Assessment of apical transportation caused by nickel–titanium rotary systems with full rotation and reciprocating movements using extracted teeth and resin blocks with simulated root canals: A comparative study

Abstract

In the current study, there was no significant difference in apical transportation between natural teeth prepared using WaveOne and those prepared using ProTaper Next. However, significant differences were observed between the two systems with resin blocks. These findings indicate that the use of resin blocks is not an accurate method for apical transportation evaluation.

A new method for assessment of nickel-titanium endodontic instrument surface roughness using field emission scanning electronic microscope

“…One other disadvantage of the resin block was the material could be melt when subject to the heat resulted from the root canal preparation and the material could accumulate in flutes of the instrument and this could cause the tip of the instrument be stuck in the root canal and lead to the fracture of instrument [13]. For some certain purposes, the resin Different superscript letters indicated statistically significant differences at 5% level blocks seemed unreliable, such as in cutting efficiency or apical transportation evaluation [2,25]. Creating and maintaining a smooth, reproducible, and secured glide path was an important characteristic of proper root canal preparation [26].…”

“…One other disadvantage of the resin block was the material could be melt when subject to the heat resulted from the root canal preparation and the material could accumulate in flutes of the instrument and this could cause the tip of the instrument be stuck in the root canal and lead to the fracture of instrument [ 13 ]. For some certain purposes, the resin blocks seemed unreliable, such as in cutting efficiency or apical transportation evaluation [ 2 , 25 ].…”

Peer Review #3 of "A comparative study of root canal shaping using protaper universal and protaper next rotary files in preclinical dental education (v0.1)"

“…Some of the reasons for these procedural errors are the instrument type and dimension, the type of alloy and the canal curve of before the instrumentation (Parashos & Messer, 2006;Lambrianidis, 2009). Further, the test material in which the instrumentation is carried out may also affect the test results (Alrahabi & Zafar, 2018). In our study, PTN (25.64º) maintained original canal curvature better than PTU (24.03º) (P˂0.000).…”

“…The alloy structure and cross-sectional shape of the PTU system's F1 and F2 instruments will result in a hardened instrument that can cause more ledges to occur than arise in PTN. Furthermore, Alrahabi & Zafar (2018) considered contributing to the snake-like, swaggering movements of the files during advancement into the root canal.…”

“…tested in extracted human teeth Alrahabi & Zafar (2018). reported that the files show different performance in the extracted human teeth and simulated resin canals.The second of the most frustrating procedural errors encountered during the instrumentation of curved root canals is the abrupt fracturing and deforming of the instruments.…”