Evaluation of remaining dentin thickness following use of three different rotary nickel-titanium retreatment files: A cone-beam computed tomography study.
Aim
The aim of the study is to measure the amount of remaining dentin thickness (RDT) following retreatment using three different rotary nickel-titanium (NiTi) systems.


Methodology
Mesiobuccal roots of 45 extracted maxillary first molars were prepared up to F2 ProTaper File and obturated. After cone-beam computed tomography (CBCT) imaging, to evaluate the obturation, the samples were randomly assigned to three retreatment groups (n = 15). Group I was retreated with ProTaper Universal retreatment kit, Group II and III with MTWO and D-Race retreatment files, respectively. Postoperatively, all samples were subjected to CBCT imaging and evaluated with AutoCAD software (AutoDesk, Inc.) Mill Valley, California, U.S. to calculate the RDT. Data were statistically analyzed using one-way ANOVA and Tukey's post hoc tests, and the level of significance was set at P = 0.05.


Results
The amount of RDT was significantly more in D-Race and MTWO groups when compared to ProTaper group.


Conclusion
D-Race and MTWO instruments were associated with significantly more RDT than ProTaper.
['Kulkarni|Nishita Rajeev|NR|', 'Kamat|Sharad Basavraj|SB|', 'Hugar|Santosh Irappa|SI|', 'Nanjannawar|Girish Shankar|GS|', 'Patil|Pranav Devendra|PD|']
remaining dentin thickness retreatment Cone-beam computed tomography maxillary first molar