Raypex5根尖定位仪在测量根管工作长度中的临床应用

目的评价Raypex5根尖定位仪测量根管工作长度与X线法的符合性。方法用Raypex5根尖定位仪对205颗患牙共403个根管进行根管工作长度测量，以此长度进行根管预备充填后拍摄X线片观察根管充填的质量。结果Raypex5根尖定位仪测量根管工作长度后根管适充率为96．28％。结论Raypex5根尖定位仪是一种准确可靠安全有效根管工作长度测量仪器。     

根尖定位仪测量根尖破坏牙根管长度的准确性研究

目的 比较Root ZX,Propex,Justy Ⅱ和 Raypex5 4种根尖定位仪测量根尖受破坏牙齿工作长度的准确性.方法 将53颗离体牙沿釉牙骨质界截冠、去髓,根管预备到25#,使用Root ZX(A组),Propex(B组),Justy Ⅱ(C组)和 Raypex5(D组) 4种根尖定位仪分别测量每个根管的工作长度;再使用超声倒预备工作尖将以上各牙沿根尖孔破坏根尖狭窄部,再次用4种根尖定位仪测量工作长度.结果 所得数据与解剖镜下测量的实际数据进行比较,根尖完整时A、B、C、D4组数据在-0.5～0.5 mm误差范围内的百分数分别为86.3%、88.8%、85.0%、88.8%.根尖破坏时A、B、C、D4组数据在-0.5～0.5 mm误差范围内的百分数分别为16.7%、20.5%、10.3%、48.7%,在-1～1 mm误差范围内的百分数分别为74.4%、52.6%、57.7%、91.0%.结论 4种根尖定位仪对于根尖破坏的牙齿测量准确性比根尖完整的牙齿要低,相比之下Raypex5的准确性比较高.     

3种根尖定位仪不同条件下定位根管侧穿孔准确性的体外研究

目的 比较Propex、Raypex(R)5、Root ZX根尖定位仪在不同根管冲洗液中定位根管侧穿孔位置的准确性.方法 选取19颗新鲜拔除的前磨牙,采用ET40超声工作尖破坏根管中下部根管壁,制备根管侧穿孔.使用Propex、Raypex(R)5、Root ZX根尖定位仪定位穿孔位置,比较3种根尖定位仪在不同根管冲洗...     

3 种根测仪定位根管侧穿孔准确性的比较研究

目的:比较研究Propex,Raypex 5,Root ZX全自动根管长度测量仪(根测仪)定位根管侧穿孔位置的准确性.方法:选取40 颗离体前磨牙,采用ET40超声工作尖破坏根管中下部根管壁,造成根管侧穿.建立体外模型,使用Propex,Raypex 5,Root ZX全自动根管长度测量仪定位穿孔位置,并比较3 种根管长度测量仪测量准确性.结果:Propex, Raypex 5, Root ZX全自动根管长度定位测量仪测量,均是定位于根管穿孔外壁的位置,并且Propex的准确率为90%, Raypex 5测量准确率为87.5%,Root ZX测量准确率为85%,但3 组准确率的差异无统计学意义(P>0.05). 结论:对于根管壁侧穿的牙齿,使用Propex, Raypex 5,Root ZX全自动根管长度定位测量仪定位的穿孔位置均具有较高的准确性.     

Raypex 5根尖定位仪测定牙根管长度的准确率及影响因素分析

目的 观察Raypex 5根尖定位仪测定牙根管长度的准确率,探讨影响准确率的因素.方法 选择210例牙髓病及根尖周病患者,其中225颗患牙含416个根管,先用手感法测量长度,再用根尖定位仪测定长度,充填主牙胶尖后在数字化X线成像系统上拍片确定牙齿工作长度,两者对比并进行统计学处理.结果 Raypex 5根尖定位仪测定牙根管长度准确率为93.99％,手感法准确率为74.76％.两者差异具有统计学意义（P＜0.05）;根尖定位仪测量单根管至四根管的准确率明显高于手感法,两者间的差异也具有统计学意义（P＜0.05）.结论 Raypex 5根尖定位仪测定牙根管长度操作简便,较少的X线辐射,准确率较高.     

Raypex5根管长度测量仪准确性的临床及体外实验研究

目的：研究不同根管内容物（17％EDTA凝胶、生理盐水、5．25％次氯酸钠溶液）和根尖孔面积大小对Raypex5根管长度测量仪测量准确性的影响。方法：选取需要拔除的60颗单根管患牙,采用Raypex5根测仪在不同根管介质环境下,测量根管工作长度（EwLl）,拔除患牙后在体视显微镜下测得根管实际工作长度（L1）;并建立体外模型,测量不同根尖孔面积（s）、根管工作长度（EWL2）和实际根管长度（L2）,对根管在3种介质环境下Raypex5根测仪所测长度行单因素方差分析,与实际根管长度比较采用配对t检验;对根尖孔面积与Raypex5电测法测量值偏差之间的关系采用直线相关分析。结果：①．三组不同根管介质中的根管长度测量值之间差异无统计学意义（P〉0．05）。②．不同介质的根管长度测量值与根管实际长度之间的偏差无统计学意义（p〉0．05）。③．当根尖狭窄破坏后,根尖孔面积与根测仪测量值的偏差之间存在线性相关关系,（P〈0．0D。结论：Raypex5根管长度测量仪的准确性不受根管内介质的影响。当根尖狭窄被破坏后,根尖孔面积对Raypex5测量准确性有影响,临床上对根尖有吸收破坏或根尖未发育完全的患牙采用Raypex5电测法测量时,应谨慎参考根管工作长度值。     

Digora及Propex测量根管工作长度准确性的比较研究

目的：评价数字化牙片系统Digora及电子根尖定位仪Propex测量根管工作长度的准确性,为临床应用提供参考依据。方法???选取临床中需拔牙的90例患者260颗患牙（369个牙根）为研究对象,首先对患牙拍摄数字化牙片,利用Digora系统中的长度工具测量牙片上牙齿根管长度,然后对患牙开髓,电子根尖定位仪Propex测量根管工作长度,最后拔除患牙直视下测量根管实际长度并以此长度为标准,计算Digora牙片测量法、Propex电测法与实际根管长度的差值,分别以1、1.5?mm误差评定两法测量根管工作长度的准确性。结果???牙片法测量值与拔牙实测值差值为（2.163±1.194）mm,电测法测量值与拔牙实测值差值为（0.214±0.542）mm。以1?mm内为可接受范围,牙片法准确率为21.68%,电测法为91.87%;若以1.5?mm以内为可接受范围,则两法准确率分别为30.35%、95.66%。牙片法准确率均明显低于电测法（P<0.01）。结论??采用Digora系统长度工具直接测量牙片上根管长度时,误差较大,不能直接指导临床操作。Propex能较准确地测量根管工作长度。     

根管内血液对根尖定位仪Raypex5测量准确性的影响

目的:通过体外实验评价根管内血液对根尖定位仪Raypex5测量牙齿工作长度准确性的影响.方法:选择单根管离体牙30颗,用直接测量法取得根管实际长度.用生理盐水琼脂模型作为体外测试模型,用Raypex5分别在根管干燥、内有部分血液、充满血液3种情况下测量根管工作长度.结果:直接测量法与电测法数据进行比较,测量值间差异无统...     

2种根尖定位仪测定根管长度准确性的比较

目的研究Raypex 5和Elements Diagnostic 2种根尖定位仪测量根管长度的准确性。方法收集40颗单根管下颌前磨牙,首先借助K锉测定实际根管长度,然后再分别使用Raypex 5和Elements Diagnostic 2种根尖定位仪测定根管长度,得到电测长度与实际长度的差值,对结果进行分析比较。结果 Raypex 5根管长度测量的准确率是87.5%,Elements Diagnostic 92.5%,两者准确率差异无统计学意义(P>0.05)。结论临床使用2种根尖定位仪对根管长度的确定都是较为精确和有效的。     

根尖定位仪测定根管工作长度的应用评价

根管治疗术是治疗牙髓病和根尖周病首选和有效的方法 ,准确地测定根管工作长度是根管治疗术成功的关键。笔者通过使用根尖定位仪RootZX测定根管工作长度 ,对其测定根管工作长度的准确性进行分析。材料和方法1 病例选择诊断为急慢性牙髓炎、根尖周炎和外伤牙折等需行根管治疗术患者 16 0例 ,年龄 13～ 72岁 ,192颗患牙 ,共 32 1个根管 ,其中前牙 110颗 110个根管 ,双尖牙 5 2颗 85个根管 ,磨牙 4 0颗 12 6个根管。所有病例牙体缺损均位于龈上 1mm以上。2 仪器及器械根尖定位仪RootZX(日本Morita公司 ) ,MANIK型根管锉。3 测量方法按常…     

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。     

2种根尖定位仪准确性的临床评价

目的 评价2种根尖定位仪的准确性。方法 选取因修复需要根管治疗的上前牙,共40个根管。要求未罹患任何牙体牙髓疾病,具有正常牙髓活力。局麻下常规开髓,分别选用第三代电子根管测量仪ROOT ZX及第四代产品VDW Raypex5测量工作长度。随后插针进行牙CT拍摄,从牙CT影像中得到根尖孔位置,测得工作长度,并以此作为金标准。引入经典流行病学中对诊断试验评价的方法,采用SPSS13.0软件,根据测得数据绘制受试者工作特性曲线（receiver operator characteristic curve,简称ROC曲线）,按曲线下面积,比较几种诊断试验的诊断效率。结果 ROOT ZX和VDW Raypex5的准确率分别为87.5%和92.5%。ROC曲线下面积ROOT ZX为0.489,VDW Raypex5为0.505。结论 ROOT ZX和VDW两代产品都对根管工作长度的测量结果准确、安全、可靠。ROC曲线是一种全面、准确评价诊断试验有效的方法。     

根尖定位仪在不同指示点测量特点的体外研究

目的研究2种多频根尖定位仪在不同指示点的测量特点。方法截除75颗单根管前磨牙牙冠,GG钻扩大根管冠、中1／3。计算ProPexⅡ和JustyII在显示0和0．5指示点时,定位锉尖与解剖根尖孔间的距离。结果采用Mann-WhitneyU检验分析。结果指示点为0时,ProPexⅡ和JustyⅡ测量值间差异无统计学意义（P〉0．05）,中间值分别为0．39mm和0．37mm。指示点为0．5时,ProPexⅡ和JustyⅡ测量差异有统计学意义（P〈0．05）,测量中间值分别为0．56mm和0．69mm。同一定位仪在不同参考点下测量值间差异有统计学意义（P〈0．01）。结论本研究条件下,指示点由0变化到0．5时,2种根尖定位仪定位锉尖均逐渐远离解剖根尖孔。指示点0时2种根尖定位仪定位效果相似。指示点0．5时,ProPexⅡ比JustyII定位更接近解剖根尖孔。     

Ex vivo comparison of two electronic apex locators with different scales and frequencies

AIM: To compare ex vivo the accuracy of two impedance quotient apex locators with different scales and frequencies of the measuring circuit. METHODOLOGY: In each root of 193 extracted human teeth, electronic working length determination (ELD) was carried out with a newly constructed measuring unit. In all cases, ELD was performed using the apex locators Justy II (Hager & Werken, Duisburg, Germany) and Raypex (VDW, Munich, Germany) on the scale points (sp) 0/0.5/1 of each device. A Miller Needle reaching working length was fixed with composite. The corresponding sp and the differences to the other sp were recorded. After histological preparation of the apical region, the teeth were examined under a light microscope. The distances of the Miller Needle tips to the target intervals 'minor foramen-major foramen' and 'apical canal constriction' (apical constriction) were determined for each sp for both devices. The data were statistically analysed by a chi-square test. RESULTS: Precise determination of the target interval 'minor foramen-major foramen' was successful with Raypex 4 in 94.8% (sp 1), 90.7% (sp 0.5) and 72.5% (sp 0) of cases and with Justy II in 59.6% (sp 1), 92.2% (sp 0.5) and 68% (sp 0) of cases. No measurement carried out by Raypex 4 and by Justy II on sp 1 was beyond the major apical foramen. However, on sp 0.5, there were eight measurements for Raypex 4 and four measurements for Justy II beyond the major apical foramen. Overinstrumentation was also recorded for sp 0 in 49 specimens (Raypex 4) and 59 specimens (JustyII). The major apical constriction was met exactly by Raypex 4 in 50.7% (sp 1), 14% (sp 0.5) and 5.2% (sp 0) of cases and by Justy II in 32.1% (sp 1), 23.8% (sp 0.5) and 4.1% (sp 0) of cases. The differences between the determination made with the sp suggested by the manufacturers for Raypex 4 (sp 1) and Justy II (sp 0.5) were not significant (P > 0.05) for the target interval 'minor foramen-major foramen' and significant (P 相似文献   

Electronic working length determination in primary teeth by ProPex and Digital Signal Processing

The purpose of this study was to evaluate the accuracy of electronic apex locators Digital Signal Processing (DSP) and ProPex, for root canal length determination in primary teeth. Fifteen primary molars (a total of 34 root canals) were divided into two groups: Group I - without physiological resorption (n = 16); and Group II - with physiological resorption (n = 18). The length of each canal was measured by introducing a file until its tip was visible and then it was retracted 1 mm. For electronic measurement, the devices were set to 1 mm short of the apical resorption. The data were analysed statistically using the intraclass correlation coefficient (ICC). Results showed that the ICC was high for both electronic apex locators in all situations - with (ICC: DSP = 0.82 and Propex = 0.89) or without resorption (ICC: DSP = 0.92 and Propex = 0.90). Both apex locators were extremely accurate in determining the working length in primary teeth, both with or without physiological resorption.     

The accuracy of electronic working length determination

AIM: To determine in vivo the accuracy of two impedance quotient apex locators under clinical conditions. METHODOLOGY: Electronic working length determination was carried out before extraction in 79 human teeth with 93 root canals. In 51 root canals, the determination was performed using the apex locator Justy II(R) (Hager & Werken, Duisburg, Germany); in 42 canals, the apex locator Endy 5000(R) (Loser, Leverkusen, Germany) was used. A root canal instrument was fixed at working length with composite material prior to extraction followed by the exposure of a radiograph. After histological preparation of the apical region, the teeth were examined under a light microscope. The distance of the file tips to the target intervals 'minor foramen - major foramen' and 'apical canal constriction' was determined. These values were compared with the calculated working lengths, determined by radiographic assessment. The data were statistically analysed by a paired t-test. RESULTS: For both apex locators and both target intervals, no significant differences between the electronic and radiographical assessments were recorded. The probability of determining the area between minor and major foramen was 82.4% for Justy II and 81% for Endy 5000. However, accurate determination of the apical constriction was only successful in 51% (Justy II) and 64.3% (Endy 5000) of canals. Variation of the inaccurate measurements was higher for Endy 5000 than for Justy II. CONCLUSIONS: Under clinical conditions, it is possible to determine the region between the minor and major apical foramen with electronic length measuring devices (ELD). However, use of these devices does not result in precise determination of the apical constriction.     

Determining the apical terminus of root-end resected teeth using three modern apex locators: a comparative ex vivo study

AIM: To assess ex vivo the accuracy of various electronic apex locators in locating the apical terminus of root-end resected teeth. METHODOLOGY: Ninety extracted human posterior teeth (182 root canals) were prepared to a minimum size of 40 and filled with gutta-percha and sealer. After resection of the apical 3 mm of the root, the root canal filling was removed using HERO rotary instruments. The size of the root canal at the apical terminus after removal of the filling ranged from size 50 to 90. The root canal length to the apical terminus was determined using 3 apex locators (Root ZX, Raypex4 and Apex Pointer). A new mounting model that utilized a micrometer was used to perform the measurements and to visually determine the actual position of the apical terminus. The frequency of locating the apical terminus and the corresponding 95% confidence interval (CI) were calculated. Additionally, the coefficient of repeatability of each apex locator and the limits of inter-operator agreement were determined. RESULTS: All apex locators showed an acceptable repeatability (0.02-0.03 mm coefficient of repeatability) and narrow limits of inter-operator agreement (+0.07 and -0.07 mm). The accuracy of determining the apical terminus within 1 mm in the root canal was as follows: Root ZX 90% (164/182 root-canals) [95%CI: 86-94%], Raypex4 74% (135/182 root-canals) [95%CI: 68-80%], and Apex Pointer 71% (129/182 root canals) [95%CI: 65-77%]. No over-instrumentation resulted when the Root ZX device was used. In contrast, using the Raypex4 or the Apex Pointer device resulted in over-instrumentation in 8 of 182 root canals (4%). CONCLUSIONS: Under the conditions of this study all three apex locators were able to detect the apical terminus of root-end resected teeth with an acceptable range. The Root ZX device was the most accurate without over-instrumentation of the root canals.     

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目的    比较Raypex5根尖定位仪两种测量法测定牙齿根管工作长度的准确性。方法    选择2009年7月至2009年11月北京口腔医院收治的慢性根尖周炎患者拔除的离体牙40颗为根尖周破坏组;以正畸拔除的单直根管且根尖孔发育完全的健康牙40颗作为根尖周完整组。采用离体牙实测法测量各离体牙根管长度的理论实际值;分别以Raypex5根尖定位仪显示屏上绿格位置测得长度（A法）和红格位置测得长度减去0.5 mm（B法） 作为工作长度。测量值与理论实际值的差值为IF值,比较两种测量法IF值的频数分布。结果    根尖完整组中,A、B两种测量法的准确率分别是85%和87.5%,差异无统计学意义（χ2 = 0.11,P > 0.05）;根尖破坏组中,B法的准确率72.5%,高于A法的50%,差异有统计学意义（χ2 = 4.27,P < 0.05）。A法在根尖完整组中的准确率85%,高于根尖破坏组的50%,差异有统计学意义（χ2 = 11.17,P < 0.01）;B法在根尖完整组中的准确率87.5%,高于根尖破坏组的72.5%,差异无统计学意义（χ2 = 2.8,P > 0.05）。结论    Raypex5根尖定位仪能够准确测量根管长度,其数码条到达红格后测得的长度减去0.5 mm更接近根管真实工作长度。