Torsional properties of pathfinding instruments

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• 作者：Hé ; lio P.  ; Lopes LD^a ; Carlos N.  ; Elias PhD^b ; Giorgiana  ; Amaral PhD^c ; Victor T.L.  ; Vieira DDS^d ; Edson J.L.  ; Moreira PhD^d ; Marcelo  ; Mangelli PhD^e ; José ; F.  ; Siqueira Jr PhD^f ;   ; ^{siqueira@estacio.br}
• 刊名：Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
• 出版年：2011
• 出版时间：November 2011
• 年：2011
• 卷：112
• 期：5
• 页码：667-670
• 全文大小：678 K

文摘

Introduction

This study compared the torsional properties of 2 stainless steel endodontic pathfinding instruments: C-Pilot (VDW, Munich, Germany) and C⁺ files (Maillefer/Dentsply, Ballaigues, Switzerland). Stainless steel conventional K-type instruments (KCC⁺, VDW) were used as controls.

Methods

File sizes 10 were subjected to a torsional assay in clockwise rotation. The 2 parameters evaluated were maximum torque and angular deflection at failure. The fractured surfaces and the helical shafts of the fractured instruments were then examined by scanning electron microscopy (SEM).

Results

The results indicated that the angular deflection to fracture decreased in the following order: KCC⁺ > C-Pilot > C⁺. As for the maximum torque values, the results revealed the following descending order: C⁺ > KCC⁺ > C-Pilot. SEM analysis revealed that plastic deformation occurred along the helical shaft of the fractured instruments and that the fractured surfaces were of the ductile type.

Conclusions

The instruments tested showed different torsional behavior depending on the parameter evaluated. Considering that high angular deflection values may serve as a safety factor for instruments used as pathfinders, the conventional K file showed significantly better results than both C-Pilot and C⁺ files.