Radiolucência intracoronal pré-eruptiva (PECR) de um segundo molar permanente. relato de caso / Pre-eruptive intracoronal radiolucency (PECR) of a permanent second molar. case report

Introdução: A Radiolucência intracoronal pré eruptiva (PECR) é um achado radiográfico, com aspecto de lesão radiolúcida na dentina coronária, adjacente a junção amelodentinária, em dentes não irrompidos. Objetivo: Relatar um caso de possível reabsorção intracoronal pré-eruptiva com destruição extensa de dentina e envolvimento pulpar de um segundo molar permanente recém-erupcionado. Método: Após definição do diagnóstico, optou-se por um tratamento conservador, com a realização de capeamento pulpar direto com a finalidade de manutenção da vitalidade pulpar e término de formação das raízes. Resultado: Após o tratamento, paciente permaneceu assintomática no controle de quinze dias, com teste de vitalidade normal e sem sinais de inflamação. Conclusão: A interpretação cuidadosa do exame radiográfico é crucial para a detecção precoce e manejo adequado dessas lesões.

Pre-eruptive intracoronal radiolucency (PECR) is a radiographic finding, with the appearance of a radiolucent lesion in the coronary dentin, adjacent to the dentinal-enamel junction, in unerupted teeth. Objective: To report a case of possible pre-eruptive intracoronal resorption with extensive dentin destruction and pulpal involvement of a newly erupted second permanent molar. Method: After defining the diagnosis, a conservative treatment was chosen, with direct pulp capping in order to maintain pulp vitality and end root formation. Result: After treatment, the patient remained asymptomatic in the fifteen-day control, with normal vitality test and no signs of inflammation. Conclusion: Careful interpretation of the radiographic examination is crucial for early detection and proper management of these lesions.

Avaliação dos ruídos da articulação temporomandibular em crianças com bruxismo / Assessment of temporomandibular joint sounds in children with bruxism

OBJETIVO: avaliar se há relação entre bruxismo e presença de ruídos articulares em crianças. MÉTODOS: participaram do estudo 48 crianças entre 6 e 9 anos atendidas na Clínica Infantil da Faculdade de Odontologia da Universidade Nove de Julho. Foram selecionadas 21 crianças com bruxismo e 27 crianças no grupo controle. Um único examinador previamente treinado e "cego" em relação aos grupos realizou exame de palpação manual e auscultação bilateral das Articulações Temporomandibulares com a utilização de estetoscópio, extra-auricular lateral e dorsal para a análise dos ruídos articulares, diferenciando-os em crepitação e estalidos. Foi realizado o número mínimo de 3 repetições nas mensurações dos ruídos para cada criança. Foram realizadas as análises descritivas de todas as variáveis e o teste qui-quadrado foi utilizado para avaliar a associação entre as variáveis, adotando-se um nível de significância de 5%. RESULTADOS: em relação à presença de ruído 37,5% (n=18) apresentaram algum tipo de ruído articular, sendo que 72,2% (n=13) apresentaram estalido e 27,8% (n=5) apresentaram crepitação. Das 18 crianças que apresentaram algum tipo de ruído, 66,7% (n=12) também eram bruxistas. Foi observada associação estatisticamente significante entre a presença de ruído e bruxismo. Ao analisar a associação entre ruído e as variáveis gênero e idade, o grupo estudado não houve associação entre ruído e gênero, porém em relação à idade, houve uma maior porcentagem de crianças sem a presença de ruído articular aos 6 anos de idade, sendo estatisticamente significante. CONCLUSÃO: os dados do presente estudo mostraram associação entre bruxismo e ruídos articulares em crianças. .

PURPOSE: the aim of the present study was to determine whether bruxism is associated with joint sounds in children. METHODS: children aged six to nine years were recruited from the pediatric clinic of the School of Dentistry of University Nove de Julho (Brazil). Twenty-one children with bruxism and 27 children without this condition (control group) were selected. The evaluation was performed by a previously trained examiner who was blinded to the allocation of the groups and involved manual palpation as well as lateral and dorsal extra-auricular auscultation of the temporomandibular joints with the aid of a stethoscope for the determination of joint sounds, differentiating a click/pop from crepitus. At least three readings were performed on each child. Descriptive statistics were conducted and the chi-square test was used to test associations among the variables, with the level of significance set to 5% (p < 0.05). RESULTS: a total of 37.5% (n = 18) of the sample exhibited some type of joint sound. Among these children, 72.2% (n = 13) exhibited a click/pop and 27.8% (n = 5) exhibited crepitus. Among the 18 children with joint sounds, 66.7% (n = 12) also had bruxism. A statistically significant association was found between joint sounds and bruxism. No association was found between joints sounds and sex. However, a significant association was found with regard to age, as a greater percentage of children at six years of age had no joint sounds. CONCLUSION: the present findings demonstrate an association between bruxism and joint sounds in children. .

Association between respiratory problems and dental caries in children with bruxism.

Context: Bruxism is the habit of clenching or grinding one's teeth in non-functional activities and affects both children and adults alike. Respiratory problems, such as asthma and upper airway infections, are reported to be the etiological factors of bruxism. Aims: The aim of the present study was to determine whether there is an association between respiratory problems and dental caries in children who exhibit the habit of bruxism. Setting and Design: An observational cross-sectional study was carried out. Materials and Methods: Patient histories were taken and clinical exams were performed on 90 children for selection and allocation to one of two groups. For the determination of bruxism, a questionnaire was administered to parents/guardians and an oral clinical exam was performed based on the criteria of the American Academy of Sleep Medicine. Thirty-three male and female children between 4 and 7 years of age participated in the study - 14 children with bruxism and 19 children without bruxism. Statistical Analysis: The data were statistically analyzed using the chi-square test, with level of significance set at 5% (P < 0.05). Results: Mean age of the participants was 5.73 years. The male gender accounted for 45.5% (n = 15) of the sample and the female gender accounted for 54.5% (n = 18). A statistically significant association was found between respiratory problems and dental caries among the children with bruxism. Seventy-seven percent of the children with bruxism had caries and 62.5% the children with respiratory problems exhibited the habit of bruxism. Conclusions: There seems to be an association between bruxism, respiratory problems, and dental caries in children.

Influence of acid etching on shear strength of different glass ionomer cements

Aim: To assess the influence of dental etching on the shear strength of different glass ionomer cements. Methods: The crown of 60 bovine incisors was prepared to obtain a flat, smooth surface, were attached to a PVC tube and randomly divided into six groups: Group 1 – Riva Self Cure without etching; Group II – Riva Self Cure with pre-etching; Group III – Maxxion R without etching; Group IV – Maxxion R with pre-etching; Group V – Ketac™Molar Easymix without etching; and Group VI – Ketac™Molar Easymix with pre-etching. Etching was performed with 10% polyacrylic acid for 30 s. A standardizing device was used for preparation of the test specimens (SBS Test Method). Following preparation, the specimens were stored in distilled water at 37º Cfor 24 h. The shear test was performed on a Kratos universal testing machine at a crosshead speed of 0.5 mm/min. The specimens were then viewed under a stereomicroscope at a magnification of x90 for analysis of fractures. Results: The results revealed that pre-etching increased the shear strength of Riva glass ionomer cement (SDI) alone, where as no statistically significant differences were found with regard to the other materials tested. Conclusions: Pre-etching with 10% polyacrylic acid for 30 s increased the shear strength of Riva glass ionomer cement.

Atividade antimicrobiana de um novo biomaterial utilizado na remoção químico-mecânica da cárie / Antimicrobial activity of a new biomaterial used for chemomechanical caries removal

O objetivo deste trabalho foi avaliar, in vitro, a capacidade antimicrobiana doPapacárie®, para Streptococcus mutans e Lactobacillus acidophilus, por meio da técnica de difusão em agar. Trezentos microlitros de Streptococcus mutans foram inseridos em 15 mL de meio decultura BHI-ágar e dispensados em seis placas de Petri. O mesmo procedimento foi realizado para Lactobacillus acidophilus. Após endurecimento do meio, foram confeccionados seis poços por placa, sendo o material experimental inserido alternadamente com gel de gluconato de clorexidinaa 1% (controle positivo). As placas foram mantidas à temperatura ambiente por duas horas para pré-difusão do material e posteriormente incubadas a 37°C por 24 horas em microaerofilia. Após esse período, o halo de inibição formado ao redor do poço foi medido com o auxílio de paquímetrodigital. A análise dos dados obtidos revelou que o Papacárie® não apresentou propriedades antimicrobianas para Streptococcus mutans e Lactobacillus acidophilus.

The aim of this in vitro study was to evaluate the antimicrobial potential of Papacárie®, for Streptococcus mutans and Lactobacillus acidophilus, with the agar diffusiontest. Three hundred microliters of Streptococcus mutans were introduced in 15 mL of BHI-ágarculture media and transferred to six Petri plates. The same procedure was done for Lactobacillus acidophilus. After the culture media set, six wells per plate were done and the experimental material was inserted alternately with 1% gluconate chlorhexidine gel (positive control). The plates were maintained at room temperature during two hours for pre-diffusion of the material, and then incubated at 37°C for 24 hours in candle jars. After this period, the inhibition halo formed around the wells was measured with a digital calipter. The data analysis revealed that Papacárie® did not present antimicrobial properties for Streptococcus mutans and Lactobacillus acidophilus.

Eficiência do Papacárie® na remoção químico-mecânico de dentina cariada / Papacarie® efficiency on chemo-mechanical removal of caries dentin

O objetivo deste trabalho foi avaliar a eficiência do Papacárie® na remoção químico-mecânica do tecido cariado. Foram utilizados dez terceiros molares humanos com a superfície dentinária artificialmente cariada. Os espécimes foram divididos em dois grupos: no primeiro, a dentina cariada foi removida utilizando-se o Papacárie®; e, no segundo, a fresa em baixa rotação. O tempo de trabalho foi cronometrado, obtendo-se uma média de 22 segundos para fresa em baixa rotação e de 119,9 segundos para o Papacárie®. Concluindo-se que a remoção químico-mecânica requereu um maior tempo para remoção de dentina cariada.