Carcinoma epidermóide no seio maxilar: Uma revisão analítica da literatura

O carcinoma epidermóide do seio maxilar é um tumor maligno incomum de origem epitelial que é diagnosticado quase sempre em uma fase tardia da doença, sendo assim de difícil tratamento e propenso à sequelas debilitantes. A faixa etária mais acometida é a sexta e sétima década de vida e o gênero masculino o mais afetado. O aspecto histopatológico é o mesmo descrito para esta lesão em outros sítios da cabeça e pescoço. Acredita-se ser causado por carcinógenos ambientais que atuaram por longo período de tempo sobre a mucosa sinusal. Em sua fase inicial apresentam sinais e sintomas inespecíficos semelhantes a uma inflamação crônica. Exames por imagem são fundamentais para avaliar a localização e extensão da doença. O tratamento envolve cirurgia, radioterapia e quimioterapia isolados ou em conjunto. O patologista oral deve conhecer esse tumor como forma de considerá-lo no diagnóstico de lesões que atingem os seios maxilares e ainda podem ter extensão para a cavidade oral

Importance of cone beam computed tomography for diagnosis of calcifying cystic odontogenic tumour associated to odontoma : report of a case

The calcifying cystic odontogenic tumour (CCOT) is a rare benign cystic neoplasm not infrequently associated with odontoma. This report documents a case of CCOT associated with compound odontoma arising in the anterior maxilla in a 25-year-old woman. Conventional radiographs showed a large calcified mass with poorly visualized radiolucent margins. The extent and condition of the internal structure of the CCOT associated with odontoma was able to be determined based on radiographic findings from cone beam computed tomography. This advanced image technique proved to be extremely useful in the radiographic assessment of this particular neoplasm of the jawbones

Pre-heating mitigates composite degradation

Dental composites cured at high temperatures show improved properties and higher degrees of conversion; however, there is no information available about the effect of pre-heating on material degradation. Objectives This study evaluated the effect of pre-heating on the degradation of composites, based on the analysis of radiopacity and silver penetration using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS). Material and Methods Thirty specimens were fabricated using a metallic matrix (2x8 mm) and the composites Durafill VS (Heraeus Kulzer), Z-250 (3M/ESPE), and Z-350 (3M/ESPE), cured at 25°C (no pre-heating) or 60°C (pre-heating). Specimens were stored sequentially in the following solutions: 1) water for 7 days (60°C), plus 0.1 N sodium hydroxide (NaOH) for 14 days (60°C); 2) 50% silver nitrate (AgNO3) for 10 days (60°C). Specimens were radiographed at baseline and after each storage time, and the images were evaluated in gray scale. After the storage protocol, samples were analyzed using SEM/EDS to check the depth of silver penetration. Radiopacity and silver penetration data were analyzed using ANOVA and Tukey’s tests (α=5%). Results Radiopacity levels were as follows: Durafill V

Occurrence of maxillary sinus abnormalities detected by cone beam CT in an asymptomatic patient

Made available in DSpace on 2014-07-29T15:21:57Z (GMT). No. of bitstreams: 1 Dissertacao Inara Rege.pdf: 692781 bytes, checksum: a7cf62e7e8ab3529ac5b269f1d1f915c (MD5) Previous issue date: 2011-03-18The use of cone beam computed tomography exam (CBCT) has increased greatly in recent years in dentistry, so there is much discussion about the role of the dentist in evaluating the anatomical structures near the maxillo-mandibular. Currently we do not know the occurrence of abnormalities in the maxillary sinuses in a large sample of CBCT examinations of dental patients with different indications. The aim of this study was 1-to investigate the occurrence of maxillary sinus abnormalities using cone beam computed tomography (CBCT) exams of asymptomatic patients, 2- identify the frequency, type and location of these findings, and 3- its association with the proximity of periapical lesions and inflammatory changes in the maxillary sinus.1113 CBCT exams were evaluated by two examiners to identify the presence or absence of abnormalities of the maxillary sinus. Cases with abnormalities were reevaluated for identification of the type of the abnormality and location within the sinus. The presence and proximity of periapical lesions in the upper posterior teeth to the lower sinus wall were recorded. Data were analyzed using descriptive statistics and chi-square test. Inter-rater agreement was calculated using Kappa statistics. Abnormalities were diagnosed in 760 (68.2%) cases (kappa coefficient 0.83). There was a significant difference between genders, showing greater occurrence in males (p0.05). Mucosal thickening was the most prevalent abnormality (66%), followed by retention cyst (10.1%) and opacification (7.8%). The most frequent location of sinusal abnormalities were in the inferior wall (46.2%), anterior (29%), medial(25.7%) and lateral wall (21.5%). No association between the proximity of periapical lesion and the presence and type of inflammatory abnormalities was observed (p=0.124). The occurrence of abnormalities in maxillary sinus of asymptomatic was considered high. These findings emphasize the importance of a comprehensive interpretation by the dentomaxillofacial radiologist of all volume of CBCT images, including the entire maxillary sinus as part of the imaging exam of routine patients.A utilização do exame de tomografia computadorizada por feixe cônico (TCFC) tem aumentado muito nos últimos anos na Odontologia, com isso, muito se discute sobre o papel do cirurgião-dentista na avaliação de estruturas anatômicas próximas ao complexo maxilo-mandibular. Atualmente não se conhece a ocorrência de anormalidades nos seios maxilares em uma grande amostra de exames de TCFC de pacientes com diferentes indicações odontológicas. O objetivo deste estudo foi investigar: 1-ocorrência de anormalidades no seio maxilar por meio de exames de TCFC de pacientes assintomáticos, 2-identificar a frequência, tipo e localização destas anormalidades, e 3- sua associação com a proximidade de lesões periapicais e alterações inflamatórias detectadas no seio maxilar.1113 exames de TCFC foram avaliados por dois examinadores para identificar a presença ou ausência de anormalidades do seio maxilar. Os casos com anormalidades foram reavaliados para a identificação do tipo de anormalidade e localização no interior da cavidade sinusal. A presença e a proximidade das lesões periapicais em dentes superiores posteriores à parede inferior do seio foram registrados. Os dados foram analisados por estatística descritiva e teste do qui-quadrado. A concordância entre os examinadores foi calculada por meio da estatística Kappa. Anormalidades foram diagnosticadas em 760 pacientes (68,2%) (kappa 0,83 coeficiente). Houve diferença significante entre os sexos, com maior ocorrência no gênero masculino (p <0,001). Não houve diferença na ocorrência de anormalidades em relação às faixas etárias (p <0,05). Espessamento mucoso foi a alteração mais prevalente (66%), seguido de cisto de retenção (10,1%) e opacificação (7,8%). As localizações mais frequentes de anormalidades sinusais foram na parede inferior (46,2%), anterior (29%), média (25,7%) e parede lateral (21,5%). Não foi observada associação entre a proximidade da lesão periapical e presença e tipo de anormalidades inflamatórias (p = 0,124). A ocorrência de anormalidades no seio maxilar de assintomáticos foi considerada alta. Estes achados enfatizam a importância de uma interpretação abrangente pelo radiologista dentomaxillofacial de todo o volume de imagens de TCFC, incluindo todo o seio maxilar, como parte do exame de imagem dos pacientes de rotin

Diagnosis of dental ankylosis: challenges using cone beam computed tomography

Submitted by JÚLIO HEBER SILVA ([email protected]) on 2018-06-21T12:03:10Z No. of bitstreams: 2 Tese - Inara Carneiro Costa Rege - 2018.pdf: 2470495 bytes, checksum: 12626c31e79d42e9a2f2b76a453324bf (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira ([email protected]) on 2018-06-27T10:59:24Z (GMT) No. of bitstreams: 2 Tese - Inara Carneiro Costa Rege - 2018.pdf: 2470495 bytes, checksum: 12626c31e79d42e9a2f2b76a453324bf (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Made available in DSpace on 2018-06-27T10:59:24Z (GMT). No. of bitstreams: 2 Tese - Inara Carneiro Costa Rege - 2018.pdf: 2470495 bytes, checksum: 12626c31e79d42e9a2f2b76a453324bf (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2018-04-09Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEGDental ankylosis is the fusion of dental tissue (dentin and cementum) to alveolar bone without the presence of the periodontal ligament (PDL), which can progress to replacement resorption. Cone-beam computed tomography (CBCT) has been prescribed for the evaluation of unerupted teeth, and ankylosis is an important characteristic to be observed in the analysis of these teeth. The objective of this research was to establish diagnostic criteria, using pixel intensity in CBCT and associate with clinical and demographic factors. The pixel intensity value was performed by two analyzes. The first (analyze 1) evaluated the mean pixel intensity in different regions of the dento-alveolar complex in normal and ankylosis areas. The second (analyze 2) was observed the variation of pixel intensity values in two normal areas and one of ankylosis. Data were analyzed statistically by means of absolute and relative frequency measurements; odds ratio, Chi-square. The t-test was used to compare the means of pixel intensity. One hundred and fifty-seven CBCT exams of individuals with unerupeted or partially erupted teeth with suspected ankylosis were evaluated, totaling 206 teeth. Fifty-seven teeth (27.6%) had a presumptive diagnosis of ankylosis and were evaluated using pixel intensity value. In analysis 1, it was observed that the values of alveolar bone in the normal and ankylosis areas, practically have the same variability of pixel intensity value (t-test = 0.07). When comparing the density of normal PDL with the ankylosis area, a higher density is observed (t-test p <0.001). When compared to the alveolar bone interface with PDL and alveolar bone with ankylosis area, it is observed that the intensity of the pixels in the ankylosis region is greater than in the normal area (t-test p <0.001). In analysis 2, it was observed that there was a marked reduction of pixel intensity value in the PDL area, which did not occur in the ankylosis areas. Considering the clinical and demographic factors, the occurrence in individuals over 20 years old was 72.5%, and less or equal to 20 years was 27.5% (odds ratio 1.8 95% CI 0.87-3.73), and 77.2% (n = 44) were in the upper arch. The mesioangular inclination was observed in 49.1% (n = 28), and the association between impaction and dental ankylosis was not observed (p = 0.44 Chi-square). The cervical and middle thirds of root were the most affected, 38.6% and 35.1%, respectively. It was possible to observe ankylosis in 22 teeth (38.6%) in three multiplanar reconstructions. In summary, the results suggest that the CBCT examination allows the diagnosis of ankylosis and the analysis of the pixel intensity values and their variability are an important digital tool for the interpretation and diagnosis process.Anquilose dentária constitui uma desordem, em que ocorre a fusão total ou parcial do cemento ou dentina ao osso alveolar, pela ausência do ligamento periodontal (LPD), podendo evoluir para a reabsorção por substituição. O exame de tomografia computadorizada por feixe cônico (TCFC) tem sido prescrito para a avaliação de dentes não irrompidos, sendo a anquilose uma característica importante a ser observada na análise desses dentes. O objetivo desta pesquisa foi estabelecer critérios de diagnóstico, utilizando intensidade de pixel em TCFC e associar com fatores clínicos e demográficos. A análise de intensidade de pixel foi realizada por meio de duas análises. A primeira (análise 1) avaliou a média de intensidade de pixel em diferentes regiões do complexo dento-alveolar em áreas normais e de anquilose. A segunda (análise 2) observou a variação dos valores de intensidade de pixel em duas áreas normais e uma de anquilose. Os dados foram analisados estatisticamente por meio de medidas de análise de frequência absoluta e relativa; odds ratio, Qui-quadrado. O teste-t foi utilizado para comparação das médias de intensidade de pixel. Cento e cinquenta e sete exames TCFC de indivíduos com dentes não irrompidos ou parcialmente irrompidos e com suspeita de anquilose, foram avaliados, totalizando 206 dentes. Cinquenta e sete dentes (27,6%) possuíam diagnóstico presuntivo de anquilose, e foram avaliados por meio da intensidade de pixel. Na análise 1, observou-se que os valores de osso alveolar na área normal e de anquilose, possuem praticamente a mesma variabilidade de intensidade de cinza (Teste-t p=0,07). Quando comparado a densidade do LPD normal com a área de anquilose, observa-se uma maior densidade (Teste-t p<0,001). Quando comparado a interface osso alveolar com LPD e osso alveolar com área de anquilose, observase que a intensidade dos pixels na região da anquilose é maior do que da área normal (Teste-t p<0,001). Na análise 2, observou-se que havia uma redução acentuada da intensidade de pixel na área do LPD, o que não ocorreu nas áreas de anquilose. Considerando os fatores clínicos e demográficos, a ocorrência em pacientes acima de 20 anos foi de 72,5%, e menor ou igual a 20 anos foi de 27,5% (Odds ratio 1,8 IC95% 0,87-3,73), sendo que 77,2% (n=44) foi localizada na arcada superior. A inclinação mesioangular foi observada em 49,1% (n=28), e não foi constatada a associação entre impacção e anquilose dentária (p=0,44 Quiquadrado). Os terços cervical e médio radiculares foram os mais acometidos, 38,6% e 35,1%, respectivamente. Foi possível observar anquilose em 22 dentes (38,6%), em três reconstruções multiplanares. Em síntese, os resultados sugerem que o exame de TCFC permite o diagnóstico de anquilose e a análise dos valores de pixel e sua variabilidade, constituem uma ferramenta auxiliar importante para o processo de interpretação e diagnóstico

Pre-heating mitigates composite degradation

Submitted by Luciana Ferreira ([email protected]) on 2018-12-07T13:31:48Z No. of bitstreams: 2 Artigo - Jessika Calixto da Silva - 2015.pdf: 538109 bytes, checksum: b78ca7b11a5a7c0af4aea49f689bd1e3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira ([email protected]) on 2018-12-07T14:52:01Z (GMT) No. of bitstreams: 2 Artigo - Jessika Calixto da Silva - 2015.pdf: 538109 bytes, checksum: b78ca7b11a5a7c0af4aea49f689bd1e3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Made available in DSpace on 2018-12-07T14:52:01Z (GMT). No. of bitstreams: 2 Artigo - Jessika Calixto da Silva - 2015.pdf: 538109 bytes, checksum: b78ca7b11a5a7c0af4aea49f689bd1e3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2015D ental composites cured at high temperatures show improved properties and higher degrees of conversion; however, there is no information available about the effect of pre-heating on material degradation. Objectives: This study evaluated the effect of pre- heating on the degradation of composites, based on the analysis of radiopacity and silver penetration using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS). Material and Methods: Thirty specimens were fabricated using a metallic matri[ ( [ mm) and the composites Dura¿ll 9S (+eraeus .ul]er), =- ( M/ESPE), and Z-350 (3M/ESPE), cured at 25°C (no pre-heating) or 60°C (pre-heating). Specimens were stored sequentially in the following solutions: 1) water for 7 days (60°C), plus 0.1 N sodium hydroxide (NaOH) for 14 days (60°C); 2) 50% silver nitrate (AgNO 3 ) for 10 days (60°C). Specimens were radiographed at baseline and after each storage time, and the images were evaluated in gray scale. After the storage protocol, samples were analyzed using SEM/EDS to check the depth of silver penetration. Radiopacity and silver penetration data were analyzed using ANOVA and Tukey’s tests (D=5%). Results: Radiopacity levels were as follows: Dura¿ll VS Z-350 Z-250 (p 0.05). The depth of silver penetration into the composites ranked as follows: Dura¿ll VS!Z-350!Z-250 (p 0.05). After storage in water/ NaOH, pre-heated specimens presented higher radiopacity values than non-pre-heated specimens (p<0.05). There was a lower penetration of silver in pre-heated specimens (p<0.05). Conclusions: Pre-heating at 60°C mitigated the degradation of composites based on analysis of radiopacity and silver penetration depth

Occurrence of maxillary sinus abnormalities detected by cone beam CT in asymptomatic patients

<p>Abstract</p> <p>Background</p> <p>Although cone beam computed tomography (CBCT) images of the maxillofacial region allow the inspection of the entire volume of the maxillary sinus (MS), identifying anatomic variations and abnormalities in the image volume, this is frequently neglected by oral radiologists when interpreting images of areas at a distance from the dentoalveolar region, such as the full anatomical aspect of the MS. The aim of this study was to investigate maxillary sinus abnormalities in asymptomatic patients by using CBCT.</p> <p>Methods</p> <p>1113 CBCT were evaluated by two examiners and identification of abnormalities, the presence of periapical lesions and proximity to the lower sinus wall were recorded. Data were analyzed using descriptive statistics, chi-square tests and Kappa statistics.</p> <p>Results</p> <p>Abnormalities were diagnosed in 68.2% of cases (kappa = 0.83). There was a significant difference between genders (p < 0.001) and there was no difference in age groups. Mucosal thickening was the most prevalent abnormality (66%), followed by retention cysts (10.1%) and opacification (7.8%). No association was observed between the proximity of periapical lesions and the presence and type of inflammatory abnormalities (p = 0.124).</p> <p>Conclusions</p> <p>Abnormalities in maxillary sinus emphasizes how important it is for the dentomaxillofacial radiologist to undertake an interpretation of the whole volume of CBCT images.</p