Effect of Different Mini Implant Assisted Rapid Palatal Expansion (MARPE) Designs on Maxillary Protraction in Skeletal Class III malocclusion: An FEM Study.
Ashik Suresh, Ajith Vallikat Velath, K Sarika, Rahul Damodaran Prabha, N K Sapna Varma
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引用次数: 0
Abstract
Background: Four different designs of mini-implant-assisted rapid palatal expansion (MARPE) and protraction in nasomaxillary complex and mid-palatal sutures in late adolescent skeletal Class III malocclusion were compared using a three-dimensional finite element analysis.
Methods: A finite element model of skull and related sutures was constructed using the computed tomography scan of a 16-year-old female patient with skeletal Class III and ANB of -2°. Four appliance designs: Type I: MARPE with palatal force, Type II: MARPE with buccal force, Type III: Hybrid hyrax with palatal force, and Type IV: Hybrid hyrax with buccal force. Protraction vectors were and analyzed using Ansys software (ANSYS 2021 R2). The displacement pattern of the nasomaxillary structures and the stress distribution in the sutures were examined in all four appliance designs.
Results: All the appliance designs resulted in a forward movement of the maxilla, while Type I and III, which used palatal protraction force, caused the greatest forward displacement. In Type I, II, and III, along with forward movement, a clockwise rotation of maxilla was observed, while in Type IV, an anticlockwise rotation of maxilla was observed. Type I, II, and III resulted in higher stress distribution around the superior structures, while Type IV resulted in less stress distribution around the superior structures of maxilla.
Conclusion: The forward displacement was enhanced when palatal plates were used to protract the maxilla. The effective appliance design for skeletal class III with open bite case was Type I, II, and III and Type IV for deep bite cases.
不同的迷你种植体辅助快速腭部扩张（MARPE）设计对骨骼性 III 类错牙合畸形上颌前突的影响：有限元研究。
背景：通过三维有限元分析，比较了四种不同设计的微型种植体辅助快速腭扩展（MARPE）以及鼻颌复合体和腭中缝的牵引对青少年晚期骨骼Ⅲ类错颌畸形的影响：方法： 使用一名 16 岁女性患者的计算机断层扫描图像构建了头骨和相关缝合的有限元模型，该患者骨骼Ⅲ级，ANB 为-2°。四种矫治器设计：类型 I：I型：带腭侧力的MARPE；II型：带颊侧力的MARPE；III型：带腭侧力的混合hyrax；IV型：带颊侧力的混合hyrax。使用 Ansys 软件（ANSYS 2021 R2）对牵引矢量进行了分析。对所有四种矫治器设计的鼻颌结构位移模式和缝线应力分布进行了研究：结果：所有矫治器设计都导致上颌骨前移，而使用腭侧牵引力的 I 型和 III 型导致的前移最大。在 I 型、II 型和 III 型矫治器中，在向前移动的同时，还观察到上颌骨顺时针旋转，而在 IV 型矫治器中，观察到上颌骨逆时针旋转。Ⅰ、Ⅱ和Ⅲ型上颌骨上部结构周围的应力分布较高，而Ⅳ型上颌骨上部结构周围的应力分布较低：结论：当使用腭板来牵引上颌骨时，前移率会增加。对于骨骼等级 III 伴有开放性咬合的病例，有效的矫治器设计是 I、II 和 III 型，而对于深咬合病例，有效的矫治器设计是 IV 型。
期刊介绍：
The journal Contemporary Clinical Dentistry (CCD) (Print ISSN: 0976-237X, E-ISSN:0976- 2361) is peer-reviewed journal published on behalf of Maharishi Markandeshwar University and issues are published quarterly in the last week of March, June, September and December. The Journal publishes Original research papers, clinical studies, case series strictly of clinical interest. Manuscripts are invited from all specialties of Dentistry i.e. Conservative dentistry and Endodontics, Dentofacial orthopedics and Orthodontics, Oral medicine and Radiology, Oral pathology, Oral surgery, Orodental diseases, Pediatric Dentistry, Periodontics, Clinical aspects of Public Health dentistry and Prosthodontics. Review articles are not accepted. Review, if published, will only be by invitation from eminent scholars and academicians of National and International repute in the field of Medical/Dental education.
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