LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 332

Search options

  1. Article: Age Estimation in Brazilian Adults Using the Pulp/Tooth Ratio of the Maxillary Canine and Mandibular Second Premolar.

    Nery-Neto, Ismar / Guedes, Orlando Aguirre / Estrela, Lucas Rodrigues de Araújo / Cintra, Luciano Tavares Angelo / Estrela, Cyntia Rodrigues de Araújo / Estrela, Carlos

    Diagnostics (Basel, Switzerland)

    2024  Volume 14, Issue 7

    Abstract: 1) Background/Objectives: Accurate determination of chronological age is crucial in legal dental identification. This study aimed to compare the effectiveness of different formulas in estimating the age of a Brazilian subpopulation by analyzing the pulp/ ...

    Abstract (1) Background/Objectives: Accurate determination of chronological age is crucial in legal dental identification. This study aimed to compare the effectiveness of different formulas in estimating the age of a Brazilian subpopulation by analyzing the pulp/tooth ratio of the maxillary canine and mandibular second premolar in panoramic and periapical radiographs. (2) Methods: The sample consisted of panoramic and periapical radiographs of 247 individuals. The file of each radiograph was opened in the Adobe Photoshop CS4
    Language English
    Publishing date 2024-03-31
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662336-5
    ISSN 2075-4418
    ISSN 2075-4418
    DOI 10.3390/diagnostics14070749
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article: Spatial Position and Anatomical Characteristics Associated with Impacted Third Molars Using a Map-Reading Strategy on Cone-Beam Computed Tomography Scans: A Retrospective Analysis.

    Lima, Djalma Maciel de / Estrela, Cyntia Rodrigues de Araújo / Bernardes, Cristiane Martins Rodrigues / Estrela, Lucas Rodrigues de Araújo / Bueno, Mike Reis / Estrela, Carlos

    Diagnostics (Basel, Switzerland)

    2024  Volume 14, Issue 3

    Abstract: 1) Background: This study assessed the spatial position and anatomical features associated with impacted third molars through a map-reading strategy employing cone-beam computed tomography (CBCT). (2) Methods: The positioning of impacted third molars on ...

    Abstract (1) Background: This study assessed the spatial position and anatomical features associated with impacted third molars through a map-reading strategy employing cone-beam computed tomography (CBCT). (2) Methods: The positioning of impacted third molars on CBCT was assessed using Winter's and Pell and Gregory's classifications. External root resorption in mandibular second molars was categorized according to Herman's classification. Additionally, the relationship between the mandibular third molar root apex and the mandibular canal was examined. Comparative statistical analysis was conducted using Fisher's exact test, with a significance level considered as 5%. (3) Results: The results indicated that, based on Winter's classification, 48.06 % of impacted teeth were positioned mesioangularly. Employing Pell and Gregory's classification, 43.22% of the impacted molars fell into positions B and C, with 54.2% classified as Class II. A notable 69.7% of teeth exhibited no contact between the root apex and the mandibular canal, and external root resorption in the distal aspect of the second molar was absent in 88.7% of cases. (4) Conclusions: Utilizing the map-reading strategy with CBCT scans to assess the anatomical positions and characteristics of impacted third molars enhances professional confidence and sets a standard for quality and safety in the surgical procedure for patients.
    Language English
    Publishing date 2024-01-25
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662336-5
    ISSN 2075-4418
    ISSN 2075-4418
    DOI 10.3390/diagnostics14030260
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Association between odontogenic conditions and maxillary sinus abnormalities.

    Panzarella, Francine Kühl / Coelho, Marcelo Santos / Estrela, Carlos

    Annals of palliative medicine

    2023  Volume 12, Issue 5, Page(s) 887–890

    MeSH term(s) Humans ; Maxillary Sinus ; Retrospective Studies
    Language English
    Publishing date 2023-06-20
    Publishing country China
    Document type Editorial
    ZDB-ID 2828544-X
    ISSN 2224-5839 ; 2224-5839
    ISSN (online) 2224-5839
    ISSN 2224-5839
    DOI 10.21037/apm-23-338
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: A computational modeling method for root canal endoscopy using a specific CBCT filter: A new era in the metaverse of endodontics begins.

    Bueno, Mike R / Estrela, Carlos

    Brazilian dental journal

    2022  Volume 33, Issue 4, Page(s) 21–30

    Abstract: A contemporary technological revolution has started a new era in the metaverse of Endodontics, a world of virtual operational possibilities that use an exact replica of the natural structures of the maxillofacial complex. This study describes a modeling ... ...

    Abstract A contemporary technological revolution has started a new era in the metaverse of Endodontics, a world of virtual operational possibilities that use an exact replica of the natural structures of the maxillofacial complex. This study describes a modeling method for root canal endoscopy using modern cone-beam CT (CBCT) software in a series of clinical cases. The method consists in acquiring thin CBCT slices (0.10mm) in the coronal, sagittal, and axial planes. A specific 3D volume filter, the pulp cavity filter of the e-Vol DX CBCT software, was used to navigate anatomical root canal microstructures, and to scan them using root canal endoscopy. The pulp cavity filter should be set to synchronize CBCT scans from 2D mode - multiplanar reformations (MPR) - to 3D mode - volumetric reconstruction. This filter, when adopting the option of volumetric reconstruction, the developed algorithm leaves the dentin density in transparent mode so that the pulp cavity may be visualized. The algorithm applied performs the suppression (visual) of areas with dentin density. This ensures 3D visualization of the slices and the microanatomy of the root canal, as well as a dynamic navigation throughout the pulp cavity. This computational modeling method adds new resources to Endodontics, which may impact the predictability of root canal treatments positively. The virtual visualization of the internal anatomy of an exact replica of the canal ensures better communications, reliability, and clinical operationalization. Root canal endoscopy using this novel CBCT filter may be used for clinical applications together with innovative digital and virtual-reality resources that will be naturally incorporated into the principles of Endodontics.
    MeSH term(s) Computer Simulation ; Cone-Beam Computed Tomography/methods ; Dental Pulp Cavity/anatomy & histology ; Dental Pulp Cavity/diagnostic imaging ; Endodontics/methods ; Endoscopy ; Reproducibility of Results ; Root Canal Therapy/methods ; Spiral Cone-Beam Computed Tomography
    Language English
    Publishing date 2022-08-31
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 1089484-6
    ISSN 1806-4760 ; 0103-6440
    ISSN (online) 1806-4760
    ISSN 0103-6440
    DOI 10.1590/0103-6440202205078
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Clinical Differential Diagnosis between Nonodontogenic and Endodontic Radiolucent Lesions in Periapical Location: A Critical Review.

    Pimenta Carvalho, Stephany / Estrela, Carlos / Franco, Eneida Vêncio

    Iranian endodontic journal

    2023  Volume 16, Issue 3, Page(s) 150–157

    Abstract: In endodontics, accurate diagnoses are important for the selection of appropriate and successful therapy. Several nonendodontic entities in periapical location may resemble those of inflammatory endodontic origin and impact therapeutic approaches. The ... ...

    Abstract In endodontics, accurate diagnoses are important for the selection of appropriate and successful therapy. Several nonendodontic entities in periapical location may resemble those of inflammatory endodontic origin and impact therapeutic approaches. The aim of this study was to review noninflammatory entities mimicking dentoalveolar abscesses or apical periodontitis and to discuss clinical and pathological features. In this review study, the authenticated search engine in PubMed (MEDLINE) database was used to find articles by using "Nonvital Pulp Dentoalveolar Abscess", "Nonvital Pulp And Apical Periodontitis", "Periapical Abscess", "Chronic Dentoalveolar Abscess", "Chronic Apical Periodontitis", "Periapical Granuloma", And "Radicular Cyst". Each of these predefined keywords were combined with the terms "Misdiagnosed", "Mimicking", "Masquerading", or "Simulating" to search for reported cases indexed from 1978 to 2020. All case reports fulfilling the selection criteria were reviewed to identify radiolucent nonendodontic periapical lesions focused on the questions: "Which pathological entities mimick radiolucent endodontic lesions in periapical location? Based on endodontic clinical parameters, what are the contrasting features?" Out of 426 articles, 111 were relevant to the subject, including a series of cases and case reports. Only well-documented English and recent papers were considered. A total of 30 noninflammatory entities appeared clinically as radiolucent endodontic lesion in periapical location. Lesions simulating chronic apical periodontitis represented 83.3% and dentoalveolar abscess 16.7%. Interestingly, primary malignancies and metastasis counted 43.3% and pain was a typical symptom. Swelling was a noncontributory clinical feature in distinguishing periapical lesions. Lack of pulp response was registered in 68.4% of nonedodontic lesions. A flowchart was generated to summarize clinicopathological aspects of radiolucent nonendodontic entities appearing as dentoalveolar abscesses or apical periodontitis In relation to clinical practice, it is very important for us to note that, a group of pathological entities may simulate radiolucencies of endodontic origin in periapical location, especially malignancies and non-inflammatory odontogenic lesions.
    Language English
    Publishing date 2023-01-20
    Publishing country Iran
    Document type Journal Article ; Review
    ZDB-ID 2684659-7
    ISSN 2008-2746 ; 2008-2746
    ISSN (online) 2008-2746
    ISSN 2008-2746
    DOI 10.22037/iej.v16i3.32572
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Method to Identify Accessory Root Canals using a New CBCT Software.

    Bueno, Mike Reis / Azevedo, Bruno Correa / Estrela, Cyntia Rodrigues de Araújo / Sousa-Neto, Manoel Damião / Estrela, Carlos

    Brazilian dental journal

    2022  Volume 32, Issue 6, Page(s) 28–35

    Abstract: This study describes a methodology to identify accessory root canals using the e-Vol DX software in CBCT scans. Accessory root canals are strategic shelters for microorganisms present in root canal infections. The identification of these small canals in ... ...

    Abstract This study describes a methodology to identify accessory root canals using the e-Vol DX software in CBCT scans. Accessory root canals are strategic shelters for microorganisms present in root canal infections. The identification of these small canals in periapical radiographic exams has limitations, besides being markedly limited accessibility to the action of endodontic instruments and to the antimicrobial agents. A significant number of accessory canals have sufficient diameters to be visible on cone-beam computed tomography (CBCT) images of high spatial resolution. Therefore, it may go unnoticed or even confused when there is no specific training for this type of diagnosis. The methodology consists in establishing thin slices (0.1mm or smaller) obtained from coronal, sagittal and axial slices. The method consists of the following steps: during navigation along the long axis of a root canal when finding a possible hypodense line of main root canal in a tomographic section (axial, sagittal or coronal), the navigation software lines of the multiplanar reconstruction (MPR) must be adjusted so that they are parallel and perpendicular to the hypodense line (parallax correction). Then, after judiciously adjusted, the accessory canal image will invariably appear as a line on one of the MPR tomographic slices, another line on another slice, and a dot on the third slice. The three sections of the MPR present images with the "line-line-dot" sequence. In this way, it is possible to identify an accessory root canal and also visualize it in volumetric reconstruction in a specific filter. The application of this method is easy to employed and may benefit the diagnosis when you want to visualize accessory root canals and distinguish it from root fracture line.
    MeSH term(s) Cone-Beam Computed Tomography ; Dental Pulp Cavity/diagnostic imaging ; Root Canal Therapy ; Software ; Spiral Cone-Beam Computed Tomography
    Language English
    Publishing date 2022-01-07
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 1089484-6
    ISSN 1806-4760 ; 0103-6440
    ISSN (online) 1806-4760
    ISSN 0103-6440
    DOI 10.1590/0103-6440202104741
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Method to determine the root canal spatial geometry using an algorithm of the e-Vol DX CBCT software.

    Estrela, Carlos / Bueno, Mike Reis / Rossi-Fedele, Giampiero / Decurcio, Daniel Almeida / Guedes, Orlando Aguirre / Sousa-Neto, Manoel Damião / Estrela, Cyntia Rodrigues de Araújo

    Brazilian dental journal

    2023  Volume 34, Issue 6, Page(s) 40–49

    Abstract: This study evaluated a method to determine the spatial geometry of root canal preparation (RCP) using navigation dynamics and a specific algorithm from a new CBCT software (e-Vol DX). CBCT scans of 168 root canals of mandibular molars were acquired ... ...

    Abstract This study evaluated a method to determine the spatial geometry of root canal preparation (RCP) using navigation dynamics and a specific algorithm from a new CBCT software (e-Vol DX). CBCT scans of 168 root canals of mandibular molars were acquired before and after RCP, using nickel-titanium (NiTi) instruments (ProTaper Next, BioRace, Reciproc Blue, and WaveOne Gold). The spatial geometry of the root canals and the operative risk of disproportional wear of dentinal walls after RCP were evaluated using a new CBCT software. A 3-point scoring system was used after the measuring of cementum/dentin thickness before and after RCP in all root thirds. The root thirds were distributed into three parts of similar sizes, and the scores were categorized at three levels: 1. mild risk (1/3), 2. moderate risk (2/3), 3. severe risk (3/3). These levels were proposed according to the risk of creating disproportionate shapes, thin walls, or perforations. The data were analyzed statistically by Fischer's exact test (α = 5%). There were no significant differences in operative risk among the NiTi engine-driven systems, for the distal or mesial walls of all the root canal thirds (p>0.05). The spatial geometry method to assess operative risk allows clinical planning for a predictable enlargement of the root canal in all root thirds. Based on using a map-reading strategy on root canals in CBCT scans, NiTi engine-driven instruments did not present an increased operative risk during RCPs.
    MeSH term(s) Dental Pulp Cavity ; Dental Alloys ; Spiral Cone-Beam Computed Tomography ; Dentin ; Root Canal Preparation ; Titanium ; Algorithms ; Software ; Equipment Design
    Chemical Substances Dental Alloys ; nitinol (2EWL73IJ7F) ; titanium nickelide (12035-60-8) ; Titanium (D1JT611TNE)
    Language English
    Publishing date 2023-12-15
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 1089484-6
    ISSN 1806-4760 ; 0103-6440
    ISSN (online) 1806-4760
    ISSN 0103-6440
    DOI 10.1590/0103-6440202305661
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Structural and torque changes in implant components of different diameters subjected to mechanical fatigue.

    Dos Santos, Renan Brandenburg / Lenz, Ulysses / Griggs, Jason Alan / Estrela, Carlos / Bueno, Mike Dos Reis / Porto, Olavo Cesar Lyra / Della Bona, Alvaro

    Dental materials : official publication of the Academy of Dental Materials

    2024  Volume 40, Issue 3, Page(s) 493–499

    Abstract: Objectives: To evaluate torque maintenance and structural damage in implant components of different diameters subjected to a fatigue challenge.: Methods: Thirty 10-mm-long, morse taper connection, titanium dental implants and their corresponding one- ... ...

    Abstract Objectives: To evaluate torque maintenance and structural damage in implant components of different diameters subjected to a fatigue challenge.
    Methods: Thirty 10-mm-long, morse taper connection, titanium dental implants and their corresponding one-piece abutments were divided into three groups (n = 10) according to implant diameter: 4.3 mm (I4.3), 3.5 mm (I3.5), and 2.9 mm (I2.9). The implants were placed into a load-bearing fixture simulating bone tissue (modified G10), and the abutments were screwed into the implants to a final torque of 20 Ncm for the I4.3 and I3.5 and 15 Ncm for I2.9. The torque was secured by a digital torque meter. Cone-beam computed tomography (CBCT) scans were acquired and post-processed (e-Vol DX software) for all implant/abutment sets before and after subjecting them to fatigue in 37 °C distilled water (2 million cycles, constant load and frequency). The removal torque was measured using the same digital torque meter to calculate the difference in torque before and after fatigue.
    Results: I2.9 showed substantial structural deformation compared with the other implant diameters (I3.5 and I4.3). However, the experimental groups did not show statistical differences for abutment loosening.
    Significance: Implants smaller than 3.5 mm in diameter have a higher probability of structural deformation than standard-diameter implants. The association between tomographic scans and e-Vol DX software showed satisfactory consistency with the direct assessment using the digital torque meter, offering an additional tool to evaluate implant component loosening and structural deformations.
    MeSH term(s) Dental Implants ; Dental Implant-Abutment Design ; Torque ; Dental Abutments ; Dental Stress Analysis
    Chemical Substances Dental Implants
    Language English
    Publishing date 2024-01-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 605995-8
    ISSN 1879-0097 ; 0109-5641
    ISSN (online) 1879-0097
    ISSN 0109-5641
    DOI 10.1016/j.dental.2023.12.014
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Surface wear and adhesive failure of resin attachments used in clear aligner orthodontic treatment.

    Fausto da Veiga Jardim, Alexandre / Curado de Freitas, Jairo / Estrela, Carlos

    Journal of orofacial orthopedics = Fortschritte der Kieferorthopadie : Organ/official journal Deutsche Gesellschaft fur Kieferorthopadie

    2023  

    Abstract: Purpose: This study evaluated adhesive and cohesive failures and the surface wear of attachments employed in clear aligner treatment (CAT) using three-dimensional (3D) superimposition.: Methods: In all, 3D models of 150 teeth were obtained from ... ...

    Title translation Oberflächenabnutzung und Adhäsionsversagen von für die kieferorthopädische Behandlung mit Clear Alignern verwendeten Attachments aus Kunststoff.
    Abstract Purpose: This study evaluated adhesive and cohesive failures and the surface wear of attachments employed in clear aligner treatment (CAT) using three-dimensional (3D) superimposition.
    Methods: In all, 3D models of 150 teeth were obtained from intraoral scans from patients undergoing CAT with at least 4 months between each scan. Of the initial sample, 25 teeth were discarded, and 125 teeth were included in the study. Superimpositions of each individual tooth at the first and second time points were made using computer-aided design (CAD) software (Meshmixer; Autodesk, Mill Valley, CA, USA). Analyses were performed to compare surface wear and failures related to type of attachment (optimized/conventional), dental group (molars/premolars/anterior teeth), and arch (mandibular/maxillary). Mann-Whitney and Kruskal-Wallis statistical tests were applied with significance set at 5%.
    Results: More surface wear was observed in conventional attachments, mandibular and anterior teeth with statistical significance for surface wear on the distal surface of conventional attachments (p < 0.05). Cohesive failure was observed in 10% of attachments, occurring most frequently on optimized attachments and molar teeth. Adhesive failure was observed in 10% of the samples, more frequently on conventional attachments and posterior teeth.
    Conclusion: Attachment type (conventional vs. optimized) was significantly correlated with surface wear on the distal surface of the attachment. Arch (mandibular or maxillary) and group of teeth (anterior or posterior) showed no correlation with surface wear. Failure, both adhesive and cohesive, correlated with attachment type and group of teeth, but not with the arch in which they were located.
    Language English
    Publishing date 2023-06-14
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1309470-1
    ISSN 1615-6714 ; 0015-816X ; 1434-5293
    ISSN (online) 1615-6714
    ISSN 0015-816X ; 1434-5293
    DOI 10.1007/s00056-023-00471-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: Comparison of Curvature Severity Between Sagittal and Coronal Planes of Mesiobuccal Canals in Permanent Maxillary First Molars Using Multiple Complexity-risk Criteria: A CBCT Cross-sectional Study of a Brazilian Subpopulation.

    Wu, Lee / Ha, William Nguyen / Decurcio, Daniel Almeida / Estrela, Carlos / Rossi-Fedele, Giampiero

    Journal of endodontics

    2023  Volume 49, Issue 12, Page(s) 1682–1689.e4

    Abstract: Introduction: This study aimed to compare the curvature severity of mesio-buccal (MB) canals between sagittal and coronal planes using cone-beam computed tomography.: Methods: In a Brazilian subpopulation, untreated MB1 (n = 141) and MB2 (n = 72) ... ...

    Abstract Introduction: This study aimed to compare the curvature severity of mesio-buccal (MB) canals between sagittal and coronal planes using cone-beam computed tomography.
    Methods: In a Brazilian subpopulation, untreated MB1 (n = 141) and MB2 (n = 72) with single curvatures in sagittal and coronal planes were measured to determine their angle and radius (r), plus the prevalence of S-shaped canals was recorded. Curvature severity was defined according to the American Association of Endodontists Case Difficulty Assessment form (AAE) and EndoApp (EA), as well as their modified versions that consider angle and radii (AAE-r, EA-r). Data were converted into mean angle and r, percentage of canals >30°, AAE, EA, AAE-r and EA-r categories. The influence of r on case severity was assessed. Statistical analysis was performed using t-tests and chi-squared tests. The level of significance was set as P ≤ .05.
    Results: For single curvatures, significantly higher mean degrees (SD) angles were found in the sagittal views in both canals (MB1 sagittal: 35 [11]; MB1 coronal: 13 [13]; MB2 sagittal: 29 [14]; MB2 coronal: 22 [15] [P < .05]). A greater percentage of angles >30° (MB1: 56.7% vs 6.4%; MB2: 44.4% vs 22.2%) in sagittal planes compared to coronal planes was also found. Conversely, a higher prevalence of S-shaped canals (MB1: 33.3% vs 7.1% MB2: 31.9% vs 15.3%) was observed in coronal planes. Significant differences between AAE and AAE-r were present with greater case severity when radii were considered (P < .05).
    Conclusions: Sagittal planes were associated with more severe single curvatures, while coronal planes had a greater prevalence of S-shaped canals.
    MeSH term(s) Cross-Sectional Studies ; Brazil ; Spiral Cone-Beam Computed Tomography ; Dental Pulp Cavity/diagnostic imaging ; Molar/diagnostic imaging ; Cone-Beam Computed Tomography/methods
    Language English
    Publishing date 2023-10-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 752412-2
    ISSN 1878-3554 ; 0099-2399
    ISSN (online) 1878-3554
    ISSN 0099-2399
    DOI 10.1016/j.joen.2023.09.015
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top