Do instrument kinematics and the apical preparation limit influence canal disinfection and bacterial extrusion?

This in vitro research assessed the influence of the instrument kinematics (rotary and reciprocating) and the apical preparation limit on the root canal disinfection and apical bacterial extrusion. After 21 days of Enterococcus faecalis biofilm formation in 72 mesial root canals of mandibular molars, the root canals were distributed into 2 groups (n = 36) according to the systems used for preparation: ProDesign S and Reciproc. The groups were redistributed according to the limit of apical preparation (n = 11): (a) 1 mm up to the apical foramen (TL-1); (b) at the apical foramen (TL = 0); (c) 1 mm beyond the apical foramen (TL + 1).

Effect of final irrigation protocols on the structural integrity and mechanical properties of the root dentine.

This study compared the effects of different final irrigation protocols on the mechanical properties and structural integrity of root dentine. One-hundred eight teeth were instrumented and irrigated with sodium hypochlorite (NaOCl) using conventional irrigation (CI). Teeth were distributed into four groups based on final irrigation protocols: Control Group (CG): 17%EDTA/CI + H2O; G1: 2.

Adherence to Registration and Selective Outcome Reporting in Randomized Clinical Trials Published in Endodontic Journals Over the Past 5 Years: A Meta-Research Study.

Introduction: Prospective registration of randomized clinical trials (RCTs) is highly recommended to ensure research transparency and prevent selective outcome reporting (SOR). This study aimed to evaluate the adherence to registration and the presence of SOR in RCTs published in endodontic journals over the past 5 years.

Methods: Electronic searches were conducted in PubMed and the libraries of the Journal of Endodontics, International Endodontic Journal, European Endodontic Journal, and Australian Endodontic Journal.

Clinical Management of Orofacial Trauma Including Multiple Avulsions, Lateral Luxation, and Alveolar Fracture: A Case Report with 7-Years of Follow-Up.

The occurrence of different types of trauma concomitantly can complicate the establishment of the most appropriate treatment. This report describes the clinical management of orofacial trauma including multiple avulsions, lateral luxation, alveolar fracture, and their sequelae after 7 years of follow-up. A 19-year-old woman presented to emergency care 4 hours after an accidental fall that resulted in the avulsion of teeth #8, #9, and #25; a complicated crown fracture and lateral luxation of tooth #7; an uncomplicated crown fracture of tooth #10; and a fracture of the maxillary alveolar bone.

Supplementary methods for filling material removal: A systematic review and meta-analysis of micro-CT imaging studies.

Objective: To evaluate the efficacy of supplementary methods, including Passive Ultrasonic Irrigation (PUI), ultrasonic inserts, XP-Endo Finisher, XP-Endo Finisher R, Easy Clean, sonic activation, and the Er:YAG laser (SWEEPS), in removing residual filling material (RFM) during endodontic retreatment.

Method: Five electronic databases and gray literature were searched on May 5, 2024. Two independent reviewers selected laboratory studies that assessed the efficacy of supplementary methods for RFM removal using micro-CT imaging.

Tooth Discoloration Induced by Endodontic Sealers of Different Chemical Bases: A Systematic Review.

The present study aimed to assess the tooth discoloration induced by endodontic sealers and establish a correlation between their distinct chemical compositions and this aesthetic concern. Five electronic databases and grey literature were systematically screened to identify studies comparing the tooth discoloration potential of endodontic sealers with different chemical bases. Studies that did not evaluate human teeth or did not employ spectrophotometry as a method for color measurement were excluded.

Do the apical limit and diameter of the instrumentation influence the extrusion of sodium hypochlorite solution? A micro-CT study.

This study evaluated the influence of the apical limit and the diameter of the instrumentation on the extrusion of the irrigating solution. Sixty human lower premolars were distributed into 5 groups according to the apical limit and diameter of the root canal instrumentation (n = 12): (G-1) R40 instrument 1 mm above the tooth length (TL) (Control); (G-1) R50 instrument 1 mm above the TL; (GF) R25 instrument at the TL; (GF) R40 instrument at the root canal length and (GF) R50 instrument at the TL. A space of 33.

Patient-related predictors of post-operative pain following root canal treatment: A structural model analysis.

Aim: The pathways to post-operative pain are complex and encompass factors that extend beyond the treatment protocol employed. This study aimed to identify patient-related predictors of post-operative pain following root canal treatment.

Methodology: A total of 154 patients received a single-visit root canal treatment for asymptomatic necrotic mandibular molars.

Ultrasonic activation of adhesive systems increases bond strength and intratubular penetration of resin cement in root dentin subjected to radiation therapy.

Objective: This study aimed to evaluate the effect of ultrasonic activation of etch-and-rinse and self-etch adhesive systems on the bond strength of resin cement to irradiated root dentin.

Materials And Methods: Eighty human maxillary anterior teeth were distributed into 8 groups (n = 10), according to the type of adhesive system used (etch-and-rinse and self-etch), the ultrasonic activation of the adhesive systems, and the dentin condition (irradiated or non-irradiated - 70 Gy). Endodontic treatment was performed followed by fiberglass post-space preparation.

Postoperative pain after endodontic treatment using 8.25% vs 2.5% sodium hypochlorite in necrotic mandibular molars with apical periodontitis: A randomized double-blind clinical trial.

Background: This study aimed to evaluate whether the use of 8.25% sodium hypochlorite (NaOCl), compared with the use of 2.5% NaOCl, leads to higher postoperative pain after endodontic treatment.

Assessment of multispecies biofilm growth on root canal dentin under different radiation therapy regimens.

Objectives: To assess the growth of a multispecies biofilm on root canal dentin under different radiotherapy regimens.

Materials And Methods: Sixty-three human root dentin cylinders were distributed into six groups. In three groups, no biofilm was formed (n = 3): NoRT) non-irradiated dentin; RT55) 55 Gy; and RT70) 70 Gy.

Longer light-curing time decreases the effect of ageing on composite resin hardness used in root reinforcement.

This study evaluated the hardness of a composite resin used for root reinforcement, considering the light-curing time, root canal region and ageing due to long-term storage. Twenty incisor roots were reinforced using composite resin, varying the photopolymerisation time (40 or 120 s). Following fibre post cementation, the roots were transversely sectioned into coronal, middle and apical regions.

Postoperative pain after single-visit root canal treatments in necrotic teeth comparing instruments' kinematics and apical instrumentation limits - a prospective randomized multicenter clinical trial.

Objectives: This prospective randomized multicenter clinical trial (PRMCT) investigated postoperative pain after single-visit root canal treatments in teeth affected by pulp necrosis (PN), and asymptomatic apical periodontitis (AAP) (with apical radiolucent areas) or normal periradicular tissues (without apical radiolucent areas) comparing different instruments' kinematics and apical instrumentation limits.

Methods: Before chemomechanical preparation, 240 patients/teeth were randomly distributed into four groups (n = 60) according to the instruments' kinematics (rotary or reciprocating) and apical instrumentation limits (with or without intentional foraminal enlargement [IFE]). After that, specimens were submitted to the same irrigation and obturation techniques, and the patients were referred to undergo the definitive restorations.

A Global Overview on Electronic Apex Locator Use From 1968 to 2023: A Bibliometric Analysis.

Introduction: This bibliometric review analyzed the research trends and main characteristics of articles related to Electronic Apex Locators (EALs).

Methods: The search was conducted in November 2023 on the Web of Science Core Collection. Narrative and systematic reviews, observational and intervention studies, laboratory, and clinical studies were included.

Effect of the timing of primary endodontic treatment and dosage of radiation therapy on the filling material removal.

This study investigated the effect of the timing of primary endodontic treatment and dosage of radiotherapy on the remaining filling material (RFM) during endodontic reintervention. 60 single-rooted human mandibular premolars were distributed into five groups (n = 12), according to the timing and dosage of radiation (55Gy or 70Gy): NegativeCG-non-irradiated teeth; Endo-pre-RT-obturation before irradiation (55Gy or 70Gy); Endo-post-RT-obturation and reintervention after irradiation (55Gy or 70Gy). Roots were cleaved and analysed under stereomicroscope and Scanning Electron Microscope to quantify (%) the RFM.

Assessing push-out bond strength in re-irradiated teeth: Universal resin cement performance in self-etch and self-adhesive modes.

Objectives: To investigate the effect of cumulative doses of radiation on the pushout bond strength (BS) of a universal resin cement used in the self-etch (SE) and self-adhesive (SA) modes to the intraradicular dentin.

Materials And Methods: Forty-eight human teeth were distributed into three groups (n = 16) according to the radiation therapy dose (RT): NoRT (no-radiotherapy), 70RT (70 Gy), and 70 + 70RT (70 Gy + 70 Gy). The teeth were redistributed into two subgroups (n = 8), according to the adhesive mode: SE (NoRT-SE, 70RT-SE, and 70 + 70RT-SE) and SA (NoRT-SA, 70RT-SA, and 70 + 70RT-SA).

Comparative Analysis of AH Plus Bond Strength to Root Canal Dentin and Adhesive Interface Quality after Calcium Hydroxide Removal using Different Irrigation Protocols.

Introduction: To evaluate the push-out bond strength (POBS) of AH Plus sealer to root dentin and the adhesive interface quality after calcium hydroxide (Ca(OH)) intracanal dressing removal with different final irrigation protocols.

Method: After root canal instrumentation and irrigation, 40 root canals were filled with Ca(OH) and sealed. After 14 days, the specimens were randomly distributed according to the irrigation protocols for Ca(OH) removal (n = 10): G (control) - distilled water; G - 1% NaOCl; G - 17% EDTA; G - 17% EDTA + 1% NaOCl.

How Does Intentional Apical Foraminal Enlargement Affect the Foramen and Root Canal Morphology?

Introduction: This study assessed the effect of intentional foraminal enlargement on the foramen and the apical root canal morphology.

Method: Sixty mesial roots of mandibular molars were scanned by micro-computed tomography. Their apical foramina were photographed with a stereomicroscope before and after preparation.

Do Ultraconservative Access Cavities Hinder Endodontic Reintervention in Mandibular Incisors? A Laboratory Investigation.

This study assessed the influence of the type of endodontic access cavity on endodontic reintervention. Twenty mandibular central incisors were distributed into two groups ( = 10): TradAC group-traditional access cavities and UltraAC.Inc group-ultraconservative access cavities.

Can Heated Distilled Water Effectively Prevent Precipitate Formation between NaOCl and CHX?

Introduction: The present study aimed to investigate the capacity of different irrigation protocols using heated distilled water at 65°C (HDW), in preventing the formation of the brown-orange precipitate observed after the interaction between sodium hypochlorite (NaOCl) and chlorhexidine (CHX).

Methods: Forty human canines were selected, prepared, and cleaved in two halves. Images of delimited areas in each root canal thirds were obtained through a stereomicroscope (16x and 40x).

Ultrasonic activation of the endodontic sealer enhances its intratubular penetration and bond strength to irradiated root dentin.

To evaluate the effect of ultrasonic activation of the endodontic sealer on its intratubular penetration and bond strength to irradiated root dentin. Forty human teeth were distributed into 4 groups (n = 10), according to the radiation therapy (RT) exposure-70 Gy-and ultrasonic activation (UA) of the endodontic sealer: RT/UA-irradiated teeth and sealer UA; RT/no-UA-irradiated teeth and no sealer UA; no-RT/UA-non-irradiated teeth and sealer UA and no-RT/no-UA-non-irradiated teeth and no sealer UA. Push-out bond strength test was performed in a Universal Testing Machine.

Impact of Heating Exposure on the Micro-Push-Out Bond Strength of Bioceramic Sealers.

Introduction: The aim of this study was to evaluate the effect of heating of bioceramic and epoxy resin-based sealers on their micro-push-out bond strength (BS) to root canal dentin.

Methods: After criterial selection, 30 human teeth were decoronated and 1-mm thick slices ( = 60) were obtained perpendicularly along tooth axis, from cervical and middle root thirds, with a diamond disc attached to a cutting machine. In each slice, three 1.

The effects of heating on the physicochemical properties of tricalcium silicate root canal sealers.

This study evaluated the effect of heating on the physicochemical properties and surface changes of tricalcium silicate sealers. Three tricalcium silicate root canal sealers (Bio-C Sealer, BioRoot-RCS, EndoSequence BC Sealer), and one epoxy resin-based sealer (AH Plus; control) were tested. The effect of heating on setting time (ST) and flowability were assessed according to ANSI/ADA 57 and ISO 6876 standards.

Did in-between rinsing and agitating with distilled water prevents precipitate formation by the interaction between sodium hypochlorite and chlorhexidine canal irrigants?

The interaction of sodium hypochlorite (NaOCl) and chlorhexidine gluconate (CHX) produces an orange-brown precipitate. The present study evaluated the influence of distilled water (H O) in different irrigation protocols designed to prevent the formation of precipitate with NaOCl and CHX. Fifty canine teeth were instrumented and split longitudinally.