Abstract
Introduction
This laboratory-based study aimed to investigate the quantitative amount of apically
extruded debris from severely curved root canals and the preparation time for the
novel rotary system TruNatomy (TN; Dentsply Sirona, Charlotte, NC) compared with Reciproc
Blue (RCB; VDW Dental, Munich, Germany), HyFlex (HyFlex Controlled Memory [HCM; Coltene/Whaledent,
Altstatten, Switzerland] and HyFlex EDM [HEDM, Coltene/Whaledent]), and ProTaper Next
(PTN; Dentsply Maillefer, Ballaigues, Switzerland) rotary systems.
Methods
One hundred mandibular molar human teeth with severe curvature of the mesiobuccal
canal (25°–45°) were included in the present study. The specimens were randomly distributed
into 5 balanced groups (n = 20): TN, RCB, HCM, PTN, and HEDM. The amount of extruded debris for each group
during instrumentation at body temperature was collected in an Eppendorf tube. After
desiccation, the mean debris weights for each group were calculated. The total preparation
time for each group was also recorded. Data were statistically analyzed using the
Kruskal-Wallis test at a significance level of P < .05.
Results
The HCM and HEDM groups extruded a significantly higher amount of debris than the
other tested groups (P < .001). TN extruded the least amount of debris, but it was not significantly different
compared with the RCB and PTN groups (P > .05). In terms of preparation time, the TN group did not show any significant difference
compared with the other groups.
Conclusions
All instrumentation systems extruded debris. TN was among the groups that produced
the lowest amount of apically extruded debris that is clinically acceptable. The amount
of apically extruded debris using the TN system was equal to 2 popular systems and
statistically significantly less than 2 other popular systems studied.
Key Words
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Article info
Publication history
Published online: March 15, 2021
Identification
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© 2021 American Association of Endodontists.
