ABSTRACT Objective: The purpose of the present in vitro study was to evaluate efficiency three different instruments root canals artificial primary molars as well quality fillings. Methods: Sixty were divided into groups 20 teeth. Each group submitted a technique: Group 1 - conventional manual technique using Kerr files; 2 with nickel-titanium 3 NiTi rotary technique. filled calcium hydroxide p...

INTRODUCTION To improve the fracture resistance of nickel-titanium (NiTi) files, manufacturers have introduced new alloys and developed new manufacturing processes for the fabrication of NiTi files. This study aimed to examine the phase transformation behavior and microstructure of NiTi instruments from a novel controlled memory NiTi wire (CM wire). METHODS Instruments of EndoSequence (ES), P...

The aim of this study was to assess cyclic fatigue resistance in rotary nickel-titanium instruments after simulated clinical use in curved root canals (40-degree, 5-mm radius curve). Thirty-six RaCe rotary NiTi files, size #5, taper 0.04, were divided into 3 groups: Groups A, B and C with one, three and five cycles of use, respectively. Time to failure was recorded with a stopwatch in seconds a...

OBJECTIVES To comparatively evaluate the preparation of oval root canals with a rotary or an oscillating system. STUDY DESIGN The middle and coronal parts of 55 extracted permanent teeth with oval canals were prepared using FlexMaster (FM) rotary NiTi instruments and EndoEze AET (EE) stainless steel oscillating instruments. Pre- and postoperative images of cross-sections were superimposed to ...

Aim and objective The aim of this study was to evaluate compare the cutting efficacy two different nickel titanium rotary instruments by a novel methodology: operative torque (torque time needed progress toward apex). Materials methods Ten fresh extracted upper first premolars with canals were instrumented KaVo (Biberach, Germany) 1:1 handpiece at 300 rpm maximum set 2 N. One canal ProGlider Ni...

introduction: adequate root canal seal following retreatment is essential for a successful outcome. resilon/epiphany (r/e) obturation system has been introduced as a substitute for conventional gutta-percha/sealer method. this in vitro study compared the amount of apical microleakage of r/e with gutta-percha/ah26 (gp/ah26) sealer as secondary root canal filling following retreatment in human te...

since the introduction of engine-driven nickel-titanium (niti) instruments, attempts have been made to minimize or eliminate their inherent defects, increase their surface hardness/flexibility and also improve their resistance to cyclic fatigue and cutting efficiency. the various strategies of enhancing instrument surface include ion implantation, thermal nitridation, cryogenic treatment and el...

AIM To compare using scanning electron microscopy (SEM) root canal walls following instrumentation in vitro with two different rotary NiTi instruments. The hypothesis was that no difference should be observable between the experimental groups in terms of debris on canal walls and surface morphology. METHODOLOGY Twenty-four single-rooted human teeth were selected. Two types of NiTi instruments...