Evaluation of Root Canal Transportation, Centering Ratio, and Remaining Dentin Thickness Associated with ProTaper Next Instruments with and without Glide Path

Quantitative transportation assessment in curved canals prepared with an off-centered rectangular design system

“…1,2,3,4,5 In contrast, the multifile PTN system seeks to improve the strength and flexibility along the active part of the file, by incorporating a progressive and regressive taper design, and using an innovative off-centered rectangular design. 6 This specific design enables an asymmetric rotary motion intended to decrease the screw-in effect, minimizing the contact area between the file and the dentinal walls. 7 This could be especially important when navigating challenging curves in the apical region, thus minimizing canal transportation.…”

Comparison of cyclic fatigue resistance and shaping ability between two single-file reciprocating systems in curved canals

“…[13] Previous studies confirmed that CBCT was useful to assess the effectiveness of rotary systems with regard to root canal geometry. [14,15] According to the results, the null hypothesis was accepted because no statistically significant differences were found between the groups in terms of cyclic fatigue, root canal transportation, centering ability, and preparation time (p>.05).…”

Filling Material Removal with Reciprocating and Rotary Systems Associated with Passive Ultrasonic Irrigation

“…These results corroborate the findings of the present study, as all the samples had remaining filling material attached to the root canal walls. NiTi instruments powered by electric motors are more efficient than manual instruments to perform filling material removal within the root canal (11,12). The use of such instruments for root canal retreatment have seen significant increase in the last few years; therefore, the authors of this study decided to compare the PTR system, which was developed exactly for this purpose, and the RS, a system that has an innovative motion kinematics and has been developed for root canal preparation (5)(6)(7)(8).…”