Publications by authors named "Reza Arbab Chirani"
Objectives: This study compared the cyclic fatigue resistance of One Curve (C wire) and F6 Skytaper (conventional austenite nickel-titanium [NiTi]), and 2 instruments with thermo-mechanically treated NiTi: Protaper Next X2 (M wire) and Hyflex CM (CM wire).
Materials And Methods: Ten new instruments of each group (size: 0.25 mm, 6% taper in the 3 mm tip region) were tested using a rotary bending machine with a 60° curvature angle and a 5 mm curvature radius, at room temperature.
Purpose: A questionnaire survey was recently undertaken among French dental students (FDSs) to investigate their practices, knowledge and opinions in various domains of minimal intervention (MI) in cariology. The present work focuses on management of deep carious lesions (DCLs).
Materials And Methods: The questionnaire was administered (Spring 2018) to all the fifth-year students of the 16 French dental schools.
Article Synopsis
- The study aimed to assess French dental students’ knowledge and practices related to minimal intervention techniques in treating dental caries, focusing on restorative management.
- A survey conducted in spring 2018 among fifth-year dental students showed a high response rate, revealing that most students favored invasive treatments over non-invasive options, indicating a lack of awareness of current minimal intervention guidelines.
- The findings emphasized the need for improved education in dental schools regarding non-invasive strategies and the importance of distinguishing between different stages of carious lesions to reduce unnecessary procedures.
Article Synopsis
- A national questionnaire study assessed the knowledge and opinions of French dental students about minimal intervention (MI) in dentistry, particularly focusing on caries risk assessment (CRA) and dental sealants (DSs).
- The study found that while a majority of students recognize the importance of MI and CRA, many don't consistently apply these concepts in their clinical practice, with less than half making treatment decisions based on individual risk levels.
- It highlights the need for improved and standardized education in cariology to ensure dental students are well-equipped with the latest practices and recommendations in preventive dentistry.
The aim of this study was to use high-resolution micro-CT to evaluate the effects of three Ni-Ti rotary endodontic instruments, Mtwo® (VDW, München, Germany), ProTaper® (Dentsply-Maillefer, Ballaigues, Switzerland) and Revo-S™ (MicroMega, Besançon, France), on canal transportation and centring ratio. Fifty-four mesial roots of extracted mandibular molars with an angle of curvature of 25-35° were randomly divided into three groups of eighteen. Each group was instrumented with a previously unused Ni-Ti rotary system.
View Article and Find Full Text PDFIntroduction: The purpose of this study was to evaluate and compare canal transportation of curved root canals by using 3 nickel-titanium systems: Reciproc, WaveOne, and Twisted Files Adaptive (TF).
Methods: Twenty-four extracted human mandibular molars with 2 separate mesial canals and severe angle of curvature were selected. Individual canals were divided randomly to 1 of the 3 experimental groups: Reciproc group, reciprocating instrumentation with Reciproc R25; WaveOne group, reciprocating instrumentation with the Primary WaveOne file; and TF Adaptive group, Adaptive Rotary Motion with the TF files.
Aim: The aim of this study is to evaluate the influence of final canal taper on the sealing ability of Thermafil by using microcomputed tomography (micro-CT).
Materials And Methods: Fifty-four single-rooted teeth were instrumented to apical size 40 taper 4, 6 and 8%. Teeth were divided into three groups.
Comparative analysis of torsional and bending behavior through finite-element models of 5 Ni-Ti endodontic instruments.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod
January 2011
Objectives: The objectives of this study were to compare numerically the bending and torsional mechanical behavior of 5 endodontic rotary Ni-Ti instruments with equivalent size and various designs for tapers, pitch, and cutting blades.First, the geometries of Hero (20/0.06), HeroShaper (20/0.
View Article and Find Full Text PDFAn improved model of 3-dimensional finite element analysis of mechanical behavior of endodontic instruments.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod
March 2010
Objectives: The aim of this study was to develop a numeric method to study the mechanical behavior of an endodontic instrument during different loading paths and to demonstrate the importance of the behavior model in the finite element results.
Study Design: A numeric study of an endodontic instrument was carried out. At first, the geometry was meshed with a finite element code.
Occurrence of no-function of two electronic apex locators: an in vivo study.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod
December 2009
Objectives: This in vivo study was aimed at quantifying the electronic no-function rate of 2 electronic apex locators, ApexPointer and Novapex, and evaluating whether their operation is affected by the type of applied treatment, patient's age, and the type of tooth.
Study Design: A total of 209 root canals were included in this study. For each canal, the electronic length was determined and verified by radiography.
Temporomandibular joint: a methodology of magnetic resonance imaging 3-D reconstruction.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod
June 2004
Objective: The aim of this study was to develop a new method for the 3-dimensional reconstruction of the temporomandibular joint (TMJ) images by means of magnetic resonance imaging (MRI). In a preliminary study, this modality of 3-D representation was tested to evaluate the joint motion.
Study Design: Sagittal MRI slices were obtained from a healthy subject.