AIM The study was designed to quantitatively evaluate the quality of root canal preparation and root canal obturation in canals treated with either rotary or self adjusting files, using three-dimensional micro-computed tomographic (CT) analysis. METHODOLOGY Pair-matched root canals were instrumented with either rotary nickel-titanium files or self-adjusting files following the manufacturers' ...

Background:One of the main reasons for extraction of endodontically treated teeth is vertical root fracture (VRF). Some factors such as root canal treatment are involved in vertical root fracture because of their potential to weaken the tooth structure. Therefore, this study aimed to investigate the effect of combining different obturation materials and rotary systems on the fr...

introduction: we aimed to compare apical canal transportation of extracted teeth and two types of simulated resin blocks. materials and methods: mesiobuccal root of extracted maxillary molars, high hardness simulated resin blocks (knoop hardness=40) and low hardness simulated resin blocks (knoop hardness=22) were prepared with k-files using step-back technique (n=15 canals in each group). doubl...

To better assess the efficacy of mechanical preparation of root canals, transparent specimens of 250 extracted maxillary canines were investigated for canal configuration, thickness and curvature of the root canal, condition of any accessory canals, and location of the apical foramen. Fewer than 40% of the specimens showed accessory canals that were mechanically impossible to clean. The majorit...

INTRODUCTION The purpose of this study was to examine the lifespan of one nickel-titanium (NiTi) rotary file when used in reciprocating motion and to compare the time required for its preparation of a curved root canal using both reciprocating and continuous motion. METHODS One hundred twenty curved canals from 60 extracted maxillary and mandibular molars were selected for measuring the mean ...

The purpose of this study was to evaluate the clinical accuracy of femoral canal preparation using postoperative reconstructed computed tomography (CT) images of 75 consecutive total hip arthroplasties performed with a two-pin-based ROBODOC system. Intraoperatively, the robot milled the femoral canal according to the preoperative planning performed with preoperative CT data and the ROBODOC work...

Aims During biomechanical preparation of the root canal system, the cutting action of instruments on dentine result in the formation of hard-tissue debris, which can be packed in some areas of the root canal system, mainly in anatomical variations as isthmus, branches and flattening (1, 2). Accumulated hard-tissue debris in the root canal system may compromise thorough disinfection and filling ...

Objective: This study was conducted to evaluate the effect of apical terminus location of the root canal preparation on apical transportation in vitro. Materials and Method: Thirty extracted human maxillary first molars with mature apices were used. The mesiobuccal root of each tooth was mounted in a square piece of silicone leaving foramen on top. The specimens were randomly divided into 3 gro...