introduction: this study aimed to perform a rigorous sample standardization and also evaluate the preparation of mesiobuccal (mb) root canals of maxillary molars with severe curvatures using two single-file engine-driven systems (waveone with reciprocating motion and oneshape with rotary movement), using micro-computed tomography (micro-ct). methods and materials: ten mb roots with single canal...

AIMS Apical extrusion of infected debris to the periradicular tissues is one of the principal causes of postoperative pain and discomfort. Recent researches have shown that reciprocating instrumentation techniques seem to significantly increase the amount of debris extruded beyond the apex and, consequently, the risk of postoperative pain. The goal of the present study was to evaluate and compa...

The aim was to assess the presence of smear layer after canal instrumentation with two reciprocating rotary systems and a continuous motion one. Thirty canals were shaped with Reciproc, WaveOne or Mtwo systems. Smear layer was assessed following a three value scale at coronal, middle and apical levels with a scanning electron microscopy. Reciproc scores: coronal third, 20% of the cases: 0, 60%:...

Aim- To evaluate the removal of gutta percha by hand file system, rotary system and reciprocating from root canals using CBCT. Materials Method: Root 42 extracted human mandibular premolars were prepared ProTaper Universal then obturated. filling quality was confirmed on CBCT images. Specimens divided into 3 groups (n = 14) according to used for removal, group 1: H File, 2: MTwo retreatment fil...

INTRODUCTION The aim of this study was to compare different obturation techniques in terms of the percentage of gutta-percha filled areas (PGFA), sealer filled areas (PSFA), and voids in straight root canals prepared with different instruments. METHODS One hundred sixty extracted single-rooted mandibular premolars with straight canals were allocated into 10 groups (n = 16 teeth per group): A,...

Background and Aim: Debris and the smear layer that remain after root canal preparations may result in failure of root canal therapies. The aim of this study was to compare the smear layer formation and the amount of residual debris following the use of WaveOne and ProTaper rotary files in mesiobuccal root canals of upper first molars by scanning electron microscopy (SEM). Materials and Method...

introduction: the aim of this in vitro study was to evaluate the effects of establishing glide path on the centering ability and preparation time of two single-file reciprocating systems in mesial root canals of mandibular molars. methods and materials: sixty extracted mandibular molars with curvatures of 25-39 degrees and separate foramina for the mesiobuccal and mesiolingual canals, were divi...

[1] Ahmad M. Comparison between two ultrasonic units in shaping curved canals in teeth using macroradiography. cleaning effectiveness of two single-file systems in severely curved root canals of extracted teeth: Reciproc WaveOne versus Mtwo ProTaper. Fidel RAS. The ability of the Reciproc R25 instrument to reach the full root canal working length without a glide path.