Microabrasion effect on enamel susceptibility to penetration of hydrogen peroxide: an experimental and computational study.

To evaluate in vitro transenamel/transdentinal of penetration of H2O2 after microabrasive. Computational models were performed to verify peroxide penetration and evaluate if geometric modifications could affect in vitro results. Enamel/dentin blocks from bovine incisors were prepared and randomly divided into groups (n = 15) according with abrasive (35% phosphoric acid and pumice or 6.6% hydrochloric acid and silica) and bleaching agents (16% carbamide peroxide and 35% H2O2). From artificial pulp chambers, the H2O2 concentration was measured and SEM was used for surface morphology. Numerical models were performed (Abaqus® v6.12) modifying slightly enamel/dentin thickness based on experimental data. All groups presented H2O2 penetration, although no significant difference was noted between the control and experimental groups (p > 0.05). The numerical analysis demonstrated the role of dental tissue thickness in the H2O2 penetration. Microabrasion is recommended as its association with bleaching procedures and small modifications in thicknesses of enamel/dentin can cause substantial changes in HP penetration. Such diffusion aspect is clinically relevant for the bleaching procedures since very thin enamel could present more peroxide propagation through dental tissues.

Prevalence of self-reported versus diagnosed dentinal hypersensitivity: a cross-sectional study and ROC curve analysis.

OBJECTIVE: This study aimed to identify and compare the self-reported and diagnosed prevalence of dentinal hypersensitivity (DH) in an University population; and to verify accuracy, sensitivity and specificity of DH stimuli tests. MATERIAL AND METHODS: Three hundred and eighty patients (67.2% women and 32.8% men) were assessed by questionnaire, clinical exam, tactile and cold water tests. The intensity of DH was assessed using a visual analogue scale, and a calibrated examiner measured the scores using a caliper. The ICC for intra-examiner was 0.990. Scores above 5 mm were considered sensitive teeth. The association between variables was assessed by Chi-square test. ROC curve analysis determined accuracy, sensitivity and specificity of the tests (p < .05). RESULTS: The mean age of participants was 24.08 years. 158 (41.7%) volunteers self-reported the presence of DH, while, 88.7% of the participants were clinically diagnosed (p = .023). In total, 8958 teeth were evaluated, of those 3367 (37.6%) were diagnosed sensitive. The most prevalent teeth with DH were incisors and premolars. The accuracy of the tests with cold water and tactile were 99%. The sensitivity and specificity for cold water and tactile tests were 99.9%, 99.7%, 99.1% and 87.6%, respectively. CONCLUSION: The self-reported prevalence of DH was significantly lower than that clinically diagnosed. The cold test proved to be a highly accurate stimulus for the diagnosis of DH.

Associated factors to cervical dentin hypersensitivity in adults: a transversal study.

BACKGROUND: This cross-sectional study aimed to identify the factors associated to the cervical dentin hypersensitivity (DH) in Brazilian adult population. METHODS: Three hundred and eighty patients (67.2% women and 32.8% men) were assessed by questionnaire and thermal test with ice. Participants marked in a visual analogue scale (VAS) the intensity of pain, and a calibrated examiner (ICC 0.990) measured the scores using a caliper. Pain scores above 0.5 mm were considered sensitive teeth. The DH associated factors were investigated by clinical examination. The association between variables was assessed by Spearman correlation and the Chi-square test. Logistic regression was used to determine the variables that predict DH (p < 0.05). RESULTS: The mean age of participants was 24.08 years. In this population, 8958 teeth were evaluated, of those 3037 (33.9%) were diagnosed sensitive. The most prevalent associated factors to DH were abnormal tooth positioning (9.0%), occlusal trauma (6.5%) and gingival recession (5.6%). The erosion predicted significantly the DH on both simple (OR 7.85, p < 0.001) and multiple(OR 4.36, p < 0.001) analysis. CONCLUSION: The exposure of dentinal tubules by erosion is probably the major predictor of dentin hypersensitivity. The healthy tooth is able to protect against DH.

Hipersensibilidade dentinária cervical autorrelatada e diagnosticada: um estudo piloto / Dentin hypersensitivity self-reported and diagnosed: a pilot study

Este estudo-piloto teve como principal objetivo identificar e comparar a prevalência autorrelatada e diagnosticada de hipersensibilidade dentinária cervical (HSDC) na população da Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Diamantina/MG. Foram também verificados os fatores etiológicos associados e a distribuição dos dentes sensíveis nos arcos. Foram avaliados 54 pacientes, escolhidos aleatoriamente através de questionário, ficha clínica e exame clínico dividido em dois testes. No teste evaporativo, cada dente foi testado com o jato de ar da seringa tríplice, e o teste térmico foi realizado com spray de tetrafluoretano (Endo-Ice); em ambos os testes, adotou-se o tempo de cinco segundos para a execução dos mesmos. A dor foi avaliada por dois examinadores calibrados, através de uma escala analógica visual (EAV). Os participantes que apresentavam pelo menos um dente com escore igual ou maior do que 2,51 no teste evaporativo foram considerados como apresentando HSDC. Dos pacientes que relataram a presença de hipersensibilidade, 76,3% (n=18) tiveram confirmado o diagnóstico clínico, ao passo que, dos que disseram não apresentar HSDC, 23,7% (n=3) foram diagnosticados clinicamente com a condição. A faixa etária dos participantes variou de 18 a 45 anos. Os dentes mais acometidos foram, respectivamente, os incisivos inferiores e os superiores. Quanto aos fatores etiológicos, os de maior prevalência foram: a retração gengival e o posicionamento inadequado dos dentes. Concluiu-se que a prevalência autorrelatada é significativamente maior do que a prevalência diagnosticada clinicamente, e os fatores etiológicos mais comuns na amostra analisada foram: recessão gengival e posicionamento inadequado dos dentes.

This pilot study aimed to identify and to compare the self-reported prevalence of diagnosed and cervical dentin hypersensitivity (CDH) in the population of the Federal University of the Jequitinhonha and Mucuri (UFVJM), Diamantina. It were checked the associated etiological factors and the distribution of sensitive teeth in the arches. 54 patients randomly chosen via questionnaire, medical records and clinical examination divided into two tests were evaluated. In evaporative test; each tooth was tested with the air blast of the triple syringe; and thermal testing was done with spray tetrafluoroethane (Endo-Ice); in both tests we used a time of 5 seconds for the execution. Pain was evaluated by two calibrated examiners using a Visual Analogue Scale (VAS). Participants who had at least one tooth with a score equal to or greater than 2.51 in evaporative test were considered as presenting CDH. Of the patients who reported the presence of hypersensitivity, 76.3% (n=18) had confirmed the clinical diagnosis, while those who do not present said CDH, 23.7% (n=3) were clinically diagnosed with the condition. The age of participants ranged from 18 to 45 years. The most affected teeth were respectively the lower and upper incisors. As etiologic factors, the most prevalent were the gingival retraction and improper positioning of the teeth. It was concluded that self-reported prevalence is significantly higher than the prevalence diagnosed clinically and that gingival recession and mal apposition of teeth were the most common etiologic factors in the sample.