Vertical Root Fracture initiation in curved roots after root canal preparation: a dentinal micro-crack analysis with LED transillumination
2017
Background: One of the causative factors of root defects is the increased friction produced by rotary instrumentation. A high canal curvature may increase stress, making the tooth more susceptible to dentinal cracks. The purpose
of this study was to evaluate dentinal micro-crack formation with the ProTaper NEXT and ProTaper Universal
systems using LED transillumination, and to analyze the micro-crack generated at the point of maximum canal
curvature.
Material and Methods: 60 human mandibular premolars with curvatures between 30–49° and radii between 2–4
mm were used. The root canals were instrumented using the Protaper Universal® and Protaper NEXT® systems,
with the aid of the Proglider® system. The obtained samples were sectioned transversely before subsequent analysis with LED transillumination at 2 mm and 8 mm from the apex and at the point of maximum canal curvature.
Defects were scored: 0 for no defects; and 1 for micro-cracks.
Results: Root defects were not observed in the control group. The ProTaper NEXT system caused fewer defects
(16.7%) than the ProTaper Universal system (40%) (
P
<0.05). The ProTaper Universal system caused significantly
more micro-cracks at the point of maximum canal curvature than the ProTaper NEXT system (
P
<0.05).
Conclusions: Rotary instrumentation systems often generate root defects, but the ProTaper NEXT system generated
fewer dentinal defects than the ProTaper Universal system. A higher prevalence of defects was found at the point
of maximum curvature in the ProTaper Universal group.
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