预扩孔对四种电子根尖定位仪测定长度准确性的影响。
Influence of preflaring on the accuracy of length determination with four electronic apex locators.
作者信息
de Camargo Ericson Janolio, Zapata Ronald Ordinola, Medeiros Paulo Leal, Bramante Clovis Monteiro, Bernardineli Norberti, Garcia Roberto Brandão, de Moraes Ivaldo Gomes, Duarte Marco Antônio Húngaro
机构信息
Department of Endodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil.
出版信息
J Endod. 2009 Sep;35(9):1300-2. doi: 10.1016/j.joen.2009.05.030.
INTRODUCTION
The aim of this study was to compare the influence of preflaring on the accuracy of 4 electronic apex locators (EALs): Root ZX, Elements Diagnostic Unit and Apex Locator, Mini Apex Locator, and Apex DSP.
METHODS
Forty extracted teeth were preflared by using S1 and SX ProTaper instruments. The working length was established by reducing 1mm from the total length (TL). The ability of the EALs to detect precise (-1mm from TL) and acceptable (-1+/-0.5 mm from TL) measurements in unflared and preflared canals was determined.
RESULTS
The precise and acceptable (P/A) readings in unflared canals for Root ZX, Elements Diagnostic Unit and Apex Locator, Mini Apex, and Apex DSP were 50%/97.5%, 47.5%/95%, 50%/97.5%, and 45%/ 67.5%, respectively. For preflared canals, the readings were 75%/97.5%, 55%/95%, 75%/97.5%, and 60%/87.5%, respectively. For precise criteria, the preflared procedure increased the percentage of accurate electronic readings for the Root ZX and the Mini Apex Locator (P < .05). For acceptable criteria, no differences were found among Root ZX, Elements Diagnostic Unit and Apex Locator, and Mini Apex Locator (P > .05). Fisher test indicated the lower accuracy for Apex DSP (P < .05).
CONCLUSIONS
The Root ZX and the Mini Apex Locator devices increased significantly the precision to determine the real working length after the preflaring procedure. All the EALs showed an acceptable determination of the working length between the ranges of+/-0.5mm except for the Apex DSP device, which had the lowest accuracy.
引言
本研究的目的是比较预扩锉对4种电子根尖定位仪（EALs）准确性的影响，这4种仪器分别是Root ZX、Elements诊断仪、Mini根尖定位仪和Apex DSP。
方法
使用S1和SX ProTaper器械对40颗离体牙进行预扩锉。工作长度通过从总长度（TL）减少1mm来确定。测定EALs在未扩锉和预扩锉根管中检测精确测量值（距TL -1mm）和可接受测量值（距TL -1±0.5mm）的能力。
结果
Root ZX、Elements诊断仪、Mini根尖定位仪和Apex DSP在未扩锉根管中的精确和可接受（P/A）读数分别为50%/97.5%、47.5%/95%、50%/97.5%和45%/67.5%。对于预扩锉根管，读数分别为75%/97.5%、55%/95%、75%/97.5%和60%/87.5%。对于精确标准，预扩锉操作增加了Root ZX和Mini根尖定位仪精确电子读数的百分比（P <.05）。对于可接受标准，Root ZX、Elements诊断仪、Mini根尖定位仪之间未发现差异（P >.05）。Fisher检验表明Apex DSP的准确性较低（P <.05）。
结论
Root ZX和Mini根尖定位仪在预扩锉操作后显著提高了确定实际工作长度的精度。除准确性最低的Apex DSP外，所有EALs在±0.5mm范围内对工作长度的测定均可接受。
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