Application Research of PETD Combined with MRI Nerve Root Water Imaging in the Minimally Invasive Treatment of LDH

Objective: This study aims to evaluate the safety and efficacy of PETD combined with nerve root water imaging of MRI for the treatment of lumbar disc herniation. Methods: A retrospective review was performed on 62 patients with lumbar disc herniation from March 2019 to March 2021. The study included an experimental group of 30 patients and a control group of 32 patients. The experimental group underwent PETD combined with nerve root water imaging of MRI, while the control group received traditional PETD treatment. The visual analogue scoring method (VAS score), and JOA lumbar spine function score before and after surgery were compared between the two groups, and efficacy was assessed and compared using the MacNab score. Results: The mean operation time was significantly reduced in the experimental group (56.43 ±10.40 minutes) compared to the control group (65.69 ±14.12 minutes). The VAS score was compared between the two groups with preoperative (p = 0.624), one month after surgery (p = 0.325), three months after surgery (p = 0.676), one year after surgery (p = 0.341);The JOA score was compared between the two groups with preoperative (p = 0.961), one month after the surgery (p = 0.266), three months after surgery (p = 0.185), one year after surgery (p = 0.870), they were no significant statistical difference;The efficacy evaluation of the last follow-up Macnab showed that all the 30 patients in the experimental group were excellent, 31 of 32 patients in the control group were excellent, 1 case was good;There was no statistical difference in the comparison between the two groups (p > 0.05). Conclusion: The study concludes that the combined approach of PETD with nerve root water imaging of MRI is a safe, effective, and more efficient alternative to conventional PETD for treating lumbar disc herniation.

C形根管充填治疗恒牙根尖周炎中采用热牙胶垂直加压法与iRoot SP冷侧压法的临床效果分析

目的分析C形根管充填治疗恒牙根尖周炎中采用热牙胶垂直加压法与iRoot SP冷侧压法的临床疗效。方法简单随机选择2019年6月—2021年12月烟台业达医院收治的60例恒牙根尖周炎患者作为研究对象,依据不同治疗方法分为两组,每组30例。两组患者均进行C形根管充填治疗,对照组采用热牙胶垂直加压法,观察组采用iRoot SP冷侧压法,比较两组患者临床疗效、填充效果、牙周指数。结果观察组治疗总有效率为100.00%(30/30),高于对照组的80.00%(24/30),差异有统计学意义(χ^(2)=4.630,P=0.031)。两组患者填充效果比较,差异无统计学意义(P>0.05)。治疗后10周,观察组出血指数、菌斑指数、牙龈指数、牙周袋深度均低于对照组,差异有统计学意义(P均<0.05)。结论在C形根管充填治疗恒牙根尖周炎患者中采用iRoot SP冷侧压法能提升临床疗效,改善牙周指数。

iRoot BP Plus应用于年轻恒牙血运重建术对患者牙根发育及龈沟液血管内皮生长因子、碱性成纤维细胞生长因子、白细胞介素-8、白细胞介素-1β水平的影响

目的:探讨iRoot BP Plus应用于年轻恒牙血运重建术对牙根发育及龈沟液血管内皮生长因子(VEGF)、碱性成纤维细胞生长因子(bFGF)、白细胞介素-8(IL-8)、白细胞介素-1β(IL-1β)水平的影响。方法:选取88例年轻恒牙血运重建术患儿作为研究对象,按照随机数字表法将其分为对照组(44例,44颗牙)和试验组(44例,44颗牙)。对照组使用无机三氧化物聚合物(MTA)作为填充材料,试验组选择iRoot BP Plus作为填充材料,两组术后均随访1年。比较两组随访1年后的疗效、牙根发育情况,术前、随访1年后的牙根长度、根管壁厚度、咬合功能、咀嚼功能、疼痛程度、牙周指数,术前、术后1周的龈沟液VEGF、bFGF、IL-8、IL-1β水平及随访期间的不良反应发生情况。结果:随访1年后,试验组总有效率及牙根发育Ⅰ型患儿占比分别为95.45%、47.73%,高于对照组的79.55%、25.00%(均P<0.05)。与术前比较,随访1年后,两组牙根长度、根管壁厚度增加,试验组高于对照组(均P<0.05);两组咬合功能、咀嚼功能、视觉模拟评分法(VAS)、牙周袋深度(PD)、牙龈指数(GI)、龈沟出血指数(SBI)、菌斑指数(PLI)评分降低,试验组低于对照组(均P<0.05)。与术前比较,术后1周,两组龈沟液VEGF、bFGF水平升高,试验组高于对照组(均P<0.05);两组龈沟液IL-8、IL-1β水平降低,试验组低于对照组(均P<0.05)。随访期间,试验组不良反应总发生率为4.55%,低于对照组的22.73%(P<0.05)。结论:与MTA比较,iRoot BP Plus应用于年轻恒牙血运重建术中可调节患儿龈沟液VEGF、bFGF、IL-8、IL-1β水平,减轻炎症,促进牙根生长发育,并可减轻患儿疼痛程度,改善咬合功能、咀嚼功能及牙周状况,进而有利于提高疗效,且具有较好的安全性。

Molecular regulatory mechanism of tooth root development

The root is crucial for the physiological function of the tooth, and a healthy root allows an artificial crown to function as required clinically. Tooth crown development has been studied intensively during the last few decades, but root development remains not well understood. Here we review the root development processes, including cell fate determination, induction of odontoblast and cementoblast differentiation, interaction of root epithelium and mesenchyme, and other molecular mechanisms. This review summarizes our current understanding of the signaling cascades and mechanisms involved in root development. It also sets the stage for de novo tooth regeneration.

Regular nicotine intake increased tooth movement velocity,osteoclastogenesis and orthodontically induced dental root resorptions in a rat model

Orthodontic forces have been reported to significantly increase nicotine-induced periodontal bone loss. At present, however, it is unknown, which further （side） effects can be expected during orthodontic treatment at a nicotine exposure corresponding to that of an average European smoker. 63 male Fischer344 rats were randomized in three consecutive experiments of 21 animals each （A/B/C） to 3 experimental groups （7 rats, 112/3）. （A） cone-beam-computed tomography （CBCT）; （B） histology/serology; （C） reverse- transcription quantitative real-time polymerase chain reaction （RT-qPCR）/cotinine serology--（1） control; （2） orthodontic tooth movement （OTM） of the first and second upper left molar （NiTi closed coil spring, 0.25 N）; （3） OTM with 1.89 mg-kg- 1 per day s.c. of L（- ）-nicotine. After 14 days of OTM, serum cotinine and IL-6 concentration as well as orthodontically induced inflammatory root resorption （OIIRR）, osteoclast activity （histology）, orthodontic tooth movement velocity （CBCT, within 14 and 28 days of OTM） and relative gene expression of known inflammatory and osteoclast markers were quantified in the dental-periodontal tissue （RT-qPCR）. Animals exposed to nicotine showed significantly heightened serum cotinine and IL-6 levels corresponding to those of regular European smokers. Both the extent of root resorption, osteoclast activity, orthodontic tooth movement and gene expression of inflammatory and osteoclast markers were significantly increased compared to controls with and without OTM under the influence of nicotine. We conclude that apart from increased periodontal bone loss, a progression of dental root resorption and accelerated orthodontic tooth movement are to be anticipated during orthodontic therapy, if nicotine consumption is present. Thus patients should be informed about these risks and the necessity of nicotine abstinence during treatment.

Effects of Prestressing of the Ring Gear in Interference Fit on Flexural Fatigue Strength of Tooth Root

When the gearbox body interference is connected to the ring gear, prestressing occurs in the ring gear, which has a significant impact on the strength and life of the gear. Research on the prestressing of the inner ring gear is in the preliminary stage, and the distribution rule of the prestressing and the influence of each parameter on the interference prestressing have not been derived. In this paper, based on the method of calculating the prestressing of the thick cylinder in interference fit, the ring gear is found to be equivalent to a thick cylinder, and the distribution rule of prestressing of the ring gear in the interference fit is inferred. Then, by modeling and analyzing the gearbox body and ring gear in the interference fit using ABAQUS, the distribution rule of prestressing the ring gear in the interference fit is obtained through a numerical simulation. Finally, the prestressing of the ring gear in the interference fit is measured using X-ray di raction, and the distribution rule of prestressing of the ring gear in the interference fit is obtained through analysis. Compared with the distribution rule of prestressing in theory, numerical simulation, and experiment, the theoretical distribution rule of prestressing is amended through a statistical method, and a more accurate formula of prestressing is obtained. Through the calculation of the stress and bending moment in the dangerous section of the ring gear through prestressing, the formula for checking the tooth root flexural fatigue strength in the interference fit prestressing is inferred. This research proposes a tooth root bending strength conditional formula for the inner ring gear of the interference fit, which serves as a guide for the design and production of the actual interference joint inner ring gear.

Fate of root shell after pontic/socket shield techniques,is it better to extract the whole tooth?

A series of changes occur in the remaining alveolar process after whole tooth extraction.The basic question is,why do the bony walls(especially the labial/buccal)get resorbed immediately after the tooth is removed?This could be because,with cementum of the concerned tooth and its periodontal ligament,the supporting bundle bone is dependent on the presence of the tooth.This loss can be compensated using numerous techniques,such as socket grafting using various biomaterials to preserve the alveolar bone and buccal grafting with guided tissue regeneration to increase the thickness of buccal bone or placement of implant immediately.However,none of these techniques prevent the modelling of the alveolar bone post-extraction.Few studies have demonstrated that preservation of the roots in the alveolar process maintains the bone volume and facilitates vertical bone growth.A histological study in animals and humans has shown that the retained root shell does not pose any interference in the osseointegration of the implant(if placed simultaneously).Although various names have been proposed to describe the concept of retaining full or part of the root to prevent the resorption of the ridge,socket-shield and pontic-shield are the two most commonly used terms worldwide.The extraction of the whole tooth might be the choice of therapy when socket-shield or pontic-shield is not possible due to anatomical variations,infections,or lack of clinical expertise.Irrespective of the size,when a whole root or a root fragment(is left in situ),it is the dentist’s ethical duty to advise/inform the patient and ensure repeated clinical and radiographic follow-up.The present study aimed to highlight the current status of these techniques,their benefits,and possible complications and address whether the paradigm of the teeth extraction methods should be altered.

External Root Resorption During Standardised Orthodontic Tooth Movement In Young And Adult Rats

目的 :比较研究幼鼠和成年鼠正畸牙齿移动过程中的牙根吸收。方法 :本研究包括两组大鼠 ,其中幼鼠 30只 (年龄约 6周 ) ,成年鼠 30只 (年龄约 912个月 )。大鼠上颌牙一侧用于实验侧 ,另一侧用于对照。实验侧的三颗磨牙用结扎丝颌粘接剂固为一个整体 ,在超弹性拉簧作用下 (力值为 0 .1牛顿 )向切牙侧移动。 1,2 ,4 ,8和 12周时给予大鼠过量麻醉剂 ,材料用于组织学研究。上颌第一磨牙的近中颊侧根为根吸收研究对象。压力侧和张力侧的牙根吸收程度在显微镜下进行长度测量。实验侧与对照侧 ,压力侧与张力侧 ,幼鼠与成年鼠之间的牙根吸收程度分别以实验时间为参照 ,在统计学手段下进行了组间和组内分析和比较 ,以探讨牙齿移动时间和年龄因素对于牙根吸收的影响。结果 :实验侧的牙根吸收在幼鼠与成年鼠之间在 1,2 ,4 ,8周时均没有统计学差异。而在第 12周时 ,成年鼠实验侧牙根吸收大于幼鼠 (P <0 .0 5 )。成年鼠实验组压力侧的牙根吸收明显大于对照组压力侧 ,而在幼鼠组没有发现这一差异。两组年龄幼鼠的实验组其压力侧和张力侧的牙根吸收均高度相关。结论 :相对于对照侧 ,正畸牙齿移动并没有在幼鼠的实验侧诱发更多的牙根吸收。在成年鼠 ,长期的正畸作用力倾向于诱发更多的牙根吸收。这些研究结果表明对于正?

Parathyroid Hormone: Is It Really the Cause for Increased Tooth Mobility after Orthognathic Surgery?

Introduction: Following orthognathic surgery, increased tooth mobility is observed clinically and is utilized for postsurgical orthodontic tooth movement. It was suggested that the increase may result from a surgery-associated alteration of parathyroid hormone (PTH) and calcium metabolism. Materials and Methods: 30 young adult patients were divided into a mandibular osteotomy group (Group A, n = 20) and an untreated control group (Group B, n = 10). Tooth mobility was evaluated using the Periotest device. Tooth mobility, serum PTH and calcium levels were determined repeatedly for both groups. Results: The tooth mobility was increased significantly in the Group A patients in the first 10 days post-surgery. All serum PTH and calcium mean levels were within normal ranges. No significant differences were found between the measurements of both groups. The serum calcium levels recorded at the 1st post-surgery day were slightly lower in the operated patients compared to the control group. Conclusion: It can be concluded that the increased facility of orthodontic tooth movement immediately post-surgery was confirmed by Periotest measurements, while no association was found with surgery-related altered levels of PTH and calcium. Since dietary effects can be ruled out, the increase of clinical tooth mobility may rather result from preoperative orthodontic forces and/or the post-surgical elimination of masticatory muscular influences.

Loss of Masticatory Function Affects Morphology of the Tooth Root in Rats

Masticatory hypofunction and soft food affect the tooth rows, occlusion, and jawbone. This study aimed to clarify the influence of tooth loss and a soft diet on morphology of the tooth root during the growth period. We divided 3-week-old Wistar rats into the following three groups: Hard diet group (rats raised on solid standard diet), Powder diet group (rats raised on powdered standard feed diet), and Extraction group (rats raised on powdered standard diet with maxillary molars extraction). Length, width, cross-sectional area, and volume of the root of the mandibular M1 and M2 were measured using micro-CT analysis. Non-decalcified thin-slice specimens of sagittal sections of the M1 were obtained at the age of 20 weeks, and the roots were observed. The root length of all roots in the Extraction group was significantly longer than that in the other groups. The root width and cross-sectional area at the apical side 1/4 of all roots in the Extraction group were significantly smaller than those in the other groups. The root volume of the M1 mesial root in the Extraction group was significantly smaller than that in the other groups. This study clarified that when masticatory stimulus in the immature teeth is reduced by the extraction of opposing teeth and a powder diet, the root length increases due to the promotion of cellular cementum addition at the apex, and the root width and cross-sectional area decrease due to the suppression of cellular cementum addition at the apical side 1/4 of the roots.

Different endodontic treatments induced root development of two nonvital immature teeth in the same patient:A case report

BACKGROUND Pulp revascularization is a novel way to treat immature teeth with periapical disease,and the technique has become increasingly well established in recent years.By puncturing the periapical tissue,bleeding is induced,and a blood clot is formed in the root canal.The blood clot acts as a natural bioscaffold onto which mesenchymal stem cells from periapical tissue can be seeded and restore pulp vascularity,thus promoting root development as well as apical closure.Although the effect of pulp revascularization is ideal,there are certain requirements for the apical condition of the teeth.The apical barrier technique and apexification are still indispensable for teeth that cannot achieve ideal blood clot formation.In addition,a meta-analysis of several clinical studies concluded that pulp revascu-larization has no significant advantages over other treatments.CASE SUMMARY A 10-year-old girl complained of pain in the right upper and lower posterior teeth for 2 d.Clinical and radiological examinations revealed that both the right maxillary and mandibular second premolars were immature with periapical radiolucency.The right maxillary second premolar was treated by pulp revascu-larization,while the right mandibular second premolar was treated by conven-tional apical barrier surgery after revascularization failed.The purpose of this report is to compare the different root maturation processes induced by the pulp revascularization and apical barrier techniques in the same patient in homonymous teeth from different jaws.Twelve months of follow-up showed that the apical foramen of both teeth presented a clear tendency to close;however,the tooth treated with pulp revascularization showed a significant increase in root length as well as root canal wall thickness.CONCLUSION For the treatment of nonvital immature teeth,pulp revascularization showed a superior therapeutic effect in comparison with the apical barrier technique.

根痛平颗粒联合普瑞巴林胶囊治疗经皮腰椎内镜术后神经根水肿反应的临床效果

目的 观察根痛平颗粒联合普瑞巴林胶囊治疗经皮腰椎内镜术后神经根水肿反应的临床效果。方法 选取2017年9月—2020年9月于沧州市中心医院脊柱外一科行经皮腰椎内镜手术术后出现单侧神经根水肿反应的患者40例。依据随机数字表法分为试验组(n=20)和对照组(n=20)。对照组给予普瑞巴林胶囊治疗,试验组在对照组基础上给予根痛平颗粒治疗,2组疗程均为2周。比较2组治疗效果、症状改善时间,治疗前及治疗后1、3、6周视觉模拟评分法(VAS)评分和Oswestry功能障碍指数(ODI)变化,以及不良反应。结果 试验组优良率为95.00%,高于对照组的65.00%(χ^(2)=3.906,P=0.048);试验组症状改善时间短于对照组(P<0.01);治疗后1、3、6周,2组VAS、ODI评分均低于治疗前,且试验组低于对照组(P<0.01);2组治疗期间均无药物相关不良反应发生。结论 根痛平颗粒联合普瑞巴林胶囊可有效治疗经皮腰椎内镜术后神经根水肿反应,且临床效果优于单纯普瑞巴林治疗,可有效改善相关症状及腰椎功能障碍,促进患者术后快速康复。

改良膜龈手术在牙龈退缩治疗中的应用

随着人们对美观需求的日益提升,治疗牙龈退缩已经成为牙周科临床常见的患者诉求。临床上主要通过手术的方式治疗牙龈退缩,常见的手术包括游离龈移植术、带蒂瓣技术和双层瓣技术,适应证选择恰当时,通常可以获得满意的效果,但上述术式仍存在一定的不足,如根面覆盖效果不理想等。近年来,学者们针对这些不足陆续提出了一些改良方案来治疗不同程度的牙龈退缩,如改良游离龈移植术,即包含龈乳头及游离龈的牙龈单元移植,可改善受体区血供,提高根面覆盖效果,其针对轻度退缩的部位可获得良好的根面覆盖,同时可增宽角化龈和加深前庭沟,但应用于上颌美学区时可能存在术后牙龈颜色、形态不协调,美学效果欠佳的问题。牙龈瓣采用半厚-全厚-半厚的技术进行制备的改良冠向复位瓣,用于多颗牙牙龈退缩时,以退缩最严重牙为中心的改良切口设计的冠向复位信封瓣技术,可提高根面覆盖效果。不离断龈乳头,使龈瓣形成隧道,以容纳移植物的隧道技术及各种改良的隧道技术,可以有效减少术区的组织损伤,并促进创面愈合。本文通过对各类术式的阐述和文献回顾,总结改良膜龈手术治疗牙龈退缩的临床应用及注意事项,并提出牙龈退缩的治疗方案建议,同时强调牙龈退缩的对因治疗,以达到稳定的根面覆盖效果。创伤小、疗效稳定的手术方式和治疗方法是今后膜龈手术的发展方向。

Nd:YAP激光消毒与盐酸米诺环素软膏辅助龈下刮治及根面平整术治疗中重度慢性牙周炎的效果分析

目的探讨Nd:YAP激光治疗机消毒与盐酸米诺环素软膏辅助龈下刮治及根面平整术对中重度慢性牙周炎的治疗效果。方法随机选取2020年1月—2023年6月常州市口腔医院收治的60例中重度慢性牙周炎患者为研究对象,根据治疗方法不同分为对照组和研究组,各30例。对照组进行龈下刮治及根面平整术治疗,研究组进行Nd:YAP激光消毒与盐酸米诺环素软膏配合龈下刮治与根面平整术治疗,比较两组治疗效果、不良反应发生情况、牙周指数评分及牙龈沟探诊深度。结果研究组治疗总有效率为96.67%(29/30),高于对照组的73.33%(22/30),差异有统计学意义(χ^(2)=4.706,P<0.05)。研究组不良反应发生率低于对照组,差异有统计学意义(P<0.05)。研究组牙龈指数评分、龈沟出血指数评分、牙龈沟探诊深度指数、菌斑指数评分均低于对照组,差异有统计学意义(P均<0.05)。结论中重度慢性牙周炎施以Nd:YAP激光消毒与盐酸米诺环素软膏配合龈下刮治与根面平整术治疗的效果更好,能够有效改善患者的牙周指标,并且降低不良反应发生率。

MTA根尖屏障术治疗根尖敞开恒牙的疗效评价

目的研究无机三氧化物聚合物(MTA)根尖屏障术用于根尖敞开恒牙中的价值。方法选择我院2021年1月-2023年2月纳入的根尖敞开恒牙患者80例,按随机列表法进行分组,各组40例,研究组采取MTA根尖屏障术,对照组选择热牙胶充填技术,比较各组总有效率、咬合力、美学评分(PSE)评分、牙痛情况和满意度。结果研究组总有效率90.00%高出对照组72.50%(P<0.05)。2组治疗前各指标均无区别(P>0.05),治疗后研究组咬合力和PSE评分均高出对照组(P<0.05)。研究组牙痛发生率7.50%低于对照组的25.00%(P<0.05)。研究组满意度95.00%较对照组80.00%更高(P<0.05)。结论MTA根尖屏障术的效果更为理想,促进咬合力改善,并提高软组织的美观度,牙痛发生率少,患者满意度高,值得推广。

体外评价新型根尖倒充填材料iRoot的生物学性能

目的:体外评价新型根尖倒充填材料iRoot BP plus和iRoot FS的生物学性能。方法:(1)将牙根预备成长3 mm、根管直径1 mm的试样,分别于根管内填充iRoot BP plus、iRoot FS和三氧化矿物凝聚体(mineral trioxide aggregate,MTA)。将制备好的试样置于模拟体液(simulated body fluid,SBF)中,用扫描电子显微镜观察暴露的材料表面矿物沉积情况,并通过X射线能谱对其表面形成的晶体进行元素分析,测定SBF的p H值随时间的变化。(2)将iRoot BP plus、iRoot FS和MTA制备成直径8 mm、高度2 mm的圆柱,制备DMEM浸提液,通过MTT实验观察材料对MG63细胞增殖活性的影响,并通过实时荧光定量PCR和碱性磷酸酶(alkaline phosphatase,ALP)染色分析材料对ALP基因及蛋白表达的影响。结果:(1)在SBF中浸泡24 h时,iRoot BP plus、iRoot FS和MTA表面均已有矿物沉积,14 d后有大量矿物沉积,钙∶磷比值分别为1.43、1.39和1.51;(2)iRoot BP plus、iRoot FS和MTA均可使SBF的p H升高,3周时分别为8.09±0.07、7.91±0.06和8.11±0.06;(3)以体积比为1∶5和1∶10稀释的iRoot BP plus、iRoot FS和MTA浸提液对MG63细胞的增殖无明显促进或抑制作用;(4)iRoot BP plus、iRoot FS和MTA组对MG63细胞ALP基因的表达均具有促进作用,ALP染色各组未见明显差异。结论:iRoot在模拟体液中可诱导矿物质沉积,促进MG63细胞的分化和矿化,具有良好的生物活性和促成骨作用。

特立帕肽对骨质疏松大鼠正畸牙移动中牙根吸收影响的mirco-CT研究

目的:使用mirco-CT探究特立帕肽对骨质疏松大鼠正畸牙移动过程中牙根吸收的影响。方法:将72只8周龄的雌性Wistar大鼠均分为去势组、特立帕肽组和对照组,对去势组及特立帕肽组行去卵巢手术并对对照组行假手术处理。12周后,对大鼠左上第一磨牙施加50 g牙移动力;每日给予特立帕肽组大鼠特立帕肽溶液皮下注射,去势组及对照组给予等量的PBS溶液。牙移动第0、7、14、21天处死大鼠、取材并行micro-CT扫描分析。结果:各组从7 d起可开始观察到牙根吸收陷窝,且陷窝体积随时间延长逐渐增大。去势组大鼠的牙根吸收与对照组相比较为严重,特立帕肽治疗可以显著降低骨质疏松大鼠牙移动21 d时的牙根吸收。结论:骨质疏松状态可加重大鼠牙移动过程中的牙根吸收,间歇性应用特立帕肽可以减少骨质疏松大鼠正畸牙移动中的牙根吸收。

纤维桩+复合树脂+氧化锆全瓷冠修复根管治疗后后牙楔状缺损的疗效分析

目的:探究纤维桩+复合树脂+氧化锆全瓷冠修复根管治疗后后牙楔状缺损患者的效果及美观满意度。方法:纳入2022年1月-2023年1月在笔者医院就诊的102例后牙楔状缺损患者,根据患者自主选择意愿分为研究组(n=50)和对照组(n=52),对照组行金属桩核+金属烤瓷冠修复,研究组行纤维桩+复合树脂+氧化锆全瓷冠修复。6个月后,对比两组临床疗效,观察两组牙周健康情况(牙龈指数、菌斑指数、龈沟出血指数),检测牙周炎症[肿瘤坏死因子-α(Tumor necrosis factor-α,TNF-α)、白细胞介素-4(Interleukin-4,IL-4)、白细胞介素-6(Interleukin-6,IL-6)],调查美观满意度[美国公共健康服务标准(United states public health service,USPHS)]和实用度(咀嚼功能、咬合情况、语言功能),比较两组并发症发生情况。结果:治疗后,研究组治疗有效率达92.00%,高于对照组的76.92%(P<0.05);两组牙周健康相关指数及TNF-α、IL-4、IL-6均较治疗前降低,且研究组降低幅度大于对照组(P<0.05);治疗后,研究组牙齿表面形态、色泽协调性、边缘着色满意度均高于对照组(P<0.05),两组咀嚼功能、咬合情况、语言功能均较治疗前提高,但差异无统计学意义(P>0.05);两组并发症发生率比较治疗组低于对照组(P<0.05)。结论:采用纤维桩+复合树脂+氧化锆全瓷冠修复根管治疗后后牙楔状缺损能够减轻炎症反应,提升患者牙周健康,增加美观满意度及实用度,疗效显著,安全性高。

Root ZX根尖定位仪准确性的体外实验研究

目的:分析影响Root ZX根尖定位仪测量牙齿操作长度准确性的因素。方法:选择根尖孔发育完成的单根管离体牙40个,在生理盐水琼脂模型上,分别在根管内灌注25g/L次氯酸钠液、生理盐水、170g/LEDTA、30mL/L过氧化氢液和蒸馏水,在根管干燥条件下,用Root ZX测量牙齿操作长度,分析根管内容物对Root ZX测量值的影响。另外,选择根尖缩窄大小各异的牙齿23个,用Root ZX测量根管长度,计算探测锉尖离根尖孔的距离,分析该距离与根尖缩窄大小的相关关系。结果:以距根尖孔0～1mm为标准,RootZX的准确率为97.5%。同一根管内不同内容物时,Root ZX测量值间的差异无统计学意义(P>0.05),探测锉尖离根尖孔的距离与根尖缩窄的大小呈正相关(r=0.8584)。结论:RootZX测量牙齿操作长度的准确性不受根管内容物的影响;根尖缩窄大小是影响Root ZX准确性的决定因素,电测长与根尖缩窄大小呈负相关。

牙槽骨微穿孔术用于中重度牙列拥挤伴前牙唇倾患者正畸治疗中的美学效果分析

目的探讨分析牙槽骨微穿孔术用于中重度牙列拥挤伴前牙唇倾患者正畸治疗中的美学效果。方法于2020年8月~2023年8月期间,选取我院中重度牙列拥挤伴前牙唇倾患者97例,均接受牙槽骨微穿孔术治疗,观察其治疗情况及美学效果。结果加力1个月后尖牙移动距离为(1.93±0.25)mm,牙根吸收量为(0.48±0.16)mm;加力2个月后尖牙移动距离为(3.69±0.47)mm,牙根吸收量为(0.57±0.19)mm。矫治后患者U1-NA距、U1-NA角低于矫治前,U1-L1高于矫治前(P<0.05)。矫治后红色美学指数(PES)评分为(10.27±1.68)分,高于矫治前(13.16±0.59)分(P<0.05)。患者对正畸治疗结果的满意度为97.94%。结论牙槽骨微穿孔术用于中重度牙列拥挤伴前牙唇倾患者正畸治疗中可促进正畸牙移动速度,提高矫治效果,且不会明显增加患者牙根吸收量,患者满意度高。