单次与重复多次根管疏通填充治疗对牙体牙髓病患者的临床对比研究

分析牙体牙髓病行单次与重复多次根管疏通后根管充填治疗的效果。方法 我院2020年12月至2022年12月诊治牙体牙髓病患者70例为对象,随机单盲法分组,每组35例,均根管多次疏通后根管充填治疗,对照组重复多次,观察组为单次。结果 观察组治疗有效率和对照组比较更高(P<0.05);观察组视觉疼痛分数、出血指数、牙龈指数、咬合力、咀嚼效率和对照组比较更优(P<0.05);观察组并发症和对照组比较更少(P<0.05);治疗后观察组炎性因子更低于对照组(P<0.05)。结论 根管疏通填充是治疗牙体牙髓病的主要方法,重复多次和单次治疗相比,单次治疗有效性更为明显,而且安全度更高,减轻患者的疼痛感受,咀嚼功能等恢复效果更好。

常系数线性齐次递归关系的求解

文章提出了常系数线性齐次递归关系的求解方法,并通过具体算例详细说明,在特征方程的解为重复根时的求解方法.

单次与重复多次根管疏通填充对牙体牙髓病患者疼痛程度、咀嚼功能及炎性因子水平的影响

目的:探讨单次与重复多次根管疏通填充对牙体牙髓病患者疼痛程度、咀嚼功能及炎性因子水平的影响。方法:选取我院收治的119例牙体牙髓病患者,按照乱数表法将患者分为A组(n=59,重复多次根管疏通填充治疗)、B组(n=60,单次根管疏通填充治疗)。比较两组患者临床疼痛程度、总有效率、咀嚼功能及炎性因子水平,记录两组并发症发生情况。结果:B组治疗2周后的临床总有效率为93.33%(56/60),高于A组的74.58%(44/59)(P<0.05)。治疗2周后两组患者咬合力、咀嚼效率升高,且B组高于A组(P<0.05);两组患者治疗2周后牙龈指数、视觉疼痛模拟评分法(VAS)评分均下降,且B组低于A组(P<0.05)。两组患者治疗2周后血清白介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、C反应蛋白(CRP)水平均降低,且B组低于A组(P<0.05)。B组术后并发症发生率低于A组(P<0.05)。结论:采用单次根管疏通填充治疗可有效改善牙体牙髓病患者临床症状及炎性因子水平,还可降低术后并发症发生率,疗效确切。

Hot Issues in and Directions for Plant Root Research in Ecological Remediation

The mining activities destroy the natural vegetation and the land, pollute the environment in many aspects, and more and more attention has been paid to the ecological restoration in the mining area. Phytoremediation is the greenest tech- nical means of ecological restoration and reconstruction in the mining area. The root system is a direct organ that absorbs nutrients and water dudng phytoremediation, which is of great significance to ecological restoration. In order to explore the hot issues of plant root system in phytoremediation, the current situation of root system under the stress of heavy metal pollution and drought stress and geotechnical stress was reviewed, and the improvement effect of root exudates on rhizosphere environment was briefly introduced. The future direction of root system in ecological restoration and environmental protection was proposed on the basis of the existing research and existing problems.