针对单绕组宽转子齿结构无轴承开关磁阻电机(bearingless switched reluctance motor with wider rotor teeth,BSRMWR)的齿极绕组故障情况,基于该电机的本体结构与工作原理,提出一种兼顾转矩性能与悬浮力稳定性的补偿方法。建立适用于...针对单绕组宽转子齿结构无轴承开关磁阻电机(bearingless switched reluctance motor with wider rotor teeth,BSRMWR)的齿极绕组故障情况,基于该电机的本体结构与工作原理,提出一种兼顾转矩性能与悬浮力稳定性的补偿方法。建立适用于该悬浮力补偿方式的电机新型数学模型;为了在应用悬浮力补偿方式时的稳定悬浮,将一种新型悬浮力分配函数(force sharing function,FSF)引入电流斩波控制(current chopping control,CCC)策略。通过仿真软件及硬件实验平台,验证CCC&FSF控制方法对稳定悬浮力的有效性,以及基于CCC&FSF策略下的悬浮力补偿方法在绕组故障时的有效性。展开更多
Objective: The aim of study was to evaluate the nature of mesiodistal angulation of the posterior teeth in patients with maxillary high canine, and to identify possible associations of crowding with mesial axial angul...Objective: The aim of study was to evaluate the nature of mesiodistal angulation of the posterior teeth in patients with maxillary high canine, and to identify possible associations of crowding with mesial axial angulation of the maxillary posterior teeth. Methods: The present study included seven Japanese male and 23 Japanese female patients. Study models were analyzed to evaluate the effectiveness of orthodontic treatment. A protractor was used to measure crown angulations, which were measured with reference to the posterior angle between the functional occlusal plane (FOP) and the long axis of the clinical crown of the lateral teeth and first molars. A sliding digital caliper was used to measure dental arch widths. Changes in the rotation of the maxillary molars were analyzed using “occlu-sograms”, which were printed from photographs of the occlusal aspect of the study model. Results: The maxillary teeth interacted with one another in the alveolar bone, resulting in progressive mesial tipping of the posterior teeth before orthodontic treatment. After orthodontic treatment, the angle relative to the FOP exhibited a significant increase, indicating that the maxillary teeth underwent distally directed uprighting (P P Conclusions: Based on the results, both uprighting of mesially tipped lateral teeth and expansion of narrow dental arches could prove to be keys to success in space regaining or correction of high canines and mild crowding.展开更多
目的:探究iRoot BP Plus在年轻恒牙活髓切断术中的应用及对患牙功能及美观度的影响。方法:选择笔者医院2019年1月-2022年5月收治的因外伤导致年轻恒牙冠折露髓的98例患者作为研究对象进行前瞻性研究,按照首诊就诊顺序随机均分为观察组...目的:探究iRoot BP Plus在年轻恒牙活髓切断术中的应用及对患牙功能及美观度的影响。方法:选择笔者医院2019年1月-2022年5月收治的因外伤导致年轻恒牙冠折露髓的98例患者作为研究对象进行前瞻性研究,按照首诊就诊顺序随机均分为观察组和对照组。对照组(49例)应用氢氧化钙行活髓切断术,观察组(49例)应用iRoot BP Plus行活髓切断术,比较两组手术情况、患牙修复效果、牙体功能、牙齿美观度及不良反应。结果:观察组患者疼痛持续时间、肿胀持续时间及手术时间均短于对照组(P<0.05);观察组修复有效率为95.92%,显著高于对照组的81.63%(P<0.05)。牙体功能方面,观察组患者的舒适功能评分显著高于对照组(P<0.05),两组固定功能、咀嚼功能、语言功能评分比较差异无统计学意义(P>0.05)。美观度方面,观察组患者的边缘适宜、染色情况均优于对照组(P<0.05),两组修复体完整情况比较差异无统计学意义(P>0.05)。观察组不良反应发生率4.08%,显著低于对照组的8.16%(P<0.05)。结论:iRoot BP Plus在年轻恒牙活髓切断术中的应用效果显著,患牙填充满意、恢复更快,能够更好地改善患牙功能及美观度,并且不良反应少,可以作为优选方案。展开更多
文摘Objective: The aim of study was to evaluate the nature of mesiodistal angulation of the posterior teeth in patients with maxillary high canine, and to identify possible associations of crowding with mesial axial angulation of the maxillary posterior teeth. Methods: The present study included seven Japanese male and 23 Japanese female patients. Study models were analyzed to evaluate the effectiveness of orthodontic treatment. A protractor was used to measure crown angulations, which were measured with reference to the posterior angle between the functional occlusal plane (FOP) and the long axis of the clinical crown of the lateral teeth and first molars. A sliding digital caliper was used to measure dental arch widths. Changes in the rotation of the maxillary molars were analyzed using “occlu-sograms”, which were printed from photographs of the occlusal aspect of the study model. Results: The maxillary teeth interacted with one another in the alveolar bone, resulting in progressive mesial tipping of the posterior teeth before orthodontic treatment. After orthodontic treatment, the angle relative to the FOP exhibited a significant increase, indicating that the maxillary teeth underwent distally directed uprighting (P P Conclusions: Based on the results, both uprighting of mesially tipped lateral teeth and expansion of narrow dental arches could prove to be keys to success in space regaining or correction of high canines and mild crowding.
文摘目的:探究iRoot BP Plus在年轻恒牙活髓切断术中的应用及对患牙功能及美观度的影响。方法:选择笔者医院2019年1月-2022年5月收治的因外伤导致年轻恒牙冠折露髓的98例患者作为研究对象进行前瞻性研究,按照首诊就诊顺序随机均分为观察组和对照组。对照组(49例)应用氢氧化钙行活髓切断术,观察组(49例)应用iRoot BP Plus行活髓切断术,比较两组手术情况、患牙修复效果、牙体功能、牙齿美观度及不良反应。结果:观察组患者疼痛持续时间、肿胀持续时间及手术时间均短于对照组(P<0.05);观察组修复有效率为95.92%,显著高于对照组的81.63%(P<0.05)。牙体功能方面,观察组患者的舒适功能评分显著高于对照组(P<0.05),两组固定功能、咀嚼功能、语言功能评分比较差异无统计学意义(P>0.05)。美观度方面,观察组患者的边缘适宜、染色情况均优于对照组(P<0.05),两组修复体完整情况比较差异无统计学意义(P>0.05)。观察组不良反应发生率4.08%,显著低于对照组的8.16%(P<0.05)。结论:iRoot BP Plus在年轻恒牙活髓切断术中的应用效果显著,患牙填充满意、恢复更快,能够更好地改善患牙功能及美观度,并且不良反应少,可以作为优选方案。
