• 대한치과교정학회지
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• 제38권1호
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• pp.31-40
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• 2008

최근 절대적인 고정원의 등장으로 다른 부작용 없이 구치부 압하 치료를 가능하게 하였고, 비수술적으로 개방교 합의 심미적인 치료를 가능하게 하였다. 그러나, 이러한 치료법의 장기적인 안정성에 대한 연구는 많이 부족한 실정이다. 이에 본 연구에서는 miniscrew implant 를 이용하여 상악 구치를 압하시켜 치료한 성인 개방교합 환자 11명(남자 1명, 여자 10명) 을 대상으로 치료 전후, 그리고 유지기의 골격성, 치아 치조성 변화를 측모 두부 방사선사진을 이용하여 평가하였으며 계측치의 치료 전후 변화량간의 상관관계와 치료에 의한 변화량과 재발량과의 상관관계를 규명하여 상악구치의 압하를 통해서 개방교합을 치료할 때에 안정성을 평가하였다. 그 결과로 상악 구치는 2.22 mm 압하 (p < 0.001) 가 일어났고, 평균 17.4 개월 유지 후 0.23 mm 의 정출 (p = 0.359) 이 나타났으며, 재발율은 10.36%로 나타났다. 전치부의 수직피개는 평균 5.47 mm 의 증가 (p < 0.01) 가 나타났고 평균 17.4 개월 유지 후 0.99 mm의 감소 (p < 0.05) 가 나타나서, 재발량은 18.10%로 계산되었다. 치료 전후 수치 변화량의 상관분석을 통해 상악 구치 압하량과 하악 평면각 변화량이 상관관계 (p < 0.05) 가 있었다. 치료 전의 개방교합량, 하악 평면각, 전하안면고 경과 치료 후의 수직피개 재발량과는 상관관계가 없었다. 상악 구치 압하량과 수직피개 개선량에서 치료에 의한 변화량과 재발량이 통계적으로 유의한 상관관계를 보였고, 이를 토대로 재발량을 예측할 수 있었다. 이상의 결과를 통하여 성인 개방교합 환자에서 miniscrew implant를 이용한 상악구치부의 압하는 비수술, 심미적 접근방법으로 효율적이고 안정적인 치료방법으로 유용하게 사용할 수 있을 것으로 생각된다.

• 대한치과교정학회지
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• 제35권6호
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• pp.485-494
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• 2005

상악 측절치와 견치의 치근 사이에 식립한 microimplant를 이용하여 상악 전치의 합임과 설측으로의 치근 이동을 얻을 수가 있었으며, 상악 견치와 제1소구치의 치근 사이에 식립한 microimplant를 이용하여 과맹출된 상악 견치를 함입시켰다. 또한 상악 제1, 2대구치의 치근 사이에 식립한 microplant를 이용하여 상악 견치 및 구치의 후방 이동 및 상악 전치의 후방 견인을 시행하였다. Anterior bite plane과 intrusion arch, 그리고 II급 고무 등과 같은 전통적인 방법을 사용하여 하악 전치의 합입 및 구치부의 정출을 얻을 수가 있었으며, 과개 교합 및 상악 전치의 설측 경사가 해소 되면서 하악골이 전방으로 약간 이동하였다. 이와 같이, MIA는 II급 2류 부정교합환자에 있어서 II급 견치 및 구치 관계 그리고 과개 교합을 동시에 해소 하는데 절대적인 고정원을 제공하였다.

• 대한치과교정학회지
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• 제46권5호
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• pp.310-322
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• 2016

Objective: The aim of this study was to determine the optimal loading conditions for pure intrusion of the six maxillary anterior teeth with miniscrews according to alveolar bone loss. Methods: A three-dimensional finite element model was created for a segment of the six anterior teeth, and the positions of the miniscrews and hooks were varied after setting the alveolar bone loss to 0, 2, or 4 mm. Under 100 g of intrusive force, initial displacement of the individual teeth in three directions and the degree of labial tilting were measured. Results: The degree of labial tilting increased with reduced alveolar bone height under the same load. When a miniscrew was inserted between the two central incisors, the amounts of medial-lateral and anterior-posterior displacement of the central incisor were significantly greater than in the other conditions. When the miniscrews were inserted distally to the canines and an intrusion force was applied distal to the lateral incisors, the degree of labial tilting and the amounts of displacement of the six anterior teeth were the lowest, and the maximum von Mises stress was distributed evenly across all the teeth, regardless of the bone loss. Conclusions: Initial tooth displacement similar to pure intrusion of the six maxillary anterior teeth was induced when miniscrews were inserted distal to the maxillary canines and an intrusion force was applied distal to the lateral incisors. In this condition, the maximum von Mises stresses were relatively evenly distributed across all the teeth, regardless of the bone loss.

• 구강회복응용과학지
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• 제20권2호
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• pp.143-150
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• 2004

Endosseous implants have been used to provide anchorage control in orthodontic treatment without the need for special patient cooperation. However these implants have limitation like space requirement, cost, equipments. Recently titanium micro-implant for orthodontic anchorage was introduced. Micro-implants are small enough to place in any area of the alveolar bone, easy to implant and remove, and inexpensive. In addition, orthodontic force application can begin almost immediately after implantation. The mandibular first, maxillary first, mandibula second, and maxillary second molars were the four most commonly missing teeth in adult sample. In case of posterior molar teeth missing, deflective contacts in any position, over time, has produced pathologic change of occlusal scheme because of extrusion of opposing teeth. This case had interocclusal space deficiency by mandibular right molars missing over time. The micro-implants had been used for intrusion of maxillary right molars for interocclusal space. The micro-implant would be absolute anchorage for orthodontic movement. Therefore, the micro-implant would be effective method for correction of occlusal plane.

• 대한치과교정학회지
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• 제43권3호
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• pp.147-158
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• 2013

This article describes the orthodontic treatment of a 31-year-old Korean female patient with gummy smile and crowding. The patient showed excessive gingival display in both the anterior and posterior areas and a large difference in gingival heights between the anterior and posterior teeth in the maxilla. To correct the gummy smile, we elected to intrude the entire maxillary dentition instead of focusing only on the maxillary anterior teeth. Alignment and leveling were performed, and a midpalatal absolute anchorage system as well as a modified lingual arch was designed to achieve posterosuperior movement of the entire upper dentition. The active treatment period was 18 months. The gummy smile and crowding were corrected, and the results were stable at 21 months post-treatment.

• 대한치과교정학회지
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• 제36권5호
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• pp.388-396
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• 2006

전치부 치성 보상기전과 장안모를 보이는 하악전돌증례에서 악교정 수술전 교정치료과정과 치료결과를 보이고자한다. 악교정 수술전 교정치료로 장안모의 해결을 위해 구개 정중부에 mini-implant를 식립하여 상악 구치부를 압하하였고, 하악전치부 치성보상을 해결하기 위해 하악 좌우측 견치와 제1소구치 사이에 mini-implant를 식립하여 하악전치의 순측경사를 유도하였다. 그 결과 하악골 후퇴술만 시행하였음에도 수평, 수직적으로 조화로운 안모를 얻을 수 있었다. 치료기간은 11개월이 소요되었으며, 치료 후 18개월 후에도 안정적인 교합이 유지되었다.

• 대한치과교정학회지
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• 제49권6호
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• pp.349-359
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• 2019

Objective: The aim of this study was to analyze three-dimensional (3D) changes in maxillary dentition in Class II malocclusion treatment using arch wire with continuous tip-back bends or compensating curve, together with intermaxillary elastics by superimposing 3D virtual models. Methods: The subjects were 20 patients (2 men and 18 women; mean age 20 years 7 months ${\pm}$ 3 years 9 months) with Class II malocclusion treated using $0.016{\times}0.022-inch$ multiloop edgewise arch wire with continuous tip-back bends or titanium molybdenum alloy ideal arch wire with compensating curve, together with intermaxillary elastics. Linear and angular measurements were performed to investigate maxillary teeth displacement by superimposing pre- and post-treatment 3D virtual models using Rapidform 2006 and analyzing the results using paired t-tests. Results: There were posterior displacement of maxillary teeth (p < 0.01) with distal crown tipping of canine, second premolar and first molar (p < 0.05), expansion of maxillary arch (p < 0.05) with buccoversion of second premolar and first molar (p < 0.01), and distal-in rotation of first molar (p < 0.01). Reduced angular difference between anterior and posterior occlusal planes (p < 0.001), with extrusion of anterior teeth (p < 0.05) and intrusion of second premolar and first molar (p < 0.001) was observed. Conclusions: Class II treatment using an arch wire with continuous tip-back bends or a compensating curve, together with intermaxillary elastics, could retract and expand maxillary dentition, and reduce occlusal curvature. These results will help clinicians in understanding the mechanism of this Class II treatment.

• 대한치과교정학회지
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• 제45권1호
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• pp.20-28
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• 2015

Objective: The purpose of this study was to observe stress distribution and displacement patterns of the entire maxillary arch with regard to distalizing force vectors applied from interdental miniscrews. Methods: A standard three-dimensional finite element model was constructed to simulate the maxillary teeth, periodontal ligament, and alveolar process. The displacement of each tooth was calculated on x, y, and z axes, and the von Mises stress distribution was visualized using color-coded scales. Results: A single distalizing force at the archwire level induced lingual inclination of the anterior segment, and slight intrusive distal tipping of the posterior segment. In contrast, force at the high level of the retraction hook resulted in lingual root movement of the anterior segment, and extrusive distal translation of the posterior segment. As the force application point was located posteriorly along the archwire, the likelihood of extrusive lingual inclination of the anterior segment increased, and the vertical component of the force led to intrusion and buccal tipping of the posterior segment. Rotation of the occlusal plane was dependent on the relationship between the line of force and the possible center of resistance of the entire arch. Conclusions: Displacement of the entire arch may be dictated by a direct relationship between the center of resistance of the whole arch and the line of action generated between the miniscrews and force application points at the archwire, which makes the total arch movement highly predictable.

• 대한치과교정학회지
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• 제34권2호
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• pp.197-203
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• 2004

골격성 II급 부정교합을 치료하는데 있어서, Tweed-Merrifield directional force technology는 시계 반대 방향으로의 양호한 골격적 변화 및 균형 잡힌 안모를 얻는데 기여하고 있다. 이는 적절한 방향으로의 J-hook을 통한 headgear force의 사용이 필수적이다. 따라서 환자의 협조에 대한 의존이 절대적이므로 약간의 문제점이 있는 것 또한 사실이다. 하지만 최근 skeletal anchorage를 이용하여 환자의 협조를 최소화하면서도 보다 효과적으로 고정원 보강을 할 수 있는 방법이 많이 시행되고 있어 이를 보완 할 수 있게 되었다. 저자는 HPJH(high pull J-hook)과 skeletal anchorage를 병용하여 directional force를 적용한 결과 상악 구치부에서의 고정원 보강과 상악 전치부의 토크 조절 및 mandibular response를 얻음으로써 양호한 안모의 균형을 얻을 수가 있었다. 이 치료 결과로 보아 skeletal anchorage는 HPJH을 대신하여 상악 견치 및 전치부 견인시 상악 구치부의 전후적 및 수직적 고정원 보강 역할을 할 수 있을 것으로 생각된다 상악 전치부 견인시 상악 전치부의 토크 조절, 압하 및 치체이동을 위해 HPJH을 사용하였지만, 이 또한 mini 혹은 microscrew로 대체한다면 환자의 협조를 최소화하면서도 양호한 치료결과를 얻을 수 있을 것으로 생각된다.

• 대한치과교정학회지
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• 제42권6호
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• pp.280-290
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• 2012

Objective: This study aimed to compare the effects of conventional and orthodontic mini-implant (OMI) anchorage on tooth movement and arch-dimension changes in the maxillary dentition in Class II division 1 (CII div.1) patients. Methods: CII div.1 patients treated with extraction of the maxillary first and mandibular second premolars and sliding mechanics were allotted to conventional anchorage group (CA, n = 12) or OMI anchorage group (OA, n = 12). Pre- and post-treatment three-dimensional virtual maxillary models were superimposed using the best-fit method. Linear, angular, and arch-dimension variables were measured with software program. Mann-Whitney U-test and Wilcoxon signed-rank test were performed for statistical analysis. Results: Compared to the CA group, the OMI group showed more backward movement of the maxillary central and lateral incisors and canine (MXCI, MXLI, MXC, respectively; 1.6 mm, p < 0.001; 0.9 mm, p < 0.05; 1.2 mm, p < 0.001); more intrusion of the MXCI and MXC (1.3 mm, 0.5 mm, all p < 0.01); less forward movement of the maxillary second premolar, first, and second molars (MXP2, MXM1, MXM2, respectively; all 1.0 mm, all p < 0.05); less contraction of the MXP2 and MXM1 (0.7 mm, p < 0.05; 0.9 mm, p < 0.001); less mesial-in rotation of the MXM1 and MXM2 ($2.6^{\circ}$, $2.5^{\circ}$, all p < 0.05); and less decrease of the inter-MXP2, MXM1, and MXM2 widths (1.8 mm, 1.5 mm, 2.0 mm, all p < 0.05). Conclusions: In treatment of CII div.1 malocclusion, OA provided better anchorage and less arch-dimension change in the maxillary posterior teeth than CA during en-masse retraction of the maxillary anterior teeth.