Dentinal crack formation during root canal preparations by the twisted file adaptive, ProTaper Next, ProTaper Universal, and WaveOne instruments

J Endod. 2015 Feb;41(2):261-4. doi: 10.1016/j.joen.2014.10.019. Epub 2014 Dec 2.


Introduction: The aim of this study was to compare the incidence of root cracks after root canal instrumentation with the TF Adaptive, WaveOne, ProTaper Next, and ProTaper Universal systems.

Methods: Seventy-five extracted mandibular central incisors with mature apices and straight root canals (<5°) were selected and kept in distilled water. The root canals were instrumented by using the ProTaper Universal, ProTaper Next, WaveOne, and TF Adaptive systems. All the roots were horizontally sectioned 3, 6, and 9 mm from the apex with a low-speed saw under water cooling. The slices were then viewed through a stereomicroscope at ×25 magnification. The samples were photographed with a camera to determine the presence of dentinal cracks.

Results: The control group had no cracks, and the difference between the control group and the experimental groups was statistically significant (P < .001). The ProTaper Next and TF Adaptive systems produced significantly less cracks than the ProTaper Universal and WaveOne systems in the apical section (3 mm) (P < .05).

Conclusions: Under the study conditions and within the limitations of this study, it can be concluded that the ProTaper Universal, ProTaper Next, WaveOne, and TF Adaptive instruments can result in dentinal cracks.

Keywords: Dentinal crack; ProTaper Next; Twisted File Adaptive.

MeSH terms

  • Dental Instruments / adverse effects
  • Dental Pulp Cavity / physiopathology
  • Dentin / physiopathology*
  • Dentin / surgery
  • Humans
  • Incisor / physiopathology*
  • Incisor / surgery
  • Root Canal Preparation / adverse effects*
  • Root Canal Preparation / instrumentation
  • Tooth Apex / physiopathology
  • Tooth Apex / surgery
  • Tooth Fractures / etiology
  • Tooth Fractures / physiopathology*
  • Tooth Root / physiopathology*
  • Tooth Root / surgery