A first step towards the detection of damage processes in endodontic Ni-Ti alloy files, using acoustic emission.

Despite major instrumental developments over the last decade, endodontic files are still not infallible. It is well known that NiTi rotary files can break without any visible sign of deformation. Instrument breakage under combined flexion-torsion loading is still common in clinical practice.

Influence of endodontic motors on the behaviour of root canal shaping instruments: an in vitro comparative study.

Aims: The endodontic literature reports a lot of comparative study on endodontic instruments, concerning as well their geometry, instrumental dynamics, material, mechanical behavior or heat treatment. However, to our knowledge, no study has focused on the influence of endodontic motors on the shaping abilities of endodontic instruments. Thus, the aim of this study was to analyze the influence of the endodontic motors on root canal shaping instruments.

Distinguishing skill levels with haptic simulation in restorative dentistry: Myth or reality?

Introduction: This study aims to validate that haptic simulator assistance could distinguish skill levels with haptic simulation in restorative dentistry.

Materials And Methods: This work was carried out with 93 first-year, 87 third-year and 44 fifth-year dental students. The promotions of first- and fifth-year dental students made one session to represent the negative and the positive controls, respectively.

Experimental Analysis of the Influence of Heat Treatments on the Flexibility of NiTi Alloy for Endodontic Instruments Manufacturing.

The flexibility of NiTi based endodontic files is improved by heat treatment, leading to lower risk of failure, ledges, and canal transportation during the preparation of curved root canals. The aim of this study is to investigate and clearly highlight the influence of every parameter of heat treatment on the flexibility of NiTi wires and thus of endodontic instruments. A full factorial Design of Experiment (DoE) and a designed bending-torsion bench following the ISO 3630-1 standard were used for this investigation.

Study of the use in autonomy of intraoral scanning systems to optimise dental students' performances in fixed prosthodontics practical learning in second year.

Aim: The purpose of this study was to evaluate if the use of intraoral scanner analysis could help students to optimise their performance and their self-assessment abilities in prosthetic preparation without the teacher's assistance in the preclinical course.

Materials And Methods: Ninety-five second-year dental students were randomly divided into three groups: Control group (C), CeRec group (CR) and PrepCheck group (PC). Group C only use silicon keys to control the preparation thickness.

Virtual aids and students' performance with haptic simulation in implantology.

Objetives: This study aims to validate that haptic simulator assistance could improve drilling ability in implantology and that the repetition of training session could highlight a learning curve.

Methods: This work was carried out with 88 first-year dental students. After randomization, students were divided into two groups.

Contribution of Haptic Simulation to Analogic Training Environment in Restorative Dentistry.

The aim of this study was to evaluate the contribution of virtual reality to the conventional analogic training environment and show the complementarity of conventional techniques and virtual reality in the learning of dental students. All 88 first-year dental students at a dental school in France in early 2019 were randomly assigned to one of two groups: group 1 (n = 45) was assigned to cavity preparations on a haptic simulator (Virteasy) and group 2 (n = 43) was assigned to conventional practical work on plastic analogue teeth (Kavo). Following three training sessions, the students in group 1 took a final exam on the same plastic analogue teeth exercise.

Methodological Approach to the Endodontic Treatment of First Premolars with Three Root Canals: Two Case Reports.

Aim: The aim of this article was to promote a methodology in the endodontic management of complex premolars with multiple root canals Background: The success of endodontic treatment depends on a meticulous clinical and radiographic analysis, the creation of a suitable access cavity and chemical and mechanical preparation, followed by three-dimensional filling of the entire root canal system. Consequently, it is essential to look for the presence of additional root canals to prevent endodontic treatment failure Case description: Two cases are presented. The first case concerned a 50-year-old male patient of North African origin who consulted in the context of a global prosthetic restoration including endodontic treatment of the maxillary left first premolar (tooth no.

Dynamic thermo-mechanical properties of various flowable resin composites.

Background: This study compared the storage modulus (E'), the loss modulus (E'') and the loss tangent (tan δ) of various flowable resin composites.

Material And Methods: Grandio Flow (GRF), GrandioSo Heavy Flow (GHF), Filtek Supreme XTE (XTE) and Filtek Bulk Fill (BUL) flowable resins and Clinpro Sealant (CLI) ultra-flowable pit and fissure sealant resin were used. 25 samples were tested using a dynamical mechanical thermal analysis system in bending mode.

Antimicrobial applications of copper.

Copper has long been known to have antimicrobial activity and is used in drinking water treatment and transportation. It has been recognized by the American Environmental Protection Agency as the first metallic antimicrobial agent in 2008. With ongoing waterborne hospital-acquired infections and antibiotic resistance, research on copper as an antimicrobial agent is again very attractive.

Lower lateral crural turnover flap in open rhinoplasty.

Background: Lower lateral crural deformities are common problems in rhinoplasty. The shape and position of the lower lateral crura directly influence the alar contour and external valve function. This study reviews an extensive experience with the lower lateral crural turnover flap, which represents a versatile and reproducible technique for correction of lower lateral crural deformities and improvement of external valve function.

Dorsal augmentation with autogenous rib cartilage.

Reconstruction of the nasal osseocartilaginous framework is the foundation of successful primary and secondary rhinoplasty. When adequate septal cartilage is unavailable, the rib provides the most abundant source of cartilage for graft fabrication and is the most reliable when structural support is needed. We present the senior author's (J.

Harvesting rib cartilage grafts for secondary rhinoplasty.

Background: Reconstruction of the nasal osseocartilaginous framework is the foundation of successful secondary rhinoplasty.

Methods: Achieving this often requires large quantities of cartilage to correct both contour deformities and functional problems caused by previous procedures. Satisfactory and consistent long-term results rely on using grafts with low resorption rates and sufficient strength to offer adequate support.

Serum cotinine concentration and wound complications in head and neck reconstruction.

Background: The authors examined whether the preoperative serum concentrations of cotinine accurately predict the risk of complications in patients undergoing flap reconstruction of head and neck cancer defects.

Methods: Patients with incident stage III or IV squamous cell carcinoma of the head and neck undergoing resection with pedicled or free flap reconstruction were selected from an existing database of 500 patients with squamous cell carcinoma of the head and neck who participated in a prospective epidemiologic study and were reviewed retrospectively. Preoperative serum cotinine concentrations were determined using a competitive microplate immunoassay.

Isolated cervical esophageal reconstruction for rare esophageal tumors.

Background: Isolated defects in the cervical esophagus in patients who have not undergone total laryngectomy are uncommon. We report 2 cases of rare esophageal tumors requiring reconstruction of the cervical esophagus after tumor resection.

Methods And Results: The patients were a 51-year-old woman with an esophageal granular cell tumor and a 54-year-old woman with an esophageal schwannoma.