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1.
Rev. ADM ; 78(3): 135-141, mayo-jun. 2021. ilus, tab, graf
Article in Spanish | LILACS | ID: biblio-1254493

ABSTRACT

Se presentan los casos de fracturas verticales sintomáticos que ameritaron la extracción de las órganos dentales afectados en un periodo de cinco meses durante la pandemia por COVID-19 en la ciudad de Chihuahua, México. Material y métodos: Se recolectaron 26 muestras para el estudio, proporcionadas por los cirujanos dentistas integrantes del Grupo de Egresados de la Facultad de Odontología de la Universidad Autónoma de Chihuahua. Resultados: Los resultados muestran diferencias a lo reportado previamente respecto al tipo de diente involucrado, sexo de los pacientes, restauraciones coronales y tratamientos endodóncicos previos. Conclusiones: Se puede suponer que las modificaciones en el estilo de vida de la población, sumadas a la angustia permanente, pueden ser factores que contribuyen a las fracturas dentales (AU)


There are cases of symptomatic vertical fractures that warranted the extraction of affected teeth are presented, over a period of five months during the COVID-19 pandemic in Chihuahua City, Mexico. Material and methods: 26 samples were collected for the study, provided by the dentist who were members of the Graduate Group of the Faculty of Dentistry of the Autonomous University of Chihuahua. Results: The results show differences from what was previously reported regarding the type of tooth involved, sex of patients, coronal restorations and previous endodontic treatments. Conclusions: It can be assumed that changes in the lifestyle of the population, added to permanent distress, may be factors to preserve dental fractures (AU)


Subject(s)
Tooth Fractures/epidemiology , Tooth Root/injuries , Coronavirus Infections , COVID-19 , Root Canal Therapy/statistics & numerical data , Schools, Dental , Bicuspid , Dental Fissures/epidemiology , Photomicrography , Statistical Analysis , Post and Core Technique/statistics & numerical data , Tooth Crown/injuries , Dental Restoration, Permanent/statistics & numerical data , Age and Sex Distribution , Mexico/epidemiology , Molar
2.
Article in English | WPRIM | ID: wpr-880861

ABSTRACT

Tooth root morphogenesis involves two biological processes, root elongation and dentinogenesis, which are guaranteed by downgrowth of Hertwig's epithelial root sheath (HERS) and normal odontoblast differentiation. Ubiquitin-dependent protein degradation has been reported to precisely regulate various physiological processes, while its role in tooth development is still elusive. Here we show ubiquitin-specific protease 34 (USP34) plays a pivotal role in root formation. Deletion of Usp34 in dental mesenchymal cells leads to short root anomaly, characterized by truncated roots and thin root dentin. The USP34-deficient dental pulp cells (DPCs) exhibit decreased odontogenic differentiation with downregulation of nuclear factor I/C (NFIC). Overexpression of NFIC partially restores the impaired odontogenic potential of DPCs. These findings indicate that USP34-dependent deubiquitination is critical for root morphogenesis by stabilizing NFIC.


Subject(s)
Cell Differentiation , Female , Morphogenesis , NFI Transcription Factors , Odontogenesis , Tooth Root
3.
Arq. odontol ; 57: 199-207, jan.-dez. 2021. ilus, tab
Article in Portuguese | LILACS, BBO | ID: biblio-1348086

ABSTRACT

Objetivo: Comparar o aumento percentual da área da secção reta transversal de canais radiculares, no nível de 3 mm aquém do ápice radicular, após instrumentação com dois sistemas de instrumento único. Métodos: Dezenove primeiros molares inferiores extraídos tiveram as raízes mesiais seccionadas no nível de 3 mm aquém do ápice radicular, sendo os 2 milímetros finais de cada raiz removidos e descartados, para proceder a mensuração da área pré-operatória, através de estereomicroscopia. As raízes foram instrumentadas com os sistemas SAF e Reciproc R25.08 e procedeu-se nova mensuração para comparação do aumento percentual da área. O aumento percentual da área da secção reta transversal foi comparado e analisado estatisticamente pelo teste t de Student. O nível de significância foi estabelecido em 5% (p < 0,05). Resultados: O aumento percentual da área dos canais foi significativamente maior para o grupo Reciproc (p = 0,001) em comparação com o grupo SAF. Os canais instrumentados com o sistema SAF tiveram sua área aumentada em média 53,5%, enquanto que nos instrumentados com o sistema Reciproc a média foi 154,5%. Conclusão: O sistema Reciproc proporcionou um aumento percentual da área da secção reta transversal dos canais radiculares, no nível dos 3 mm apicais, 3 vezes maior que o sistema SAF.


Aim: To compare the percentage increase in the cross-sectional area of root canals, at the level of 3 mm from the root apex after instrumentation with two single instrument systems. Methods: The roots of 19 extracted mandibular first molars were sectioned 3 mm short of the apex level, with the final 2 millimeters of each root removed and discarded in order to enable the preoperative area to be measured by stereomicroscopy. Subsequently, the roots were instrumented with the SAF and Reciproc 25/.08 systems, alternating the technique used per canal from root to root, and a new measurement was performed. After, the percentage increase in area was calculated considering the values of the original and the final area. The Student'st-test was applied to the results, with a level of significance set at 5%. Results: The percentage increase in area of the root canals was significantly higher for the Reciproc (p = 0.001) when compared to the SAF group. In the canals instrumented with the SAF system, the mean increase in area was 53.5%, while in those using the Reciproc system, it was 154.5%. Conclusion:The Reciproc system produced a 3-fold higher percentage increase in the cross-sectional area of the root canals at the level of 3 mm from the root apex than did the SAF system.


Subject(s)
Tooth Root , Root Canal Preparation , Dental Pulp Cavity , Endodontics , Dental Instruments
4.
Rev. Ateneo Argent. Odontol ; 64(1): 13-17, 2021. ilus
Article in Spanish | LILACS | ID: biblio-1248251

ABSTRACT

Se presenta un caso clínico de fractura radicular del tercio medio, de pieza 2.1 con desplazamiento de los cabos de fractura. Es tratado con un novedoso procedimiento terapéutico, mediante la utilización de un biomaterial de tercera generación osteoconductor, osteogénico y osteoinductor. Se obtiene la reparación del tejido conectivo interproximal y la formación de tejido calcificado (AU)


We present a clinical case of root fracture of the middle third, piece 2.1 with displacement of the fracture ends. It is treated with a novel therapeutic procedure, using a thirdgeneration osteoconductive, osteogenic and osteoinductive biomaterial. Interproximal connective tissue repair and calcified tissue formation are obtained (AU)


Subject(s)
Humans , Male , Adolescent , Tooth Fractures/therapy , Tooth Root/injuries , Biocompatible Materials , Regenerative Endodontics/methods , Osteogenesis , Root Canal Obturation/instrumentation , Tooth Root/diagnostic imaging , Wound Healing/physiology , Dental Fistula/radiotherapy , Dentition, Permanent
5.
Braz. oral res. (Online) ; 35: e080, 2021. graf
Article in English | LILACS, BBO | ID: biblio-1278598

ABSTRACT

Abstract: 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. The cervical and middle thirds of root canals were instrumented with Reciproc R25, and the K#15 file was used as a standard instrument to determine working length, forming 2 groups: Constriction (insertion of the instrument until the apical constriction limit) and Foramen (insertion of the instrument until the foramen and then repositioning at constriction, without removing the file from the canal). The hand file was stabilized with a light-cured flow resin. After extraction, the samples were analyzed through microCT SkyScan 1272, with CTAN software, which evaluated the proximity between the tip of the file to the apical constriction, providing data for comparative analysis using Kruskal-Wallis and Dunn tests (p<0.05). There was a statistically significant difference in the abilities of the EALs to detect the apical constriction after reaching the foramen with Root ZX II showing higher accuracy (89%). However, there was no difference in the accuracy of the three EALs in detecting the apical constriction without reaching the foramen. Based on the present results, we conclude that EALs may show accurate measures in detecting apical constriction and foramen, even without damaging the periodontal stump in biopulpectomy.


Subject(s)
Tooth Apex/diagnostic imaging , Dental Pulp Cavity , Tooth Root , Root Canal Preparation , X-Ray Microtomography , Odontometry
6.
Braz. oral res. (Online) ; 35: e060, 2021. tab, graf
Article in English | LILACS, BBO | ID: biblio-1249378

ABSTRACT

Abstract: This study aimed to describe the morphometric relationship of root canal orifices on the pulp floor in the presence/absence of mesiobuccal second canal (MB2) in the maxillary first molars and other aspects of its internal anatomy. Sixty-two maxillary first molars were scanned by micro-CT. The presence of the MB2 canal was verified. The distance between the center points of the MB1, MB2, distobuccal (DB), and palatal (P) canal orifices on the pulp floor were measured (MB1-MB2, MB1-DB, MB2-DB, MB1-P, and DB-P). The MB1-P to DB-P ratio was calculated. The distances between the anatomic apex and the MB1 and MB2 apical foramina were measured. The length of the band-shaped isthmus was also measured. Student's t-test was applied to verify the association between the presence of an MB2 canal, the interorifice distances, and the ratio of the MB1-P to DB-P distance (α = 5%). The MB2 canal was present in 43 roots (69.35%). Statistics showed significant differences when MB2 was present for the largest MB1-P distance (p < 0.05) and higher values for the MB1-P to DB-P ratio (p < 0.05). A band-shaped isthmus was detected in 25.8% of MB roots. The mean distance from the apical foramen to the isthmus floor ranged from 1.74 for MB1 canals to 1.42 for MB2 canals. Canal orifice distances on the pulp floor may predict the presence of MB2 canals. There was a high incidence of isthmus, accessory canals, and apical delta in the critical apical zone in MB roots of maxillary first molars.


Subject(s)
Tooth Root/diagnostic imaging , Maxilla/diagnostic imaging , Dental Pulp Cavity/diagnostic imaging , X-Ray Microtomography , Molar/diagnostic imaging
7.
Braz. oral res. (Online) ; 35: e29, 2021. tab, graf
Article in English | LILACS, BBO | ID: biblio-1153613

ABSTRACT

Abstract This study evaluated how Er,Cr:YSGG laser, associated or not with 5% fluoride varnish, influences the surface roughness and volume loss of bovine root dentin submitted to erosive and/or abrasive wear. One hundred and twenty dentin specimens were divided into the groups: without preventive treatment (WPT), 5% fluoride varnish (FV); Er,Cr:YSGG laser irradiation (L), and varnish combined with laser (FV + L). The specimens (n = 10) were subdivided into: 1 = erosion (E); 2 = abrasion (A); and 3 = erosion followed by abrasion (E + A). The erosive solution used was a soft-drink (pH = 2.42 at 4ºC) applied in 5-min cycles twice a day for 10d. Abrasive wear involved brushing for 60s with an electric brush (1,600-oscillations/s) at a load of 2.0N. Surface roughness and volume loss were evaluated using a laser scanning confocal microscope. Roughness data were submitted to one-way ANOVA and Tukey post-hoc test. For volume loss, the Kruskal-Wallis and Dunn's post-hoc tests were used (α = 5%). The lowest values of roughness were found in the control areas of all subgroups (p > 0.05). In the experimental area, the [(WPT) + (E+A)] subgroup had a significantly higher roughness (5.712 ± 0.163 μm 2 ) than the other subgroups (p < 0.05). The L and (FV + L) groups had statistically similar roughness, regardless of the type of wear. The (FV + L) group had the lowest volume loss, regardless of the type of wear performed: [(FV + L) + (E)] = 7.5%, [(FV + L) + (A) = 7.3%, and [(FV + L) + (E + A)] = 8.1%. The subgroup [(WPT) + (E + A)] had the highest volume loss (52.3%). The proposed treatments were effective in controlling dentin roughness. Laser irradiation can be an effective method to increase root dentin resistance after challenges and limit problems related to non-carious lesions.


Subject(s)
Animals , Cattle , Tooth Erosion/etiology , Lasers, Solid-State/therapeutic use , Tooth Root , Toothbrushing , Dentin , Fluorides
8.
Braz. oral res. (Online) ; 35: e022, 2021. tab, graf
Article in English | LILACS, BBO | ID: biblio-1153612

ABSTRACT

Abstract This study aimed to determine the mean distances between apexes of the maxillary posterior teeth and the maxillary sinus, between apexes of the mandibular posterior teeth and the mandibular canal, and between the root apexes of all teeth and the adjacent cortical plates. A total of 800 cone-beam computed tomography (CBCT) scans (400 maxillary and 400 mandibular) were obtained from patients indicated for several treatments. The proximity between apexes and anatomical structures, and the relationship between apexes and adjacent cortical plates were assessed together with the risk of over-instrumentation. Paired-sample comparisons were performed by using the paired t-test. The means were compared by ANOVA, Kruskal-Wallis and Dwass-Steel-Critchlow-Fligner tests. a) Most of the apexes classified as A (high-risk proximity) were observed in maxillary first and second molars, in mandibular first and second molars, and in second premolars in relation to near anatomical structures. b) A predominance of class A (86.42%) was noticed in the first premolars, between apexes of maxillary teeth and adjacent cortical plates. c) The distance between apexes of mandibular teeth and buccal cortical plates showed a predominance of medium-risk proximity (B) in all the groups, except the first premolars, with the highest risk (82.22%), and the second molars, with low-risk proximity (C) to distal and mesiobuccal apexes (91.77% and 89.62%). CBCT images are important for endodontic diagnosis and treatment, since many teeth have high risk proximity to near anatomical structures and adjacent cortical plates.


Subject(s)
Humans , Maxillary Sinus , Tooth Root/diagnostic imaging , Cerebral Cortex , Cone-Beam Computed Tomography , Molar/diagnostic imaging
9.
Braz. oral res. (Online) ; 35: e065, 2021. tab, graf
Article in English | LILACS, BBO | ID: biblio-1249364

ABSTRACT

Abstract: Maxillary and mandibular incisors have increased risk for severe orthodontically induced inflammatory root resorption. A patient-related risk factor is aberrant root morphology. This study aimed to assess the frequency of detection of different root morphologies in anterior teeth using dental panoramic tomography (DPT) and long cone periapical radiographs (LCPAs). A retrospective cross-sectional design was used to assess a sample of 50 consecutive pre-treatment radiographic records of patients from a specialist orthodontic practice in Adelaide, Australia. A reference guide was developed that included three previously unreported morphologies: pipette and bent, bent and pointed, bent and blunt. Two trained and calibrated assessors examined each record against the inclusion criteria, then independently assessed each anterior tooth from DPTs and LCPAs to detect the type of root morphology present. Data were analysed using the chi-square statistical test. Radiographic records for 48 patients (48 DPTs and 161 LCPAs) were eligible, with 355 and 426 teeth on DPTs and LCPAs, respectively, included for assessment. Normal root morphology (119 teeth) was commonly observed in DPTs, while bent (154 teeth) was frequently observed using LCPAs. Mandibular incisors often had normal morphology in DPTs but bent in LCPAs. Bent was the most common morphology in maxillary lateral incisors using DPT and LCPAs, although maxillary centrals were mostly normal in DPTs but pointed in LCPAs. Differences using the two image acquisition methods were highly significant (p < 0.01). Aberrant root morphologies are more easily detected in anterior teeth using LCPAs compared to DPTs.


Subject(s)
Humans , Root Resorption/diagnostic imaging , Tooth Root/diagnostic imaging , Radiography, Panoramic , Cross-Sectional Studies , Retrospective Studies , Maxilla
10.
Article in English | WPRIM | ID: wpr-878443

ABSTRACT

OBJECTIVES@#The effect of Vps4b gene mutation on the expressions of cytokeratin 14 (CK14) and proliferating cell nuclear antigen (PCNA) in the Hertwig's epithelial root sheath (HERS) is investigated.@*METHODS@#The bilateral mandibular tissues of mouse on postnatal days 5, 9, 11, 15, and 19 were removed. The mandibular first molar tissue sections were obtained after paraffin embedding. The CK14 and PCNA expressions in the epithelial root sheath of the normal mouse and Vps4b knockout mouse were compared through immunohistochemistry.@*RESULTS@#On postnatal day 5, the normal mouse began to form HERS and had a strong positive PCNA expression in the HERS cells; on postnatal day 9, the HERS structure was continuous, and PCNA was positive in the HERS cells; on postnatal day 11, a small portion of HERS began to break, and PCNA was weakly positive in the HERS cells; on postnatal day 15, HERS continued to fracture; PCNA was weakly and positively expressed in the HERS cells on the root surface; on postnatal day 19, the tooth root reached normal physiological length, and PCNA was positively expressed in the HERS cells of the terminal part. Similar to the normal mouse, the gene knockout mouse also formed a HERS structure on postnatal day 5. However, HERS began to break on postnatal day 9. On postnatal day 19, only a few fragments of HERS were found on the root surface, and the root development was immature. Moreover, the expression intensity of PCNA in the gene knockout mouse was decreased.@*CONCLUSIONS@#The Vps4b gene mutation may change the CK14 and PCNA expressions, leading to abnormal root development.


Subject(s)
ATPases Associated with Diverse Cellular Activities , Animals , Endosomal Sorting Complexes Required for Transport , Epithelial Cells , Keratin-14 , Mice , Mice, Knockout , Proliferating Cell Nuclear Antigen , Tooth Root
11.
Rev. Cient. CRO-RJ (Online) ; 5(3): 2-12, Dec. 2020.
Article in English | LILACS | ID: biblio-1337808

ABSTRACT

Introduction: "Molar-incisor malformation" (MIM) or "Molar root-incisor malformation" is a recently reported dental anomaly of unknown etiology, possibly associated with systemic complications, which affects the development of first permanent molar roots and dental enamel of central incisors. Objective: To conduct a literature review on "Molarincisor malformation", also known as "Molar root-incisor malformation", discussing its clinical, radiographic/tomographic and microscopic aspects; differential diagnosis and treatment possibilities. Sources of data: Electronic search was performed on the MEDLINE database in March 2021, without limit regarding the year of publication. The terms used were "molar-incisor malformation", "molar-root incisor malformation", "root malformation", "root development", "tooth roots", "abnormalities". Synthesis of data: Fifteen articles, most of them case series, were included. In general, medical historyrevealed clinical complications during pregnancy and / or the first years of life. Clinical features included tooth enamel defects in the cervical region of incisors and marked mobility of permanent molars and incisors. Radiographically, partially obliterated pulp chambers, short, thin and incomplete roots of first permanent molars and incisors, were observed. Microscopically, the occurrence of a hypercalcified dentin layer, in the form of a lens, inside the pulp chamber, at the level of the cementum-enamel junction, called"mineralized cervical diaphragm", was reported. Conclusion: "Molar-incisor malformation" is an anomaly characterized by changes in root development, pulp chamber and enamel in permanent molars and incisors. The differential diagnosis includes Dentin Dysplasia type I and Regional Odontodysplasia. Medical and familyhistories are essential for the final diagnosis, and treatment, which despite not having an established protocol, requires a multidisciplinary approach and conventional treatments such as tooth extraction, endodontics, orthodontics, and dental implants.


Introdução: "Malformação molar-incisivo" (MIM) ou "Malformação radicular molarincisivo" é uma anomalia dental recém-reportada de etiologia desconhecida, possivelmente associada a complicações sistêmicas, que afeta o desenvolvimento de raízes dos primeiros molares permanentes e esmalte dentário de incisivos centrais. Objetivo: Realizar uma revisão da literatura sobre "Malformação molar incisivo", também conhecida como "Malformação raiz-molar incisivo", discutindo seus aspectos clínicos, radiográficos/tomográficos, diagnóstico diferencial e possibilidades de tratamento. Fonte dos dados: Busca eletrônica foi realizada na base MEDLINE, em março de 2021, sem limite quanto ao ano de publicação. Os termos pesquisados foram "molarincisor malformation", "molar-root incisor malformation", "root malformation", "root development", "tooth roots", "abnormalities". Síntese dos dados: Quinze artigos, na maioria série de casos, foram incluídos. Em geral, a história médica revelou complicações clínicas durante a gestação e/ou primeiros anos de vida. As características clínicas incluíram defeitos de esmalte dentário na região cervical de incisivos e mobilidadeacentuada de molares e incisivos permanentes. Radiograficamente, observou-se a presença de câmaras pulpares parcialmente obliteradas, raízes de molares e incisivos permanentes curtas, finas e incompletas. Microscopicamente, reportou-se a ocorrência de camada de dentina hipercalcificada, em forma de lente, no interior da câmara pulpar, ao nível da junção cemento-esmalte, denominada de "diafragma cervical mineralizado". Conclusão: A "Malformação molar-incisivo" é uma anomalia caracterizada por alterações do desenvolvimento radicular, da câmara pulpar e do esmalte em molares e incisivos permanentes. O diagnóstico diferencial inclui Displasia dentinária tipo I e Odontodisplasia regional. Históricos médico e familiar são essenciais para o diagnóstico final, e o tratamento, o qual apesar de não ter protocolo estabelecido requer abordagem multidisciplinar e tratamentos convencionais como exodontia, endodontia, ortodontia e implantes dentários.


Subject(s)
Humans , Tooth Abnormalities , Tooth Root/abnormalities , Incisor/abnormalities , Molar/abnormalities , Dental Enamel
12.
Braz. dent. j ; 31(6): 582-588, Nov.-Dec. 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1132346

ABSTRACT

Abstract This study evaluated the dimensions of intraradicular posts using a new cone beam CT (CBCT) software, and verified the potential of blooming artifact reduction. Sixty-three single-rooted human teeth were shaped, obturated, prepared for intracanal post placement and distributed into three groups: G1: anatomically customized prefabricated glass fiber posts; G2: low-fusion alloy posts; G3: gold alloy posts. After post fabrication and luting with RelyX U200®, specimens were sectioned axially at 9 mm from the root apex, and markings were made on the root surfaces (X-, Y- and Z-axes). The dimensions of the original posts (control group) were measured using a digital micrometer. CBCT scans of the teeth were obtained using a PreXion 3D Elite® scanner. Posts were measured on CBCT scans using DICOM files and the e-Vol DX software. A specific filter, Blooming Artefact Reduction (BAR), was developed to analyze intracanal posts. Statistical data were evaluated using the Van de Waerden nonparametric analysis of variance and, after that, normalized data were analyzed using the Tukey test. The level of significance was set at α = 5%. The measures of the anatomical prefabricated, low-fusion alloy and gold alloy intracanal posts obtained using the e-Vol DX CBCT software and a micrometer were not significantly different (p>0.05). The use of the BAR filter of the e-Vol DX software application did not induce any dimensional differences on CBCT scans of intracanal posts when compared with measurements made with a micrometer on original posts. The use of the BAR filter eliminated blooming artifacts.


Resumo Este estudo avaliou as dimensões de pinos intrarradiculares usando um novo software de tomografia computadorizada de feixe cônico (TCFC) e um micrômetro digital, e verificou o potencial da redução do artefato de contraste do branco. Sessenta e três dentes humanos unirradiculares foram modelados, obturados, preparados para colocação de pinos e distribuídos em três grupos: G1: pino de fibra de vidro pré-fabricado anatômico; G2: pino metálico de liga de baixa fusão; G3: pino metálico de liga de ouro. Após a confecção e cimentação dos pinos com RelyX U200®, os espécimes foram cortados no sentido axial a 9 mm do ápice radicular, sendo efetuadas marcações em suas superfícies radiculares (eixos X, Y e Z) para orientação das medidas e sincronizações das imagens. Foi utilizado um micrômetro digital para a mensuração das dimensões dos pinos originais (grupo controle) associado ao microscópio operatório. Posteriormente, as imagens em TCFC foram obtidas usando o PreXion 3D Elite®. Para a mensuração dos pinos nas imagens de TCFC utilizou-se o arquivo DICOM e a ferramenta de medida do software e-Vol DX, configurada para medidas milesimais, com o filtro BAR (Blooming Artifact Reduction). Os dados estatísticos foram avaliados com a análise de variância não-paramétrica de Van der Waerden, seguida pelo Teste de Tukey aplicado aos dados normalizados. O nível de significância foi de α = 5%. Os resultados mostraram que as medidas dos diâmetros dos pinos intrarradiculares (fibra de vidro anatômico, metálico liga de baixa fusão, e em liga de ouro) usando o software e-Vol DX e o micrômetro não mostram diferenças significativas entre si. O uso do filtro BAR do software e-Vol DX não induziu diferenças dimensionais nas imagens de TCFC dos pinos quando comparadas às medidas realizadas com o micrômetro sobre os pinos originais. O uso do filtro BAR eliminou artefatos de contraste do branco.


Subject(s)
Humans , Post and Core Technique , Artifacts , Tooth Root , Software , Cone-Beam Computed Tomography
13.
J. oral res. (Impresa) ; 9(5): 405-413, oct. 31, 2020. ilus, graf, tab
Article in English | LILACS | ID: biblio-1179032

ABSTRACT

Introduction: This study evaluated the influence of sonic vibration and thermocycling on the bond strength of fiberglass posts using conventional dual-cured and self-adhesive resin cements. Material and Methods: Ninety-six single-rooted endodontically treated teeth were divided randomly into eight groups according to the cement used (dual-cured or self-adhesive resin cement), use of sonic vibration during post accommodation, and aging conditions (24h in distilled water or 5,000 thermal cycles). The fiberglass posts (White Post DC1, FGM) were cleaned with alcohol, treated with silane and cemented with dual-cured (Allcem Core, FGM) or with self-adhesive resin cement (seT, SDI). For groups in which sonic vibration was used, the posts were accommodated, and sonic vibration was applied for 10 s using a special tip placed on top of the post (Sonic Smart Device, FGM). Pull-out tests were performed after storage in distilled water for 24h at 37°C or after thermocycling (5000 cycles, at 5°C and 55°C). The results were evaluated using three-way ANOVA and Tukey's test (α=0.05). Results: Significant differences were not observed between the bond strengths of dual-cured (87.93±41.81 N) and self-adhesive cement (82.53±41.43 N). Bond strength for the sonic vibration groups (100.36±42.35 N) was significantly higher than for groups without sonic vibration (70.13±34.90 N). There were significant differences between specimens subjected to thermocycling (98.33±39.42 N) and those stored for 24h in distilled water (72.16±39.67 N). Conclusion: It can be concluded that both sonic vibration and thermocycling significantly improved bond strength of fiberglass posts with the two evaluated resin cements.


Introducción: Este estudio evaluó la influencia de la vibración sónica y el termociclado en la fuerza de unión de los postes de fibra de vidrio utilizando cementos de resina autoadhesivos y de curado dual convencionales Material y Métodos: Se dividieron aleatoriamente noventa y seis dientes tratados endodónticamente de raíz única en ocho grupos según el cemento utilizado (cemento de resina de curado dual o autoadhesivo), el uso de vibración sónica durante la acomodación posterior y las condiciones de envejecimiento (24 horas agua destilada o 5.000 ciclos térmicos). Los postes de fibra de vidrio (White Post DC1, FGM) se limpiaron con alcohol, se trataron con silano y se cementaron con cemento de curado dual (Allcem Core, FGM) o con cemento de resina autoadhesivo (seT, SDI). Para los grupos en los que se utilizó vibración sónica, se acomodaron los postes y se aplicó la vibración sónica durante 10 s utilizando una punta especial colocada en la parte superior del poste (Sonic Smart Device, FGM). Las pruebas de extracción se realizaron después del almacenamiento en agua destilada durante 24 horas a 37ºC o después del termociclado (5000 ciclos, a 5ºC y 55ºC). Los resultados se evaluaron mediante ANOVA de tres vías y la prueba de Tukey (α = 0.05). Resultados: No se observaron diferencias significativas entre las resistencias de adhesión del cemento de curado dual (87,93 ± 41,81 N) y el cemento autoadhesivo (82,53 ± 41,43 N). La fuerza de unión para los grupos de vibración sónica (100,36 ± 42,35 N) fue significativamente mayor que para los grupos sin vibración sónica (70,13 ± 34,90 N). Hubo diferencias significativas entre los especímenes sometidos a termociclado (98,33 ± 39,42 N) y los almacenados durante 24 h en agua destilada (72,16 ± 39,67 N). Conclusión: Se puede concluir que tanto la vibración sónica como el termociclado mejoraron significativamente la fuerza de unión de los postes de fibra de vidrio con los dos cementos de resina evaluados.


Subject(s)
Humans , Vibration , Post and Core Technique/instrumentation , Resin Cements/chemistry , Flexural Strength , Glass , Sonication/methods , Tooth Root , Dental Bonding , Dentin-Bonding Agents , Dentin/chemistry , Ultrasonic Waves
14.
Braz. dent. j ; 31(5): 516-522, Sept.-Oct. 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1132339

ABSTRACT

Abstract The purpose of this study was to evaluate the accuracy of Cone-Beam Computed Tomography (CBCT) in measuring radicular dentin thickness focused on intraradicular post placement planning treatment. Ten single-rooted human premolars were selected. The teeth were divided into three segments (cervical, middle and apical). The coronal face of the apical and middle sections was selected for the dentin thickness assessment; which was measured from the external root surface to the root canal wall, on the buccal, lingual, mesial, and distal surfaces of each tooth. In situ anatomical measurement was the reference standard, and the corresponding axial CBCT imaging were evaluated by the i-CAT software. The one-way ANOVA test and the Bonferroni post hoc test were applied to compare the groups (p>0.05). CBCT imaging measurements (p=0.003) overestimated the radicular dentin thickness compared to the reference standard. Descriptive analysis showed that the greatest difference between the reference standard and the tomographic measurement means were 0.20 mm. One-way ANOVA test found the statistical significant difference among group's measurements. Bonferroni correction demonstrated statistically significant difference only related lingual surface for the CBCT imaging measurements. CBCT imaging measurements overestimated the radicular dentin thickness. However, the measurement difference was clinically acceptable.


Resumo O objetivo deste estudo foi avaliar a precisão da Tomografia Computadorizada de Feixe Cônico (TCFC) na mensuração da espessura da dentina radicular no planejamento de tratamento envolvendo a cimentação de pinos intrarradiculares. Dez pré-molares humanos unirradiculares foram selecionados. Os dentes foram divididos em três segmentos (cervical, médio e apical). A face coronal dos terços apical e médio foi selecionada para a avaliação da espessura da dentina; que foi medida a partir da superfície externa da raiz até a parede do canal radicular, nas superfícies vestibular, lingual, mesial e distal de cada dente. A medida anatômica in situ foi o padrão de referência, e a imagem de TCFC axial correspondente foi avaliada pelo software i-CAT. O teste de 1-fator ANOVA e o teste post hoc de Bonferroni foram aplicados para comparar os grupos (p>0,05). As medidas de imagem da TCFC (p=0,003) superestimaram a espessura da dentina radicular em comparação a referência padrão. A análise descritiva mostrou que a maior diferença entre a referência padrão e a medida tomográfica foi de 0,20 mm. O teste ANOVA encontrou a diferença de significância estatística entre as medidas do grupo. A correção de Bonferroni demonstrou diferença estatisticamente significante apenas relacionada às medidas de imagem da TCFC. A medida de imagem da TCFC superestimou a espessura da dentina radicular. No entanto, a diferença de medição foi clinicamente aceitável.


Subject(s)
Humans , Tooth Root/diagnostic imaging , Cone-Beam Computed Tomography , Root Canal Therapy , Bicuspid/diagnostic imaging , Dental Pulp Cavity , Dentin/diagnostic imaging
15.
Braz. dent. j ; 31(5): 505-510, Sept.-Oct. 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1132327

ABSTRACT

Abstract The present study used microcomputed tomography (micro-CT) images to assess the prevalence, number, and location of apical ramifications (ARs) in the root canals of different dental groups in a Brazilian population. Three hundred and sixty-seven extracted human teeth, totaling 475 roots, were scanned by micro-CT at 19.6 µm spatial resolution. The obtained images were evaluated by two observers in consensus, and a descriptive analysis was performed to verify the prevalence, number, and location of ARs in each dental group. Chi-square test was used to compare the prevalence of ARs in different types of roots, and one-way analysis of variance compared the number of ARs in the apical 1 mm, 2 mm, and 3 mm of the root. Significance level was established at 5% (α=0.05). ARs were present in 253 (53.3%) of the 475 roots evaluated. A total of 607 ARs were detected, with the vast majority (530) located at one and two millimeters from the main foramen. The highest prevalence of ARs was observed in maxillary canines (65%); maxillary premolars - single-rooted (83.3%), buccal root (80%), and palatine root (73.3%); mandibular premolars (64.2%); mesiobuccal root of maxillary molars (76.6%); and mesial root of mandibular molars (66.6%). For the Brazilian population, most of the ARs are located in the apical 1 and 2 mm of the root, with greater prevalence in the posterior teeth and maxillary canines. These findings suggest the need for additional attention while planning endodontic treatments, including strategies to effectively clean and fill the apical region.


Resumo O presente estudo utilizou imagens de microtomografia computadorizada (MicroCT) para avaliar a prevalência, número e localização de ramificações apicais (RAs) dos canais radiculares de diferentes grupos dentários em uma população brasileira. Trezentos e sessenta e sete dentes humanos extraídos (totalizando 475 raízes) foram escaneados em um aparelho de MicroCT, com uma resolução espacial de 19,6 µm. As imagens foram analisadas em consenso por dois avaliadores, e uma análise descritiva foi realizada para verificar a prevalência, número e localização de RAs em cada grupo dentário. O teste Qui-quadrado foi utilizado para comparar a prevalência de RAs em diferentes tipos de raízes e a análise de variância (ANOVA - um critério) comparou o número de RAs em 1 mm, 2 mm e 3 mm apicais da raiz. O nível de significância foi estabelecido em 5% (α=0,05). As RAs estavam presentes em 253 (53,3%) das 475 raízes avaliadas. Foram detectadas 607 RAs com a maioria (530) localizada a 1 e 2 milímetros do forame principal. A mais alta prevalência de RAs foi observada nos caninos superiores (65%); pré-molares superiores - unirradiculares (83,3%), raiz vestibular (80%) e raiz palatina (73,3%); pré-molares inferiores (64,2%); raiz mésio-vestibular dos molares superiores (76,6%); e raiz mesial dos molares inferiores (66,6%). Na população brasileira, a maioria dos RAs está localizada em 1 e 2 mm apicais da raiz, com maior prevalência nos dentes posteriores e nos caninos superiores. Esses achados sugerem atenção adicional ao planejar um tratamento endodôntico, bem como adoção de estratégias para uma limpeza e obturação efetiva da região apical dos dentes.


Subject(s)
Humans , Tooth Root , Dental Pulp Cavity/diagnostic imaging , Brazil , X-Ray Microtomography , Molar
16.
Rev. Asoc. Odontol. Argent ; 108(2): 57-62, mayo-ago. 2020. ilus
Article in Spanish | LILACS | ID: biblio-1121186

ABSTRACT

Objetivo: Describir la importancia del reconocimiento oportuno del trauma crónico de la mucosa bucal producido por un elemento dentario que generó una lesión erróneamente diagnosticada como neoplasia maligna. Caso clínico: Una paciente de sexo femenino, de 79 años de edad, realizó una consulta estomatológica por una lesión lingual con un diagnóstico presuntivo de cáncer. Tras la inspección de la cavidad bucal y el estudio anatomopatológico se diagnosticó úlcera asociada a trauma dentario. La intervención terapéutica odontológica (eliminación del trauma) resolvió el cuadro cínico. Conclusión: El trauma crónico en la mucosa bucal puede generar lesiones sobre mucosa sana o bien complicar una patología preexistente. En el presente caso, la inspección de la cavidad bucal con la identificación y la eliminación del trauma lograron la reparación de la lesión. El estudio anatomopatológico precisó el diagnóstico de ulceración asociada a trauma dentario (AU)


Aim: The aim of this case report is to show the importance of the early diagnosis of a traumatic lesion of the oral mucosa arising from a posterior broken tooth that was initially misdiagnosed as oral cancer. Case report: A 79-year-old female attends an appointment with the oral medicine specialist for a lesion on the lateral side of the tongue with a presumptive diagnosis of oral cancer. The examination of the oral cavity and the anatomopathological diagnosis confirmed the presence of an ulcer associated with dental trauma. The lesion healed completely with the elimination of the trauma. Conclusion: Chronic trauma in the oral cavity can produce lesions in the oral mucosa or exacerbate preexisting lesions. In this case report a thorough oral examination showed a broken tooth as the cause of trauma and after its removal the lesion healed completely. The result of the biopsy confirmed the diagnosis of an oral ulcer associated with dental trauma (AU)


Subject(s)
Humans , Female , Aged , Tongue Diseases/diagnosis , Oral Ulcer/diagnosis , Diagnosis, Differential , Diagnostic Errors , Tooth Extraction , Tooth Root/pathology , Biopsy
17.
Rev. Asoc. Odontol. Argent ; 108(2): 63-67, mayo-ago. 2020. ilus
Article in Spanish | LILACS | ID: biblio-1121413

ABSTRACT

Objetivo: Presentar un caso clínico de dos premolares inferiores con perforación radicular iatrogénica obturadas con Biodentine. Caso clínico: Una paciente de 54 años de edad fue derivada para realizar el tratamiento endodóntico en las piezas dentarias 44 y 45. Los exámenes clínico y radiográfico revelaron la presencia de perforaciones radiculares, cuya localización fue confirmada por medio de una tomografía computarizada de haz cónico. Luego de la desinfección y la instrumentación de los conductos radiculares, ambas perforaciones fueron selladas con Biodentine. Finalmente, los conductos fueron obturados, y las cavidades de acceso, restauradas con resina compuesta. Una semana después los dientes se encontraban asintomáticos y sin tumefacción. La paciente fue controlada nuevamente a los 20 meses postratamiento. Al examen clínico, ambos dientes estaban asintomáticos y funcionales. No hubo signos de infección, inflamación o sensibilidad a la percusión y la palpación. Las imágenes radiográficas y tomográficas revelaron espacio periodontal y cortical ósea normales. Conclusión: En el presente caso clínico, el Biodentine resultó un material adecuado para la obturación de perforaciones radiculares de origen iatrogénico ubicadas en la unión de los tercios medio y coronal (AU)


Aim: To present a clinical case of two lower premolars with iatrogenic root perforations in which both defects were repaired with Biodentine. Clinical case: A healthy 54-year old female was referred for endodontic treatment of teeth number 44 and 45. Clinical and radiographic examination revealed the presence of root perforations whose buccal localization was confirmed by a cone beam computed tomography scan. After the root canals were instrumented, both perforations were filled with Biodentine. The canals were obturated and the endodontic accesses were restored. A week later, the teeth were asymptomatic and without the presence of swelling. The patient was recalled 20-months after treatment and both teeth were asymptomatic and functional with no signs of infection, inflammation or sensitivity to percussion and palpation. Radiograph and cone beam computed tomography images showed a normal periodontal width and an intact lamina dura. Conclusion: Based on the outocome of this clinical case, Biodentine was an adequate material to repair iatrogenic root perforations (AU)


Subject(s)
Humans , Female , Middle Aged , Root Canal Filling Materials/therapeutic use , Silicate Cement/therapeutic use , Tooth Root/injuries , Iatrogenic Disease , Root Canal Therapy , Signs and Symptoms , Bicuspid/diagnostic imaging , Treatment Outcome , Cone-Beam Computed Tomography
18.
Dental press j. orthod. (Impr.) ; 25(2): 18-23, Mar.-Apr. 2020. graf
Article in English | LILACS, BBO | ID: biblio-1133652

ABSTRACT

ABSTRACT If essential care is thorough, teeth with extensive orthodontically induced dental resorption can have the same endurance as normal teeth. These teeth are subjected to the same disturbances as normal ones, such as dental trauma, dental caries and periodontal disease, all of which are independent of severe dental resorption. Orthodontic retreatments of teeth presenting with extensive orthodontically induced dental resorption must take into consideration that these roots are shorter in length, therefore, they are more prone to root resorption. Conventional movements are not viable in severe resorption, but Orthodontics offer some alternatives, such as; 1) movement of multiple teeth, providing better distribution of force; 2) use of lesser forces along with bodily movements, as opposed to rotation; 3) anchorage using miniplates, which provide more diffuse and equally distributed force and movements upon teeth and bone. Extensive orthodontically induced dental resorption are not an indication for endodontic treatment. These teeth also should not be replaced by osseointegrated dental implants, but they must receive special care, as they must remain in the dental arch indefinitely.


RESUMO Se os cuidados essenciais forem seguidos detalhadamente, os dentes com reabsorções radiculares extensas induzidas ortodonticamente permanecem na boca o mesmo tempo que os dentes normais. Esses dentes podem ter as mesmas alterações que os normais, como traumatismos dentários, cárie dentária e doença periodontal, que independem das reabsorções severas. Os retratamentos ortodônticos envolvendo dentes com reabsorções radiculares extensas induzidas ortodonticamente devem considerar que as raízes são curtas e representam um forte fator preditivo para as reabsorções radiculares. A movimentação convencional fica inviabilizada nas reabsorções radiculares severas, mas a Ortodontia oferece alternativas, como: 1) movimentação de dentes em grupos, distribuindo melhor as forças; 2) uso de forças bem leves e com movimento de corpo, e não de inclinação; e 3) planejamentos com ancoragem tipo miniplacas, cujas forças e movimentos sobre os dentes e ossos são mais difusos e igualmente distribuídos. As reabsorções radiculares extensas induzidas ortodonticamente não são indicações para se fazer tratamentos endodônticos. Esses dentes também não devem ser substituídos por implantes dentários osseointegráveis. Eles devem receber cuidados especiais, para que possam permanecer em função na arcada dentária, indefinidamente.


Subject(s)
Humans , Orthodontics , Root Resorption , Dental Caries , Tooth Movement Techniques , Tooth Root , Bicuspid
19.
Chinese Journal of Stomatology ; (12): 461-465, 2020.
Article in Chinese | WPRIM | ID: wpr-827012

ABSTRACT

Fiber-reinforced resin composite posts (fiber posts) are used extensively for the restoration of root-treated teeth with excessive loss of coronal structure. However, the longevity of a fiber post restoration still needs to be improved because of the various confounding factors that affect bonding procedures. Operational specification for clinical use of dental intraradicular fiber post was established based on the in-depth discussions by a panel of experts from Society of Prosthodontics, Chinese Stomatological Association. This specification should be helpful in standardizing the clinical technique of fiber post placement and improving the clinical longevity of a fiber post restoration.


Subject(s)
Cementation , Composite Resins , Dental Bonding , Dental Stress Analysis , Glass , Materials Testing , Post and Core Technique , Resin Cements , Tooth Root
20.
Int. j. odontostomatol. (Print) ; 14(3): 457-463, 2020. tab, graf
Article in English | LILACS | ID: biblio-1114921

ABSTRACT

To evaluate clinically the results of two surgical techniques used for root coverage, the coronally advanced flap in '' L '' isolated (CAF) or associated with subepithelial connective tissue graft (SCTG). The surgical procedures were performed in seventeen individuals, ten individuals in the control group (coronally advanced flap in "L") and seven individuals in the test group (coronally advanced flap in "L" associated with SCTG), who presented Miller class I and II gingival recession. The depth gingival recession (GR) index was evaluated in the following periods: immediate preoperative and 180 postoperative days. The control group had a success rate of 85 +/- 18 % and the test group had a success rate of 95 +/- 4 %. The variable success rates (p=0.36) did not present a statistically significant difference. The isolated CAF or its association with SCTG showed favorable outcomes in the treatments of Miller's class I and II gingival recessions.


El objetivo fue evaluar clínicamente los resultados de dos técnicas quirúrgicas utilizadas para la cobertura radicular, el colgajo coronalmente avanzado en "L" aislado (CAF) o asociado con injerto de tejido conectivo subepitelial (SCTG). Los procedimientos quirúrgicos se realizaron en diecisiete individuos, diez individuos en el grupo de control (colgajo coronario avanzado en "L") y siete individuos en el grupo de prueba (colgajo coronalmente avanzado en "L" asociado con SCTG), que presentaron la clase I de Miller y II recesión gingival. El índice de recesión gingival profunda (RG) se evaluó en los siguientes períodos: preoperatorio inmediato y 180 días postoperatorios. El grupo de control tuvo una tasa de éxito de 85 +/- 18 % y el grupo de prueba tuvo una tasa de éxito de 95 +/- 4 %. Las tasas de éxito variables (p = 0,36) no presentaron una diferencia estadísticamente significativa. La CAF aislada o su asociación con SCTG mostraron resultados favorables en los tratamientos de las recesiones gingivales de clase I y II de Miller.


Subject(s)
Humans , Surgical Flaps , Connective Tissue/transplantation , Gingival Recession/surgery , Tooth Root , Case-Control Studies , Treatment Outcome
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