Incidence of dentinal crack formation during root canal preparation with two NiTi instruments activated by adaptive motion and continuous rotation: an in vitro study

Year 2019, , 757 - 762, 04.09.2019

Erhan Erkan , Keziban Olcay , Tan Fırat Eyüboğlu Mustafa Gündoğar

https://doi.org/10.18621/eurj.417982

Abstract

Objectives:
The
aim of this study was to evaluate dentin crack incidence after root canal instrumentation
using ProTaper Next (PT Next; Dentsply Maillefer, Ballaigues, Switzerland) and
Twisted File Adaptive (TF Adaptive; Sybron Endo, Orange, California, USA) at
different kinematics.

Methods: Sixty
human extracted premolar teeth were selected and divided into 4 main groups.
Group 1: PT Next with continuous rotation (n = 15); Group 2: PT Next with
adaptive motion (n = 15); Group 3: TF Adaptive with continuous rotation (n = 15);
Group 4: TF Adaptive with adaptive motion (n = 15). Fifteen unprepared teeth
were used as control group. Crowns of the teeth were removed and roots were
sectioned at 3, 6, and 9 mm from the apex using a diamond saw. Finally root
dentin pieces were evaluated under stereomicroscope at x25 magnification.
Digital images were evaluated by 2 researchers.

Results: No
cracks were observed in the control group. In groups 2 and 4 no fracture was
observed at the level of 9 mm and similarly in group 4 at 6 mm level. Group 3
showed a significantly higher dentin crack formation followed by Group 1, 2, 4
and control group respectively (p <
0.039). There was no significant difference between groups at 6 mm and 9 mm
levels (p = 0.497) except for only 3 mm
level (p < 0.035).

Conclusions: It
was concluded, both adaptive motion and continuous rotationpromoted dentinal
defect. Adaptive motion produced less dentinal defects all dentin levels but
there was no significant difference.

Keywords

Dentinal crack, root canal preparation, protaper next, twisted file adaptive, nickel-titanium instruments, adaptive motion, continuous rotation

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