Isolating design variables by assessing the impact of cross-section geometry on the mechanical performance of nickel-titanium rotary instruments: a comparative in vitro study.

Objectives: This study aimed to assess the effect of cross-section geometry on the mechanical properties of nickel-titanium (NiTi) instruments by comparing two instruments with identical tip size, taper, and thermal treatment but differing in cross-section design.

Methods: One hundred four NiTi rotary instruments, being S-shaped and triangular cross-section, manufactured with Blueish thermal treatment, were tested (n = 52 per group). Differential scanning calorimetry was employed, and the metal mass volume and cross-section area were assessed.

Evaluation of physicochemical and mechanical properties of two experimental premixed calcium silicate sealers.

The study aimed to evaluate the physicochemical properties of two experimental root canal sealers (CEO 1 and CEO 2) and compare them with Bio-C Sealer (BC) and AH Plus Bioceramic (AHPB). Setting time was evaluated following ISO 6876 Standard, radiopacity was assessed by radiographic analysis in millimeters of aluminum, and flow was also evaluated following ISO 6876. Solubility was assessed through mass loss (%) after 7 days of immersion in distilled water, hydroxyl and calcium ions release was measured by pH-meter and atomic absorption spectrophotometer, respectively.

Calcium silicate-based sealers remnants in isthmuses of mesial roots of mandibular molars: an in vitro evaluation.

Objectives: Endodontic retreatment aims to address treatment failure through the removal of root canal filling materials. This in vitro study evaluated the presence of filling material remnants in the mesial root canals, specifically focusing on the isthmuses, of mandibular molars after retreatment.

Methods: One hundred extracted mandibular molar mesial roots with isthmuses were prepared with an R25 file, obturated with one of five calcium silicate-based sealers (BioRoot RCS [Septodont], MTApex [Ultradent Products Inc.

Chemical and Biological Properties of C-Point Obturation Cones.

This study evaluated the chemical composition and subcutaneous tissue biocompatibility of C-Point, a root canal filling material, compared to ProTaper gutta-percha cones (control). Material characterization was conducted using scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS). For biocompatibility assessment, both materials were implanted subcutaneously in the dorsal connective tissue of sixteen albino rats (n = 8 per group).

Impact of the use of high-power 810-nm diode laser as monotherapy on the clinical and tomographic success of the treatment of teeth with periapical lesions: an observational clinical study.

Objectives: The aim of this study was to demonstrate the impact of a high-power 810-nm diode laser as monotherapy on the clinical and tomographic success of treating teeth with periapical lesions, through a series of 31 cases.

Methods: Teeth with apical lesions underwent endodontic treatment in which a high-power 810-nm diode laser with saline solution was used as monotherapy for disinfection. This type of therapy aimed to replace the traditional irrigation protocol with sodium hypochlorite.

Endodontic retreatment of curved canals using Reciproc, Hyflex CM and Prodesign Duo Hybrid Systems.

The aim of this ex vivo study was to evaluate the efficacy of the Reciproc, Hyflex CM, and ProDesign Duo Hybrid in the retreatment of mesial root canals with Vertucci Type 4 of mandibular molars with curvatures between 10 and 20 degrees. Forty-five mesial roots of mandibular molars were prepared up to size 25.06 Nickel-Titanium (NiTi) file and filled by the single cone technique.

Bibliometric analysis of the GentleWave system: trends, collaborations, and research gaps.

Objectives: The study aimed to conduct a bibliometric analysis of the GentleWave system (Sonendo, Inc.).

Methods: An electronic search was conducted in June 2024 using the Web of Science Collection database.

Impact of Type 2 Diabetes Mellitus on Apical Periodontitis Size, Endotoxin Levels, and Bacterial Load in Root Canals with Necrotic Pulp.

Introduction: This clinical study was conducted to describe the endodontic microbiological profile of teeth with apical periodontitis in patients with type 2 diabetes mellitus (T2DM), focusing on bacterial count and endotoxin levels found in primary infection, as well as the size of periapical lesions, determined by cone-beam computed tomography (CBCT) analysis.

Methods: Thirty-four patients were selected and divided into 2 groups: 17 with T2DM and 17 nondiabetic controls. Anamnesis, clinical examinations, and radiographic evaluations were performed.

Efficacy of Three-Dimensional Bioactive Composites in Long Bone Repair with Photobiomodulation.

Different treatments have been proposed for morphofunctional bone repair; however, they are not always efficient and have limitations. In this experimental study, we present matrix composites with a possible synergistic effect acting with scaffolds for bone growth and use of photobiomodulation (PBM) to accelerate this tissue repair. Thus, the objective was to evaluate the effect of PBM in the repair of a long bone (tibia) of rats filled with biomimetic collagen matrices with nanohydroxyapatite and heterologous fibrin biopolymer (FB).

Influence of Bioceramic Clinker particle size, radiopacifier, and liquids on their physicochemical properties.

This study evaluated the addition of calcium tungstate (CaWO4) as a radiopacifier and the manipulation with distilled water (DW) or liquid with additives (LA) on the physicochemical properties of Clinker (CL; Angelus) with different particle sizes (2 to 30 µm and <2 µm), compared to White MTA and MTA Repair HP. Initial and final setting times (ST) were evaluated according to ISO 6876:2012 and ASTM C266-03 standards. Radiopacity was assessed following ISO guidelines, and solubility was evaluated after immersion in distilled water or phosphate-buffered saline for 7 days.

Vibrational characteristics of iVAC and three ultrasonic metallic inserts: analysis by laser Doppler vibrometry.

The iVAC system combines ultrasonic activation with negative-pressure irrigation, highlighting the importance of determining its vibration characteristics. This study aimed to evaluate the oscillation characteristics of the iVAC system using laser Doppler vibrometry and to compare them with those of metallic inserts used for ultrasonic irrigation. Four ultrasonic inserts-Irrisonic, Nitisonic, Ultra X Blue, and iVAC-were attached to an ultrasonic unit, secured in a holder, and operated at a power setting of 15%.

Micro-CT Analysis of an Abrasive-expanding System of Oval Canal Debridement Capacity: Laboratory Study.

Objective: Biomechanical root canal preparation involves both mechanical instrumentation and endodontic irrigation, aiming to reduce bacterial levels to promote periradicular healing. However, complete removal of biofilm and debris, especially in complex canal morphologies, remains difficult. This study aimed to evaluate, through microcomputed tomography (micro-CT), the use of the XP-Endo Finisher and Tornado Disinfection Kit (TDK) systems during the final agitation of the irrigating solution for the final debridement of oval-shaped canals of lower incisors.

Cyclic Fatigue, Torsional Strength and Angular Deflection of Different Reciprocating Instruments: A Critical Analysis of Its Clinical Relevance.

Objective: To evaluate the cyclic fatigue fracture resistance, torsional fatigue, and angular deflection of Reciproc Blue (RB), WaveOne Gold (WOG), One Reci (OR), and Plex RC-One (RC-One) instruments for managing root curvatures in simulated canals.

Methods: A sample size calculation determined 10 samples per group (5 instruments for the cyclic fatigue test and 5 for the torsional fatigue test) for detecting significant differences. The study included 40 NiTi instruments (25 mm) from four reciprocating systems groups: RB R25, WOG 25, OR 25, and RC-One 25.

Effectiveness and safety of three NiTi systems in endodontic retreatment of MB1 and MB2 root canals: a micro-CT and CBCT combined analysis.

Objective: To evaluate the performance in endodontic retreatment and pericervical dentin preservation using ProDesign Logic (PDL), Reciproc Blue (RB), and WaveOne Gold (WOG) NiTi systems in first (MB1) and second (MB2) mesiobuccal root canals of maxillary molars, using cone-beam computed tomography (CBCT) and micro-computed tomography (micro-CT).

Materials And Methods: MB1 and MB2 canals were prepared, filled, and randomized into four groups (n = 8). MB1 were retreated using PDL up to file 40/0.

Influence of ultrasonic agitation on pH and antibiofilm activity of endodontic sealers - An study.

Background: The influence of ultrasonic agitation (UA) on the pH and antibiofilm activity of AH Plus Jet (AHP) and BioRoot RCS (BCS) sealers was evaluated. Subgroups were created based on the sealer/UA application.

Material And Methods: The pH was measured at 30 min.

Use of confocal laser scanning microscopy to evaluate the metal ion removal and destabilization of Enterococcus faecalis biofilms by EDTA and etidronic acid.

Chelating substances bind to metals, forming stable complexes, rendering these essential ions unavailable for microbial metabolism and community stability in biofilms. This action can contribute to the disinfection in endodontic treatments. Through confocal laser scanning microscopy (CLSM), this study quantified the metal ion removal by chelating agents in Enterococcus faecalis biofilms and assessed the impact on community stability.

Impact of Metallurgical Features on the Cyclic and Torsional Properties of Five Reciprocating Instruments Manufactured With Blue Thermal Treatment.

This study evaluated the metallurgical and mechanical properties of five reciprocating instruments with blue thermal treatment. A total of 200 NiTi rotary instruments (25.08 and 40.

Influence of the Filling Technique on Endodontic Retreatment in Curved Mesial Canals of Mandibular Molars: An In Vitro Study.

Introduction: The root curvature represents a challenge during the endodontic retreatment. Considering the different techniques to fill the root canals and the growing use of bioceramic sealers, this study aimed to evaluate the influence of the filling technique associated with a bioceramic sealer on the remaining filling material and the impact on the remaining dentin after the filling removal in the retreatment of curved mesial canals of mandibular molars.

Methods: Eighteen curved mesial roots of mandibular molars with Vertucci type IV canals were prepared up to instrument 35/.

Shaping ability and cyclic fatigue resistance between Genius ProFlex, ZenFlex, and TruNatomy rotary systems: an experimental study.

Objectives: The aim of this study was to investigate the efficacy of three newly introduced rotary endodontic systems: Genius ProFlex (Medidenta), TruNatomy (Dentsply Maillefer), and ZenFlex (Kerr).

Methods: Forty-five mandibular molars with root canal curvatures <5° were utilized. Micro-computed tomography scans were performed pre- and post-preparation to assess apical transportation, centralization, percentage of dentin wear, and canal volume alterations.

Accuracy of apical limit control during retreatment provided by hybrid electronic foraminal locators: A micro-CT study.

Background: This study investigated the accuracy and reliability of apical limit control in endodontic retreatment using hybrid endodontic motors.

Material And Methods: Thirty-six mesial canals of mandibular molars were accessed, and their apical foramina (AF) were standardized to 200 µm. Chemical-mechanical preparation was performed with WaveOne Gold instruments (#20/.

Shaping Ability of Rotary NiTi Systems in S-Shaped Root Canals of Mandibular Molars.

This study evaluated the shaping ability of HyFlex EDM and Rotate rotary systems in the preparation of S-Shaped mesial root canals of mandibular molars (n = 13). After root canal preparation with instruments HyFlex EDM and Rotate 0.25 and 0.

In vitro evaluation of antimicrobial photodynamic therapy with photosensitizers and calcium hydroxide on bond strength, chemical composition, and sealing of glass-fiber posts to root dentin.

Investigate the impact of antimicrobial photodynamic therapy (aPDT) using different photosensitizers (PSs) such as indocyanine green (IG), curcumin (CC), and methylene blue (MB), with or without intracanal application of calcium hydroxide (CH), on the push-out bond strength of glass-fiber posts (GFPs) to intraradicular dentin, the chemical composition of the root substrate, and the sealing of the adhesive interface across different thirds of intraradicular dentin. A total of 112 bovine teeth underwent biomechanical preparation and were divided into eight experimental groups (n = 14 each): Negative control with deionized water; positive control with deionized water + CH; IG group with indocyanine green and infrared laser; IG + CH group; CC group with curcumin and blue LED; CC + CH group; MB group with methylene blue and red laser; and MB + CH group. The push-out bond strength was measured using a universal testing machine (n = 8), and scanning electron microscopy characterized the fracture patterns.

Are ultrasonic tips associated with final irrigation protocols effective in removing biofilms in long oval canals and dentinal tubules?

Objective: This study investigated the associations among endodontic instruments, ultrasonic tips and various final irrigation protocols for removing intracanal and intratubular biofilms in long oval canals.

Methodology: One hundred mandibular premolars inoculated with Enterococcus faecalis were divided into two groups: the control group (CG: n = 10), which received no treatment; and the test groups (n = 30), which included saline (SS), sodium hypochlorite (2.5% NaOCl) and chlorhexidine (2% CHX).

Physicochemical properties of silicate tricalcium-based cement for use as pulp capping or repair material.

This study evaluated some physicochemical properties of an experimental tricalcium silicate-based cement (ETSC) indicated for use as pulp capping or endodontic repair material; Biodentine (BD) and White MTA-Angelus (MTA) cements served as comparators. Setting time, radiopacity, sorption, and solubility were determined according to ISO 6876/2012 and compressive strength according to ISO 9917-1/2019. pH and calcium ion release capacity were also assessed.

In vitro evaluation of the influence of ultrasonic activation on physicochemical properties of three endodontic repair materials.

The influence of ultrasonic activation (UA) on the physicochemical properties of setting time (n = 5), volumetric stability (n = 10), alkalizing activity/calcium ions release (pH/Ca) (n = 10) and calcium/phosphate-rich substance formation in simulated body fluid (Hank's balanced salt solution; HBSS) of three cements was evaluated: white MTA-Angelus (MTA), MTA Repair HP (MTAHP) and Biodentine (BIO). It was observed that UA influenced the setting times (min) distinctly, delaying the initial setting time of MTA (40.8/64.