교정용 미니임플란트의 식립각도에 따른 간접골성 고정원의 효과에 대한 유한요소 해석 Effects of the Angulation of Orthodontic Mini-Implant as an Indirect Anchorage : A Three-Dimensional Finite Element Analysis원문보기
구치부 가위교합을 개선하기 위한 여러 방법 중, 교정용 미니임플란트(OMI)와 조합된 Dragon helix를 이용한 방법이 이전에 소개된 바 있으며 이는 간접 골성고정원의 역할이 중요하다. 이에 본 연구에서는 간접골성고정원으로 사용된 OMI의 식립각도에 따라 나타나는 구치부의 치근에 나타나는 응력분포와 OMI의 표면에서의 응력 분포 및 변위를 유한요소 해석으로 비교하고자 하였다. 상악 제1대구치와 상악 제2소구치의 치근 사이에 OMI의 식립 각도를 골 표면에 대하여, $45^{\circ}$, $60^{\circ}$, $90^{\circ}$으로 변화시키면서 최대응력분포와 변위를 관찰하였다. OMI의 식립 각도가 $90^{\circ}$일 때 상악 제1대구치와 상악 제2대구치의 구개 치근첨에 최대응력분포가 나타났고, 상악 제1대구치에서는 협측으로 변위의 양이 가장 적게 나타났으며, 상악 제2대구치에서는 함입 및 구개측으로의 변위량이 가장 크게 나타났다. OMI에서는 식립각도가 감소됨에 따라 최대 응력분포가 나사첨 부분으로 이동되었으며, 그에 따라 OMI의 변위량은 증가하였다. 이상의 결과로 OMI의 식립각도가 $90^{\circ}$일 때 고정원의 역할이 최대가 되었으며, 구치부 가위교합의 개선 효과가 가장 크게 나타남을 알 수 있었다.
구치부 가위교합을 개선하기 위한 여러 방법 중, 교정용 미니임플란트(OMI)와 조합된 Dragon helix를 이용한 방법이 이전에 소개된 바 있으며 이는 간접 골성고정원의 역할이 중요하다. 이에 본 연구에서는 간접골성고정원으로 사용된 OMI의 식립각도에 따라 나타나는 구치부의 치근에 나타나는 응력분포와 OMI의 표면에서의 응력 분포 및 변위를 유한요소 해석으로 비교하고자 하였다. 상악 제1대구치와 상악 제2소구치의 치근 사이에 OMI의 식립 각도를 골 표면에 대하여, $45^{\circ}$, $60^{\circ}$, $90^{\circ}$으로 변화시키면서 최대응력분포와 변위를 관찰하였다. OMI의 식립 각도가 $90^{\circ}$일 때 상악 제1대구치와 상악 제2대구치의 구개 치근첨에 최대응력분포가 나타났고, 상악 제1대구치에서는 협측으로 변위의 양이 가장 적게 나타났으며, 상악 제2대구치에서는 함입 및 구개측으로의 변위량이 가장 크게 나타났다. OMI에서는 식립각도가 감소됨에 따라 최대 응력분포가 나사첨 부분으로 이동되었으며, 그에 따라 OMI의 변위량은 증가하였다. 이상의 결과로 OMI의 식립각도가 $90^{\circ}$일 때 고정원의 역할이 최대가 되었으며, 구치부 가위교합의 개선 효과가 가장 크게 나타남을 알 수 있었다.
The purpose of this study was to investigate the displacement and pattern of stress distribution on periodontal ligaments of maxillary first and second molar, and on orthodontic mini-implant (OMI) surface, according to three different insertion angles to the bone surface of OMI using Dragon helix ap...
The purpose of this study was to investigate the displacement and pattern of stress distribution on periodontal ligaments of maxillary first and second molar, and on orthodontic mini-implant (OMI) surface, according to three different insertion angles to the bone surface of OMI using Dragon helix appliance, which is a newly introduced scissors-bite correcting appliance. OMI were placed between second premolar and first molar with three different insertion angles (45, 60, 90 degrees). Displacement and maximum stress distribution area (MSDA) were analyzed by finite element analysis. When the insertion angle to the alveolar bone surface was 90 degrees, maxillary first and second molar both exhibited MSDA at the palatal root apex. Maxillary first molar did not show any significant displacement, while the second molar exhibited intrusive and palatal displacement. On the OMI, as the insertion angle decreased, the MSDA shifted towards the tip, and the amount of displacement had increased. When the OMI was inserted at a 90 degree angle, anchor loss was minimized and scissors-bite correcting effect was maximized.
The purpose of this study was to investigate the displacement and pattern of stress distribution on periodontal ligaments of maxillary first and second molar, and on orthodontic mini-implant (OMI) surface, according to three different insertion angles to the bone surface of OMI using Dragon helix appliance, which is a newly introduced scissors-bite correcting appliance. OMI were placed between second premolar and first molar with three different insertion angles (45, 60, 90 degrees). Displacement and maximum stress distribution area (MSDA) were analyzed by finite element analysis. When the insertion angle to the alveolar bone surface was 90 degrees, maxillary first and second molar both exhibited MSDA at the palatal root apex. Maxillary first molar did not show any significant displacement, while the second molar exhibited intrusive and palatal displacement. On the OMI, as the insertion angle decreased, the MSDA shifted towards the tip, and the amount of displacement had increased. When the OMI was inserted at a 90 degree angle, anchor loss was minimized and scissors-bite correcting effect was maximized.
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가설 설정
Stress distribution shown on the PDL of the maxillary first molar is shown on Fig 2. The color changes from blue to red indicates stress increase. The MSDA was on the buccal apex in group 1 and 2, whereas on the palatal apex in group 3 of the maxillary first molar.
제안 방법
The OMI was inserted in an angle of 45°, 60°, and 90° to the alveolar bone surface in group 1, 2, and 3, respectively. Stress distribution and displacement of the periodontal ligament of maxillary first and second molar and the surface of OMI were analyzed by finite element analysis with Ansys Ⓡ version 11 and HP workstation XW 6400 (Zeon 1.6Ghz *2 CPU, Ram 4G) Von Mises stress of the OMI and maxillary first and second molar were reported to evaluate the stress distribution of the objects. In the displacement graph, axis of the OMI (from center of the head to screw end tip) and upper maxillary first and second molar (from palatal cusp tip to palatal root apex) were used to observe the amount and pattern of displacements of the objects.
성능/효과
In this study, insertion angle of 90 degrees showed the most favorable stress distribution aspect and least displacement to the maxillary first molar, which was the anchor tooth. MSDA of the maxillary second molar was on the palatal root apex when the insertion angle of OMI was 90 degrees, MSDA indicating efficient intrusion.
참고문헌 (25)
Yun SW, Lim WH, Chong DR, Chun YS. Scissors- bite correction on second molar with a dragon helix appliance. Am J Orthod Dentofacial Orthop 2007; 132:842-847.
Orton-Gibbs S, Orton S, Orton H. Eruption of third permanent molars after the extraction of second permanent molars. Part 2: Functional occlusion and periodontal status. Am J Orthod Dentofacial Orthop 2001;119:239-244.
Kucher G, Weiland FJ. Goal-oriented positioning of upper second molars using the palatal intrusion technique. Am J Orthod Dentofacial Orthop 1996;110:466-468.
Chun YS, Row J, Suh MS, Park IK. An experimental study on the dymamic tooth moving effects of two precision ligual arches(PLA) for correction of posterior scissor bite by the Calorific machine Korean J Orthod 1998;24:721-733.
Park HS, Kwon OW, Sung JH. Uprighting second molar with micro-implant anchorage. J Clin Orthod 2004;38:100-103.
Miyawaki S, Koyama I, Inoue M, Mishima K, Sugahara T, Takano-Yamamoto T. Factors associated with the stability of titanium screws placed in the posterior region for orthodontic anchorage. Am J Orthod Dentofacial Orthop 2003;124:373-378.
Deguchi T, Nasu M, Murakami K, Yabuuchi T, Kamioka H, Takano-Yamamoto T. Quantitative evaluation of cortical bone thickness with computed tomographic scanning for orthodontic implants. Am J Orthod Dentofacial Orthop 2006;129:721 e727-712.
Kim HJ, Yun HS, Park HD, Kim DH, Park YC. Soft-tissue and cortical-bone thickness at orthodontic implant sites. Am J Orthod Dentofacial Orthop 2006;130:177-182.
Kim SH, Yoon HG, Choi YS, Hwang EH, Kook YA, Nelson G. Evaluation of interdental space of the maxillary posterior area for orthodontic mini-implants with cone-beam computed tomography. American Journal of Orthodontics and Dentofacial Orthopedics 2009;135:635-641.
Park YC, Kim JK, Lee JS. Atlas of contemporary orthodontics. Seoul: Shinheung international 2006.
Kim MJ, Park SH, Kim HS, Mo SS, Sung SJ, Jang GW et al. Effects of the position of orthodontic mini- implant in Dragon helix appliance : a three-dimensional finite element analysis. Korean J Orthod 2011;41:191-199.
Park CK, Yang YS. A three-dimensional finite element analysis on the location of center of resistance during intrusion of upper anterior teeth 1997;27:259-272.
Byoun NY, Nam EH, Yoon YA, Kim IK. Three- dimensional finite element analysis for stress distribution on the diameter of orthodontic mini- implants and insertion angle to the bone surface. Korean J Orthod 2006;36:178-187.
Koo BC, Sohn BW. An analysis of stress distribution in the case of unilateral molar expansion with precision lingual arch by finite element method. Korean J Orthod 1994;24:721-733.
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