6,550 results match your criteria root apex


Repair of teeth with cracks in crowns and roots: An observational clinical study.

Int Endod J 2021 Jul 22. Epub 2021 Jul 22.

Head and Neck Department, "Fondazione Policlinico Universitario IRCCS", Rome, Italy.

Aim: This retrospective observational study investigated the survival rate of teeth with radicular cracks that were restored using composite materials.

Methodology: The study was approved by the Ethical Committee of Sistema Sanitario Nazionale (prot. N°2370CELazio1), Clinicaltrials. Read More

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Radiographic and electronic working length comparison. An study of three Electronic Apex Locator devices.

J Biol Regul Homeost Agents 2021 May-Jun;35(3 Suppl. 1):77-85

Department of Clinical Sciences and Translational Medicine, University of Rome "Tor Vergata", Rome, Italy.

The aim of this study is to compare the working length measured with Root ZX (EAL1), Propex II (EAL2) and Endo Analyzer Model 8005 (EAL3) with radiographic measurements during endodontic treatment. Fifty single canal teeth scheduled for endodontic treatment were selected for the study. After endodontic access preparation, pulp chamber was irrigated with 5mL of 5% sodium hypochlorite (NaOCl). Read More

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Local regulation of auxin transport in root-apex transition zone mediates aluminium-induced Arabidopsis root growth inhibition.

Plant J 2021 Jul 17. Epub 2021 Jul 17.

The Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Science, Shandong University (Qingdao), Qingdao, 266237, P. R. China.

Aluminium (Al) stress is a major limiting factor for worldwide crop production in acid soils. In Arabidopsis thaliana, the TAA1-dependent local auxin biosynthesis in the root-apex transition zone (TZ), the the major perception site for Al toxicity, is crucial for the Al-induced root growth inhibition, while the mechanism underlying Al-regulated auxin accumulation in the TZ is not fully understood. In this study, the role of auxin transport in Al-induced local auxin accumulation in the TZ and root growth inhibition was investigated. Read More

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Assessment of Apical Extrusion of Debris during Root Canal Preparation with Different Ni-Ti File Systems: An Study.

J Contemp Dent Pract 2021 Apr 1;22(4):349-352. Epub 2021 Apr 1.

Department of Oral Pathology and Microbiology, Educare Institute of Dental Sciences, Malappuram, Kerala, India.

Aim And Objective: The aim of this study was to evaluate the apical extrusion of debris during root canal preparation with the use of different Nickel-Titanium (Ni-Ti) file systems.

Materials And Methods: Totally 60 single-rooted human mandibular premolar teeth with fully formed roots were chosen for the study. The coronal access cavity and all other preparations were done with the use of an access cavity kit and then 60 samples were randomly separated into three investigational groups ( = 20); group I: self-adjusting file, group II: WaveOne Gold, and group III: Mtwo rotary system. Read More

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Light emitting diode assessment of dentinal microcracks after root canal preparation with 4 different heat-treated file systems.

Minerva Dent Oral Sci 2021 Jul 15. Epub 2021 Jul 15.

Department of Conservative Dentistry and Endodontics, Sri Aurobindo College of Dentistry, Indore, Madhya Pradesh, India.

Aim: The purpose of this research was to evaluate the dentinal microcracks formation after root canal preparation with Hyflex EDM (Electrical Discharge Machining), Neolix Neoniti A1 EDM, Wave One Gold and Edge File X1 under illumination and magnification.

Materials And Methods: 150 mandibular molars with 2 different mesial canals extracted for periodontal reasons were included in the study. The samples were decoronated at 15mm from the apex using a carborundum disc under copious water cooling. Read More

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Dentinal tubule penetration of gutta-percha with syringe-mix resin sealer using different obturation techniques: A confocal laser scanning microscopy study.

Aust Endod J 2021 Jul 13. Epub 2021 Jul 13.

Department of Endodontics, Faculty of Dentistry, Zonguldak Bülent Ecevit University, Zonguldak, Turkey.

This study aimed to evaluate dentinal tubule penetration of the root canal filling material using various techniques such as cold lateral compaction, new generation thermoplastic core carrier and continuous-wave obturation. The root canals of premolar teeth were instrumented, and the teeth were allocated randomly to three groups (n = 15/group). After the obturation with three different techniques, three sections of 2-mm thickness at 2, 5 and 8-mm from the apex were examined under a confocal laser scanning microscope. Read More

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Prevalence of Missed Canals and Their Association with Apical Periodontitis in Posterior Endodontically Treated Teeth: A CBCT Study.

Int J Dent 2021 28;2021:9962429. Epub 2021 Jun 28.

Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia.

Background: This study aimed to assess the prevalence of missed canals in endodontically treated teeth and their association with apical periodontitis in a Saudi Arabian population using CBCT.

Materials And Methods: A total of 208 CBCT radiographs were investigated. For each tooth, radiographs of axial, coronal, and sagittal segments were acquired to appraise the external as well as the internal structure of the root canal system and apical area. Read More

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Novel Sources of Tolerance to Aluminium Toxicity in Wild ( and ) Collections.

Front Plant Sci 2021 25;12:678211. Epub 2021 Jun 25.

Centre for Sustainable Farming Systems, Future Food Institute, Murdoch University, Perth, WA, Australia.

In acid soils, the toxic form of aluminium, Al, significantly inhibits root growth and elongation, leading to less water and nutrient uptake. Previous research had shown differential Al toxicity tolerance among cultivated L. (chickpea); however, the potential for developing tolerant cultivars is limited by the narrow genetic diversity of cultivated chickpeas. Read More

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Genome Wide Association Mapping of Root Traits in the Andean Genepool of Common Bean ( L.) Grown With and Without Aluminum Toxicity.

Front Plant Sci 2021 25;12:628687. Epub 2021 Jun 25.

Department of Agricultural and Environmental Sciences, Tennessee State University, Nashville, TN, United States.

Common bean is one of the most important grain legumes for human diets but is produced on marginal lands with unfavorable soil conditions; among which Aluminum (Al) toxicity is a serious and widespread problem. Under low pH, stable forms of Al dissolve into the soil solution and as phytotoxic ions inhibit the growth and function of roots through injury to the root apex. This results in a smaller root system that detrimentally effects yield. Read More

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Assessment of the relationship between the maxillary sinus and the canine root tip using cone beam computed tomography.

BMC Oral Health 2021 Jul 10;21(1):338. Epub 2021 Jul 10.

Eastman Institute for Oral Health, Rochester, USA.

Background: The purpose of the present study is to investigate the relationship between the maxillary sinus and the canine root apices in cone beam computed tomographic images (CBCT) and to assess the amount of extension of the maxillary sinus to the anterior region of the jaw in different sexes and age groups.

Methods: CBCT of 300 individuals (154 males and 146 females) over 20 years (with a mean age of 35.12 ± 8. Read More

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Three-dimensional morphologic classifications and analysis of canal isthmuses in permanent molars.

Surg Radiol Anat 2021 Jul 10. Epub 2021 Jul 10.

Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, No.22, Zhongguancun South Avenue, Haidian District, Beijing, 100081, China.

Purpose: To investigate the three-dimensional morphology of isthmuses in molars according to their boundary characteristics using micro-computed tomography (micro-CT).

Methods: Micro-CT reconstructed images of 248 molars were evaluated. Isthmuses were classified into four types based on the boundary characteristics: isthmus with roof, isthmus with floor, band-shaped isthmus, and isthmus without boundary. Read More

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Components and Functional Diversification of Florigen Activation Complexes in Cotton.

Plant Cell Physiol 2021 Jul 10. Epub 2021 Jul 10.

College of Life Sciences, Shihezi University, Shihezi 832003, China.

In shoot apex cells of rice, a hexameric florigen activation complex (FAC), comprising FLOWERING LOCUS T (FT), 14-3-3 and the bZIP transcription factor FD, activates downstream target genes and regulates several developmental transitions, including flowering. The allotetraploid cotton (Gossypium hirsutum L.) contains only one FT locus in both of the A- and D-subgenomes. Read More

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Biological Aspects of the Tongue and Oropharyngeal Cavity of the Eurasian Collared Dove (, Columbiformes, Columbidae): Anatomical, Histochemical, and Ultrastructure Study.

Microsc Microanal 2021 Jul 8:1-17. Epub 2021 Jul 8.

Department of Zoology, Faculty of Science, Mansoura University, Mansoura, Egypt.

We characterized the morphological and anatomical adaptations of the lingual microstructures of the Eurasian collared dove and discussed their implications for its dietary niche. We analyzed tongues of nine S. decaocto using histological, histochemical, stereomicroscopic, and scanning electron microscopic techniques. Read More

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Comparison of anterior maxillary and mandibular alveolar parameters in African American and Caucasian women: A retrospective pilot study.

Imaging Sci Dent 2021 Jun 11;51(2):175-185. Epub 2021 Mar 11.

Division of Orthodontics, University of Louisville School of Dentistry, Louisville, KY, USA.

Purpose: The primary objective of this study was to analyze the thickness and height of alveolar bone around the maxillary and mandibular incisors. Additionally, this study aimed to compare bone parameters between Caucasian (CC) and African American (AA) female patients.

Materials And Methods: In this retrospective pilot study, 50 female subjects (25 CC and 25 AA) were included. Read More

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Effect of Different Irrigation Activation Techniques on Sealer Penetration: A Confocal Laser Microscopy Study.

Chin J Dent Res 2021 Jun;24(2):113-118

Objective: To compare the efficiency of a new sonic powered irrigation system named EDDY (VDW, Munich, Germany), passive ultrasonic irrigation (PUI) and conventional needle irrigation (CNI) in root canal sealer penetration.

Methods: A total of 45 mandibular premolars were instrumented up to size 30, 0.9 taper and randomly divided into three groups (n = 15) depending on the final irrigation activation technique: EDDY, PUI or CNI. Read More

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Prospective cohort study of regenerative potential of non vital immature permanent maxillary central incisors using platelet rich fibrin scaffold.

Sci Rep 2021 Jul 1;11(1):13679. Epub 2021 Jul 1.

Department of Conservative Dentistry and Endodontics, SRM Dental College, SRM Institute of Science and Technology, Tamil Nadu, Ramapuram Campus, Bharathi Salai, Ramapuram, Chennai, 600 089, India.

Regenerative endodontic procedures have gained momentum as a treatment modality of young immature permanent teeth. Literature reports reveal that platelet-rich fibrin (PRF) stimulates growth factors and induces regeneration. This study was undertaken to assess the regenerative potential of non-vital immature permanent maxillary central incisors using PRF with a follow-up for 2 yrs. Read More

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Root Microcracks Formation during Root Canal Instrumentation Using Reciprocating and Rotary Files.

J Contemp Dent Pract 2021 Mar 1;22(3):259-263. Epub 2021 Mar 1.

Faculty of Medical Dentistry, Mohammed V University, Rabat, Morocco.

Aim And Objective: The aim of this study was to compare the formation of dentinal cracks with nickel-titanium (NiTi) instruments working in continuous rotation and reciprocating motion.

Materials And Methods: One hundred sixty extracted human mandibular first molars were selected for the study. The mesial roots were resected and mounted in resin blocks with simulated periodontal ligaments. Read More

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Efficacy of Different Endodontic Irrigant Activation Techniques on Debris Removal from the Mesial Root Canal System of Mandibular Molars.

J Contemp Dent Pract 2021 Mar 1;22(3):231-236. Epub 2021 Mar 1.

Department of Restorative Dental Science, College of Dentistry, King Saud University, Riyadh, Kingdom of Saudi Arabia.

Aim And Objective: This study was conducted to compare debris removal from the mesial canal system with four different irrigation techniques: sonic activation with EDDY, passive ultrasonic irrigation (PUI), mechanical activation with the XP-endo Finisher (XPF), and manual dynamic irrigation (MDI) with gutta-percha.

Materials And Methods: Fifty-six extracted mandibular molars with isthmus in the apical 5 mm in mesial roots were sectioned horizontally at 3 mm and 5 mm from the apex. The sections were reassembled, and the mesial canals were prepared chemomecahanically. Read More

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Operative Torque Analysis to Evaluate Cutting Efficiency of Two Nickel-Titanium Rotary Instruments for Glide Path: An Comparison.

J Contemp Dent Pract 2021 Mar 1;22(3):215-218. Epub 2021 Mar 1.

Department of Oral and Maxillo-facial Sciences, Sapienza University of Rome, Rome, Italy.

Aim And Objective: The aim and objective of this study was to evaluate and compare the cutting efficacy of two different nickel titanium rotary instruments by a novel methodology: the operative torque (torque and time needed to progress toward the apex).

Materials And Methods: Ten fresh extracted upper first premolars with two canals were instrumented with a KaVo (Biberach, Germany) and a KaVo 1:1 handpiece at 300 rpm with maximum torque set at 2 N. One canal was instrumented with ProGlider NiTi rotary instruments (Dentsply Sirona Endodontics, Ballaigues, Switzerland), with tip size of 16. Read More

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Spatiotemporal and Quantitative Monitoring of the Fate of " Phytoplasma Solani" in Tomato Plants Infected by Grafting.

Pathogens 2021 Jun 26;10(7). Epub 2021 Jun 26.

Department of Agricultural, Food, Environmental and Animal Sciences (DI4A), University of Udine, Via delle Scienze 206, 33100 Udine, Italy.

Understanding how phytoplasmas move and multiply within the host plant is fundamental for plant-pathogen interaction studies. In recent years, the tomato has been used as a model plant to study this type of interaction. In the present work, we investigated the distribution and multiplication dynamics of one strain of " Phytoplasma (. Read More

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Influence of Coronal Preflaring on the Accuracy of Electronic Working Length Determination: Systematic Review and Meta-Analysis.

J Clin Med 2021 Jun 23;10(13). Epub 2021 Jun 23.

Endodontic Section, Department of Stomatology, University of Sevilla, C/Avicena s/n, 41009 Sevilla, Spain.

Aim: To conduct a systematic review and meta-analysis according to the following PICO question: in extracted human permanent teeth, does preflaring, compared with unflared canals, influence the accuracy of WL determination with EAL?

Material And Methods: A systematic review was conducted according to the PRISMA checklist, using the following databases: PubMed, Science Direct, Scopus, and Web of Science. Studies related to WL determination using EAL both in preflared and unflared root canals of extracted human teeth were included. The outcome of interest was the accuracy of the electronic WL determination. Read More

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An In Vitro Stereomicroscopic Evaluation of Bioactivity between Neo MTA Plus, Pro Root MTA, BIODENTINE & Glass Ionomer Cement Using Dye Penetration Method.

Materials (Basel) 2021 Jun 8;14(12). Epub 2021 Jun 8.

Department of Surgical, Oncological and Stomatological Disciplines, University of Palermo, 90133 Palermo, Italy.

The ideal root end filling material should form a tight seal in the root canal by adhering to the cavity walls. Several materials have been used for root end filling. The present study aims to find out and compare the bioactivity of Neo MTA Plus, Pro Root MTA White, BIODENTINE & glass ionomer cement as root end filling materials using 1% methylene blue as tracer. Read More

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Comparative Evaluation of Mineral Trioxide Aggregate Obturation Using Four Different Techniques-A Laboratory Study.

Materials (Basel) 2021 Jun 7;14(11). Epub 2021 Jun 7.

Adelaide Dental School, University of Adelaide, Adelaide, SA 5000, Australia.

This study aimed to compare the density of mineral trioxide aggregate (MTA) as a root canal filling material in the apical 5 mm of artificial root canals. Forty transparent acrylic blocks with 30-degree curved canals were instrumented and allocated into four compaction technique groups ( = 10): Lawaty (hand files); gutta-percha (GP) points; auger (nickel-titanium rotary files in reverse mode); and plugger technique. Filled canals were weighed after setting the MTA to calculate difference in mass. Read More

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Use of Mineral Trioxide Aggregate with or without a Collagen Sponge as an Apical Plug in Teeth with Immature Apices.

J Clin Pediatr Dent 2021 Jul;45(3):165-170

Objective: This retrospective study aimed to evaluate the clinical outcomes of the apical plug performed using MTA with or without collagen sponge in immature anterior maxillary teeth with necrotic pulp.

Study Design: The study included apical obturation of 20 upper incisor teeth from 18 patients and outcomes of 12-month follow-up. The teeth were divided into 2 groups with 10 cases in each group according to the apexification protocol (Group 1; apical plug with MTA, Group 2; collagen sponge and apical plug with MTA). Read More

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Accuracy of Root ZXII, E-PEX and FIND apex locators in teeth with vital pulp: an in vivo study.

Braz Oral Res 2021 28;35:e080. Epub 2021 Jun 28.

Universidade Estadual Paulista "Júlio de Mesquita Filho" - Unesp, Araçatuba. School of Dentistry, Department of Endodontics, Araçatuba, SP, Brazil.

This research evaluated, in vivo, the accuracy of three electronic apex locators - EALs (Root ZXII, E-PEX and FIND) in teeth with vital pulp submitted to biopulpectomy, preserving the periodontal stump. For this study, 90 single-rooted teeth with extraction indication were selected. After positive pulpal cold sensitivity test, pulp chamber access was performed. Read More

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Enhanced aluminum tolerance in sugarcane: evaluation of SbMATE overexpression and genome-wide identification of ALMTs in Saccharum spp.

BMC Plant Biol 2021 Jun 29;21(1):300. Epub 2021 Jun 29.

Genetics and Biotechnology Laboratory, Embrapa Agroenergy, Brasilia, 70770-901, DF, Brazil.

Background: A major limiting factor for plant growth is the aluminum (Al) toxicity in acidic soils, especially in tropical regions. The exclusion of Al from the root apex through root exudation of organic acids such as malate and citrate is one of the most ubiquitous tolerance mechanisms in the plant kingdom. Two families of anion channels that confer Al tolerance are well described in the literature, ALMT and MATE family. Read More

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Ultrastructural features on the oral cavity floor (tongue, sublingual caruncle) of the Egyptian water buffalo (Bubalus bubalis): gross, histology and scanning electron microscope.

Folia Morphol (Warsz) 2021 Jun 29. Epub 2021 Jun 29.

Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Kafrelsheikh University, 33511 Kafrelsheikh, Egypt, Kafrelsheikh.

The present work was focused on the morphological characters of the lingual caruncles, and tongue with its papillae of Egyptian water buffalo (Bubalus bubalis) using the gross, light, and scanning electron microscope. The ventral surface of the sublingual caruncle carried a small opening of the duct of both monostoamtic and mandibular salivary gland. The lingual mucosa of dorsal, lateral border, some extent to ventral surface of apex had lingual papillae (filiform, fungiform), while the lingual mucosa of body especially at torus linguae had conical papillae, but circumvallate papillae observed at the caudal part of body and root. Read More

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Canine avulsion: An extreme complication of a fixed mandibular lingual retainer.

Authors:
Parmjit Singh

Am J Orthod Dentofacial Orthop 2021 Jun 23. Epub 2021 Jun 23.

Faculty of Orthodontics, College of Medicine and Dentistry, University of Ulster, Birmingham, United Kingdom. Electronic address:

The use of fixed retainers at the end of a course of orthodontic treatment has become standard practice. The main complication that can occur with fixed retainers is the detachment of the wire from one or more teeth. A less common complication is unwanted tooth movement. Read More

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Root Stem Cell Niche networks: It's complexed! A review on gene networks regulating the Arabidopsis root stem cell niche.

J Exp Bot 2021 Jun 26. Epub 2021 Jun 26.

Wageningen University & Research, Plant Sciences department, Plant Developmental Biology group, Droevendaalsesteeg, Wageningen, Netherlands.

The presence of two meristematic cell populations in the root and shoot apex allow plants to grow indefinitely. Due to its simple and predictable tissue organisation, the Arabidopsis root apical meristem remains an ideal model to study mechanisms such as stem cell specification, asymmetric cell division and differentiation in plants. The root stem cell niche consists of a quiescent organizing center surrounded by mitotically active stem cells, that originate all root tissues. Read More

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CBCT comparison of buccal shelf bone thickness in adult Dravidian population at various sites, depths and angulation - A retrospective study.

Int Orthod 2021 Jun 22. Epub 2021 Jun 22.

Saveetha Institute Of Medical And Technical Sciences, Saveetha Dental College, Saveetha University, Department of Orthodontics, 600077 Chennai, India. Electronic address:

Introduction: It is important to understand the variations in the bone thickness of the buccal shelf region among different ethnic groups, as these variations will influence the placement and success of the buccal shelf mini-screw.

Objectives: The primary objective was to analyse the total buccal bone and cortical bone thickness of the mandibular buccal shelf region (MBS) at various depths, mesiodistal positions and angulations in Dravidian population and to find the best site for insertion of buccal shelf mini-implant.

Material And Methods: This was a retrospective study done on 30 cone-beam computed tomography samples collected from 30 subjects, aged 16 to 25 years and of Dravidian origin, who reported for orthodontic treatment. Read More

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