RESUMO

The aim of this study was to compare two endodontic preparation systems using micro-CT analysis. Twenty-four one-rooted mandibular premolars were selected and randomly assigned to two groups. The samples (n = 12) of Group 1 were prepared using the ProTaper Universal rotary system, while Group 2 (n = 12) was prepared using the EndoEZE AET system complemented by manual apical preparation with K-type hand files up to #30. A 2.5% sodium hypochlorite solution was used in both groups for irrigating. Both groups were scanned by high-resolution microcomputed tomography before and after preparation (SkyScan 1172, SkyScan, Kontich, Belgium). The root canal volume and surface area was measured before and after preparation, and the differences were calculated and analyzed for statistically significant differences using ANOVA complemented by the Tukey test (p < 0.05). The results showed no statistically significant differences between the mean volumes of dentin removal by the two systems. However, the EndoEZE AET system presented a significantly greater mean surface area compared to the ProTaper system (p < 0.05). The EndoEZE AET system enabled preparation of a greater root canal surface area when compared to the ProTaper Universal system. There seemed to be no difference in dentin volume loss between the two systems used.

Assuntos

RESUMO

The aim of this study was to compare two endodontic preparation systems using micro-CT analysis. Twenty-four one-rooted mandibular premolars were selected and randomly assigned to two groups. The samples (n = 12) of Group 1 were prepared using the ProTaper Universal rotary system, while Group 2 (n = 12) was prepared using the EndoEZE AET system complemented by manual apical preparation with K-type hand files up to #30. A 2.5% sodium hypochlorite solution was used in both groups for irrigating. Both groups were scanned by high-resolution microcomputed tomography before and after preparation (SkyScan 1172, SkyScan, Kontich, Belgium). The root canal volume and surface area was measured before and after preparation, and the differences were calculated and analyzed for statistically significant differences using ANOVA complemented by the Tukey test (p < 0.05). The results showed no statistically significant differences between the mean volumes of dentin removal by the two systems. However, the EndoEZE AET system presented a significantly greater mean surface area compared to the ProTaper system (p < 0.05). The EndoEZE AET system enabled preparation of a greater root canal surface area when compared to the ProTaper Universal system. There seemed to be no difference in dentin volume loss between the two systems used.

Assuntos

RESUMO

This in vivo study evaluated the dissociation quality of maxillary premolar roots combining variations of vertical and horizontal angulations by using X-ray holders (Rinn -XCP), and made a comparison between two types of intraoral radiography systems - conventional film (Kodak Insight, Rochester, USA) and digital radiography (Kodak RVG 6100, Kodak, Rochester, USA). The study sample was comprised of 20 patients with a total of 20 maxillary premolars that were radiographed, using the paralleling angle technique (GP), with a 20º variation of the horizontal angle (GM) and 25º variation of the horizontal angle combined with 15º vertical angle (GMV). Each image was independently analyzed by two experienced examiners. These examiners assigned a score to the diagnostic capability of root dissociation and the measurement of the distance between the apexes. Statistical data was derived using the Wilcoxon Signed Rank test, Friedman and T test. The means of the measured distances between buccal and lingual root apexes were greater for the GMV, which ranged from 2.3 mm to 3.3 mm. A statistically significant difference was found between GM and GMV when compared to GP with p < 0.01. An established best diagnostic dissociation roots image was found in the GMV. These results support the use of the anterior X-ray holders which offer a better combined deviation (GMV) to dissociate maxillary premolar roots in both radiography systems.

Assuntos

RESUMO

This in vivo study evaluated the dissociation quality of maxillary premolar roots combining variations of vertical and horizontal angulations by using X-ray holders (Rinn -XCP), and made a comparison between two types of intraoral radiography systems - conventional film (Kodak Insight, Rochester, USA) and digital radiography (Kodak RVG 6100, Kodak, Rochester, USA). The study sample was comprised of 20 patients with a total of 20 maxillary premolars that were radiographed, using the paralleling angle technique (GP), with a 20º variation of the horizontal angle (GM) and 25º variation of the horizontal angle combined with 15º vertical angle (GMV). Each image was independently analyzed by two experienced examiners. These examiners assigned a score to the diagnostic capability of root dissociation and the measurement of the distance between the apexes. Statistical data was derived using the Wilcoxon Signed Rank test, Friedman and T test. The means of the measured distances between buccal and lingual root apexes were greater for the GMV, which ranged from 2.3 mm to 3.3 mm. A statistically significant difference was found between GM and GMV when compared to GP with p < 0.01. An established best diagnostic dissociation roots image was found in the GMV. These results support the use of the anterior X-ray holders which offer a better combined deviation (GMV) to dissociate maxillary premolar roots in both radiography systems.

Assuntos

RESUMO

O objetivo deste estudo in vivo foi investigar as imagens obtidas por microtomografia computadorizada (micro-TC) no estudo da anatomia apical de dentes humanos portadores de polpa viva e mortificada. Trinta e cinco dentes humanos unirradiculares ou multirradiculares que tiveram suas raízes separadas totalizando quarenta e uma raízes foram rigorosamente pré-selecionadas e divididas em dois grupos: com polpa viva (PV) n = 21 e com polpa mortificada (PM) n = 20. Os dentes de ambos os grupos foram escaneados pelo sistema de microtomografia computadorizada (SkyScan 1172) com resolução de 6,7m e suas imagens reconstruídas para a análise da região apical nos cortes sagital e coronal. O diâmetro do forame apical (FA) e da junção cemento-dentina (JCD) foram medidos bem como suas distâncias (extensão do cemento) em ambos os lados da raiz. Posteriormente a coroa dos dentes foi cortada no seu colo anatômico e suas raízes foram medidas com paquímetro eletrônico e a odontometria realizada com localizador eletrônico apical (RomiApex A15). A subtração desses dois dados foi correlacionada com as medidas obtidas pela micro-TC na avaliação da posição da JCD. As raízes foram preparadas para avaliação histológica em cortes longitudinais de 6m de espessura e corados com HE. Os cortes que apresentaram a emergência do FA foram fotografados digitalmente e as imagens correspondentes de micro-TC foram sobrepostas com o intuito de ilustrar a metodologia utilizada. As medidas da micro-TC foram realizadas por dois examinadores devidamente instruídos. A concordância inter-examinadores foi confirmada pelo coeficiente de correlação intraclasse (ICC) e as medidas foram comparadas pelo teste de Mann-Whitney (teste de Wilcoxon rank sum - p0,05)...

This ex vivo study aimed to investigate the apical anatomy of vital and necrotic human roots by microcomputed tomography (micro-CT). Thirty-five single or multirooted human teeth that had their roots separated totaling forty-one roots were carefully pre-selected and divided into two groups: vital pulp (VP) n = 21 and necrotic pulp (NP) n = 20. Both groups were scanned by microcomputed tomography system (SkyScan 1172) with 6.7m resolution and the apical region was analyzed by reconstructed images in sagittal and coronal sections. The diameters of the apical foramen (AF) and root canal at the cemento-dentino canal junction (CDJ) were measured. The cementum extension into the root canal was measured on both sides of the root canal. Thereafter the teeth crown was cut at the cemento-enamel junction, the length of roots was measured with a caliper and the working length was performed by an electronic apex locator (RomiApex A15). The result of the subtraction of these two data was correlated with measures obtained by micro-CT in the evaluation of CDJ position. The roots were sectioned in longitudinal histological sections of 6m thickness and stained with HE. The sections that showed the emergence of the FA were digitally photographed and the corresponding micro-CT sections were correlated by superimposition in order to illustrate the methodology. Measures of micro-CT scans were performed by two calibrated examiners. The interexaminers agreement was confirmed by intraclass correlation coefficient (ICC) and measurements were compared by Mann-Whitney test (Wilcoxon rank sum test - p0.05)...

Assuntos

RESUMO

O presente trabalho relata a história clínica de uma paciente de 37 anos de idade, que se apresentou a Universidade Paulista (UNIP), queixando-se de uma "espinha no queixo que não sarava". O exame radiográfico mostrou uma extensa área radiolúcida envolvendo os dentes anteriores, que através do mapeamento com cone de guta-percha e radiografia, detectou-se que a espinha no queixo era uma fístula extra-oral associada ao dente 41. O tratamento proposto foi o endodôntico com curativos à base de hidróxido de cálcio. Durante o tratamento deste dente, a paciente se queixou de uma "bolinha" na região lingual. Com novo mapeamento constatou-se outra fístula, intra-oral, correspondente a uma lesão periapical no dente 34. Foi proposto o mesmo procedimento com curativos à base de hidróxido de cálcio. Observou-se o desaparecimento das duas fístulas. O tratamento endodôntico à base de curativos de hidróxido de cálcio foi eficaz e a proservação foi necessária para acompanhar a reparação neste tipo de patologia.

The present study relates a clinical history of a 37 years old patient that presented to the University Paulista (UNIP) reporting "a pimple in her chin that never dried". A radiographic exam showed a large radiolucense area involving the anterior teeth that traced with a gutapercha point showed that it was an extraoral fistula, concerning the 41 tooth. The treatment proposed was the endodontic with intracanal medication of calcium hydroxide. During the treatment the patient reported a pimple in the lingual region. With a new traced radiography, it was constacted another fistula, intraoral, corresponding to a periapical lesion in the 34 tooth. It was proposed the same treatment with calcium hydroxide. It was observed the cure of the both fistulas. The endodontic treatment with intracanal medication of calcium hydroxide was effective and it was necessary to accompany the cure in this patology.

Assuntos

RESUMO

Introdução - O computador tornou-se uma necessidade no mundo em que vivemos, e o ensino representado pela universidade, na missão de preparar o aluno para a carreira profissional, sente a responsabilidade de não fechar os olhos para essa realidade. Atualmente, a presença da informática na didática de ensino representa novas configurações e metodologias para a condução do processo de ensino e aprendizado, bem como a difusão das diferentes formas de conhecimentos. No desenvolvimento da computação, a hipermídia retrata com fidelidade, som, texto, imagem e animação. Aplicados em sala de aula esses recursos caracterizam interatividade e interferência na seqüência de apresentações. Frente a esta nova temática, o presente estudo teve como objetivo a introdução de um CD-ROM como coadjuvante no estudo da Endodontia, especificamente a técnica endodôntica, a fim de verificar os benefícios da hipermídia dentro do contexto educacional. Material e Métodos - A hipermídia em formato de CD-ROM foi desenvolvida a partir da coleta de todo material endodôntico, bem como o tratamento das mídias com auxílio de softwares específicos. Possibilitando assim, a realização de um arquivo auto-executável quando inserido no drive do computador, permitindo uma navegação da hipermídia de forma não linear pelo usuário. Resultados- A avaliação do CD-ROM foi realizada com alunos da disciplina de Endodontia onde foi verificada a sua aplicabilidade. Conclusão - Os resultados estatísticos mostraram que o uso da hipermídia pode ser uma ferramenta motivadora no ensino da Endodontia

Assuntos

RESUMO

Introdução - O objetivo deste estudo foi avaliar a radiopacidade de diferentes cimentos endodônticos através do Sistema de Radiovisiografia - RVG-ui, com as ferramentas do próprio sistema, no intuito de facilitar a interpretação radiográfica. Materiais e Métodos - Cinco amostras de cimentos - N-Rickert (Fórmula e Ação), Intrafill (SSWhite), AH Plus (Dentsply), Endorez (Ultradent) e Epiphany (Pentron) foram radiografadas em um sistema de radiografia digital direta - o RVG-ui (Trophy Radiologie, França). As imagens digitais foram então examinadas por ferramentas fornecidas pelo próprio sistema, a análise densitométrica em número de pixels e dos pontos de equidensidade em cores, comparando os resultados fornecidos por elas. Resultados - Todos os cimentos apresentaram uma radiopacidade superior a aquela requeridas pela norma ISO 6876 - 2001. A diferença entre os resultados foi pequena, mostrando que clinicamente, seria difícil a diferenciação entre as amostras. No entanto, a comparação dos resultados mostrou que os cimentos N-Rickert e Epiphany apresentaram maior e menor radiopacidade, respectivamente, e o Endodez a menor homogeneidade. Conclusões - O Sistema de Radiovisiografia, RVG-ui, fornece ferramentas excelentes para avaliar a radiopacidade das imagens radiográficas

Assuntos