Correlative Factors Research of Tibial Shaft Fracture with Ipsilateral Posterior Malleolar Crack Fractures

Background:Missed diagnosis rate of spiral tibia shaft fracture with posterior malleolus crack fracture(PMCF)is high in the clinical.However,the mechanism and related factors of fracture are still unclear.Moreover,PMCF has been observed in other types of tibial shaft fractures.Objective:To explore the correlative factors of tibial shaft fracture with ipsilateral PMCF,decrease the rate of clinical missed diagnosis,strengthen the effective fixation of PMCF,and reduce the incidence of traumatic arthritis.Methods:From September 2014 to May 2019,we collected 137 tibiofibular fracture.Only 68 cases involved in ankle joint CT examination and were retrospectively analyzed.The patients were divided into posterior malleolus group(30 cases)and non-posterior malleolus group(38 cases)according to whether come up PMCF or not.The posterior malleolus group contained 24 males and 6 females,27-77(47.57±11.79)years old,the non-posterior malleolus group contained 23 males and 15 females,18-85(48.71±13.84)years old.The gender,age,location,fibula fracture and tibial shaft fracture classification were observed for univariate and multivariate analysis.Results:The probability of PMCF was higher with right tibial shaft fracture(OR=3.6995%CI:1.13-12.08 P<0.05);the probability of PMCF following distal fibular fracture was higher than that without fibular fracture(OR=11.3695%CI:1.72-75.05 P<0.05);the probability of PMCF with type A tibial shaft fracture was higher than type C(OR=4.8295%CI:1.19-19.58 P<0.05).Conclusion:Right type A tibial shaft fracture accompanied by distal fibular fracture are very important factors related to PMCF,which needs highly attention to avoid clinical missed diagnosis.

Prevalence and Distribution of Cracked Posterior Teeth among Adult Patients

Background: There are challenges in detection and prevalence of cracked teeth, especially in asymptomatic cases. This underestimates the actual prevalence and possibility of preventive restorative treatment. Objectives: To determine the prevalence and distribution of cracked posterior teeth among adult patients attending the dental clinic of OAUTHC, Ile-Ife, Osun State, Nigeria. Materials and Methods: A cross sectional study where consecutive patients aged 18 years and above were examined for the presence of cracked posterior teeth over a period of one year (May 2016-April 2017). The teeth were initially examined with the naked eye. Thereafter, transillumination, methylene blue dye and magnifying lens were used to aid detection of more cracks. Data was analyzed with the IBM Statistical Package for Social Sciences (SPSS) for Windows (version 21.0). Level of significance was set at p ≤ 0.05. Results: Out of the 64,370 posterior teeth examined for cracks in 3345 patients, 264 were diagnosed as cracked in 152 patients, giving a patient prevalence of 4.5% and tooth prevalence of 0.4%. Amongst the 152 patients, the prevalence was 9.1%. There was a slightly higher male preponderance while cracked tooth was observed to increase with age (p = 0.007). The skilled (56.6%) and those that attained tertiary education (77.6%, p = 0.023) had more cracked teeth. Mandibular first molar (19.7%) was the most frequently cracked tooth type. The cracks were usually centrally placed (91.7%) and run in a mesiodistal direction (61%). Transillumination (44.7%) detected more cracked teeth. Conclusion: Prevalence of cracked tooth was observed to be low with a slightly higher proportion in male and the figure increases with age. Mandibular first molar was the most frequently cracked tooth while transillumination was the most useful diagnostic tool. Most cracks ran in the mesiodistal direction and fracture lines were usually centrally placed.

基于拉剪破坏的边坡后缘张裂缝深度探讨

土体的张拉效应会引起坡顶后缘一定区域内出现张裂缝,而裂缝的位置和深度决定着边坡是否安全。基于土体的变形参数、单轴抗拉应力和朗肯主动土压力理论得到边坡裂缝深度的上限,通过已有文献共同界定裂缝深度的位置、取值范围,通过算例比较,进一步解释带裂缝边坡的稳定性。边坡后缘张裂缝深度与张拉效果的发挥程度有关,张拉特性不能完全发挥时,取坡高一半作为裂缝深度上限是取得最保守安全系数的简便方法。研究方法可为边坡后缘裂缝深度取值、带裂缝边坡岩土体失稳力学机理研究提供借鉴。

后磨牙折裂及隐裂的临床治疗研究

目的探讨560颗不同类型折裂及隐裂的后磨牙的治疗措施和效果。方法对不同类型的患牙分别采取调牙合、垫底、充填、根管治疗、截根、牙半切除、修复等措施并进行临床疗效的随访评估。结果除去16颗因病损严重不宜保存治疗而拔除的患牙外,其余544颗患牙经过合理完善的相应处理,随访3~5年,其中疗效评估为优良者505颗,占比92.83%,仅有5颗因全冠脱落未及时粘固而致严重根尖及牙周病变予以拔除。结论对隐裂及折裂患牙进行合理的临床分类并采取相应有效处理措施能最大限度地保留患牙。

126例后牙牙冠隐裂的处理与疗效观察

目的 探讨牙隐裂的治疗及疗效。方法 对 15 8例共 16 2颗后牙隐裂牙 ,包括牙釉质隐裂和牙本质隐裂 ,所有病例均进行综合治疗 ,并分期复查 ,最长观察时间 2 .5a。结果 16 2颗隐裂牙的治疗成功与改善率为 90 .74% ,在失败病例中 ,急性牙髓炎 6颗 ( 3.7% ) ,牙槽脓肿 3颗 ( 1.85 % ) ,慢性根尖周炎 2颗 ( 1.2 4% ) ,牙折裂 4颗 ( 2 .4% )。结论 牙隐裂因多种因素所致 ,因此早期发现 ,综合治疗 ,定期复查是治疗的

临时树脂冠在后牙冠纵折及隐裂治疗中的辅助作用及治疗成功率分析

目的：探讨临时树脂冠在后牙冠纵折及隐裂治疗中的辅助作用及成功率。方法选取2011年6月～2012年6月我院收治的后牙冠纵折及隐裂患者96例（106颗患牙）作为研究对象，采用数字表法将其分为研究组（56颗）和对照组（50颗），各48例。对照组采用常规治疗方法，研究组采用临时树脂冠治疗方法，观察两组患者患牙治疗疗效。结果治疗后随访期间，研究组总体并发情况较对照组显著减少，差异有统计学意义（P＜0.05），且研究组成功率为92.86%，高于对照组的54.00%，差异有统计学意义（P＜0.05）。结论采用临时树脂冠治疗后牙冠纵折及隐裂并发情况少，治疗成功率明显提高，具有良好的应用前景。

后牙隐裂行全冠修复的临床疗效分析

目的探讨后牙隐裂行全冠修复的临床效果。方法选择医院2018年1—12月收治的后牙隐裂患者80例为对象,根据入院顺序将患者分成对照组(n=40)和观察组(n=40),对照组用金属烤瓷全冠修复,观察组用二氧化锆全冠修复。比较两组患者的患牙修复成功率和口腔并发症发生率。结果观察组的患牙修复成功率高于对照组,差异具有统计学意义(P<0.05)。观察组的口腔并发症发生率低于对照组,差异具有统计学意义(P<0.05)。结论全冠修复治疗后牙隐裂的效果明显,二氧化锆全冠修复的成功率比金属烤瓷高,且患者发生口腔相关并发症的几率小,可获得良好的预后。

上下折裂磨牙裂纹方向与患牙预后的关系

目的探讨在折裂牙治疗中,不同的裂纹方向与患牙预后是否存在相关性。方法对20例纵折牙完成牙周及根管治疗后全冠修复样本,根据裂纹方向将上下磨牙分成4组,对其远期疗效进行评估。结果对于上颌磨牙,近、远中裂较颊、舌向裂成功率高;对于下颌磨牙,颊、舌向裂较近、远中裂成功率高。结论上下折裂磨牙不同的裂纹方向影响患牙预后.

隐裂牙治疗的几点体会

目的:探讨牙隐裂的治疗及疗效。方法:对158例共162颗后牙隐裂牙,包括牙釉质隐裂和牙本质隐裂,所有病例均进行综合治疗,并分期复查,最长观察时间2.5 a。结果:162颗隐裂牙的治疗成功与改善率为90.74%,在失败病例中,急性牙髓炎6颗(3.7%),牙槽脓肿3颗(1.85%),慢性根尖周炎2颗(1.24%),牙折裂4颗(2.4%)。结论:牙隐裂因多种因素所致,因此早期发现,综合治疗,定期复查是治疗的3个关键。

机械零件裂纹扩展的灰色预测

本文应用灰色系统理论建立了旋转机械中的零件裂纹扩展的灰色动态预测模型，对预测结果作后验差检验，证明了该模型的可靠性。

96例后牙牙冠隐裂综合治疗及疗效的观察

目的 探讨牙隐裂的治疗和疗效。方法 对 75例病人共 96颗后牙隐裂牙进行综合治疗 ,并复查 ,最长观察时间 1年。结果 96颗隐裂牙的治疗成功与有效率为 91 6 6 % ,在失败病例中 ,急性牙髓炎 4颗(4 17% ) ,慢性根尖周炎 3颗 (3 13% ) ,牙折裂 1颗 (1 0 4% )。结论 牙隐裂因多种因素所致 ,因此早期发现 ,综合治疗 ,定期复查是治疗的 3个关键。

后牙纵裂经全冠修复后失败30例分析

目的：对全冠修复后牙纵裂患者失败的原因进行分析，总结后牙纵裂的更好治疗方法。方法：随机抽取在2009年12月到2012年12月期间在我院接受后牙纵裂全冠修复治疗的患者30例作为实验研究的对象，对患者的临床资料进行回顾性分析，找到后牙纵裂全冠修复后失败的原因，并总结出更加有效的后牙纵裂治疗方法。结果：参加本次实验研究30例患者修复失败的原因有治疗时机选择不当、适应症选择不当、裂缝未完全吻合、全冠颊侧边缘过长刺激牙周组织以及全冠与邻牙接触点恢复不好。结果：在对后牙纵裂患者实施全冠修复治疗的过程中，导致治疗失败的原因有很多，在治疗的过程中应该对这些原因有充分的认识，避免对患者治疗造成的影响，找到更好的后牙纵裂治疗方法。