A 12-month Follow-Up Study of Pulp Oxygen Saturation in Deciduous Molars After Selective and Nonselective Carious-Tissue Removal: A Randomized Pilot Trial

Objective: To compare the pulp vitality of deciduous molars before and after selective caries removal (SCR) or nonselective caries removal to hard dentin (NSCR) over one year, using oxygen saturation percentage (%SaO2). Material and Methods: Deciduous molars with deep occlusal/proximal-occlusal caries lesions were randomized to SCR (n=22) or NSCR groups (n=22). After the caries removal, the teeth were protected with calcium hydroxide cement and restored with composite resin (Filtek Z250). The pulp condition diagnosis was evaluated at baseline, immediately after caries removal, and follow-up (7 days, 1-, 6- and 12-months) by %SaO2. Pulp exposure and pulp necrosis were primary outcomes, and %SaO2 was secondary. Results: Intraoperative pulp exposure occurred in four teeth of the NSCR group (18.2%) and one tooth of the SCR group (4.5%) (p>0.05). Two cases of pulp necrosis occurred in the NSCR group (10%). No difference in %SaO2 pulp was observed in the inter-and intragroup comparison over time (p>0.05). Conclusion: Advantageously, the %SaO2 minimizes preoperatory pulp vitality diagnosis subjectivity before SCR/ NSCR treatments. Furthermore, the pilot study results suggest the pulp response of deciduous molars, when evaluated by clinical, radiographic, and pulp %SaO2 seems not to differ between teeth treated with SCR or NSCR

A 12-month Follow-Up Study of Pulp Oxygen Saturation in Deciduous Molars After Selective and Nonselective Carious-Tissue Removal: A Randomized Pilot Trial

Objective: To compare the pulp vitality of deciduous molars before and after selective caries removal (SCR) or nonselective caries removal to hard dentin (NSCR) over one year, using oxygen saturation percentage (%SaO2). Material and Methods: Deciduous molars with deep occlusal/proximal-occlusal caries lesions were randomized to SCR (n=22) or NSCR groups (n=22). After the caries removal, the teeth were protected with calcium hydroxide cement and restored with composite resin (Filtek Z250). The pulp condition diagnosis was evaluated at baseline, immediately after caries removal, and follow-up (7 days, 1-, 6- and 12-months) by %SaO2. Pulp exposure and pulp necrosis were primary outcomes, and %SaO2 was secondary. Results: Intraoperative pulp exposure occurred in four teeth of the NSCR group (18.2%) and one tooth of the SCR group (4.5%) (p>0.05). Two cases of pulp necrosis occurred in the NSCR group (10%). No difference in %SaO2 pulp was observed in the inter-and intragroup comparison over time (p>0.05). Conclusion: Advantageously, the %SaO2 minimizes preoperatory pulp vitality diagnosis subjectivity before SCR/ NSCR treatments. Furthermore, the pilot study results suggest the pulp response of deciduous molars, when evaluated by clinical, radiographic, and pulp %SaO2 seems not to differ between teeth treated with SCR or NSCR

PROPRIEDADES MECÂNICAS DE MATERIAIS RESINOSOS UTILIZADOS PARA RESTAURAÇÕES DE LESÕES CERVICAIS / MECHANICAL PROPERTIES OF RESIN MATERIALS USED IN CERVICAL LESIONS RESTORATIONS

Introdução: Desordens oclusais complexas podem ocasionar a fratura de tecido dentário e o aparecimento de hipersensibilidade dentinária, levando o profissional a difícil escolha do material restaurador. Objetivo: Comparar as propriedades mecânicas (resistência flexural e módulo de elasticidade) de cinco materiais utilizados para restauração de lesões cervicais com a dentina bovina. Métodos: Foram utilizadas duas resinas compostas comerciais de baixa viscosidade: Opallis Flow (OL) e Natural Flow (NF); duas resinas composta comerciais de viscosidade média: Z-100 (Z100) e Opallis (OP); e um cimento de ionômero de vidro modificado por resina Riva Light Cure (RL). Para a confecção dos corpos-de-prova, o material foi inserido uma matriz de silicone e fotoativado (n=12). Para a confecção dos corpos-de-prova de dentina, raízes de dentes bovinos foram utilizadas. As raízes foram seccionadas em uma máquina de corte (Isomet 1000) e lixados para obtenção dos palitos de dentina (10x1x1mm). Após, os corpos-de-prova foram levados a uma máquina de ensaio universal (Instron 3342) sob uma velocidade de 0,5 mm/min para o ensaio de resistência flexural e módulo de elasticidade. Os dados foram submetidos ANOVA um fator e Tukey (α=0.05). Resultados: Houve diferença significativa entre os grupos experimentais testados (p<0,05). A dentina bovina apresentou valores superiores de resistência flexural (169,30 ± 19,60 MPa) e os menores valores de módulo de elasticidade (4,48 ± 0,32 GPa). Conclusão: Nenhum material utilizado na pesquisa apresenta características mecânicas próximas daquelas encontradas na dentina bovina.Palavras-chave: Módulo de Elasticidade. Materiais Dentários. Dentina.AbstractIntroduction: Complex occlusal disorders can lead to tissue tooth fracture and may cause dentin hypersensitivity, thus dental professional have difficult to choose the ideal restorative material Objective: To compare flexural strength and modulus of elasticity, of five materials used for restoration of cervical lesions with bovine dentin. Methods: Two low viscosity resins: Opallis Flow (OL) and Natural Flow (NF), two medium viscosity resins: Z-100 (Z100) and Opallis (OP), and ionomer resin modified glass Riva Light Cure (RL) were tested materials. The specimens were made by silicon matrix and halogen light curing unit (Optilux 501) (n = 12). For dentin specimens, twelve bovine teeth without coronal portion were used. The roots were cut using a cutting machine (Isomet 1000) to obtain dentin sticks (10x1x1mm). Flexural strength test was conducted on a universal testing machine (Instron 3342) at a crosshead speed of 0.5 mm/min. Data were submmited to ANOVA (one variation factor) and Tukey (α=0.05). Results: There were significant differences between experimental groups tested (p < 0.05). Bovine dentin showed higher flexural strength values, which were statistically significant (169.30 ± 19.60 MPa). Bovine dentin showed lower modulus values (4.48 ± 0.32 GPa). Conclusion: No material used in this study showed similar mechanical properties from those found in bovine dentin.Keywords: Elastic Modulus. Dental Materials. Dentin

Oral manifestations of renal tubular acidosis associated with secondary rickets: case report

ABSTRACT This report describes the oral manifestations of renal tubular acidosis (RTA) associated with secondary rickets and discusses the biological plausibility of these findings. The characteristic electrolyte changes during RTA or genetic mutations that trigger RTA may be responsible for impaired amelogenesis, dental malocclusion, impacted teeth, and absent lamina dura. This report reinforces the possibility of an association between RTA and the oral manifestations described

Is sickle cell anemia a risk factor for severe dental malocclusion?

The aim of this study was to investigate possible associations between sickle cell anemia (SCA) and the severity of dental malocclusion (MO). This was a retrospective cohort study of 93 individuals with SCA (G1) and 186 individuals without the disease (G2). SCA patients were randomly selected by a simple draw from patients treated in the Centro de Hematologia e Hemoterapia do Maranhão (HEMOMAR) in northeastern Brazil. Patients aged between 16 and 60 were included after being tested for the hemoglobin S gene. G2 consisted of individuals living in the same residence as the patients. The Dental Aesthetic Index (DAI), as well as some morphological deviations not included in DAI, were used for the orthodontic evaluation of MO. Poisson regression with robust variance adjustment was employed to estimate relative risk (RR). In the multivariate analysis, SCA was associated with moderate (RR = 1.36) and very severe MO (RR = 8.0). SCA is correlated with anterior tooth loss (RR = 1.94), anterior spacing (RR = 1.66), overjet (RR = 1.87), anterior crossbite (RR = 1.94), and open bite (RR = 1.94). Thus, SCA is a risk factor for moderate and very severe MO

Oral rehabilitation after treatment of does sickle cell crises and comorbidities increase the risk of pulp necrosis in healthy teeth?

Objetivo: Avaliar a associação entre número de Crises Falcêmicas ao ano (No CFs/ano) e a presença de Co-Morbidades (CoM) com a Necrose Pulpar Assintomática (NPA) em dentes com coroa hígida de indivíduos com Anemia Falciforme (AF). Material e Métodos: Trata-se de um estudo transversal aninhado a uma coorte retrospectiva (protocolo do Comitê de Ética e Pesquisa local n° 23115 004993/ 2010-71). A amostra (n=140) foi constituída por indivíduos com AF maiores de 16 anos e com pelo menos um dente hígido, sem histórico de parestesia do nervo alveolar inferior nos últimos seis meses, sem história prévia de traumatismo dentário ou doença periodontal. O diagnóstico da NPA foi realizado por meio da oximetria de pulso adaptada à Odontologia, considerando a porcentagem de saturação de oxigênio arterial pulpar ? 79%. Resultados: Dos 140 indivíduos avaliados, 125 indivíduos sem NPA e 15 com NPA. Foram testados dois modelos: 1) com desfecho dicotômico – ter NPA e 2) porcentagem de dentes com NPA; através da Modelagem de Equações Estruturais (?=0.05). Não houve associação entre Nº CFs/ano com os dois desfechos NPA considerados. A presença CoM explicou a presença de NPA (CFP>0,999; p=0,032). Conclusão: Concluiu-se a presença de CoM em pacientes falcêmicos aumenta o risco de NPA em dentes hígidos.Objective: to evaluate the extent to which the number of sickle-cell crises per year (SCCs/year) and the presence of comorbidities (CoMs) are associated with asymptomatic pulp necrosis (APN) in teeth with healthy crowns among patients with sickle cell anemia (SCA). Material and Methods: this is a cross-sectional study nested within a retrospective cohort study (local Research Ethics Committee Protocol No. 23115 004993/2010-71). The sample (n = 140) consisted of patients with SCA who were aged ?16 years, possessed at least one healthy tooth, had no history of inferior alveolar nerve paresthesia within the previous 6 months, and had no previous history of dental trauma or periodontal disease. The diagnostic test for APN was performed using pulse oximetry adapted to dentistry, in which the percentage of arterial oxygen saturation of the pulp was set at ?79%. Results: among the 140 patients evaluated, 15 had APN and 125 did not. Two models were tested: one with a dichotomous outcome (having APN or not) and another based on the percentage of teeth with APN; structural equation modeling was used (? = 0.05). There was no association between the number of SCCs/year and the two APN outcomes considered herein. The presence of CoMs explained the presence of APN (SFL > 0.999; p = 0.032). Conclusion: the presence of CoMs in patients with SCA increases the risk of APN in otherwise healthy teeth