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
Based on Newton ' s second law,the bend-torsion-shaft coupling nonlinear dynamic model and equations of power split gear transmission system are established.According to the principle of tooth profile modification...Based on Newton ' s second law,the bend-torsion-shaft coupling nonlinear dynamic model and equations of power split gear transmission system are established.According to the principle of tooth profile modification,the tooth profile modification is considered as time-varying gear backlash function acting along the line of action.Then the dynamic functions are solved by using Runge-Kutta numerical method.After analyzing the effect of tooth profile modification quantity( TPMQ) and relative tooth profile modification length( TPML) to the nonlinear dynamic characteristics of power split gear transmission,the following conclusions are drawn:1 The TPMQ of a certain stage transmission affects the vibration of its own stage more significantly than the other stage,and the coupling effect between two stages can be ignored usually in the modification design;2 If the first stage TPMLs are less than 0.3,the influence of the first stage TPMLs to the first stage transmission vibration is much more greatly than the influence of the second stage TPMLs to the first stage transmission vibration,or else both the first and second stage TPMLs affect the first stage transmission vibration largely.The same is true for the second stage TPMLs,and the cutoff value is 0.2;3 The TPMQ affects the vibration of power split gear transmission system more principally than the TPML,and should be top-priority in the modification design.展开更多
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。
基金Sponsored by the National Natural Science Foundation of China(Grant No.2009AA04Z404)
文摘Based on Newton ' s second law,the bend-torsion-shaft coupling nonlinear dynamic model and equations of power split gear transmission system are established.According to the principle of tooth profile modification,the tooth profile modification is considered as time-varying gear backlash function acting along the line of action.Then the dynamic functions are solved by using Runge-Kutta numerical method.After analyzing the effect of tooth profile modification quantity( TPMQ) and relative tooth profile modification length( TPML) to the nonlinear dynamic characteristics of power split gear transmission,the following conclusions are drawn:1 The TPMQ of a certain stage transmission affects the vibration of its own stage more significantly than the other stage,and the coupling effect between two stages can be ignored usually in the modification design;2 If the first stage TPMLs are less than 0.3,the influence of the first stage TPMLs to the first stage transmission vibration is much more greatly than the influence of the second stage TPMLs to the first stage transmission vibration,or else both the first and second stage TPMLs affect the first stage transmission vibration largely.The same is true for the second stage TPMLs,and the cutoff value is 0.2;3 The TPMQ affects the vibration of power split gear transmission system more principally than the TPML,and should be top-priority in the modification design.
