A Root Canal Therapy on the Maxillary First Molar Tooth with Five Canals: A Case Report

Maxillary first molar usually exhibits a radicular anatomy of three roots and three or four canals. However, different anatomic variations like extra number of roots and canals are possible. For a successful treatment, clinicians must have well equipment and a thorough knowledge of the external and internal anatomy of teeth and its variation. Using of CBCT may help to locate extra canals by giving a chance to clinicians to see the root canal anatomy in 3-D view. The aim of this study was to present a case report about a diagnosis and treatment in maxillary first molar with three roots and five canals. It is concluded that the diagnosing and the treatment of unusual cases are key factors for successful endodontic treatment of these teeth.

Therapeutic effect of neurogrowth factor in the treatment of gingival pain and swelling in patients with dental pulp necrosis after root canal therapy

Objective: To explore the clinical efficacy of neurogrowth factor in the treatment of gingival pain and swelling in patients with dental pulp necrosis after root canal therapy and the effect on the serum inflammatory cytokines. Methods: A total of 156 patients with gingival pain and swelling after root canal therapy due to dental pulp necrosis were included in the study and randomized into the control group (n=78) and teh treatment group (n=78). The patients in the control group were given metronidazole tablets. On the above basis, the patients in the treatment group were given local injection of neurogrowth factors. 10-day treatment was regarded as one course, and the patients were continuously treated for 2 courses. The improvement of clinical symptoms before and after treatment in the two groups was evaluated. Gingival sulcus index and serum inflammatory cytokines before and after treatment in the two groups were detected and compared. Results: When compared with before treatment, the periodontal soft tissue swelling, tooth mobility, and periapical pain scores after treatment in the two groups were significantly reduced, and those in the treatment group were significantly lower than those in the control group. When compared with before treatment, the gingival sulcus bleeding index 1 and 2 courses after treatment in the two groups was significantly reduced, and that 2 courses after treatment was significantly lower than that after 1 course treatment. The gingival sulcus bleeding index 1 and 2 courses after treatment in the treatment group was significantly lower than that in the control group. When compared with before treatment, the serum IL-8 and IL-6 levels after treatment in the two groups, and TNF-α level after treatment in the treatment group were significantly reduced, and the above indicators in the treatment group were significantly lower than those in the control group. Conclusions: The neurogrowth factors in the treatment of gingival pain and swelling in patients with dental pulp necrosis after root canal therapy can effectively improve the clinical symptoms, and inhibit the inflammatory reaction, with a significant efficacy.

牙体牙髓病根管治疗应用iRoot SP冷侧法的效果

目的探讨牙体牙髓病根管治疗应用iRoot SP冷侧法的效果。方法筛选2018-06至2020-06在解放军总医院京南医疗区就诊的牙体牙髓病患者100例,随机分为对照组和试验组,每组50例,均进行根管治疗,其中对照组充填根管采用热牙胶垂直加压法,试验组采用iRoot SP冷侧法。比较两组根管充填效果、临床总有效率、疼痛视觉模拟评分(VAS)及咀嚼功能。结果两组治疗后根管充填效果和临床总有效率比较,差异无统计学意义(P>0.05);试验组治疗后1周[(4.13±0.79)vs.(5.11±0.98)]及1个月[(2.45±0.37)vs.(3.11±0.67)]VAS评分低于对照组,治疗后咬合力[(131.25±11.21)lbs vs.(120.34±14.09)lbs]及咀嚼效率[(90.12±4.13)%vs.(78.98±7.45)%]均优于对照组,差异均有统计学意义(P<0.05)。结论根管治疗牙体牙髓病中应用iRoot SP冷侧法的充填效果和疗效与热牙胶垂直加压法基本相同,但iRoot SP冷侧法在减轻患者疼痛,改善咀嚼功能方面更具优势。

Tooth anatomy risk factors influencing root canal working length accessibility

The aim of this study was to analyze the specific influence of root canal anatomy on the accessibility of working length during root canal therapy. Four hundred seventy-six root canal therapy cases （amounting to a total of 1 005 root canals） were examined. The anatomy risk factors assessed in each case included： tooth type （tooth location）, root canal curvature, and root canal calcification, as well as endodontic retreatment. The investigation examined the correlation between each of these anatomic factors and the working length, with statistical analysis consisting of Chi-square tests and multiple logistic regression analysis. In an independent factor analysis, tooth type （tooth iocation）, root canal curvature, canal calcification, and endodontic retreatment were determined to be the primary risk factors. In a multiple-factor regression model, root curvature and canal calcification were found to most significantly influence root canal working length accessibility （P〈0.05）. Root canal anatomy increases the difficulty of root canal preparation. Appropriate consideration of tooth anatomy will assist in accurate determination of preparation difficulty before instrumentation. This study alerts clinical therapists to anatomical factors influencing the working length accessibility, and allows for a direct estimate of success rate given in situ measurements of tooth factors during the root canal treatment procedure.

Determination of the Root Canal Length of Teeth of Bantu Patients Attending the Teaching Hospital of Kinshasa University

Background: There is paucity of literature on the determination of the root canal length of Bantu subjects in dental professional practicing in Africa and Democratic Republic of Congo in particular. Aims: The aim of the present study was to determine the root canal length of teeth of Bantu patients extracts attending the Teaching Hospital of Kinshasa University. Methods and Material: Prospective cross-sectional study was carried out in the service of Conservative Dentistry. The patients suffering with pulpitis of permanent teeth which were selected for root canal treatment during the period of January 2014 to December 2016 were included. All patients whose main root canals were inaccessible, teeth carrying prosthesis, teeth with large coronal decay, teeth having periapical periodontitis, supernumerary teeth, wisdom and primary teeth were excluded. Results: The upper canines presented some significant longer canals compared to the lower canine (23.4 ± 2.3 mm and 21.6 ± 1.8 mm). Palatal canals of the first and second molar were respectively longer as compared to the superior teeth canals (21.5 ± 1 mm, 21.3 ± 2 mm). The distal canals of the first and second molar were the longest in the mandibular arch respectively measuring 20.7 ± 2.0 mm and 21.5 ± 1.7 mm. Conclusion: Data obtained from Bantu patients show slightly shorter roots compared to some European populations, but longer than some Asian populations.

Comparison of Two Electronic Root Canal Length Measurement Devices: The Differences between Ratio Two Impedance Frequencies and Multi Frequencies

Accuracy electronic root canal length measurement devices were important for root canal treatment. Aim: To evaluate and compare accuracy of the two electronic root canal length measurement devices;two frequencies impedance ratio and multi frequencies. Methods: Forty anterior teeth were sectioned on their cervical area. All samples were measured root canal length by radiographic. On the second phase, all the samples were measured by two frequencies impedance ratio and multi frequencies electronic devices. In the final phase, the teeth were split vertically and actual lengths were measured. All measurement by radiographic and electronic method was subtracted with actual length. Statistical analysis was performed using Chi-square and the Kolmogorov-Smirnov test. Results: Accuracy of the two frequencies impedance ratio 50% and multi frequencies 47.5%. No statistical significance between two frequencies impedance ratio and multi frequencies. Conclusions: There is no difference between ratio two impedance frequencies and multi frequencies.

新型生物陶瓷材料iRoot SP在微创根管治疗中的应用效果

目的研究在微创根管治疗中应用新型生物陶瓷材料iRoot SP的临床效果。方法选取100例本院于2022年3月—2023年5月收治的微创根管治疗患者,应用随机法分组,分为观察组和对照组,每组50例。其中观察组采用新型生物陶瓷材料iRoot SP填充,对照组采取AH-PLUS糊剂填充,比较两组治疗有效率、治疗前后牙周健康状态(牙周探诊深度、龈沟出血指数、牙龈指数、牙菌斑指数)、术后疼痛评分、术后观察期间急症反应发生率以及不良反应(瘙痒、红肿、肿痛)发生率。结果治疗6个月后,观察组、对照组治疗有效率比较,观察组更高(P<0.05);术后1、3、5、7 d,观察组疼痛评分相比对照组均更低(均P<0.05);治疗后,观察组牙周探诊深度、龈沟出血指数、牙龈指数、牙菌斑指数等指标水平均低于对照组(均P<0.05);随访6个月,观察组急症反应发生率以及不良反应发生率均低于对照组(均P<0.05)。结论应用新型生物陶瓷材料iRoot SP微创根管治疗,可提高患者治疗效果,使患者疼痛减轻,有利于患者口腔健康。

微创根管治疗中使用iRoot SP与AH PLUS材料对牙髓炎患者填充效果、炎症和疼痛的影响比较

目的:比较微创根管治疗中使用爱汝特SP生物陶瓷根管封闭糊剂(iRoot SP)与登士柏AH Plus根管充填材料(AH PLUS)对牙髓炎患者填充效果、炎症、疼痛的影响.方法:选择本院2023年1月至2023年6月收治的牙髓炎患者80例,随机分成对照组和观察组(n=40),微创根管治疗中对照组用AH PLUS,观察组用iRoot SP.治疗1 w后对比填充效果;治疗前、治疗1 w后采用酶联免疫吸附法测定龈沟液炎症因子肿瘤坏死因子-α(Tumor necrosis factor-α,TNF-α)、C-反应蛋白(C-reactive protein,CRP)、细胞白介素-6(Interleukin-6,IL-6)水平;治疗前、治疗后12 h、24 h、72 h采用视觉模拟评分(Visual Analogu Scale,VAS)评估患者疼痛程度;治疗前、治疗1 w后采用牙周探针测定牙周袋深度(Periodontal pocket depth,PD)、牙龈指数(Gingival index,GI)、菌斑指数(Plaque index,PIL);观察记录治疗期间的不良反应.结果:观察组总适填率高于对照组(P<0.05);观察组治疗1 w后TNF-α、CRP、IL-6、治疗后12 h、24 h VAS评分以及治疗1 w后PD、GI、PIL均低于对照组(P<0.05);两组不良反应差异无统计学意义(P>0.05).结论:牙髓炎患者微创根管治疗中使用iRoot SP填充效果更好,改善炎症、疼痛、牙周指标更有效.

Endodontic management of the maxillary first molars with two root canals: A case report and review of the literature

BACKGROUND The complex anatomy of the maxillary first molars has always been a major challenge for complete root canal treatment in endodontic therapy. Here, we present two cases of maxillary first molars, each with only two root canals, which have been rarely reported. We also perform a literature review of maxillary first molar anatomy.CASE SUMMARY The two patients were referred to the hospital after 1) finding a cavity in their tooth with a color change and, 2) a toothache during mastication, respectively.Both of these cases were diagnosed as apical periodontitis by X-ray imaging and cone beam computed tomography(CBCT). Non-surgical endodontic therapy was performed with the assistance of a dental operating microscope(DOM). CBCT showed rare but accurate images of both patients, each with two root canals and two roots in their maxillary first molars. Both roots were located in the buccal in the palatal direction, and each root had only one clear root canal. In addition,each maxillary first molar in both patients was symmetrical to that on the opposing side with only two separate root canals. Non-surgical endodontic therapy was performed with the assistance of a DOM. Finally, the teeth were restored using composite resin and the patients were satisfied with the results.CONCLUSION Making full use of CBCT and DOM would contribute to helping dentists make correct diagnoses and successfully treat teeth with rare root canal morphologies.

Three-dimensional inlay-guided endodontics applied in variant root canals: A case report and review of literature

BACKGROUND Root canal retreatment is common after root canal therapy in clinical situations.Especially,completing the retreatment of variant root canals can be challenging.This is particularly true for the molars located at the end of the dental arch.However,advancements in digital dental diagnosis and treatment techniques can solve these problems.Here,we describe a case of a maxillary second molar with a variant distobuccal root canal treated via a novel“inlay-guided endodontics”technique based on improved computer-generated programs.CASE SUMMARY A 63-year-old man complained of a defect in the maxillary left second molar.The tooth,diagnosed with post-treatment endodontic disease,was initially treated by conventional methods,which were ineffective.Our“inlay-guided endodontics”technique was subsequently adopted,with the establishment of a precise integrated three-dimensional(3D)plate model of cone-beam computed tomography data and a digital impression of the dentition.An optimal root canal approach was generated for the“virtual file”in the 3D model.The plate data were imported into a 3D printer and printed.With the help of the guide plate,the file was accurately placed into the cervical third of the distal root canal.The root canal and prosthodontic treatments successfully proceeded subsequently.CONCLUSION Our newly developed inlay guide plates may facilitate individualized and minimally invasive root canal treatment.

Successful individualized endodontic treatment of severely curved root canals in a mandibular second molar:A case report

BACKGROUND The incidence rate of severely curved root canals in mandibular molars is low,and the root canal treatment of mandibular molars with this aberrant canal anatomy may be technically challenging.CASE SUMMARY A 26-year-old Chinese female patient presented with intermittent and occlusal pain in the left mandibular second molar.The patient had undergone filling restoration for caries before endodontic consultation.With the aid of cone beam computed tomography(CBCT),a large periapical radiolucency was observed,and curved root canals in a mandibular second molar were confirmed,depicting a severe and curved distolingual root.Nonsurgical treatments,including novel individualized preparation skills and techniques and the use of bioceramic materials as an apical barrier,were performed,and complete healing of the periapical lesion and a satisfactory effect were achieved.CONCLUSION A case of severely curved root canals in a mandibular second molar was successfully treated and are reported herein.The complex anatomy of the tooth and the postoperative effect were also evaluated via the three-dimensional reconstruction of CBCT images,which accurately identified the aberrant canal morphology.New devices and biomaterial applications combined with novel synthesis techniques can increase the success rate of intractable endodontic treatment.

The Effect of Ultrasonic Method for Preparing Root Canals:A Scanning Electron Microscopic Evaluation

Sixteen fresh extracted human teeth paired according to their anatomic locations,were divided into two groups at random.The root canais of the teeth in Group 1 were preparedwith an ultrasonic unit and those of Group 2 with hand instruments.Then,the specimens wereobserved under a scanning electron microscope and their pnotographs were taken.Blindevaluation of cleanness was performed for each canal.Statistical dnalysis of the data indicatesthat the canal walls were cleaner in Group 1 than in Group 2 and that the ultrasonic preparationtook less time.

Which treatment protocol, among classical methods and/or various laser applications is the most effective in root canal disinfection, <i>in vitro</i>? A systematic review

Purpose: The aim of this systematic review was to answer the question “Which treatment protocol, am- ong classical methods and/or various laser applica- tions is the most effective in root canal disinfection, in vitro”. Materials and Methods: A MEDLINE, a Co- chrane and an Embase search (three specified search- es) were conducted to identify randomized controlled trials (RCT) until June 2010, conducted on human teeth and published in English, German or French language, examining the root canal disinfection after the use of lasers with or without mechanical instru-mentation. Additionally, hand search was conducted and contact with authors, when needed. Results: The MEDLINE, the Cochrane and the EMBASE search identified 240, 28, and 35 published articles, respec-tively. Ten articles from the MEDLINE and 5 articles from the Cochrane search (that were also identified in the MEDLINE search) met the inclusion and va-lidity assessment criteria. In E. faecalis elimination, instrumentation of the root canal and diode laser/665 nanometer/1 Watt (diode laser/665 nm/1 W) irradia-tion with the combined effect of Methylene Blue (MB) as photosensitizing agent (logCFU/ml = 1636) seemed to be the best method. In P. aeruginosa and in A.naeslundii elimination, instrumentation of the root canal followed by irrigation with 5, 25% NaOCl (log-CFU/ml = 0) seemed to be the best method. In gen-eral, instrumentation of the root canal followed by irrigation with 5, 25% NaOCl (logCFU/ml = 0) and instrumentation of the root canal and Er: YAG laser/ 2940 nm/0.8 W irradiation (logCFU/ml = 1924) seemed to be the best (polymicrobial studies). Conclusions: There are treatment protocols with the assistance or not of laser irradiation that can eliminate E. faecalis, E. coli and S. aureus inside the root canal. However, there is a serious number of S. anginosus, F. nuclea-tum, A. naeslundii and P. aeruginosa that remain in-side the root canal even after laser irradiation. New research is needed in order to set a treatment proto-col effective in the root canal disinfection from all bac-teria that are related to endodontic origin pathology.

Effects of different root canal preparation methods on root fracture resistance:A systematic review of the literature

AIM: To study the root fracture resistance after root canal preparation with Ni-Ti rotary instruments and stainless hand instruments by means of meta-analysis.METHODS: Literature was researched in CNKI and CBMDisc, Pub Med, CALIS, Proquest, Web of Scienceand 11 kinds of Chinese or English dentistry journals. Retrieval time on Internet was in all years and hand retrieval time was from January 2013 to October 2013. The literatures were selected through reading abstracts and full texts by two reviewers independently and Revman 5 software was used to analysize the literature. RESULTS: Six articles met the inclusion criteria. According to Meta-analysis of tooth root bending properties, total standardized mean difference(SMD) was 0.63(95%CI:-0.24-1.50, P > 0.05). That indicated there was no statistically significant between the two groups. Subgroup analysis was carried out. SMD were 2.22(95%CI: 0.23-4.20, P < 0.05) and-0.61(95%CI:-1.05--0.17, P < 0.05) when the premolar teeth with a single canal or the mesiobuccal roots of molars were used as the materials for tests to compare the effects of different root canal preparation methods on root fracture resistance. That only indicated that there were statistically significant in two subgroups.CONCLUSION: In vitro experiments, the effects on the fracture resistance of root had no statistical difference with Ni-Ti rotary instruments and stainless steel hand instruments in root canal preparation.

根管封闭剂iRoot SP与AH Plus在难治性前牙根尖周病患者根管治疗中的应用效果比较

目的比较根管封闭剂iRoot SP与AH Plus在难治性前牙根尖周病患者根管治疗中的应用。方法选取2021年2月至2022年2月江苏省常州市中医医院口腔内科行根管治疗的难治性前牙根尖周病患者(单颗患牙)112例,按照随机数字表法将其分为iRoot SP组(56例)与AH Plus组(56例)。iRoot SP组采用iRoot SP根管封闭剂,AH Plus组采用AH Plus根管封闭剂。比较两组根管充填质量,比较两组治疗前及治疗后1周的视觉模拟评分法(VAS)评分,比较两组治疗前及治疗后6个月的根尖周指数(PAI),并评估两组疗效。结果iRoot SP组恰充率高于AH Plus组,差异有统计学意义(P<0.05)。治疗后1周,两组VAS评分低于治疗前,且iRoot SP组低于AH Plus组,差异有统计学意义(P<0.05)。治疗后6个月,两组PAI低于治疗前,且iRoot SP组低于AH Plus组,差异有统计学意义(P<0.05)。iRoot SP组疗效优于AH Plus组,差异有统计学意义(P<0.05)。结论与AH Plus根管封闭剂比较,iRoot SP根管封闭剂应用于难治性前牙根尖周病患者根管治疗中能提高根管充填质量,缓解疼痛程度,促进病情恢复,改善治疗效果。

新型生物陶瓷材料iRoot SP在微创根管治疗中的应用效果及其对患者牙周健康的影响

目的:观察新型生物陶瓷材料iRoot SP在微创根管治疗中的近期应用效果和远期牙周疼痛与牙周健康状态。方法:选择2020年1月至2022年2月在承德市口腔医院收治的行微创根管治疗患者116例,采用随机数字表法分为AH-PLUS组和iRoot SP组,各58例。AH-PLUS组根管填充物采用AH-PLUS糊剂,iRoot SP组根管填充物采用新型生物陶瓷材料iRoot SP,两组术后均观察7d,并随访6个月。统计两组术后7d近期疗效、术后6个月治疗成功率,采用牙周探诊深度(PD)、龈沟出血指数(BI)、牙龈指数(GI)、菌斑指数(PLI)于术前及术后7d对患者牙周健康情况进行评估,采用视觉模拟评分于术后1、3、5、7d对患者术后疼痛情况进行评估,根据Mohd Sulong标准于术后观察期间对患者急症反应发生情况进行评估,采用口腔医学治疗满意度评价量表于术后7d评价患者治疗满意度。结果:与AH-PLUS组比较,iRoot SP组术后7d总有效率和术后6个月成功率显著升高,差异具有统计学意义(94.83%vs77.59%,χ^(2)=6.202,P=0.013,94.83%vs75.86%,χ^(2)=8.340,P=0.013);与组内术前比较,两组治疗后PD、BI、GI、PLI评分均显著降低,两组治疗后PD、BI、GI、PLI评分比较,差异具有统计学意义(P<0.05)。术后1、3、5、7d,两组疼痛评分呈逐渐降低趋势,且在不同时间点比较,iRoot SP组疼痛评分低于AH-PLUS组疼痛评分(P<0.05)。与H-PLUS组比较,iRoot SP组术后观察期间急症反应率显著降低,差异具有统计学意义(5.17%vs17.24%,χ^(2)=4.245,P=0.013)。与H-PLUS组比较,iRoot SP组术后7d总满意率显著升高,差异具有统计学意义(93.10%vs74.14%,χ^(2)=74.14,P=0.013)。结论:与AH-PLUS糊剂相比,采用新型生物陶瓷材料iRoot SP对微创根管治疗患者进行根管填充的治疗效果更好,值得在临床推广。

IRoot Sp对慢性闭锁性牙髓炎根管治疗患者IL-6、PCT及CRP水平的影响

目的分析IRoot Sp对根管治疗的慢性闭锁性牙髓炎患者白细胞介素-6(IL-6)、降钙素原(PCT)及C反应蛋白(CRP)水平的影响。方法收集2021年1月—2022年12月行根管治疗的慢性闭锁性牙髓炎101例的临床资料,按照治疗方案分为观察组54例和对照组47例。对照组应用AH PLUS,观察组应用IRoot Sp。比较2组手术前后视觉模拟评分法(VAS)评分、术后急症反应发生率、炎性因子、牙周相关指标。结果2组术后VAS评分随着时间延长而下降,且观察组下降幅度大于对照组(P<0.05,P<0.01)。观察组术后急症反应发生率低于对照组(P<0.05)。观察组术后IL-6、PCT、CRP水平低于对照组(P<0.01)。2组术后1、3个月菌斑指数、牙周袋探诊深度均低于术前,且观察组低于对照组(P<0.05,P<0.01)。结论慢性闭锁性牙髓炎根管治疗患者应用IRoot Sp可有效减轻术后疼痛,降低IL-6、PCT及CRP水平,且远期疗效理想。

iRoot SP一次性根管治疗前牙窦道型慢性根尖周炎疗效观察

目的:观察iRoot SP一次性根管治疗前牙窦道型慢性根尖周炎的临床疗效。方法:纳入240例前牙窦道型慢性根尖周炎患者,随机分成2组(n=120),在Nd:YAG激光消毒下,进行一次性根管充填:观察组采用iRoot SP以热牙胶连续波垂直加压技术充填根管,对照组采用AH-plus糊剂以热牙胶连续波垂直加压技术充填根管,观察术后48 h疼痛发生情况、术后10 d窦道愈合情况及1年后的疗效。结果:术后48 h观察组和对照组疼痛发生率分别为7.14%和15.0%(P=0.038);术后10 d,观察组和对照组窦道愈合情况有效率分别为95.8%和88.3%(P=0.031);术后1年复诊,2组疗效成功率分别为98.3%和94.8%(P>0.05)。结论:iRoot SP和AH-plus糊剂在一次性根管治疗前牙窦道型慢性根尖周炎中均取得良好疗效,但iRoot SP术后反应发生率低,窦道愈合快。

MTA、iRoot BP Plus在难治性前牙根尖周病患者根管治疗中的应用比较

目的对比无机三氧化物聚合物(MTA)、iRoot BP Plus在难治性前牙根尖周病患者根管治疗中的应用效果。方法选取2016年3月—2018年3月承德医学院附属医院口腔科收治的246例难治性前牙根尖周病患者,均为单颗患病且实施根管倒充填治疗。其中82例患者采用MTA治疗(MTA组),84例患者采用iRoot BP Plus治疗(iRoot BP Plus组),80例患者接受氢氧化钙糊剂治疗(对照组)。对比根充质量、治疗前和治疗1周后局部红肿、疼痛评分,不同时刻旧根尖指数(O-PAI)变化及临床疗效。结果iRoot BP Plus组适充率较MTA组和对照组高(P<0.05)。MTA组治疗前和治疗1周后局部红肿、疼痛评分的差值较对照组高(P<0.05),iRoot BP Plus组最高(P<0.05)。iRoot BP Plus组O-PAI评级较MTA组、对照组低(P<0.05),相对效果较好;MTA组治疗后较对照组低(P<0.05),相对效果较好。iRoot BP Plus组临床总有效率最高(P<0.05)。结论在难治性前牙根尖周病患者根管治疗中MTA、iRoot BP Plus均优于氢氧化钙糊剂,且应用iRoot BP Plus可保证适充率,并有效减轻局部红肿、疼痛,改善O-PAI,疗效理想,有望替代MTA推广应用。

iRoot SP糊剂根尖封闭效果的实验研究

目的通过模拟根管的染料渗透试验评价iRoot SP糊剂的根尖封闭性能。方法模拟根管样本88个,随机分为4个实验组(每组20颗)和1个阳性对照组(8颗),A1组采用iRoot SP糊剂单尖充填法充填;A2组采用iRoot SP糊剂热垂直加压充填;A3组采用AH-plus糊剂单尖充填法充填;A4组采用AH-plus糊剂热垂直加压充填。将样本置于亚甲基蓝中进行染料渗透,口腔手术显微镜下拍照测量染料渗透长度;分光光度法检测染料渗透量。结果各实验组均有不同程度的染料渗透,其中A1组染料渗透的长度和量均大于A2组,差别有统计学意义(P<0.01);A2组染料渗透的长度和量均大于A4组,差别有统计学意义(P<0.01)。结论 iRoot SP糊剂的根尖封闭效果较AH-plus根管糊剂差;当使用iRoot SP糊剂进行根管充填时,热牙胶垂直加压充填的效果比单尖充填的封闭效果好。