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INTRODUCTION: Cracked teeth frequently require protective adhesive restorations. This long-term, longitudinal retrospective clinical study aimed to evaluate the factors influencing the success and survival rates of cracked teeth with crack lines (CLs) in different directions when restored early with onlays or full-coverage crowns. METHODS: The dental records of 71 patients with a total of 86 cracked teeth with different pulpal and periapical diagnoses and with follow-ups spanning over 1-11 years were included. Data regarding the demographics; clinical symptoms and signs; bruxism; occlusal interferences; eating habits; pulpal and periapical diagnoses; number, direction, location, and extent of CLs; probing depth; and coronary condition before and after the placement of definitive restorations were collected. Univariate associations between tooth survival and explanatory variables were assessed. The long-term survival rate was estimated using Kaplan-Meier analysis and the log-rank test. A multivariate analysis was performed using Cox regression analysis. RESULTS: The overall success rate was 93.0%, and the overall survival estimates of cracked teeth restored early were 98.6%, 94.9%, and 55.9% at the 1-, 5-, and 11-year follow-ups, respectively. The direction of the CLs did not influence the survival of the tooth. No significant association was observed between the type of tooth, probing depth, root canal treatment, and tooth loss (P > .05). The multivariate analysis showed that previously treated cracked teeth (P < .05), the provision of onlay restorations (P < .05), and the placement of posts (P < .05) had higher correlations with tooth loss. Additionally, the placement of full-coverage crowns resulted in lower tooth loss compared with the placement of onlays (P < .05). CONCLUSIONS: Previous endodontic treatment in teeth that subsequently develop CLs has a negative impact on the survival rate of the teeth. Moreover, early placement of full-coverage crowns should be implemented for cracked teeth regardless of the direction or the number of CLs because it is associated with a higher cracked tooth survival rate.

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OBJECTIVES: The aim of this study was to assess the presence of enamel craze lines (ECLs), part of the spectrum of the so-called cracked tooth syndrome, on the surface of teeth irradiated in vivo. STUDY DESIGN: Forty teeth extracted from patients with head and neck cancer were paired, matched, and equally divided into 4 groups: noncarious irradiated (G1); noncarious control (G2); radiation-related caries (RRC) (G3), and carious control (G4). Samples were examined for ECL detection with a fiberoptic transillumination device and photographed, and ECL mean size, number, and patterns of topographic distribution in tooth crown were determined. Groups were compared accordingly: G1 versus G2; G3 versus G4. RESULTS: We analyzed 538 ECLs, of which 30.1% were found in noncarious irradiated teeth, 19.3% in noncarious controls, 27.6% in RRC, and 23% in carious controls. Non-carious irradiated teeth presented higher quantities of ECL than non-carious control (P < 0.05). Higher incidences of ECLs were identified in specific enamel topographies of anterior G1 and G3 samples (P <.05). There was no correlation between ECL size/numbers and radiation isodose delivery to teeth. CONCLUSIONS: Increased incidence of ECLs may indicate weakened enamel structure in irradiated teeth, and this may play a role in the onset and progression of RRC.

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The digital workflow in dentistry allows for complete digital processing of the restoration starting with the digital impression using an intraoral scanner to until the fabrication of final reconstruction. Recent advances in 3D printing technologies opened new possibilities also for dental technicians through which wax-up and casting procedures in the laboratories could be eliminated. In this clinical report, a technique is described where the pattern was fabricated using additive manufacturing for pressed lithium disilicate onlay restorations. (AU)

O fluxo de trabalho digital em odontologia permite o processamento digital completo da restauração começando com a impressão digital usando um scanner intraoral até a fabricação da peça final. Os avanços recentes nas tecnologias de impressão 3D abriram novas possibilidades também para os técnicos em prótese dentária através dos quais os procedimentos de cera e fundição nos laboratórios poderiam ser eliminados. Neste relato de caso clínico, descreve-se uma técnica onde o padrão foi fabricado usando a fabricação de aditivos para restaurações do tipo onlay em dissilicato de lítio injetadas. (AU)

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UNLABELLED: Spatial variations in the microstructure of dentine contribute to its mechanical behaviour. OBJECTIVE: The objective of this investigation was to compare the microstructure and fatigue behaviour of dentine from donors of two different countries. METHODS: Caries-free third molars were obtained from dental practices in Colombia, South America and the US to assemble two age-matched samples. The microstructure of the coronal dentine was evaluated at three characteristic depths (i.e. deep, middle and superficial dentine) using scanning electron microscopy and image processing techniques. The mechanical behaviour of dentine in these three regions was evaluated by the fatigue crack growth resistance. Cyclic crack growth was achieved in-plane with the dentine tubules and the fatigue crack growth behaviour was characterized in terms of the stress intensity threshold and the Paris Law parameters. RESULTS: There was no difference in the tubule density between the dentine of patients from the two countries. However, there were significant differences (p≤0.05) in the tubule lumen diameters between the two groups in the deep and peripheral regions. In regards to the fatigue resistance, there was a significant increase (p≤0.05) in threshold stress intensity range, and a significant decrease in fatigue crack growth coefficient with increasing distance from the pulp in teeth from the US donors. In contrast, these properties were independent of location for the dentine of teeth from the Colombian donors. CONCLUSIONS: The microstructure of dentine and its mechanical behaviour appear to be a function of patient background, which may include environmental factors and/or ethnicity.

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A Síndrome do Dente Trincado (SDT) caracteriza-se por uma fratura incompleta do esmalte que pode se estender até a dentina com ou sem comprometimento pulpar. Geralmente não é detectada a olho nu ou através de imagens radiográficas, o que torna o seu diagnóstico difícil para o cirirgião dentista...

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Sugere-se nesta oportunidade, uma técnica de tratamento de dentes fraturados, utilizando-se protocolo de adesão dentinária, compósitos e coroa protética, unindo e contendo os fragmentos fraturados. São apresentados quatro casos com acompanhamento por até 20 anos após o tratamento, demonstrando a efetividade terapêutica longitudinal

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El dolor orofacial (DOF) es un problema común en el población y representa una condición potencialmente deteriorante y debilitante. Un diagnóstico correcto es la base principal para un manejo adecuado; en pacientes con DOF esta tarea puede ser pequeña y simple, o bien convertirse en una experiencia complicada y frustrante para ambos, clínico y pacinetes. Sin embargo, el conocimiento por parte del clínico de todas las posibles condiciones de dolor que pueden afectar la región orofacial facilitará el proceso diagnóstico. Es importante destacar que es muuy difícil diagnosticar algo que no se conoce y aunque "las cosas comunes ocurren comúnmente" no es extraño encontrar pacientes con patologías "raras", de poca ocurrencia, que el clínico ha olvidado o no conoce. El hecho de que el clínico no considere todos estos aspectos durante la evaluación clínica puede llevarlo fácilmente a confundirse, lo que finalmente terminará en un diagnóstico incorrecto, mal manejo clínico y posiblemente consecuencias devastadoras para los pacientes. Esta es una serie de tres artículos que tienen como propósito presentar una revisión de la literatura de las condiciones que se han considerado para establecer el diagnóstico diferencial del dolor orofacial. Los dolores asociados a las estructuras intracraneales (cefaleas por tumores cerebrales), extracraneales (dientes, ojos, senos paranasales, entre otros) y el dolor sicogénico serán discutidos en este primer artículo

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Conocer los efectos nocivos de las radiaciones electromagnéticas o ionizantes sobre el organismo, en especial sobre las alteraciones que se producen en los tejidos dentarios, tanto en su desarrollo como en la erupción, en pacientes sometidos a radio terapia.

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A síndrome do dente trincado ocorre com grande freqüência. Seu tratamento pode ser complexo e seu diagnóstico é difícil. Em exame radiográfico raramente a presença de fratura pode ser observada. Vários outros termos têm sido usados como sinônimos, como fratura incompleta e fratura de esmalte. Geralmente a presença de dor tem sido usado como indicativo da fratura. Muitos fatores contribuem para fratura incompleta de um dente como a mal oclusão, os grandes preparos cavitários e o traumatismo oclusal. Existem diversas formas de tratamento sugeridas na literatura como, por exemplo: o ajuste oclusal localizado, a restauração adesiva em compósitos e em amálgama, o uso de bandas ortodônticas, os onlays, e os adesivos

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