个性化舌侧矫治不同加载方式内收上前牙的生物力学特征
发布时间：2018-07-21 09:19
【摘要】：目的 分析个性化舌侧矫治系统，在利用微种植体滑动法内收上前牙的过程中，不同加载方式对前牙生物力学特征的影响，为临床医师使用e-Brace个性化舌侧矫治，选用最佳的加载方式内收上前牙、关闭拔牙间隙，提供生物力学参考依据。 方法 选取一名牙列完整的健康成年女性，以其个别正常牙合作为建模素材，结合CBCT扫描技术及Mimics14.11、Geomagic Studio12、Pro/E5.0、SolidWorks2013和ANSYS Workbench13.0等软件，建立包含e-Brace个性化舌侧托槽、牙齿、牙周膜、牙槽骨、弓丝、微种植体以及颊侧透明树脂扣在内的三维有限元模型，并进行网格划分。连接尖牙托槽牵引钩与腭侧微种植体，，或颊侧扣与颊侧微种植体，以确定矫治力方向。在单纯腭侧加载或颊腭侧同时加载2N牵引力的不同加力方式下，牵引钩长度分别为2mm、2.2mm、2.4mm时，分析前牙位移和牙周膜表面第一主应力的变化。 结果 1三维有限元模型的建立 采用本研究方法建立的三维有限元模型,包含e-Brace个性化舌侧托槽、牙齿、牙周膜、牙槽骨、弓丝、微种植体以及颊侧透明树脂扣。每个模型具有40个实体,区别仅为牵引钩长度不同的尖牙托槽，完全可以满足课题后续研究的需要。 2不同加载方式对前牙牙列位移的影响 2.1不同加载方式对前牙水平方向位移的影响： 不同加载方式中，中切牙和侧切牙位移分布基本不变，内翻趋势渐弱，整体趋于稳定；与单纯腭侧加力不同的是，在颊侧加力影响下，尖牙由近中部分渐弱的内翻趋势转变为远中部分渐强的内翻趋势。 牵引钩为2.4mm，在单纯腭侧加载时，前牙出现最小位移；而在颊腭侧同时加载时，前牙出现最大位移。 2.2不同加载方式对前牙矢状方向位移的影响： 不同加载方式中，中切牙整体较稳定，无明显翻转现象；与单纯腭侧加力不同的是，在颊侧加力影响下，侧切牙整体由明显内倾趋势变得较为稳定，尖牙牙尖处内收舌倾趋势明显。 牵引钩为2.4mm，单纯腭侧加载，前牙出现最小位移；而牵引钩为2.0mm，颊腭侧同时加载，前牙出现最大位移。 2.3不同加载方式对前牙垂直方向位移的影响: 不同加载方式中，中切牙表现为明显伸长下垂趋势，但是侧切牙及尖牙舌隆突偏远中部分表现为压低趋势；随着牵引钩长度的增加，单纯腭侧加力时，前牙最终表现为伸长趋势渐弱，但在颊侧加力的影响下，中切牙与尖牙则表现为伸长趋势渐强。 牵引钩为2.2mm，单纯腭侧加载，前牙出现最小位移；而牵引钩为2.0mm，颊腭侧同时加载，前牙出现最大位移。 3不同加载方式对前牙牙周膜表面第一主应力的影响： 不同加载方式作用下，中切牙和侧切牙牙周膜颈部腭侧、尖牙牙周膜颈部腭侧与远中部分牙周膜表面第一主应力为负值，牙周膜处于压缩状态；中切牙牙周膜颈部唇侧及根尖腭侧、侧切牙周膜颈部唇侧小部分、尖牙牙周膜颈部唇侧小部分表面第一主应力为正值，牙周膜处于拉伸状态。 随着牵引钩长度的增加，在单纯腭侧加力时，前牙牙周膜表面受拉或压应力减小，而颊腭侧同时加力时，前牙牙周膜表面拉或压应力先明显减小后轻微增大。 结论 1本研究建立的三维有限元模型几何相似性与力学相似性强，满足了实验模拟加载的需要，可有效地进行三维有限元法的力学分析求解。 2不同加载方式中，中切牙、侧切牙在水平方向及矢状方向上均只出现轻微的内倾趋势，而在垂直方向上出现明显的伸长下垂趋势；而尖牙在不同方向上均表现明显的位移趋势。 3不同加载方式中，前牙牙周膜表面第一主应力集中体现的部位主要在牙颈部。牵引钩为2.0mm、单纯腭侧加力的组合加载方式，前牙牙周膜所受应力最大；而牵引钩为2.2mm、颊腭侧同时加力的组合加载方式，前牙牙周膜所受应力最小。
[Abstract]:objective
The effect of different loading methods on the biomechanical characteristics of anterior teeth in the process of using the micro implant sliding method to receive the anterior teeth was analyzed by the individualized lingual treatment system, which provided a biomechanical reference for the clinicians to use the e-Brace individualized tongue correction, the best way of loading the anterior teeth, and the clearance of the tooth extraction.
Method
A healthy adult female with a complete dentition was selected as the modeling material for their individual normal occlusion, combined with CBCT scanning technology and Mimics14.11, Geomagic Studio12, Pro/E5.0, SolidWorks2013 and ANSYS Workbench13.0 software to establish individual tongue side brackets containing e-Brace, teeth, periodontal membrane, alveolar bone, arch wire, micro implant and cheek. A three-dimensional finite element model of the transparent resin buckle is used to mesh the mesh, connecting the canine brackets and palatal micro implants, or buccal and buccal micro implants to determine the direction of the correction force. The length of the traction hook is 2mm, 2.2mm, and 2.4mm, respectively, under the simple palatine loading or the buccal and palatal side loading of the 2N traction. The changes of anterior tooth displacement and the first principal stress on the surface of periodontal ligament were analyzed.
Result
The establishment of 1 three-dimensional finite element model
The three-dimensional finite element model established by this method includes e-Brace individualized tongue side brackets, teeth, periodontal membranes, alveolar bone, pantograph, micro implant, and buccal transparent resin buckle. Each model has 40 entities, and the difference is only a canine bracket with different length of the traction hook, which can fully meet the needs of the follow-up research.
The effect of 2 different loading methods on the displacement of anterior teeth
2.1 effect of different loading methods on horizontal displacement of anterior teeth:
In the different loading methods, the displacement distribution of the incisor and the lateral incisor is basically the same, the trend of the inner varus is weaker and the whole tends to be stable.
The traction hook was 2.4mm. When the palatal side was loaded, the anterior teeth had the smallest displacement. While the buccal palatal side was loaded at the same time, the maximum displacement of the front teeth appeared.
2.2 effect of different loading modes on sagittal displacement of anterior teeth:
In the different loading methods, the central incisor was more stable and no obvious reversal. Unlike the simple palatine force, the lateral incisor became more stable under the influence of the cheek side force, and the tendency of the apex of the cusp was obvious.
The traction hook was 2.4mm, the palatal loading was the only way, the anterior teeth had the smallest displacement, while the traction hook was 2.0mm, the buccal palatal side was loaded at the same time, and the anterior teeth had the largest displacement.
2.3 effect of different loading methods on vertical displacement of anterior teeth:
In the different loading methods, the middle incisor showed a trend of obvious elongation and drooping, but the lateral incisor and the canine protuberance in the remote part showed a trend of depression. With the increase of the length of the traction hook, the anterior teeth finally showed the trend of elongation, but the middle incisor and the canine were elongated with the influence of the buccal side force. The trend is getting stronger.
The traction hook was 2.2mm, the palatal loading was the only way, the anterior teeth had the smallest displacement, while the traction hook was 2.0mm, the buccal palatal side was loaded at the same time, and the anterior teeth had the largest displacement.
3 the effect of different loading methods on the first principal stress on the periodontal ligament of anterior teeth.
Under the action of different loading methods, the middle incisor and the lateral incisor of the periodontal membrane were in the neck and the palate, the first principal stress was negative and the periodontal membrane was in the compression state, the middle incisor periodontal membrane was in the neck lip and the apical palate side, the small part of the periapical periapical neck of the lateral incisor and the small part of the lip of the canine periodontal membrane. The first principal stress is positive and the periodontal ligament is stretched.
With the increase of the length of the traction hook, the tension or compressive stress on the surface of the anterior periodontal membrane decreased while the anterior lateral force of the palate was reduced, while the tension or compressive stress on the surface of the anterior periodontal membrane decreased slightly and then slightly increased when the buccal and palatal side was simultaneously added.
conclusion
1 the geometric similarity of the three-dimensional finite element model established by the study is strong and the mechanical similarity is strong, which satisfies the needs of the experimental simulation loading, and can be effectively solved by the mechanical analysis of the three-dimensional finite element method.
2 of the different loading methods, the middle incisors and lateral incisors were only slightly introverted in the horizontal and sagittal direction, but the vertical direction was obvious in the vertical direction, while the incisors showed significant displacement in different directions.
3 in different loading ways, the first main stress concentration of the front periodontal ligament is mainly in the tooth neck. The traction hook is 2.0mm, the combined loading mode of the simple palatal side force is the most stress, while the traction hook is 2.2mm, the buccal and palate side is combined with the loading method, the stress of the anterior periodontal membrane is the least.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R783.5
本文编号：2135061
[Abstract]:objective
The effect of different loading methods on the biomechanical characteristics of anterior teeth in the process of using the micro implant sliding method to receive the anterior teeth was analyzed by the individualized lingual treatment system, which provided a biomechanical reference for the clinicians to use the e-Brace individualized tongue correction, the best way of loading the anterior teeth, and the clearance of the tooth extraction.
Method
A healthy adult female with a complete dentition was selected as the modeling material for their individual normal occlusion, combined with CBCT scanning technology and Mimics14.11, Geomagic Studio12, Pro/E5.0, SolidWorks2013 and ANSYS Workbench13.0 software to establish individual tongue side brackets containing e-Brace, teeth, periodontal membrane, alveolar bone, arch wire, micro implant and cheek. A three-dimensional finite element model of the transparent resin buckle is used to mesh the mesh, connecting the canine brackets and palatal micro implants, or buccal and buccal micro implants to determine the direction of the correction force. The length of the traction hook is 2mm, 2.2mm, and 2.4mm, respectively, under the simple palatine loading or the buccal and palatal side loading of the 2N traction. The changes of anterior tooth displacement and the first principal stress on the surface of periodontal ligament were analyzed.
Result
The establishment of 1 three-dimensional finite element model
The three-dimensional finite element model established by this method includes e-Brace individualized tongue side brackets, teeth, periodontal membranes, alveolar bone, pantograph, micro implant, and buccal transparent resin buckle. Each model has 40 entities, and the difference is only a canine bracket with different length of the traction hook, which can fully meet the needs of the follow-up research.
The effect of 2 different loading methods on the displacement of anterior teeth
2.1 effect of different loading methods on horizontal displacement of anterior teeth:
In the different loading methods, the displacement distribution of the incisor and the lateral incisor is basically the same, the trend of the inner varus is weaker and the whole tends to be stable.
The traction hook was 2.4mm. When the palatal side was loaded, the anterior teeth had the smallest displacement. While the buccal palatal side was loaded at the same time, the maximum displacement of the front teeth appeared.
2.2 effect of different loading modes on sagittal displacement of anterior teeth:
In the different loading methods, the central incisor was more stable and no obvious reversal. Unlike the simple palatine force, the lateral incisor became more stable under the influence of the cheek side force, and the tendency of the apex of the cusp was obvious.
The traction hook was 2.4mm, the palatal loading was the only way, the anterior teeth had the smallest displacement, while the traction hook was 2.0mm, the buccal palatal side was loaded at the same time, and the anterior teeth had the largest displacement.
2.3 effect of different loading methods on vertical displacement of anterior teeth:
In the different loading methods, the middle incisor showed a trend of obvious elongation and drooping, but the lateral incisor and the canine protuberance in the remote part showed a trend of depression. With the increase of the length of the traction hook, the anterior teeth finally showed the trend of elongation, but the middle incisor and the canine were elongated with the influence of the buccal side force. The trend is getting stronger.
The traction hook was 2.2mm, the palatal loading was the only way, the anterior teeth had the smallest displacement, while the traction hook was 2.0mm, the buccal palatal side was loaded at the same time, and the anterior teeth had the largest displacement.
3 the effect of different loading methods on the first principal stress on the periodontal ligament of anterior teeth.
Under the action of different loading methods, the middle incisor and the lateral incisor of the periodontal membrane were in the neck and the palate, the first principal stress was negative and the periodontal membrane was in the compression state, the middle incisor periodontal membrane was in the neck lip and the apical palate side, the small part of the periapical periapical neck of the lateral incisor and the small part of the lip of the canine periodontal membrane. The first principal stress is positive and the periodontal ligament is stretched.
With the increase of the length of the traction hook, the tension or compressive stress on the surface of the anterior periodontal membrane decreased while the anterior lateral force of the palate was reduced, while the tension or compressive stress on the surface of the anterior periodontal membrane decreased slightly and then slightly increased when the buccal and palatal side was simultaneously added.
conclusion
1 the geometric similarity of the three-dimensional finite element model established by the study is strong and the mechanical similarity is strong, which satisfies the needs of the experimental simulation loading, and can be effectively solved by the mechanical analysis of the three-dimensional finite element method.
2 of the different loading methods, the middle incisors and lateral incisors were only slightly introverted in the horizontal and sagittal direction, but the vertical direction was obvious in the vertical direction, while the incisors showed significant displacement in different directions.
3 in different loading ways, the first main stress concentration of the front periodontal ligament is mainly in the tooth neck. The traction hook is 2.0mm, the combined loading mode of the simple palatal side force is the most stress, while the traction hook is 2.2mm, the buccal and palate side is combined with the loading method, the stress of the anterior periodontal membrane is the least.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R783.5
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