Functional-aesthetic treatment of crown fracture in anterior teeth with severe crowding

Introduction: Traumatic injuries are usually the result of impacts whose aggressive strength exceeds the resistance found in bone, muscle and tooth tissues. With the advent of the etching technique and considering the improvement of composite resins, simpler and more conservative alternatives are indicated in the aesthetic and functional rehabilitation of fractured anterior teeth. Report and Objective: This study aimed to report the treatment of a 13 year-old patient that fractured his central incisor due to a trauma. After clinical and radiographic examination, an oblique crown fracture with extensive involvement of the incisal angle, without pulp exposure or injury to the biological space of the left maxillary central incisor (tooth #21) was observed. Because the fractured tooth fragment was lost, it was not possible to process a fragment bonding. Thus, it was proposed to treat the tooth through direct technique restoration with composite resin. Conclusion: It can be concluded that the aesthetic and functional rehabilitation with direct composite resin is a viable option for the conservative treatment of fractured anterior teeth.

Effect of light-activation with different light-curing units and time intervals on resin cement bond strength to intraradicular dentin

The aim of this study was to assess the bond strength of a resin cement to intraradicular dentin varying the light-curing unit and the moment at which the light was applied. Post spaces of endodontically treated canines were prepared. The roots were distributed into 6 groups (n=10) according to the light-curing unit and the moment of light exposure: I) Quartz tungsten halogen-600 mW/cm² (QTH) + immediate light activation (t0); II) QTH + light activation after 10 min (t10); III) Light-emitting diodes (LED)-800 mW/cm² (LED-800)+ t0; IV) LED-800 + t10; V) LED-1,500 mW/cm² (LED-1500)+ t0; VI) LED-1500 + t10. After post cementation, slices from coronal, middle and apical post/root regions were submitted to the push-out test and failure evaluation. It was verified that LED-800 (4.40 ± 3.00 MPa) and LED-1500 (4.67 ± 3.04 MPa) provided bond strength statistically superior to QTH (3.13 ± 1.76 MPa) (p<0.05), and did not differ from each other (p>0.05). There was no significant difference between t0 and t10 (p>0.05). Coronal post/root region (4.75 ± 3.10 MPa) presented significantly higher bond strength than the apical (3.32 ± 2.30 MPa) (p<0.05) and middle regions (4.14 ± 2.99 MPa) showed intermediate values. Adhesive failures were predominant when using QTH. Adhesive and mixed failures occurred more frequently in the apical region. Higher adhesion of the resin cement to intraradicular dentin was observed in the coronal region with LED light-activation, regardless of the moment of light exposure.

O objetivo deste estudo foi avaliar a resistência de união do cimento resinoso à dentina intrarradicular em função da fonte fotoativadora e do momento de aplicação da luz. Os espaços para cimentação dos pinos foram preparados em caninos tratados endodonticamente. As raízes foram distribuídas em seis grupos (n = 10) de acordo com a fonte fotoativadora e momento de exposição à luz: I) Luz halógena (LH) com densidade de potência 600 mW/cm² + fotoativação imediata (t0); II) LH + fotoativação após 10 min (t10); III) LED com densidade de potência 800 mW/cm² (LED-800)+ t0; IV) LED-800 + t10; V) LED com densidade de potência 1.500 mW/cm² (LED-1500)+ t0; VI) LED-1500 + t10. Após a cimentação dos pinos, slicesdas regiões cervical, média e apical foram submetidos ao teste de push-out e avaliação das falhas. Verificou-se que LED-800 (4,40 ± 3,00 MPa) e LED-1500 (4,67 ± 3,04 MPa) proporcionaram resistência de união estatisticamente superior à LH (3,13 ± 1,76 MPa) (p<0,05), e não diferiram entre si (p>0,05).Não houve diferença estatisticamente significante da resistência de união entre t0 e t10 (p>0,05). A região cervical (4,75 ± 3,10 MPa) apresentou maiores valores de resistência de união que a apical (3,32 ± 2,30 MPa) (p<0,05) e a região média (4,14 ± 2,60 MPa) mostrou valores intermediários. Falhas adesivas foram predominantes no grupo LH, independentemente da região pino/canal. A parte apical apresentou predomínio de falhas adesivas e mistas. Concluiu-se que a resistência de união do cimento resinoso à dentina intrarradicular foi maior no terço cervical,com fotoativação com LED, independente do momentode exposição à luz.

Conhecimento e fatores de risco do câncer de boca em um programa de prevenção para motoristas de caminhão / Knowledge and risk factors of oral cancer in a prevention program for truck drivers

O objetivo deste estudo foi identificar, entre motoristas de caminhão, os conhecimentos em relação ao câncer de boca, seus fatores de risco, as lesões cancerizáveis e o tratamento dessa doença. O estudo foi realizado por meio de questionário em 776 pessoas que participaram de uma campanha de saúde realizada no estado de São Paulo, em 2009. O questionário com 17 questões procurou caracterizar a população de estudo em relação ao conhecimento, aos hábitos e às atitudes, como: fatores etiológicos; sinais e sintomas; prevenção; autoexame; visitas ao cirurgião-dentista. Os resultados mostraram que a idade média dos participantes foi de 42 anos (dp±10,1) e com baixa escolaridade (63,1% apenas com o ensino fundamental). A maioria (64,6%) não havia recebido nenhuma orientação sobre o câncer de boca, e apenas 32,1% souberam citar algumas das prováveis causas da doença. Os sinais suspeitos da doença foram relatados por 27,6% das pessoas, e apenas 15,9% responderam conhecer o autoexame da boca. Diante dos resultados apresentados, pode-se concluir que é importante a realização de campanhas educativas que visem à prevenção e ao diagnóstico precoce do câncer de boca, pois a desinformação mostrou-se elevada.

The purpose of this study was to evaluate the knowledge of driver truck about oral cancer, its risk factors, injuries and treatment of disease. The study was conducted by questionnaire with 776 people who participated in a health campaign in the state of Sao Paulo in 2009. The questionnaire had 17 questions, wich looked for to characterize the population of study in relation to the knowledge, the habits and the attitudes, as etiological factors, signs and symptoms, prevention, self-examination; visits to the dentist. The results showed that the mean age of participants was 42 years (± 10.1), with low education (63.1% with basic education). The majority (64.6%) had not received any guidance on oral cancer and only 32.1% had known to cite some of the probable causes of the disease. The suspect signs of disease were reported by 27.6% of the people and only 15.9% said knowing the mouth's self-examination. Results of this study suggested that it is important to carry out educational campaigns aimed at the prevention and early diagnosis of oral cancer, because the lack of information was high.