根管长度电测法准确性及其影响因素的探讨

目的:探讨JUSTY-Ⅱ电测仪测量根管工作长度的准确性及其影响因素。方法:选择148颗患牙,其中牙髓炎71颗,牙髓坏死46颗,根尖周炎31颗。随机分为2组,分别用指感法和电测法测量根管工作长度,以X线片影像为参照,用χ2检验比较其结果,并分析各临床病变类型、根管干湿状态和根管扩大等因素对电测法准确性的影响。结果:电测法准确率为87.84%,指感法为43.24%,2组有高度显著性差异(P<0.01)。根尖周炎组准确率与牙髓炎组、牙髓坏死组有显著性差异(P<0.05)。根管干湿状态对测量结果无影响,扩根前后准确率有显著性差异(P<0.05)。结论:电测法是一种准确、操作简便的测量根管工作长度的方法。根尖周组织的炎症以及根管扩大,均会降低其准确性。     

RayPex5根尖定位仪测量根管工作长度准确性的临床评价

采用手感法、电测法测量211 个根管工作长度,而后用X线片法对所确定的根管工作长度进行验证.电测法和手感法准确率分别为96.21%和78.20%,两者有显著统计学差异(P<0.001).电测法测量前牙和磨牙的准确率分别为100%和92.5%,两者有统计学差异(P<0.05),而测量根尖周有病变与无病变组、前牙与前磨牙组、前磨牙与磨牙组准确率均无统计学差异.研究表明,电测法测定根管工作长度准确性高,且测量前牙的准确率高于测量磨牙的准确率;Raypex 5 型根尖定位仪可以较准确地测量根管工作长度.     

根管长度测量仪的临床应用及影响因素

目的研究根管长度测量仪测量根管工作长度的准确性及其影响因素。方法选取150例需行根管治疗的患者,共计根管245个,以手感法和电测法先后测量根管工作长度,以插针摄片法计算的根管工作长度为准,进行准确率比较,并进行统计学分析。结果手感法准确率70.2%,电测法准确率93.5%,高于手感法。结论电测法准确率高,可结合手感法及插针摄片法应用于临床,提高根管治疗的疗效。     

根管长度电测仪测定后牙根管工作长度的临床研究

目的:探讨RootZX根管长度电测仪测量后牙根管工作长度的临床效果。方法:采用RootZX对60例79个后牙186个根管进行根管长度测量,以此长度进行根管预备,按测量长度插入牙胶尖摄X线牙片,计算出实际工作长度,计算RootZX测量根管工作长度的准确率。结果:在实际工作长度±0.5mm范围内,ZootZX测量准确率为87.6%,测量活髓和死髓牙根管工作长度的准确率无显著性差异(P>0.05)。结论:ZootZX根管长度测定仪测定根管工作长度准确性较高。     

Root ZX根管长测定器在根管治疗中的疗效评价

目的:评价RootZX型根管长度测定器测量根管长度的准确性。方法:分别用手感法和RootZX测定器测量根管长度,根充后拍摄X线片观察根充质量。结果:RootZX测量根管工作长度组根充适填率明显高于手感法组,两者有显著性差异(P <0 .0 1)。结论:RootZX型根长测定器方便、快捷,能够比较准确测量根管长度,提高根充适填率。     

根管治疗仪测定老年人磨牙根管工作长度准确性的初步研究

目的:初步探讨根管治疗仪在确定老年人磨牙根管工作长度方面的准确性.方法:随机选取须进行根管治疗的老年人磨牙132颗,实验组86颗分为治疗仪组和手感法组,治疗仪组患牙44颗,共131个根管,采用TRIAUTO ZX根管治疗仪确定工作长度,手感法组42颗,共126个根管,采用手感法确定工作长度;对照组46颗为X线片组作为标准组;所有根管预备后插诊断丝摄X线片,比较实验组和标准组测定工作长度的准确率.结果:治疗仪组131个根管中符合工作长度标准的有125个,准确率为95.42%;手感法组126个根管中符合工作长度标准的有103个,准确率为81.75%;标准组146个根管中符合工作长度标准的有139个,准确率为95.21%.X2检验显示,治疗仪组同对照组相比差异无显著性;手感法组同对照组相比差异有显著性.结论:根管治疗仪在老年人根管治疗中,对磨牙根管工作长度的测定方面,比手感法有更高的准确率,与X线片法可取得同样的效果.     

Dentaport ZX测量根管工作长度准确性临床评价

目的：研究Dentaport ZX根尖定位仪测量根管工作长度的准确性。方法：选取129个需进行根管治疗的恒牙为研究对象,插针摄X线牙片计算牙的长度,将电测法和手感法测得的根管工作长度与X线片法测得的根管长度相比较来计算电测法和手感法的准确率,并进行统计学分析。结果：电测法的准确率为89.92％,手感法的准确率为713.2％。结论：电测法的准确率高于手感法,Dentaport ZX根管测量仪使用方便、快捷,能够准确测量根管工作长度。     

应用Neosono根尖定位仪测量根管工作长度的临床研究

目的：研究根尖定位仪Neosono测量根管工作长度的准确性。方法：选取250个需行根管治疗的单根管牙为研究对象,以插针拍X线片计算牙的长度,将电测法和手感法测得的根管工作长度与X线片法测得的牙的长度相比较来计算电测法和手感法的准确率,并进行统计学分析。结果：电测法的准确率是94．8％,手感法的准确率是74％,电测法的准确率高于手感法。结论：手感法的准确率较低,可起参考作用,电测法准确率较高,可作为根管工作长度的常规测量,必要时可用X线片法来确认。3种方法联合应用,能够满足临床要求。     

Raypex 5根尖定位仪临床应用的准确性观察分析

目的：观察Raypex 5在临床应用中测量根管工作长度的准确性及影响因素。方法：共收集342例患者的903个根管,随机分为实验组和对照组。实验组458个根管采用Raypex 5测量根管工作长度。对照组445个根管,按手感法测量根管工作长度,拍摄X线片,分析比较,研究其准确性及影响因素。结果：在X线片上恰填范围内,实验组准确率达94.32%,对照组75.06%。电测法与手感法的准确率比较有显著性差异（P〈0.01）。牙髓活力,根尖骨质破坏状况,龋洞类型,牙位,牙齿形态,根管数目对Raypex 5测量根管工作长度的准确性无明显影响。结论：根尖定位仪Raypex 5能较为准确地测量根管工作长度,准确率比手感法高,值得临床推广使用。     

手感法和电测法确定根管工作长度的研究

目的 研究手感法和电测法的临床应用。方法 对118个根管用手感法和电测法分别测量其工作长度，并与X线法确定的真实工作长度相比较。结果 手感法测准确率为73.7%，而电测法准确率则高达96.3%；在根周有病变级和根周无病变组，手感法测准确率为60％和88％，电测法准确率达98.3%和94.8%；手感法准确度和电测法准确度均与牙位无统计学差异。结论 电测法比手感法的测量准确度高，且不受患牙情况影响，但手感法的准确度基本能满足正常临床需要。     

Root ZX在老年人后牙不同根管条件下的临床应用

目的:评价Root ZX在老年人牙髓病、根管再治疗中的应用,探讨其适用范围及操作注意事项。方法:随机选取58颗老年人后牙共148个根管作为研究对象,分为2组:A组,活髓牙;B组,根管再治疗牙。均用ProTaper进行根管预备,Root ZX测量预备前后根管工作长度,根管充填术后摄X线片评价准确性,随访2年。结果:A组,有74.7%根管在预备后工作长度超过预备前。B组,预备前后无明显差别。二组X线检查示,恰填率差异有显著性(P<0.01)。2年后治疗有效率89.2%,组间差异无显著性。结论:用Root ZX测量老年人的后牙根管长度,符合解剖生理情况,可以提高测量的准确性,提高治疗成功率。     

根管测量仪测定不同类型患牙工作长度准确性的探讨

目的:探讨不同类型患牙应用根管测量仪测量根管长度的准确性。方法:选择88例需要根管治疗的病例,共122颗患牙,均为单根牙,其中牙髓炎组62颗,根尖周炎组60颗。两组分别采用Root ZX根管测量仪测量根管工作长度并与X线法计算的根管工作长度比较,了解其应用在不同患牙时的准确性。结果:应用根管测量仪牙髓炎组的准确率优于根尖周炎组。结论:电测法测定根管工作长度快速、准确,但对较复杂的患牙,需用X线辅助校正电测法的结果。     

Accuracy of two electronic apex locators in primary teeth with and without apical resorption: a laboratory study

Aim To evaluate the accuracy of the Root ZX (J Morita Corp., Kyoto, Japan) and Tri Auto ZX (J Morita Corp.) devices for measuring root canal length in primary teeth with and without apical resorption. Methodology Thirty‐four extracted human primary molar teeth with resorption and 19 primary teeth without resorption were collected. After endodontic access preparation, the actual lengths of the teeth were determined. The teeth were then embedded in an alginate model to determine the electronic working length measurement. Statistical evaluation was completed using Student’s t‐tests. Results For the Root ZX, there was no significant difference between those teeth with root resorption and those without. However, for the Tri Auto ZX, there was a significant difference in the electronic measurements between those teeth with root resorption and those without (P < 0.05). Significant differences were found amongst the measurements of the two apex locators (P < 0.05). For root canals with resorption, the respective accuracy rates (within ±0.5 mm) of Root ZX and Tri Auto ZX were 83.33% and 89.47%; within ±1 mm, the Root ZX and Tri Auto ZX demonstrated 98.95% and 100% accuracy, respectively. For root canals with no resorption, the percentage of measurements within ±0.5 mm of the apical construction was 89.28% for the Root ZX and 80.35% for the Tri Auto ZX. The accuracy within ±1 mm of the Root ZX and the Tri Auto ZX was 98.22% and 100%, respectively. Conclusion Within the limitations of this laboratory study, the presence of resorption affected the performance of the Tri Auto ZX more than the Root ZX.     

Clinical evaluation of the measuring accuracy of ROOT ZX in primary teeth

OBJECTIVE: The aim of this study was to assess the accuracy of an electronic device (Root ZX; Morita, Tokyo, Japan) for measuring the root canal length in primary teeth. STUDY DESIGN: The pulp tissue was removed from 71 nonrestorable teeth scheduled to be extracted under general anesthesia, and the root canals (n = 105) were irrigated (H(2)O(2), 3%; NaOCl, 1%). Subsequently, the length was determined clinically with the electronic device prior to extraction. Treatments were performed by 2 dentists (42 and 63 root canals). After extraction, the real length was recorded and the 2 measurements were compared. RESULTS: Measurements were affected significantly by the dentists (P < .01; chi(2)). However, regression analysis revealed sufficient accuracy of the device, with a tendency to estimate the root canal length just short (x = -0.98 +/- 1.75 mm) of the apex. These results were not influenced by tooth type, root canal type, status of the periapex, or clinical condition (P > .05; chi(2)). CONCLUSION: Root ZX can be strongly recommended for clinical implementation of endodontics in primary teeth, particularly when treating fidgety children.     

The effects of sodium hypochlorite concentrations on the accuracy of an apex locating device

This study aimed to evaluate Root ZX accuracy with different NaOCl concentrations and to observe effects of the alginate model when NaOCl was used in the canal during electronic measurements. Fifty extracted single-rooted, single-canal human teeth were used in five experimental groups. NaOCl concentrations of 5.25%, 2.65%, 1.00%, and 0.50%, respectively, were injected into the root canals of teeth in four groups and distilled water in control group 5. After measuring root lengths with Root ZX, the files were locked in place. There were no statistically significant differences among all the groups (p > 0.95) when evaluating the distance of the file tips and apical constriction or for the distance from file tip to apical foramen. Root ZX could be used in root canal length measurements with various NaOCl concentrations. Designation of apical constriction needs more care. The alginate model could be used for in vitro electronic measurements with various NaOCl concentrations.     

临床根管预备对电子根尖定位仪精确性影响的研究

目的探讨根管预备对电子根尖定位仪(Electronic Apical Locator,EAL)精确性的影响。方法采用数字随机法把根管分为4组:初尖锉组:使用初尖锉取得手感法的根管工作长度并使用EALs(Root ZXand Raypex-5)测量根管工作长度;②扩一组:比初尖锉大1号的锉预备根管并使用EALs测量根管工作长度;③扩二组:扩至比初尖锉大2号的锉并用EALs测得根管工作长度;④扩三组:扩至比初尖锉大3号的锉并用EALs测得根管工作长度。将各组测量值与拔牙后直视状态下测得的根管长度进行比较。结果初尖锉组测量根管工作长度的准确率为:手感法55%,Root ZX85%,Raypex-590%;扩一组、扩二组和扩三组依次分别为:Root ZX90%、90%、95%,Raypex-595%、100%、100%。结论电测法测定根管工作长度准确率高,临床根管预备不会降低EAL的精确性。     

The influence of sodium hypochlorite irrigation on the accuracy of the Root ZX electronic apex locator

The purpose of this in vitro investigation was to determine whether the presence of sodium hypochlorite influences the accuracy of the Root ZX electronic apex locator. Forty, extracted, human teeth were mounted in an experimental apparatus. After achieving ideal access, working length measurements were obtained using the Root ZX. The canals were flushed with 2.125% sodium hypochlorite and measurements were again made with the electronic apex locator. Before measuring a third time, 5.25% sodium hypochlorite was then administered to each canal. Finally, the tooth was removed from the apparatus and the actual canal length was determined by measuring a file brought to the apical constriction (verified by direct visualization). No significant differences were found between the experimental groups. Overall, Root ZX measurements were within 0.5 mm of the actual length 83% of the time. The results of this study indicate that the Root ZX is not adversely affected by the presence of sodium hypochlorite.     

体内不同冲洗液对ROOT ZX电测仪准确性的影响

目的:体内评价不同冲洗液对Root ZX根尖电测仪测量结果的影响.方法:150颗需根管治疗的单根管牙随机分为5组,开髓,冠向敞开后同时去除根管内牙髓后分别以3 %H2O2、17?TA、0.5%NaOCl、生理盐水冲洗根管3次,最后一次保留冲洗液,进行根管测量.空白组为0.5%次氯酸钠和生理盐水交替冲洗后的干燥根管.各组测量3次的平均值与X片确定的根管长度值以单因素方差分析(ANOVA)分析各组间差异.结果:各组根管长度测量值与实际根管长度无显著性差异,单因素方差分析显示各组间测量值无显著性差异.结论:ROOT ZX根尖定位仪能准确测量根管长度,且不受根管内冲洗液的影响.     

The ability of root ZX apex locator to reduce the frequency of overestimated radiographic working length

The aim of this in vitro study was to evaluate the ability of the Root ZX device to avoid instrumentation beyond the apical foramen in premolars after conventional working length radiography. Thirty extracted premolars with 43 root canals were subjected to radiographic and electronic working length determination. Radiographic working length determination resulted in overestimation in 51% of the root canals, although the measuring file tip was located to be 0 to 2 mm short of the radiographic apex. Electronic working length measurements with the Root ZX reduced the percentage of overestimation to 21%. In 6 root canals (14%), both radiographic and electronic working length measurements led to overestimation. It is concluded that complementing radiographic working length determination with electronic apex locator measurements may help to avoid overestimation beyond the apical foramen in premolars.