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Journal of Oral Science Jan 2022The aim of this study was to use dye penetration to measure apical and coronal leakage simultaneously in single-canal teeth that had been treated endodontically using a... (Randomized Controlled Trial)
Randomized Controlled Trial
PURPOSE
The aim of this study was to use dye penetration to measure apical and coronal leakage simultaneously in single-canal teeth that had been treated endodontically using a single-cone obturation technique.
METHODS
One hundred single-canal, extracted human teeth were cleaned and shaped with ProTaper NEXT rotary files to size-X5 (50/.06), then randomly assigned to five sealer groups for single-cone gutta-percha obturation. The teeth were soaked in 0.6% rhodamine B at 37°C for seven days, then the roots were ground mesiodistally and the maximum apical and coronal dye penetration was measured. Differences in leakage among the sealer groups were examined using the Kruskal-Wallis test. Pairwise comparisons were made using the Mann-Whitney test with Bonferroni correction.
RESULTS
The mean values (mm) of dye penetration for AH Plus, Pulp Canal Sealer, NeoSEALER Flo, EndoSequence BC, and Super-Bond RC Sealer were 0.200, 0.300, 0.675, 0.850, and 0.900 apically, whereas 1.675, 2.075, 4.800, 6.500, and 4.125 coronally. Pairwise comparisons showed significant apical differences between AH Plus/Super-Bond RC Sealer (P = 0.047) and significant coronal differences between AH Plus/NeoSEALER Flo (P = 0.001), AH Plus/EndoSequence BC (P < 0.01), AH Plus/Super-Bond RC Sealer (P < 0.01), Pulp Canal Sealer/NeoSEALER Flo (P = 0.010), Pulp Canal Sealer/EndoSequence BC (P < 0.01), and Pulp Canal Sealer/Super-Bond RC Sealer (P < 0.01).
CONCLUSION
Coronal leakage was worse than apical leakage for all sealers. AH Plus exhibited the least leakage apically and coronally; Super-Bond RC Sealer showed the most leakage apically, and EndoSequence BC showed the most leakage coronally.
Topics: Dental Pulp Cavity; Epoxy Resins; Gutta-Percha; Humans; Root Canal Filling Materials; Root Canal Obturation
PubMed: 34980828
DOI: 10.2334/josnusd.21-0433 -
Dental and Medical Problems 2022The biophysical properties of root canal sealers (RCSs) positively affect the success of endodontic treatment. It is important to ensure an impermeable apical seal after...
BACKGROUND
The biophysical properties of root canal sealers (RCSs) positively affect the success of endodontic treatment. It is important to ensure an impermeable apical seal after the thorough eradication of the infection. Since bioceramic sealers release bioactive and concomitantly biocompatible products after setting, chemical bonding to dentin and favorable healing is achieved.
OBJECTIVES
This study evaluated the chemical composition and elemental distribution of 4 RCSs (1 resinbased and 3 bioceramic-based) by using energy dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FE-SEM) and elemental mapping after root canal obturation, both coronally and apically.
MATERIAL AND METHODS
Forty extracted single-rooted teeth were shaped, cleaned and randomly divided into 4 groups according to the type of sealer used for obturation. After the sealer set, the teeth were sectioned horizontally to obtain coronal and apical standardized sections. The sections were qualitatively and quantitatively assessed in terms of chemical composition of the tested sealers, using SEM images and elemental mapping as well as the EDX analysis.
RESULTS
All of the calcium silicate sealers showed significantly higher peaks of calcium at the periphery of the root canals, contacting dentinal moisture, and high peaks of zirconium, while tungsten was significantly high in AH Plus™. TotalFill® BC™ and BioRoot™ RCS showed higher calcium, oxygen and silicon content coronally than apically, while phosphorus was only detected more apically, which was different for EndoSeal® MTA. All sealers revealed small amounts of different heavy metals, not described by their manufacturers, and a uniform particle distribution with almost regular surfaces.
CONCLUSIONS
All of the tested sealers except AH Plus revealed high calcium/phosphorus ratio peaks, suggesting regenerative potential in vivo, with acceptable purity and surface texture, and supporting their biocompatibility, with chemical bonding to root dentin.
Topics: Epoxy Resins; Humans; Microscopy, Electron, Scanning; Root Canal Filling Materials; Root Canal Obturation; Tooth Root
PubMed: 35254010
DOI: 10.17219/dmp/133954 -
European Archives of Paediatric... Jun 2021To evaluate and assess the current knowledge about apexification and regenerative techniques as a meaningful treatment modality and to map the scientific evidence for...
PURPOSE
To evaluate and assess the current knowledge about apexification and regenerative techniques as a meaningful treatment modality and to map the scientific evidence for the efficacy of both methods for the management of traumatised immature teeth with pulp necrosis and apical periodontitis.
METHODS
This systematic review searched five databases: PubMed, Web of Science, Cochrane Library, Ovid (Medline), and Embase. Published articles written in English were considered for inclusion. The following keywords were used: Regenerative endodontic treatment OR regenerat* OR revital* OR endodontic regeneration OR regenerative endodontics OR pulp revascularization OR revasculari* OR 'traumatized immature teeth'. Only peer-reviewed studies with a study size of at least 20 cases followed up for 24 months were included. Eligibility assessment was performed independently in a blinded manner by three reviewers and disagreements were resolved by consensus. Subgroup analyses were performed on three clinical outcomes: survival, success, and continued root development.
RESULTS
Seven full texts out of 1359 citations were included and conventional content analysis was performed. Most of the identified citations were case reports and case series.
CONCLUSIONS
In the present systematic review, the qualitative analysis revealed that both regenerative and apexification techniques had equal rates of success and survival and proved to be effective in the treatment of immature necrotic permanent teeth. Endodontic regenerative techniques appear to be superior to apexification techniques in terms of stimulation of root maturation, i.e. root wall thickening and root lengthening. Knowledge gaps were identified regarding the treatment and follow-up protocols for both techniques.
Topics: Apexification; Dental Pulp; Dental Pulp Necrosis; Dentition, Permanent; Humans; Periapical Periodontitis; Root Canal Therapy
PubMed: 33420674
DOI: 10.1007/s40368-020-00575-1 -
FEMS Microbiology Reviews Nov 2019The plasma membrane (PM) performs a plethora of physiological processes, the coordination of which requires spatial and temporal organization into specialized domains of... (Review)
Review
The plasma membrane (PM) performs a plethora of physiological processes, the coordination of which requires spatial and temporal organization into specialized domains of different sizes, stability, protein/lipid composition and overall architecture. Compartmentalization of the PM has been particularly well studied in the yeast Saccharomyces cerevisiae, where five non-overlapping domains have been described: The Membrane Compartments containing the arginine permease Can1 (MCC), the H+-ATPase Pma1 (MCP), the TORC2 kinase (MCT), the sterol transporters Ltc3/4 (MCL), and the cell wall stress mechanosensor Wsc1 (MCW). Additional cortical foci at the fungal PM are the sites where clathrin-dependent endocytosis occurs, the sites where the external pH sensing complex PAL/Rim localizes, and sterol-rich domains found in apically grown regions of fungal membranes. In this review, we summarize knowledge from several fungal species regarding the organization of the lateral PM segregation. We discuss the mechanisms of formation of these domains, and the mechanisms of partitioning of proteins there. Finally, we discuss the physiological roles of the best-known membrane compartments, including the regulation of membrane and cell wall homeostasis, apical growth of fungal cells and the newly emerging role of MCCs as starvation-protective membrane domains.
Topics: Biological Transport; Cell Compartmentation; Cell Membrane; Cell Wall; Fungal Proteins; Fungi; Homeostasis; Membrane Proteins; Saccharomyces cerevisiae
PubMed: 31504467
DOI: 10.1093/femsre/fuz022 -
Journal of Proteome Research Feb 2022This study aimed to investigate the highly differentiated urothelial apical surface glycome. The functions of the mammalian urothelium, lining the majority of the...
This study aimed to investigate the highly differentiated urothelial apical surface glycome. The functions of the mammalian urothelium, lining the majority of the urinary tract and providing a barrier against toxins in urine, are dependent on the correct differentiation of urothelial cells, relying on protein expression, modification, and complex assembly to regulate the formation of multiple differentiated cell layers. Protein glycosylation, a poorly studied aspect of urothelial differentiation, contributes to the apical glycome and is implicated in the development of urothelial diseases. To enable surface glycome characterization, we developed a method to collect tissue apical surface - and O-glycans. A simple, novel device using basic laboratory supplies was developed for enzymatic shaving of the luminal bladder urothelial surface, with subsequent release and mass spectrometric analysis of apical surface O- and -glycans, the first normal mammalian urothelial -glycome to be defined. Trypsinization of superficial glycoproteins was tracked using immunolabeling of the apically expressed uroplakin 3a protein to optimize enzymatic release, without compromising the integrity of the superficial urothelial layer. The approach developed for releasing apical tissue surface glycans allowed for comparison with the -glycome of the total porcine bladder urothelial cells and thus identification of apical surface glycans as candidates implicated in the urothelial barrier function. Data are available in MassIve: MSV000087851.
Topics: Animals; Cell Differentiation; Epithelial Cells; Swine; Tooth Apex; Urinary Bladder; Urothelium
PubMed: 34985888
DOI: 10.1021/acs.jproteome.1c00714 -
Journal of Orofacial Orthopedics =... Jan 2021The amount of apical root resorption when using the torque-segmented archwire (TSA) was investigated as well as the extent and direction of the therapeutically indicated...
OBJECTIVE
The amount of apical root resorption when using the torque-segmented archwire (TSA) was investigated as well as the extent and direction of the therapeutically indicated apical movement and the treatment duration.
MATERIALS AND METHODS
The degree of apical root resorption in 18 randomly chosen Class II and Class I patients treated with the TSA, as well as in 18 conventionally treated patients were evaluated using pre- and posttreatment panoramic radiographs. The sagittal and vertical apical movements and inclination changes were determined based on pre- and posttreatment lateral cephalograms. Nonparametric tests were applied to test between treatment groups and steps. The Mann-Whitney U test, Kruskal-Wallis, Pearson correlation and Wilcoxon signed-rank test were applied for statistical analysis (p < 0.05).
RESULTS
The incidence of root resorptions was 89-94.4% in low or moderate level. The relative root-crown ratio (rRCR) was not statistically different between the TSA and control groups except tooth 12. The axis of the incisors in the TSA group was significantly improved. The main direction of movement of the apices of the central incisors was retrusion and extrusion. No interdependence between the amount of resorption and the parameters of treatment duration, extent and direction of apical movement were found.
CONCLUSION
The results of the study showed that the amount of apical root resorption with the TSA is slight to moderate and can be compared to conventional orthodontic treatment. The TSA is hence a suitable method for applying targeted torques to the incisors.
Topics: Humans; Root Resorption; Stainless Steel; Tooth Apex; Tooth Movement Techniques; Torque
PubMed: 32875350
DOI: 10.1007/s00056-020-00244-4 -
JACC. Cardiovascular Imaging May 2024There is no acceptable maximum wall thickness (MWT) threshold for diagnosing apical hypertrophic cardiomyopathy (ApHCM), with guidelines referring to ≥15 mm MWT for...
BACKGROUND
There is no acceptable maximum wall thickness (MWT) threshold for diagnosing apical hypertrophic cardiomyopathy (ApHCM), with guidelines referring to ≥15 mm MWT for all hypertrophic cardiomyopathy subtypes. A normal myocardium naturally tapers apically; a fixed diagnostic threshold fails to account for this. Using cardiac magnetic resonance, "relative" ApHCM has been described with typical electrocardiographic features, loss of apical tapering, and cavity obliteration but also with MWT <15 mm.
OBJECTIVES
The authors aimed to define normal apical wall thickness thresholds in healthy subjects and use these to accurately identify ApHCM.
METHODS
The following healthy subjects were recruited: healthy UK Biobank imaging substudy subjects (n = 4,112) and an independent healthy volunteer group (n = 489). A clinically defined disease population of 104 ApHCM subjects was enrolled, with 72 overt (MWT ≥15 mm) and 32 relative (MWT <15 mm but typical electrocardiographic/imaging findings) ApHCM subjects. Cardiac magnetic resonance-derived MWT was measured in 16 segments using a published clinically validated machine learning algorithm. Segmental normal reference ranges were created and indexed (for age, sex, and body surface area), and diagnostic performance was assessed.
RESULTS
In healthy cohorts, there was no clinically significant age-related difference for apical wall thickness. There were sex-related differences, but these were not clinically significant after indexing to body surface area. Therefore, segmental reference ranges for apical hypertrophy required indexing to body surface area only (not age or sex). The upper limit of normal (the largest of the 4 apical segments measured) corresponded to a maximum apical MWT in healthy subjects of 5.2 to 5.6 mm/m with an accuracy of 0.94 (the unindexed equivalent being 11 mm). This threshold was categorized as abnormal in 99% (71/72) of overt ApHCM patients, 78% (25/32) of relative ApHCM patients, 3% (122/4,112) of UK Biobank subjects, and 3% (13/489) of healthy volunteers.
CONCLUSIONS
Per-segment indexed apical wall thickness thresholds are highly accurate for detecting apical hypertrophy, providing confidence to the reader to diagnose ApHCM in those not reaching current internationally recognized criteria.
Topics: Humans; Female; Male; Cardiomyopathy, Hypertrophic; Middle Aged; Predictive Value of Tests; Adult; Reproducibility of Results; Aged; Case-Control Studies; Electrocardiography; Magnetic Resonance Imaging; United Kingdom; Magnetic Resonance Imaging, Cine; Machine Learning; Healthy Volunteers; Apical Hypertrophic Cardiomyopathy
PubMed: 37831014
DOI: 10.1016/j.jcmg.2023.07.012 -
Molecular Biology of the Cell May 2021The formation of an epithelial tube is a fundamental process for organogenesis. During embryonic salivary gland (SG) invagination, Folded gastrulation (Fog)-dependent...
The formation of an epithelial tube is a fundamental process for organogenesis. During embryonic salivary gland (SG) invagination, Folded gastrulation (Fog)-dependent Rho-associated kinase (Rok) promotes contractile apical myosin formation to drive apical constriction. Microtubules (MTs) are also crucial for this process and are required for forming and maintaining apicomedial myosin. However, the underlying mechanism that coordinates actomyosin and MT networks still remains elusive. Here, we show that MT-dependent intracellular trafficking regulates apical constriction during SG invagination. Key components involved in protein trafficking, such as Rab11 and Nuclear fallout (Nuf), are apically enriched near the SG invagination pit in a MT-dependent manner. Disruption of the MT networks or knockdown of impairs apicomedial myosin formation and apical constriction. We show that MTs and Rab11 are required for apical enrichment of the Fog ligand and the continuous distribution of the apical determinant protein Crumbs (Crb) and the key adherens junction protein E-Cadherin (E-Cad) along junctions. Targeted knockdown of or in the SG disrupts apical myosin networks and results in apical constriction defects. Our data suggest a role of MT- and Rab11-dependent intracellular trafficking in regulating actomyosin networks and cell junctions to coordinate cell behaviors during tubular organ formation.
Topics: Actin Cytoskeleton; Actomyosin; Animals; Biological Transport; Cadherins; Drosophila; Drosophila Proteins; Dyneins; Gastrulation; Gene Knockdown Techniques; Intercellular Junctions; Microtubules; Myosins; Nuclear Proteins; Salivary Glands; rab GTP-Binding Proteins
PubMed: 33788621
DOI: 10.1091/mbc.E21-01-0021 -
Nature Microbiology Nov 2022Members of Apicomplexa are defined by apical cytoskeletal structures and secretory organelles, tailored for motility, invasion and egress. Gliding is powered by...
Members of Apicomplexa are defined by apical cytoskeletal structures and secretory organelles, tailored for motility, invasion and egress. Gliding is powered by actomyosin-dependent rearward translocation of apically secreted transmembrane adhesins. In the human parasite Toxoplasma gondii, the conoid, composed of tubulin fibres and preconoidal rings (PCRs), is a dynamic organelle of undefined function. Here, using ultrastructure expansion microscopy, we established that PCRs serve as a hub for glideosome components including Formin1. We also identified components of the PCRs conserved in Apicomplexa, Pcr4 and Pcr5, that contain B-box zinc-finger domains, assemble in heterodimer and are essential for the formation of the structure. The fitness conferring Pcr6 tethers the PCRs to the cone of tubulin fibres. F-actin produced by Formin1 is used by Myosin H to generate the force for conoid extrusion which directs the flux of F-actin to the pellicular space, serving as gatekeeper to control parasite motility.
Topics: Humans; Actins; Cytoskeleton; Protozoan Proteins; Toxoplasma; Tubulin; Apicomplexa
PubMed: 36109645
DOI: 10.1038/s41564-022-01212-x