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1.
Crit Rev Oncol Hematol ; 138: 14-23, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31092370

RESUMO

Dosimetry for low-level laser therapy (LLLT) depends on several parameters, such as target tissue type, lesion type and laser equipment used. This study aimed to determine the most used LLLT dosimetry for the treatment and prevention of oral mucositis (OM) resulting from radiation therapy (RT) in head and neck cancer patients (HNCP). This research was conducted according to the PRISMA guidelines using the PICO framework. After extensively searching PubMed, Web of Science, Embase, Scopus, BVS and Cochrane Library databases, we found 130 records and selected 7 studies, involving 363 HNCP with an average age of 60.6 years who received RT. Briefly, sites affected by tumors were the following: oral cavity (170), oropharynx (91), throat (42), larynx (32), nasopharynx (11), hypopharynx (9), and in 8 cases, sites were not reported. These studies used several classifications for OM (RTOG/EORTC, WHO, NCI-CTC) and pain (NRS, VAS and modified VAS). These various researchers performed the LLLT punctual application of different forms using several protocols making analysis difficult. However, LLLT was effective regardless of the parameters used (632.8 nm to 685 nm, 1.8 J/cm2 to 3.0 J/cm2, 10 mW to 60 Mw, 0.8 J to 3.0 J). The meta-analysis showed a better results with preventive LLLT 660 nm, 3.8 J/cm2, 15 mW; 0.15 J compared to preventive LLLT 660 nm, 1.3 J/cm2, 5 mW; 0.05 J (OMS: p = 0.03; NCI-CTC: p = 0.027). We conclude that there is, as of yet, no evidence of better laser dosimetry being more effective. Thus, randomized clinical trials to determine which doses of LLLT are most appropriate for treating and preventing OM due to RT are lacking and should be further investigated.


Assuntos
Neoplasias de Cabeça e Pescoço/radioterapia , Terapia com Luz de Baixa Intensidade/métodos , Lesões por Radiação/radioterapia , Radiometria/métodos , Estomatite/radioterapia , Adulto , Idoso , Humanos , Pessoa de Meia-Idade , Estomatite/etiologia
2.
J Craniofac Surg ; 30(2): e138-e141, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30570591

RESUMO

The foramen of Huschke (FH) is present in the early stages of the temporal bone tympanic portion development. The literature shows that FH may persist in adult individuals and several authors acknowledge its clinical importance, reporting being associated with the dissemination of diseases. Some authors believe that FH presents importance in archeology and forensic situations.Considering that the identification of FH by conventional imaging methods is extremely impaired or impossible due to overlapping bone structures and that cone-bean computed tomography presents quality in the evaluation of this structure, the authors conducted this research to determine the FH prevalence and dimensions through the Invivo5 software, and correlated its size with age.The foramen was present in 19 scans (12.7%), 6 (8.8%) were present among male and 13 (15.8%) among female. The χ test was performed, with no statistically significant difference for gender and age. Considering the age, in individuals aged 7 to 18 years, 16.4% of persistent FH was found compared with 10.5% in individuals over 18 years of age. The diameter ranged from 2.58 to 3.28 mm. No correlation was found between size and age (p between 0.25 and 0.88).The authors conclude that the cone-bean computed tomography is an examination that allows the correct evaluation of the FH and, although the persistence of this unusual anatomical variation presents different frequencies in the different populations and age groups, it can have clinical consequences, so that the professionals who work in the area must be aware of its existence.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Osso Temporal/anatomia & histologia , Osso Temporal/diagnóstico por imagem , Adolescente , Adulto , Distribuição por Idade , Idoso , Variação Anatômica , Criança , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
3.
J Endod ; 44(12): 1862-1866, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30390974

RESUMO

INTRODUCTION: The purpose of this study was to evaluate the accuracy of small-volume cone-beam computed tomography (CBCT) to detect and measure isthmi in the apical root canals of mandibular molars by using micro-computed tomography (µ-CT) as the reference standard. METHODS: Forty mandibular first molars selected on the basis of µ-CT scan and presenting isthmi in the apical 3-mm mesial roots were scanned by using the highest-resolution settings of a small-volume CBCT unit. Isthmi lengths were measured and compared between both µ-CT and CBCT images to study the accuracy of CBCT readings. Quantitative data for sensitivity rate were depicted as percentage value with 95% confidence interval. Results were analyzed by using linear regression between true lengths (µ-CT) and CBCT lengths, Bland-Altman plot and t test, at α = 0.05. RESULTS: CBCT sensitivity for isthmi detection was 65% (95% confidence interval, 0.4667-0.8333). An average of 74.7% of the lengths could be measured, and differences among the lengths in µ-CT and CBCT were significant (P < .05; mean, 0.756 ± 0.655; t test), showing that there was no agreement between both methods. CONCLUSIONS: Accuracy of identifying apical isthmi of mandibular molars was highly influenced by the evaluation method. Small-volume CBCT imaging could not detect and measure apical isthmi length accurately. Moreover, using high-resolution settings in CBCT, it was not reliable to forecast the actual apical root canal anatomy.

4.
J Oral Maxillofac Surg ; 76(9): 1893-1901, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29626448

RESUMO

PURPOSE: The aim was to assess the effect of a relevant regimen of zoledronic acid (ZA) treatment for the study of bisphosphonate-related osteonecrosis of the jaw on alveolar bone microstructure and vasculature. A sub-objective was to use 3-dimensional imaging to describe site-specific changes induced by ZA in the alveolar bone. MATERIALS AND METHODS: Five Wistar rats received ZA (0.6 mg/kg) and five (controls) received saline solution in the same volume. The compounds were administered intraperitoneally in 5 doses every 28 days. The rats were euthanized 150 days after therapy onset. The mandibles were scanned using high-resolution (14-µm) micro-computed tomography (micro-CT), decalcified, cut into slices for histologic analysis (5 µm), and stained with hematoxylin-eosin. Bone quality parameters were calculated using CT-Analyser software (Bruker, Kontich, Belgium) in 2 different volumes of interest (VOIs): the region between the first molar roots (VOI-1) and the periapical region under the first and second molars' apex (VOI-2). Blood vessel density and bone histomorphometric parameters were calculated only for the region between the roots of the first molar using AxioVision Imaging software (version 4.8; Carl Zeiss, Gottingen, Germany). RESULTS: ZA-treated rats showed a significant increase in percentage of bone volume and density (P < .05), with thicker and more connected trabeculae. Furthermore, the ZA group showed a significant decrease in the size of the marrow spaces and nutritive canals and in blood vessel density (P < .05). In the micro-CT evaluation, VOI-2 showed better outcomes in measuring the effect of ZA on alveolar bone. CONCLUSIONS: ZA treatment induced bone corticalization and decreased alveolar bone vascularization. VOI-2 should be preferred for micro-CT evaluation of the effect of bisphosphonates on alveolar bone. This analysis allowed the effect of ZA on alveolar bone and its vascularization to be characterized. The results of this analysis may add further knowledge to the understanding of the physiopathology of osteonecrosis of the jaw.

5.
Braz Dent J ; 27(6): 757-760, 2016 Oct-Dec.
Artigo em Inglês | MEDLINE | ID: mdl-27982191

RESUMO

This study aimed to evaluate the accuracy of panoramic radiographs obtained by digital system based on charge coupled device (CCD) and a phosphor storage plate (PSP) system with two different file formats, JPEG irreversible type and BMP. Linear measurements of artificial bony defects were made in dry mandibles with a digital caliper. Measures of digital panoramic radiographs were taken in ImageJ(r) software. Each measurement was performed twice by an experienced examiner. The intra-rater agreement was considered very strong (Pearson's correlation coefficient of 0.97). There was no significant difference between the linear measurements of dry mandibles, considered the gold standard, in relation to measurements obtained from digital radiographs (p=0.47). The error of these measures for the CCD was 1.04 mm (9.97%) for JPEG images and 1.03 mm (9.99%) for those with BMP format. For the PSP images, these values were 1.48 mm (14.94%) and 1.43 mm (14.43%), respectively. Although there was no statistical difference between the images with JPEG and BMP format, for both digital systems (p=1.00 for CCD and p=0.98 for PSP system), errors made on radiographs obtained by PSP system were significantly higher than those of CCD (p<0.05). The size of the files saved in JPEG was also significantly lower (p=0.005) compared with the files saved in BMP. It may be concluded that the digital radiographs, both saved in JPEG and BMP formats, are accurate, regardless the used digital system, and JPEG images are more suitable for teleradiology.


Assuntos
Compressão de Dados , Radiografia Dentária Digital/métodos , Radiografia Panorâmica/métodos
6.
Braz. dent. j ; 27(6): 757-760, Nov.-Dec. 2016. tab
Artigo em Inglês | LILACS | ID: biblio-828073

RESUMO

Abstract This study aimed to evaluate the accuracy of panoramic radiographs obtained by digital system based on charge coupled device (CCD) and a phosphor storage plate (PSP) system with two different file formats, JPEG irreversible type and BMP. Linear measurements of artificial bony defects were made in dry mandibles with a digital caliper. Measures of digital panoramic radiographs were taken in ImageJ(r) software. Each measurement was performed twice by an experienced examiner. The intra-rater agreement was considered very strong (Pearson's correlation coefficient of 0.97). There was no significant difference between the linear measurements of dry mandibles, considered the gold standard, in relation to measurements obtained from digital radiographs (p=0.47). The error of these measures for the CCD was 1.04 mm (9.97%) for JPEG images and 1.03 mm (9.99%) for those with BMP format. For the PSP images, these values were 1.48 mm (14.94%) and 1.43 mm (14.43%), respectively. Although there was no statistical difference between the images with JPEG and BMP format, for both digital systems (p=1.00 for CCD and p=0.98 for PSP system), errors made on radiographs obtained by PSP system were significantly higher than those of CCD (p<0.05). The size of the files saved in JPEG was also significantly lower (p=0.005) compared with the files saved in BMP. It may be concluded that the digital radiographs, both saved in JPEG and BMP formats, are accurate, regardless the used digital system, and JPEG images are more suitable for teleradiology.


Resumo Este estudo teve como objetivo avaliar a acurácia de radiografias panorâmicas digitais obtidas por sistema digital baseado em dispositivo acoplador de carga (DAC) e por sistema de placa de fósforo (PF) com duas diferentes extensões de arquivo (JPEG e BMP, sendo o primeiro do tipo compactador irreversível). Medidas lineares de defeitos ósseos foram realizadas em mandíbulas secas com paquímetro digital. As medidas correspondentes nas radiografias panorâmicas digitais foram realizadas no software ImageJ(r). As medidas foram realizadas duas vezes por um examinador. A concordância intraexaminador foi considerada muito forte (coeficiente de correlação de Pearson de 0,97). Não houve diferença significante entre as medidas lineares das mandíbulas secas, consideradas padrão-ouro, em relação às medidas obtidas das radiografias digitais (p=0,47). Os erros absolutos e relativos dessas medidas para o DAC foram de 1,04 mm (9,97%) para as imagens JPEG e de 1,03 mm (9,99%) para aquelas com extensão BMP. Para o sistema digital com PF esses valores foram de 1,48 mm (14,94%) e 1,43 mm (14,43%), respectivamente. Apesar de não ter havido diferença estatística entre as imagens com extensão JPEG e BMP, para ambos os sistemas digitais (p=1,00 para DAC e p=0,98 para a PF), os erros das medidas realizadas nas radiografias obtidas pelo sistema de PF foram significativamente maiores que os erros do DAC (p<0,05). O tamanho dos arquivos salvos em JPEG também foram significativamente menores (p=0,005) em comparação com os arquivos salvos em BMP. Pode-se concluir que as radiografias digitais tanto com extensão JPEG quanto BMP são acuradas, independente do sistema digital utilizado e as imagens salvas em JPEG são mais indicadas em telerradiologia.


Assuntos
Compressão de Dados , Radiografia Dentária Digital/métodos , Radiografia Panorâmica/métodos
7.
Clin Oral Investig ; 20(1): 179-85, 2016 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25963719

RESUMO

OBJECTIVE: The aim of this in vitro study was to evaluate the reliability and accuracy of linear measurements on three-dimensional (3D) surface models obtained by standard pre-set thresholds in two segmentation software programs. MATERIALS AND METHODS: Ten mandibles with 17 silica markers were scanned for 0.3-mm voxels in the i-CAT Classic (Imaging Sciences International, Hatfield, PA, USA). Twenty linear measurements were carried out by two observers two times on the 3D surface models: the Dolphin Imaging 11.5 (Dolphin Imaging & Management Solutions, Chatsworth, CA, USA), using two filters(Translucent and Solid-1), and in the InVesalius 3.0.0 (Centre for Information Technology Renato Archer, Campinas, SP, Brazil). The physical measurements were made by another observer two times using a digital caliper on the dry mandibles. RESULTS: Excellent intra- and inter-observer reliability for the markers, physical measurements, and 3D surface models were found (intra-class correlation coefficient (ICC) and Pearson's r ≥ 0.91). The linear measurements on 3D surface models by Dolphin and InVesalius software programs were accurate (Dolphin Solid-1 > InVesalius > Dolphin Translucent). The highest absolute and percentage errors were obtained for the variable R1-R1 (1.37 mm) and MF-AC (2.53 %) in the Dolphin Translucent and InVesalius software, respectively. CONCLUSION: Linear measurements on 3D surface models obtained by standard pre-set thresholds in the Dolphin and InVesalius software programs are reliable and accurate compared with physical measurements. CLINICAL RELEVANCE: Studies that evaluate the reliability and accuracy of the 3D models are necessary to ensure error predictability and to establish diagnosis, treatment plan, and prognosis in a more realistic way.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Imagem Tridimensional , Mandíbula/diagnóstico por imagem , Humanos , Técnicas In Vitro , Interpretação de Imagem Radiográfica Assistida por Computador , Reprodutibilidade dos Testes , Software
8.
J Craniofac Surg ; 27(1): 219-21, 2016 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-26674888

RESUMO

The Pierre Robin sequence (PRS) and the Treacher Collins syndrome (TCS) are conditions that cause significant abnormalities of jaw. This study was conducted in anticipation of evaluating the morphology of interforaminal region and identify the anatomic variations: anterior loop and mandibular incisive canal, in individuals with PRS and TCS by cone-beam computed tomography and compare them with individuals without craniofacial anomalies. By applying the t-test, the results showed no statistically significant difference, allowing to infer that there are no significant differences in interforaminal mandible morphology between groups and indicated that the prevalence and location of the studied anatomic variations are consistent with those described in literature.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Mandíbula/diagnóstico por imagem , Disostose Mandibulofacial/diagnóstico por imagem , Síndrome de Pierre Robin/diagnóstico por imagem , Adolescente , Processo Alveolar/diagnóstico por imagem , Variação Anatômica , Feminino , Humanos , Masculino , Mandíbula/anormalidades , Radiografia Panorâmica/métodos , Estudos Retrospectivos
9.
J Med Eng Technol ; 39(8): 480-4, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-26200519

RESUMO

The aim of this study was to evaluate the accuracy of three-dimensional (3D) reconstructions generated by different software, computed tomography (CT) scanners and slice thicknesses. Ten human dry mandibles were scanned by CT and cone beam CT (CBCT). Digital files were processed in different software systems and 3D reconstructions were performed. Linear measures were made and compared. The results showed significant differences in linear distances between the human dry mandibles and their 3D reconstructions. The relative error from CBCT images ranged from 3.10 to 4.82% and from 3.40 to 5.92% in CT images. It is important to consider that the performance of the software is not just related to the algorithm used, but mostly with its handling, that can facilitate or not the measurement by the operator. In conclusion, the discrepancies were not greater than 0.58 mm, so they should not affect the image quality.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Tomografia Computadorizada de Feixe Cônico/normas , Imagem Tridimensional/métodos , Imagem Tridimensional/normas , Software , Humanos , Mandíbula/diagnóstico por imagem , Reprodutibilidade dos Testes
10.
Braz Oral Res ; 292015.
Artigo em Inglês | MEDLINE | ID: mdl-26017488

RESUMO

The aim of this study was to evaluate the reproducibility of the gray values and noise of a direct digital radiography system (Visualix eHD) for various exposure times and analyzed regions. To obtain radiographic images in a standardized manner, the digital sensor of the system and a stepwedge were positioned in a phantom at a focus-film distance of 30 cm in a dental device at 70 kV, 7 mA and 2.2 mm filtration. Ten consecutive repetitions of X-ray imaging were performed at each exposure time (0.05, 0.07, 0.09 and 0.13 s). Gray values were analyzed using ImageJ software in five regions of interest (ROIs): alveolar bone (AB), soft tissue (ST) and three steps of the stepwedge (S1, S2 and S3). The results showed that both the variability of the gray values and the noise were statistically greater (p < 0.05) in the most radiolucent region (ST). Only the noise was affected by the exposure time. In conclusion, the reproducibility of the gray values and the noise of the Visualix eHD system can vary in specific areas with different radiolucency.


Assuntos
Processamento de Imagem Assistida por Computador/métodos , Radiografia Dentária Digital/instrumentação , Radiografia Dentária Digital/métodos , Processo Alveolar/diagnóstico por imagem , Análise de Variância , Desenho de Equipamento , Humanos , Imagens de Fantasmas , Doses de Radiação , Valores de Referência , Reprodutibilidade dos Testes , Fatores de Tempo
11.
Int J Legal Med ; 129(1): 195-201, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25270589

RESUMO

Age and sex estimation is crucial in forensic investigations, whether in legal situations that involve living people or to identify mortal remains. The aim of this study was to establish reference values in a Brazilian population to estimate age and sex by measuring the length of the mandibular ramus on lateral cephalometric radiographs, and to determine the probability that an individual being is 18 years or older, based on the results that were obtained. Two hundred and eighteen scanned lateral cephalograms of individuals between 6 and 20 years of age (101 males and 117 females) were measured with reference to mandibular ramus length (the distance between Condylion superior (Cs) and Gonion (Go)) using ImageJ 1.41 software (NIH, Bethesda, MA, USA). The results showed that sexual dimorphism was not observed until 16 years and, based on the ramus length measurements in this sample, it is possible to predict sex with an accuracy of only 54 %. There was a positive correlation between age and ramus length (r = 0.90; p < 0.001). From the linear regression analysis, one formula was derived; therefore, it was possible to calculate the individual's age, given his or her ramus length. The results showed that if an individual's ramus length is 7.0 cm or more, then there is an 81.25 % chance that the individual is 18 years old or older. In conclusion, the mandibular ramus length was not effective in discriminating sex. Mandibular length is strongly related to chronological age and can be used to predict whether an individual is 18 years or older with high degree of expected accuracy.


Assuntos
Determinação da Idade pelo Esqueleto/métodos , Mandíbula/anatomia & histologia , Determinação do Sexo pelo Esqueleto/métodos , Adolescente , Brasil , Cefalometria , Criança , Feminino , Antropologia Forense , Odontologia Legal , Humanos , Processamento de Imagem Assistida por Computador , Modelos Lineares , Masculino , Mandíbula/diagnóstico por imagem , Adulto Jovem
12.
Braz. oral res. (Online) ; 29(1): 1-5, 2015. tab, ilus
Artigo em Inglês | LILACS | ID: lil-777262

RESUMO

The aim of this study was to evaluate the reproducibility of the gray values and noise of a direct digital radiography system (Visualix eHD) for various exposure times and analyzed regions. To obtain radiographic images in a standardized manner, the digital sensor of the system and a stepwedge were positioned in a phantom at a focus-film distance of 30 cm in a dental device at 70 kV, 7 mA and 2.2 mm filtration. Ten consecutive repetitions of X-ray imaging were performed at each exposure time (0.05, 0.07, 0.09 and 0.13 s). Gray values were analyzed using ImageJ software in five regions of interest (ROIs): alveolar bone (AB), soft tissue (ST) and three steps of the stepwedge (S1, S2 and S3). The results showed that both the variability of the gray values and the noise were statistically greater (p < 0.05) in the most radiolucent region (ST). Only the noise was affected by the exposure time. In conclusion, the reproducibility of the gray values and the noise of the Visualix eHD system can vary in specific areas with different radiolucency.


Assuntos
Humanos , Processamento de Imagem Assistida por Computador/métodos , Radiografia Dentária Digital/instrumentação , Radiografia Dentária Digital/métodos , Análise de Variância , Processo Alveolar , Desenho de Equipamento , Imagens de Fantasmas , Doses de Radiação , Valores de Referência , Reprodutibilidade dos Testes , Fatores de Tempo
13.
Rev. Assoc. Paul. Cir. Dent ; 69(4): 336-339, 2015.
Artigo em Português | LILACS | ID: lil-778734

RESUMO

Realizar uma análise crítica sobre a utilização da Tomografia Computadorizadapor Feixe Cônico (TCFC) na Faculdade de Odontologia de Bauru - USP e as respectivas indicaçõesdeste exame por imagem. Materiais e Métodos: O estudo foi realizado por um únicoexaminador, que avaliou e registrou todos os dados referentes às imagens de TCFC realizadasno período compreendido entre os anos de 2008 a 2011. Resultados: Um total de 1061 examesde imagem de TCFC foram solicitados em um período de quatro anos. Destes, foram considerados722 exames correspondentes ao critério de inclusão. Os motivos pelas quais os examesforam solicitados: avaliação ortodôntica, avaliação endodôntica, reabsorção dentária, cirurgiaparaendodôntica, localização de sialólito, avaliação óssea, dente supranumerário, avaliação daarticulação temporomandibular,, fratura radicular, dente irrompido, avaliação de terceiro molar,retratamento endodôntico, avaliação do seio maxilar, diagnóstico de lesão maxilar, avaliaçãoperiodontal, diagnóstico de lesão mandibular, controle pós-operatório e avaliação para implante.Conclusão: As solicitações de TCFC na Faculdade de Odontologia de Bauru - USP no períododeterminado no estudo em questão foram coerentes com as indicações apresentadas pela literaturacientífica, o preenchimento completo da requisição para a realização do atendimentoainda não é uma prática frequente e mecanismos para o esclarecimento dos usuários do serviço...


Objective: To conduct a critical analysis on the use of Cone-Beam Computed Tomography(CBCT) scanner at Bauru School of Dentistry (USP/Brazil) and the indications of this imagingtechnique. Materials and Methods: The study was conducted by a single examiner, who evaluatedand recorded all data pertaining to the images of CBCT between the year of 2008 and2011. Results: A total of 1061 imaging of CBCT were requested in the four years of the study.Among them, 722 were considered relevant to the inclusion criteria exams. The reasons whythe tests were requested were: orthodontic evaluation, endodontic evaluation, tooth resorption,paraendodontic surgery, salivary calculi location, bone evaluation, supernumerary teeth,temporomandibular joint assessment, root fracture, erupted teeth, third molar evaluation, endodonticretreatment , evaluation of the maxillary sinus, diagnosis of jaw injury, periodontalevaluation, postoperative control and evaluation for implantation. Conclusion: Applications ofCBCT at Bauru School of Dentistry (USP-Brazil) in the given period in the current study wereconsistent with the indications established by the scientific literature. Filling out the applicationto perform the service is still not a common practice and mechanisms for the clarification ofthe service users...


Assuntos
Humanos , Diagnóstico , Radiografia/métodos , Radiografia , Tomografia Computadorizada de Feixe Cônico/métodos , Tomografia Computadorizada de Feixe Cônico , Tomografia/métodos , Tomografia
14.
Braz Oral Res ; 282014.
Artigo em Inglês | MEDLINE | ID: mdl-25229785

RESUMO

The aim of this study was to determine the efficacy of pixel value analysis using images generated by the Digora™ and Visualix™ systems for the early detection of external root resorption (ERR). Thirty extracted human lower incisors were radiographed using the Digora and Visualix systems; then, ERR was induced by immersing the teeth in 6 mol L-1 of hydrochloric acid for different periods of time (10, 30 and 60 minutes). ERR was confirmed by calcium quantification with an atomic absorption spectrophotometer. One digital image was acquired per time period at 70 kVp, 7 mA, 2.2 mm filtration, focus-film distance of 30 cm, and with exposure times of 0.09 s in the Digora system and 0.05 s in Visualix system. The region of interest was defined using ImageJ software. Statistical analysis was performed using ANOVA and Pearson's correlation (p < 0.05). There was no statistically significant difference between the time for ERR induction and the pixel values with either system. A positive correlation between the time of ERR induction and the calcium concentration was observed (r = 0.8892; p < 0.001). In conclusion, independent of the site of ERR induction and the digital system, pixel value analysis was not effective for ERR detection.


Assuntos
Radiografia Dentária Digital/instrumentação , Radiografia Dentária Digital/métodos , Reabsorção da Raiz/diagnóstico por imagem , Análise de Variância , Diagnóstico Precoce , Humanos , Incisivo/diagnóstico por imagem , Valores de Referência , Reprodutibilidade dos Testes , Espectrofotometria Atômica , Fatores de Tempo
15.
Case Rep Dent ; 2014: 803572, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25147745

RESUMO

Purpose. The aim of this paper is to report a case in which the cone beam computed tomography (CBCT) was important for the confirmation of the presence of mandibular atrophy and genial spines enlargement. Case Description. A 76-year-old female patient was referred for the assessment due to the complaint of chronic trauma in the anterior region of the floor of the mouth, which had been present for 2 months. CBCT images showed severe resorption of alveolar ridge and genial spines enlargement (5.5 mm × 12 mm). Conclusion. Accurate imaging assessment with the aid of 3D reconstructions allows the elimination of image superimposition and, therefore, plays an important role in the depiction of anatomical and pathological conditions, such as genial spines enlargement.

16.
Surg Radiol Anat ; 36(9): 915-24, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-24828124

RESUMO

PURPOSE: To provide more information to clinicians planning sinus grafting and maxillofacial surgical interventions, the present study evaluated the prevalence, diameter and location of the superior alveolar canals (SAC) using CBCT images. METHODS: The maxillary sinus CBCT scans (i-CAT Classic(®), ISI, USA) of 100 adult patients (67 women and 33 men) aged 20-79 years [mean (SD) 40 (15)] were examined. A dentomaxillofacial radiologist observed the SAC based on CBCT image data and more specifically the parasagittal views to assess SAC's diameter and location. RESULTS: The anterior and posterior SAC, double ASAC, intraosseous anastomoses and the extension of the anterior SAC to the piriform aperture were observed in 100, 73, 24.5, 38.5 and 84 % of the cases, respectively. The anastomosis was located between canine and first premolar in 43 % of the cases. The SAC diameters were in 80 % of the cases ≤1 mm, remaining canals had a diameter between 1 and 2 mm. The distance of the SAC to the alveolar crest ranged between 2.42 and 44.6 mm. The anterior SAC was more prevalent in the upper (53 %) and middle (44 %) thirds of the maxillary sinus, while the posterior SAC was more prevalent in the middle (36 %) and lower thirds (64 %). The distance was significantly bigger in men in some tooth positions. CONCLUSIONS: Based on the present findings, one-fifth of the patients may have a diameter of the SAC >1 mm, large enough to cause bleeding and/or paraesthesia. CBCT imaging may assist surgeons to plan grafting and osteotomy procedures, while avoiding these neurovascular structures.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Implantes Dentários , Seio Maxilar/irrigação sanguínea , Seio Maxilar/diagnóstico por imagem , Cuidados Pré-Operatórios/métodos , Levantamento do Assoalho do Seio Maxilar , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Planejamento de Assistência ao Paciente , Adulto Jovem
17.
Case Rep Dent ; 2014: 707261, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-24707410

RESUMO

Purpose. The aim of this paper is to report a case in which the cone beam computed tomography (CBCT) was important for the confirmation of the presence of maxillary sinus septum and, therefore, the absence of a suspected pathologic process. Case Description. A 27-year-old male patient was referred for the assessment of a panoramic radiograph displaying a radiolucent area with radiopaque border located in the apical region of the left upper premolars. The provisional diagnosis was either anatomical variation of the maxillary sinuses or a bony lesion. Conclusion. The CBCT was important for an accurate assessment and further confirmation of the presence of maxillary septum, avoiding unnecessary surgical explorations.

18.
Indian J Dent Res ; 25(1): 99-101, 2014 Jan-Feb.
Artigo em Inglês | MEDLINE | ID: mdl-24748309

RESUMO

We report two cases in which cone beam computed tomography (CBCT) was essential for the establishment of the diagnosis of periapical lesions. CBCT allows a three-dimensional assessment of a specific region with no superimposition of structures. Therefore, its use is recommended when radiographic images are not sufficient for the diagnosis.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Ápice Dentário/diagnóstico por imagem , Odontopatias/diagnóstico por imagem , Adulto , Feminino , Humanos , Masculino , Ápice Dentário/patologia
19.
Rev. odontol. UNESP (Online) ; 43(1): 72-76, Jan-Feb/2014. graf
Artigo em Inglês | LILACS-Express | ID: lil-707249

RESUMO

INTRODUCTION: Torus palatinus is a specific name to identify exostoses developed in the hard palate along the median palatine suture. Despite of not being a pathological condition, its presence requires attention and knowledge regarding its management. Surgical removal of exostoses is indicated when the patient frequently traumatizes the area of palatine torus during mastication and speech or when it is necessary for the rehabilitation of the upper arcade with complete dentures. OBJECTIVE: The aim of this article is to present three cases of Torus palatinus and to discuss the management of them. CASE REPORT: In the first case, a 57-year-old Caucasian man sought oral rehabilitation of his edentulous maxilla but presented a hard nodules in the hard palate; in the second case, a 40-year-old Caucasian woman was referred for frequent trauma of palatal mucosa during mastication, aesthetic complaint, and discomfort caused by the trauma of her tongue in this area; and in the third case, a 45-year-old Caucasian woman presented with a lesion on the palate that caused difficulty swallowing. When the Torus palatinus was impairing the basic physiological functions of the patients, all cases were surgically treated, improving the patients' quality of life. FINAL CONSIDERATION: The dentist should be properly prepared to choose the best from among the existing surgical approaches for each individual lesion in order to improve the results and avoid possible complications. .


INTRODUÇÃO: Torus palatinus é um nome específico usado para identificar exostoses no palato duro ao longo da sutura palatina mediana. Apesar de não ser considerado uma condição patológica, sua presença requer atenção e conhecimento no que diz respeito ao seu tratamento. A remoção cirúrgica de exostoses é indicada quando o paciente traumatiza frequentemente a área do Torus palatinus durante a mastigação e a fala, ou quando for necessária a reabilitação da arcada dentária superior com próteses totais. OBJETIVO: O objetivo deste trabalho é apresentar três casos de Torus palatinus e discutir os seus respectivos tratamentos. CASO CLÍNICO: O primeiro caso era de um homem leucoderma e com maxila edêntula que procurou reabilitação dentária, porém apresentou um nódulo no palato duro. O segundo caso era de uma mulher, leucoderma e de 40 anos que foi encaminhada devido ao trauma frequente na mucosa do palato durante a mastigação, insatisfação com a estética e desconforto causado pelo trauma na língua. O terceiro caso era de uma mulher de 45 anos de idade, leucoderma com uma lesão no palato e dificuldade pra engolir. Uma vez que o Torus palatinus estava prejudicando as funções fisiológicas básicas dos pacientes, todos os casos foram cirurgicamente tratados, melhorando a qualidade de vida dos mesmos. CONSIDERAÇÃO FINAL: O dentista deve estar preparado para selecionar a técnica cirúrgica mais indicada para cada caso buscando o melhor resultado e evitando possíveis complicações. .

20.
Clin Oral Implants Res ; 25(2): e94-9, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-23167944

RESUMO

OBJECTIVE: To investigate the presentation of accessory mental foramina (AMF) on cone-beam computed tomography (CBCT) and digital panoramic examinations (PAN). STUDY DESIGN: Imaging examinations (i.e., CBCT and PAN) of 100 patients (200 hemi-mandibles) were assessed. AMF prevalence, diameter, and location related to adjacent teeth and to the mental foramen (MF) were analyzed. RESULTS: On CBCT images, the AMF was observed in 3% of the patients: two unilateral cases and one bilateral case, with mean diameter of 0.93 mm (±0.3); no AMF was identified on PAN. Most AMF were located between the premolars, either superiorly (two cases) or mesially (two cases) to the MF. The mean horizontal distance to the corresponding MF was 2.3 mm (±1.0) and the mean vertical distance was 4.0 mm (±0.7). CONCLUSIONS: The results of this study suggest that CBCT is an effective tool for presurgical tridimensional assessment of the neurovascular structures, such as MF and its variations; On the other hand, PAN examinations were not able to show the AMF cases assessed on CBCT.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Mandíbula/diagnóstico por imagem , Radiografia Panorâmica , Adolescente , Adulto , Idoso , Feminino , Humanos , Masculino , Mandíbula/irrigação sanguínea , Mandíbula/inervação , Pessoa de Meia-Idade , Prevalência
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