applied orthopedic force, the greater maximum von Mises stress in the bone and maximum displacement of the miniscrew. It was observed that in C plate, the von Mises stress in the bone and displacement of the miniscrew were distributed around the distalmost screw-fixed area. Conclusions: The results suggest that Y plate should have the advantage over C plate and in the placement of the miniplate, its imaginary axis should be placed as parallel as possible to the direction of orthopedic force to obtain its primary stability.

Displacement and stress distribution of the maxillofacial complex during maxillary protraction using palatal plates: A three-dimensional finite element analysis

  • Eom, Jusuk;Bayome, Mohamed;Park, Jae Hyun;Lim, Hee Jin;Kook, Yoon-Ah;Han, Seong Ho
    • The korean journal of orthodontics
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    • v.48 no.5
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    • pp.304-315
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    • 2018
  • Objective: The purpose of this study was to analyze initial displacement and stress distribution of the maxillofacial complex during dentoskeletal maxillary protraction with various appliance designs placed on the palatal region by using three-dimensional finite element analysis. Methods: Six models of maxillary protraction were developed: conventional facemask (Type A), facemask with dentoskeletal hybrid anchorage (Type B), facemask with a palatal plate (Type C), intraoral traction using a Class III palatal plate (Type D), facemask with a palatal plate combined with rapid maxillary expansion (RME; Type E), and Class III palatal plate intraoral traction with RME (Type F). In Types A, B, C, and D, maxillary protraction alone was performed, whereas in Types E and F, transverse expansion was performed simultaneously with maxillary protraction. Results: Type C displayed the greatest amount of anterior dentoskeletal displacement in the sagittal plane. Types A and B resulted in similar amounts of anterior displacement of all the maxillofacial landmarks. Type D showed little movement, but Type E with expansion and the palatal plate displayed a larger range of movement of the maxillofacial landmarks in all directions. Conclusions: The palatal plate served as an effective skeletal anchor for use with the facemask in maxillary protraction. In contrast, the intraoral use of Class III palatal plates showed minimal skeletal and dental effects in maxillary protraction. In addition, palatal expansion with the protraction force showed minimal effect on the forward movement of the maxillary complex.

New approach of maxillary protraction using modified C-palatal plates in Class III patients

  • Kook, Yoon-Ah;Bayome, Mohamed;Park, Jae Hyun;Kim, Ki Beom;Kim, Seong-Hun;Chung, Kyu-Rhim
    • The korean journal of orthodontics
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    • v.45 no.4
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    • pp.209-214
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    • 2015
  • Maxillary protraction is the conventional treatment for growing Class III patients with maxillary deficiency, but it has undesirable dental effects. The purpose of this report is to introduce an alternative modality of maxillary protraction in patients with dentoskeletal Class III malocclusion using a modified C-palatal plate connected with elastics to a face mask. This method improved skeletal measurements, corrected overjet, and slightly improved the profile. The patients may require definitive treatment in adolescence or adulthood. The modified C-palatal plate enables nonsurgical maxillary advancement with maximal skeletal effects and minimal dental side effects.

Pattern of microimplant displacement during maxillary skeletal expander treatment: A cone-beam computed tomography study

  • Ney Paredes;Ausama Gargoum;Ramon Dominguez-Mompell;Ozge Colak;Joseph Bui;Tam Duong;Maya Giannetti;Fernanda Silva;Kendra Brooks;Won Moon
    • The korean journal of orthodontics
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    • v.53 no.5
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    • pp.289-297
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    • 2023
  • Objective: To analyze the microimplant (MI) displacement pattern on treatment with a maxillary skeletal expander (MSE) using cone-beam computed tomography (CBCT). Methods: Thirty-nine participants (12 males and 27 females; mean age, 18.2 ± 4.2 years) were treated successfully with the MSE II appliance. Their pre- and post-expansion CBCT data were superimposed. The pre- and post-expansion anterior and posterior inter-MI angles, neck and apical inter-MI distance, plate angle, palatal bone thickness at the MI positions, and suture opening at the MI positions were measured and compared. Results: The jackscrew plate was slightly bent in both anterior and posterior areas. There was no significant difference in the extent of suture opening between the anterior and posterior MIs (P > 0.05). The posterior MI to hemiplate line was greater than that anteriorly (P < 0.05). The apical distance between the posterior MIs was greater than that anteriorly (P < 0.05). The palatal thickness at the anterior MIs was significantly greater than that posteriorly (P > 0.01). Conclusions: In the coronal plane, the angulation between the anterior MIs in relation to the jackscrew plate was greater than that between the posterior MIs owing to the differential palatal bone thickness.

Subclassification of Skeletal Class II Malocclusion of Korean Adults Using Cluster Analysis (군집분석을 통한 한국인 성인 골격성 제 II급 부정교합의 아분류)

  • Ahn, Kwang-Seok;Baik, Hyoung-Seon;Kim, Kyung-Ho;Kim, Baek-Il;Lee, Kee-Joon
    • Korean Journal of Cleft Lip And Palate
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    • v.14 no.1_2
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    • pp.1-18
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    • 2011
  • Skeletal malocclusion is the result of abnormal dimension and alignment of each skeletal component. Understanding on these mechanisms may help to elucidate the etiology of skeletal malocclusion and to establish population-oriented treatment plans. Attempts to subdivide the Angle's classification have been performed for Class III malocclusion, while few studies have been conducted for Class II malocclusion despite recent growing interests in Class II malocclusion. 200 adults (88 male, 112 female) with skeletal Class II malocclusion were collected and subdivided using cluster analysis, using the measurements representing the dimension and the alignment of each facial skeletal component. The properties of each cluster was grouped within the subjects and a comparison between the subjects and the control group (38 male, 35 female) with normal occlusion was performed. Six clusters were finally recognized in each male and female groups. The clusters in both genders were mainly characterized by the cranial base alignment, dimension of the posterior cranial base, dimension of the mandibular ramus and the degree of mandibular rotation. The results implicate that active treatment of mandible rather than the nasomaxillary complex may be primarily considered for the correction of Korean Class II skeletal pattern.

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The Effect of a Condylar Repositioning Plate on Condylar Position and Relapse in Two-Jaw Surgery

  • Jung, Gyu Sik;Kim, Taek Kyun;Lee, Jeong Woo;Yang, Jung Dug;Chung, Ho Yun;Cho, Byung Chae;Choi, Kang Young
    • Archives of Plastic Surgery
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    • v.44 no.1
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    • pp.19-25
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    • 2017
  • Background Numerous condylar repositioning methods have been reported. However, most of them are 2-dimensional or are complex procedures that require a longer operation time and a highly trained surgeon. This study aims to introduce a new technique using a condylar repositioning plate and a centric relation splint to achieve a centric relationship. Methods We evaluated 387 patients who had undergone surgery for skeletal jaw deformities. During the operation, a centric relation splint, intermediate splint, final centric occlusion splint, and condylar repositioning plate along with an L-type mini-plate for LeFort I osteotomy or a bicortical screw for bilateral sagittal split ramus osteotomy were utilized for rigid fixation. The evaluation included: a physical examination to detect preoperative and postoperative temporomandibular joint dysfunction, 3-dimensional computed tomography and oblique transcranial temporomandibular joint radiography to measure 3-dimensional condylar head movement, and posteroanterior and lateral cephalometric radiography to measure the preoperative and postoperative movement of the bony segment and relapse rate. Results A 0.3% relapse rate was observed in the coronal plane, and a 2.8% relapse rate in the sagittal plane, which is indistinguishable from the dental relapse rate in orthodontic treatment. The condylar repositioning plate could not fully prevent movement of the condylar head, but the relapse rate was minimal, implying that the movement of the condylar head was within tolerable limits. Conclusions Our condylar repositioning method using a centric relation splint and miniplate in orthognathic surgery was found to be simple and effective for patients suffering from skeletal jaw deformities.