• Restorative Dentistry and Endodontics
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• 제41권1호
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• pp.6-11
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• 2016

Objectives: The purpose of this in vitro study was to evaluate the accuracy of working length (WL) determination of four electronic apex locators (EALs), namely, Root ZX (RZX), Elements diagnostic unit and apex locator (ELE), SybronEndo Mini Apex locator (MINI) and Propex pixi (PIXI) using Stainless steel (SS) and nickel-titanium (NiTi) hand files. The null hypothesis was that there was no difference between canal length determination by SS and NiTi files of 4 EALs. Materials and Methods: Sixty extracted, single rooted human teeth were decoronated and the canal orifice flared. The actual length (AL) was assessed visually, and the teeth were embedded in an alginate model. The electronic length (EL) measurements were recorded with all four EALs using SS and NiTi files at '0.5' reading on display. The differences between the AL and EL were compared. Results: The results obtained with each EAL with SS and NiTi files were compared with AL. A paired sample t test showed that there was a statistical significant difference between EAL readings with SS and NiTi files for RZX and MINI (p < 0.05). The accuracy of RZX, ELE, MINI and PIXI within ${\pm}0.5 mm$ of AL with SS/NiTi files were 93.3%/70%, 90%/91.7%, 95%/68.3%, and 83.3%/83.3%, respectively. Conclusions: The results of this study indicate that Root ZX was statistically more accurate with NiTi files compared to SS files, while MINI was statistically more accurate with SS files compared to NiTi files. ELE and PIXI were not affected by the alloy type of the file used to determine WL.

• 구강회복응용과학지
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• 제28권2호
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• pp.139-145
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• 2012

본 연구의 목적은 근관세척제로 2.5% Sodium Hypochlorite, 2% chlorhexidine gel, 식염수를 사용하였을 때, Root ZX와 Sybron Mini의 근관장 측정의 정확도를 평가하고자 하는 것이다. 20개의 발치된 사람 치아에서 Donnelly의 gelatin technique으로 측정하였다. Digital caliper를 이용해 0.01 mm 단위까지 각 전자 근관장 측정기의 0.5와 0.0 level에서 전자 근관장을 측정하였다. 각 측정은 세척제 종류에 따라 세 번식 반복해서 측정하였다. 세 가지 세척제에서 Sybron Mini와 Root ZX의 정확도는 유의한 차이가 없었으며, 제조사의 지시 (Sybron Mini의 0.0 level과 Root ZX의 0.5 level)에서 전자 근관장 측정)에 따라 사용되었을 때 세척제에 따른 전자 근관장 측정기의 정확도는 유의한 차이가 없었다. Root ZX와 Sybron Mini의 사용 시 제조사의 지시대로 사용한다면, 근관세척제으로서 2.5% Sodium Hypochlorite, 2% chlorhexidine gel, 식염수의 사용은 근관장 측정의 정확도에 영향을 미치지 않는다.