ABSTRACT
Objective: To describe a clinical case that called for an anatomical post to be made to support and retain an indirect restoration in the anterior tooth. Case report: A 72-year-old female patient came to the office complaining that the crown of tooth 22 had come loose. A clinical and radiographic examination of element 22 was performed, and showed a very broad root canal, total displacement of the cast metal crown-core set, and satisfactory endodontic treatment. The restorative planning for this patient included the making of an anatomical post from Exacto # 2 fiberglass post (Angelus, Brazil), and refilling it with Bulk One composite resin (3M, USA), using self-adhesive resin cement U200 (3M, USA). The reconstruction of the coronary portion of the post was also performed with the same composite resin (Bulk One 3M, USA). The preparation for full crown and temporary restoration was performed in the same session, using self-curing acrylic resin. The all-ceramic crown was molded and cemented in subsequent sessions. Conclusion: The use of anatomical posts with composite resin represents a technically viable alternative for rehabilitating endodontically treated teeth with wide root canals, in cases where conventional prefabricated fiber posts cannot be adapted easily. The advantages that stand out are that these posts can be applied easily, at low cost, and in a single session.
Objetivo: Descrever um caso clínico de confecção do pino anatômico para suporte e retenção de restauração indireta em dente anterior. Relato do Caso: Paciente feminina, 72 anos, compareceu ao consultório queixando-se que a coroa do dente 22 havia "soltado". Realizou-se exame clínico e radiográfico do elemento 22, que apresentou conduto radicular bastante amplo, deslocamento total do conjunto núcleo/coroa e tratamento endodôntico satisfatório. O planejamento restaurador para essa paciente incluiu a confecção de pino anatômico, com pino de fibra de vidro Exato #2(Angelus, Brasil) reembasado com resina composta Bulk One (3M, EUA), utilizando o cimento resinoso autoadesivo U200 (3M, EUA). Foi realizada a reconstrução da porção coronária do pino também com resina composta do tipo Bulk. Realizou-se, na mesma sessão de atendimento, o preparo para coroa total e restauração provisória utilizando dente de estoque e resinaacrílica autopolimerizável. Em sessões seguintes foi realizada a moldagem e cimentação da coroa total em cerâmica pura. Conclusão: A utilização de pinos anatômicos com resina composta representa uma alternativa tecnicamente viável, de fácil aplicabilidade, com baixo custo e em única sessão, para reabilitação de dentes tratados endodonticamente com conduto radicular onde os pinos em fibra pré-fabricados convencionais não apresentam boa adaptação.
Subject(s)
Humans , Female , Aged , Post and Core Technique , Dental Pins , Dental Restoration, Permanent/instrumentation , Composite Resins , Dental Materials , GlassABSTRACT
Light transmission (LT) into deeper areas of the dentin root is limited. Aim: The aim of this study is to perform a quantitative investigation of the radial transmission of light (LT) through different fiber posts and its influence on the Knoop hardness number (KHN) and bond strength (BS) of a dual-cure self-adhesive resin cement at 3 different depths. Materials and Methods: Four types of fiber posts (2 translucent and 2 conventional) were used. LT and KHN analyses were performed in a specially designed matrix, which allowed measurements at 3 different depths. LT was measured using a volt-ampere meter while KHN tests were performed in a microhardness tester. For BS analysis, endodontically treated bovine roots were divided into 4 groups, each group receiving one type of post. After cementation, cross sections of the root were tested for resistance to displacement using a universal testing machine. Statistical Analysis Used: Statistical analysis was performed by using this ANOVA and Tukey's test. Results: For LT, translucent posts showed significantly higher values at all depths compared to the conventional ones. For all posts, LT decreased at the deeper depths. The KHN results showed no statistical differences among the different posts, regardless of depth. For BS, a translucent post showed the highest values, and comparative analyses between the different depths of posts also showed statistically significant differences while comparisons among the different depths of the same post showed no differences. Conclusions: LT depended on the type of post and on depth. The type of post did not significantly influence the cement KHN. A translucent post showed higher BS in pooled data.
ABSTRACT
Background: To assist the retention of restorations prepared in endodontically treated teeth, fiber posts are widely used in dental practice. The ideal time to prepare space for the post is still controversial. Aim: The purpose of this study was to evaluate the effects of immediate and delayed postspace preparation on the retention of the self‑adhesive resin cement. Materials and Methods: Twelve bovine teeth were used with sectioned roots standardized to 19 mm. The teeth were properly instrumented and filled with gutta‑percha and eugenol‑free cement AH Plus. Two experimental groups (n = 6) were created based on the different times of post preparation (immediate and delayed). Using cemented cylindrical fiber posts, the teeth were put in acrylic resin and polyvinyl chloride tubes, where the cuts were made. Two slices were obtained from the cervical third, two from the medium third and two from the apical third. Subsequently, the samples were subjected into push‑out tests. Statistical analysis were performed using ANOVA and Tukey’s test (P = 5%). Results: The results indicated that, for all of the evaluated thirds, delayed preparation showed greater bond strength than immediate preparation. Conclusion: A delayed post preparation of the root space, following the root canal filling, is recommended.
ABSTRACT
O objetivo deste estudo foi avaliar a quantidade de luz transmitida (LT) em cerâmicas (com diferentes composições e associações, espessuras e cores), a microdureza Vickers (VNH) de um cimento de dupla polimerização e desenvolver um equipamento para determinação da intensidade luminosa e do tempo para a fotoativação de cimentos de restaurações odontológicas indiretas. Foram utilizados discos de cerâmica reforçadas com leucita, dissilicato de lítio, à base de zircônia e feldspáticas, com dimensões de 10 mm de diâmetro e espessuras de 2 e 5 mm nas cores A2 e A4. Associções entre os quatro tipos, duas cores e duas espessuras dessas cerâmicas totalizaram dezesseis grupos testes para LT e dezesseis grupos testes e um controle para VHN. O medidor de potência utilizado para as leituras de LT foi o Thorlabs PM 30 (Thorlabs Gmbh, Alemanha). O aparelho fotoativador utilizado foi um Radii-Cal (SDI)...
Subject(s)
Humans , Ceramics , Curing Lights, Dental , Light-Curing of Dental Adhesives , Metal Ceramic Alloys , Resin Cements , Hardness Tests/methodsABSTRACT
A previsibilidade de trabalhos restauradores estéticos, sejam eles diretos ou indiretos, é reconhecidamente um dos maiores desafios ao cirurgião-dentista, principalmente em casos de facetas indiretas ou coroas unitárias. Atualmente, estão disponíveis no mercado odontológico cimentos de resina com grande diversidade quanto a tipo de presa e cores. Com respeito à diversidade de cores, podem ser utilizados cimentos de diferentes matizes, opacidade e viscosidade, a fim de realizar pequenas correções em função do substrato a ser mascarado ou da própria restauração. Para decidir a cor mais adequada a ser utilizada em cada caso, utilizamse as chamadas pastas simuladoras ou tryin. Essa opção consiste em pastas matizadas não polimerizáveis, hidrossolúveis, cujas cores correspondem a seu respectivo cimento, permitindo que haja previsão do resultado estético final.