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OBJECTIVES: The objective of this study was to evaluate the influence of voxel size on artifacts arising from the exomass in cone beam computed tomography (CBCT). STUDY DESIGN: An imaging phantom was scanned using 2 CBCT units, each adjusted to 2 voxel sizes: 0.2 and 0.3 mm. From 1 to 3 metal inserts of titanium, cobalt-chromium, or amalgam were placed in the exomass and additional CBCT scans were acquired. Mean voxel gray values were obtained from 16 homogeneous areas of the phantom and averaged, and the standard deviation was calculated to obtain voxel gray value variability. The data were analyzed using 2-way analysis of variance, Tukey, and Dunnett tests (α =.05). RESULTS: Overall, mean voxel gray values and voxel gray value variability did not differ significantly between CBCT scans obtained with voxel sizes of 0.2 and 0.3 mm for either CBCT model tested (P > .05). Despite some exceptions in which significant differences were observed between the 2 voxel sizes (P < .05), the mean voxel gray values and voxel gray value variability resulting from different metal compositions and, in most situations, for different numbers of metal inserts in the exomass were not affected. CONCLUSION: Voxel size has little influence on exomass-related CBCT artifacts.
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Artefatos , Tomografia Computadorizada de Feixe Cônico , Humanos , Metais , Imagens de Fantasmas , CintilografiaRESUMO
This study evaluated the effect of 10% sodium hypochlorite (NaOCl) as deproteinizing agent and storage media on bond strength (BS) of two etch-and-rinse adhesive systems to dentin. Twenty-eight sound extracted human third molars were divided in four groups (n = 7), according to dentin treatment (conventional etching or etching followed by 10% NaOCl application) and adhesive systems (GB-Gluma 2Bond and OS-One-Step). After dentin treatments and adhesive application, a composite block was built-up on dentin surface and teeth were serially sectioned to obtain bonded sticks specimens. The sticks were submitted to three aging conditions: (24H) 24 hr in water (immediate), (SH) 3 hr of NaOCl accelerated-aging or (1Y) 1 year of water storage. Afterward, submitted to microtensile bond strength test (µTBS), failure modes and adhesive interfaces analyzes. Data were analyzed by two-way analysis of variance (ANOVA) and Tukey's test (α = .05). Dentin deproteinization before bonding significantly reduced µTBS for GB-treated group (p < .05), regardless the aging conditions. Water storage for 1 year (1Y) and NaOCl accelerated-aging (SH) decreased µTBS for both adhesives. Yet, the groups stored in NaOCl (SH) exhibited the lowest BS results (p < .05). Bond strength of deproteinized dentin was dependent on the adhesive system composition and NaOCl accelerated-aging promoted decreased bond strength and further degradation than water storage for 1 year.
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Adesivos/química , Dentina/química , Dente Serotino , Hipoclorito de Sódio/química , Colagem Dentária , Análise do Estresse Dentário , Humanos , Teste de Materiais , Resistência à Tração , ÁguaRESUMO
Abstract Objective: To investigate whether there is an association between sense of coherence levels and early weaning. Method: This study had a quantitative nature and a cross-sectional design. Factors associated with early weaning (interruption of maternal breastfeeding) were investigated in a sample of 425 women older than 18 years, mothers of children up to 36 months of age who were not twins, with no sensory or motor deficiencies, without distinction of ethnicity or social class. The chi-squared test, with a significance level of 5%, was used to evaluate the association between the dependent variable (early weaning) and the independent variables (socioeconomic, demographic factors and sense of coherence level). Variables with p ≤ 0.20 were tested by the multiple logistic regression model. Odds ratio and the respective 95% confidence intervals were estimated. All statistical tests were performed using the SAS 9.2 software. Results: The results showed that mothers with greater sense of coherence were 1.82 times more likely to maintain breastfeeding for longer periods (p = 0.02). Conclusions: The identification of mothers with low sense of coherence allows the early intervention of health professionals, contributing to decrease the rates of early weaning in the population.
Resumo Objetivo: Investigar se há associação entre níveis de senso de coerência e desmame precoce. Método: O presente estudo tem natureza quantitativa e delineamento transversal. Foram investigados fatores associados ao desmame precoce (interrupção da oferta do leite materno à criança) em uma amostra de 425 mulheres com idade superior a 18 anos, sem distinção de etnia ou classe social, mães de crianças com até 36 meses, que não fossem gêmeos ou apresentassem deficiências sensoriais ou motoras. Foi feito o teste de qui-quadrado, com nível de significância de 5%, para testar a associação entre a variável dependente (desmame precoce) e as variáveis independentes (socioeconômicas, demográficas e nível de senso de coerência). As variáveis que apresentaram p ≤ 0,20 foram testadas no modelo de regressão logística múltipla. Os odds ratio e os respectivos intervalos de 95% de confiança foram estimados. Todos os testes estatísticos foram feitos com o programa SAS 9.2. Resultados: Os resultados apontaram que mães com maior senso de coerência possuem 1,82 vez mais chance de manter o aleitamento por mais tempo (p = 0,02). Conclusões: A identificação de mães com baixo senso de coerência permite a intervenção precoce dos profissionais de saúde, contribui para diminuir as taxas de desmame precoce na população.
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Humanos , Feminino , Adulto , Desmame , Aleitamento Materno/psicologia , Senso de Coerência , Mães/psicologia , Fatores Socioeconômicos , Fatores de Tempo , Modelos Logísticos , Estudos Transversais , Inquéritos e Questionários , Fatores EtáriosRESUMO
OBJECTIVE: To investigate whether there is an association between sense of coherence levels and early weaning. METHOD: This study had a quantitative nature and a cross-sectional design. Factors associated with early weaning (interruption of maternal breastfeeding) were investigated in a sample of 425 women older than 18 years, mothers of children up to 36 months of age who were not twins, with no sensory or motor deficiencies, without distinction of ethnicity or social class. The chi-squared test, with a significance level of 5%, was used to evaluate the association between the dependent variable (early weaning) and the independent variables (socioeconomic, demographic factors and sense of coherence level). Variables with p≤0.20 were tested by the multiple logistic regression model. Odds ratio and the respective 95% confidence intervals were estimated. All statistical tests were performed using the SAS 9.2 software. RESULTS: The results showed that mothers with greater sense of coherence were 1.82 times more likely to maintain breastfeeding for longer periods (p=0.02). CONCLUSIONS: The identification of mothers with low sense of coherence allows the early intervention of health professionals, contributing to decrease the rates of early weaning in the population.
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Aleitamento Materno/psicologia , Mães/psicologia , Senso de Coerência , Desmame , Adulto , Fatores Etários , Estudos Transversais , Feminino , Humanos , Modelos Logísticos , Fatores Socioeconômicos , Inquéritos e Questionários , Fatores de TempoAssuntos
Radiografia , Radiologia , Humanos , Controle de Infecções , Radiologistas , Inquéritos e QuestionáriosRESUMO
OBJECTIVES: To create and validate a questionnaire to evaluate infection control in oral radiology. METHODS: The questionnaire was developed after review of the literature, which included published articles and the biosafety protocols available from healthcare agencies. The initial version of the questionnaire was composed of 14 multiple choice questions and was divided into 3 domains on handwashing, disinfection/protection of surfaces and disinfectant used. Content validity was assessed by two expert committees, which reviewed the content and scope of the questionnaire and the relevance of each item, respectively. Reliability was evaluated using test-retest and internal consistency methods with 115 undergraduate dentistry students. Construct validity was assessed using the known-groups technique and factor analysis. The known-groups technique involved 641 undergraduate dentistry students, 20 PhD students and 15 oral radiology professors. In the factor analysis, 3 radiology technicians also participated in addition to the 641 undergraduates, 20 PhD students and 15 oral radiology professors. RESULTS: The content validity results were found to be satisfactory to excellent for the ordinal variables (intraclass correlation coefficient = 0.722-1.000) and good to great for the yes/no questions (kappa = 0.662-0.913) in terms of reliability and good internal consistency (Cronbach's alpha = 0.88). After a factor analysis, some questions were excluded, and the questions were grouped into new domains. Significant differences were observed between answers from different groups. The final version of the questionnaire was composed of nine domains. CONCLUSIONS: The questionnaire created was found to exhibit good psychometric properties for assessing infection control in oral radiology.
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Controle de Infecções Dentárias/normas , Radiografia Dentária/normas , Inquéritos e Questionários , Humanos , Psicometria , Reprodutibilidade dos Testes , Precauções UniversaisRESUMO
INTRODUCTION: In this study, we aimed to assess the relationship between normative and perceived orthodontic treatment need associated with quality of life, self-esteem, and self-perception. METHODS: The sample included 248 schoolchildren aged 12 years. The normative aspect of orthodontic treatment was assessed by the Dental Health Component and the Aesthetic Component of the Index of Orthodontic Treatment Need. The subjects were further evaluated for their oral health-related quality of life, self-esteem, and self-perception of oral esthetics. The Aesthetic Component of the Index of Orthodontic Treatment Need was considered as the response variable, and generalized linear models estimated by the GENMOD procedure (release 9.3, 2010; SAS Institute, Cary, NC). Model 1 was estimated with only the intercept, providing the basis for evaluating the reduction in variance in the other models studied; then the variables were tested sequentially, considering P ≤0.05 as the criterion for remaining in the model. RESULTS: In the model, self-perception and self-esteem were statistically significant in relation to the perceived need for treatment. The normative need was significantly associated with the outcome variable and was not influenced by independent variables. CONCLUSIONS: The normative need for orthodontics treatment was not overestimated by the perceived need, and the perceived need was not influenced by sex and the impact on quality of life.
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Necessidades e Demandas de Serviços de Saúde , Ortodontia Corretiva/psicologia , Qualidade de Vida/psicologia , Autoimagem , Criança , Feminino , Humanos , Masculino , Má Oclusão/psicologia , Má Oclusão/terapia , Fatores SexuaisRESUMO
Hand hygiene is part of standard precautions and it has been emphasized that education of this practice depends on the individual's experience in general hygiene. The Hygiene Inventory (HI-23) assess the domains General Hygiene, in the fields of Hands, Personal, Household and Food. Aim: To make the transcultural adaptation of the HI-23 scale for PortugueseBrazil and to investigate and describe the hygiene behavior according to the HI-23 scale among dental students. Material and Methods: The cross-cultural adaptation process consisted in five steps: two translations, two back translations, review committee, pre-test with a population sample, and reproducibility and reliability of the instrument adapted. For the intra-examiner reproducibility it was applied kappa statistics. The statistical Cronbach's alpha verified the reliability of the HI-23 scale adapted to Portuguese. The adapted instrument was applied to 292 students of Dentistry from 1st to 5th year of graduation from a Faculty of Dentistry. Results: There was good reproducibility (0.43≥κ≥0.81) and good internal consistency (Cronbach's alpha=0.75) for the questions of the questionnaire. The adapted instrument applied among academics, showed that students have good and adequate hygiene pattern for most questions, except for the hygiene in the preparation of food and utensils used to prepare them, in the time spent washing hands, and cleanliness regarding the exchange of clothing (pants/skirt). Conclusion: The transcultural adaptation of the instrument for the Brazilian version was successfully obtained. The instrument can be safely applied to measure the profile of hygiene among professional of the health area.
A higiene das mãos é parte das precauções padrão e tem sido enfatizado que a educação dessa prática depende da experiência individual em higiene geral. O Inventario em Higiene (HI-23) avalia os domínios Higiene Geral, Mãos, Pessoal, Doméstica e na Alimentação. Objetivo: Realizar a adaptação transcultural da escala HI-23 para o português-Brasil e investigar e descrever o comportamento em higiene segundo o HI-23, entre acadêmicos de Odontologia. Material e Métodos: O processo de adaptação transcultural consistiu em cinco etapas: duas traduções; duas retrotraduções, comitê de revisão, pré-teste com uma amostra da população alvo, reprodutibilidade e confiabilidade do instrumento adaptado. Para a reprodutibilidade intraexaminador foi aplicada a estatística kappa. A estatística alfa de Cronbach verificou a confiabilidade da escala HI-23 adaptada para o português. O instrumento adaptado foi aplicado a 292 estudantes de Odontologia do 1º ao 5º ano do curso de graduação de uma Faculdade de Odontologia. Resultados: Houve boa reprodutibilidade (0,43≥k≥0,81) e boa consistência interna (alfa de Cronbach=0,75) para as perguntas do questionário. O instrumento adaptado aplicado entre os acadêmicos, mostrou que os estudantes possuem um padrão de higiene bom e adequado para a maioria das questões, com exceção da higiene no preparo de alimentos e utensílios utilizados para prepará-los, no tempo gasto para lavagem das mãos e no asseio quanto a troca de vestimenta (calça/saia). Conclusão: A adaptação do instrumento para a versão brasileira foi obtida com sucesso. O instrumento pode ser aplicado com segurança para medir o perfil em higiene entre profissionais da área da saúde.
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AIM: In the present study, we evaluated the efficacy of bleaching on enamel and opposite dentin surfaces using 35% hydrogen peroxide (HP) with the prior application of a desensitizing agent. METHODS: Thirty bovine dental fragments, with thicknesses of 1 mm enamel and 1.75 mm dentin, were stained in a solution of black tea. The fragments were randomly divided into three groups (n = 10) according to the following protocols: (a) 2% neutral fluoride + bleaching; (b) desensitizing agent + bleaching; and (c) without desensitizer + bleaching. The bleaching efficacy was evaluated four times: after staining with tea (baseline) and after each of the 3 weeks of bleaching, by means of the CIE Lab method using a reflectance spectrophotometer. The data coordinate L* was evaluated by an analysis of repeated measures with PROC MIXED and Tukey-Kramer's test. The ΔE values were subjected to anova and Tukey's test (α = 0.05). RESULTS: The 35% HP treatment showed greater efficacy on deep dentin after removal of the enamel stains, with increasing means during all times in all treatments. CONCLUSION: The use of a desensitizing agent prior to the bleaching session did not affect the mechanism of action of 35% HP with regard to tooth depth.
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Esmalte Dentário/efeitos dos fármacos , Dessensibilizantes Dentinários/uso terapêutico , Dentina/efeitos dos fármacos , Peróxido de Hidrogênio/uso terapêutico , Clareadores Dentários/uso terapêutico , Clareamento Dental/métodos , Animais , Bovinos , Cor , Esmalte Dentário/ultraestrutura , Fluoretos/uso terapêutico , Microscopia Eletrônica de Varredura , Nitratos/uso terapêutico , Compostos de Potássio/uso terapêutico , Distribuição Aleatória , Fluoreto de Sódio/uso terapêutico , Espectrofotometria/métodos , Chá , Fatores de Tempo , Descoloração de Dente/tratamento farmacológicoRESUMO
BACKGROUND: It is known that periodontal ligament (PDL) harbors a heterogeneous progenitor cell population at different stages of lineage commitment. However, characterization of PDL stem cells committed to osteoblast/cementoblast (O/C) differentiation remains to be elucidated. The present study is carried out to isolate single cell-derived, cluster of differentiation (CD)105-positive PDL clones and to characterize the clones that present high potential to differentiate toward O/C phenotype in vitro. METHODS: Isolation of single cell-derived colonies (clones) from a CD105-enriched PDL progenitor cell population was performed by the ring-cloning technique. Cell clones were evaluated for their O/C differentiation potential, metabolic activity, and expression of STRO-1 protein. Additionally, the clones that showed potential to O/C differentiation were characterized by quantitative reverse-transcription polymerase chain reaction (qRT-PCR) for expression of runt-related transcriptor factor 2 (RUNX2), alkaline phosphatase, CD105, and CD166 during osteogenic induction. RESULTS: Six PDL-CD105(+) clones were obtained, three being highly O/C clones (C-O) and three others that did not have the ability to produce mineralized matrix in vitro (C-F). The C-O group showed lower metabolic activity compared with the C-F group, and both cell groups were positively immunostained for STRO-1. qRT-PCR analysis demonstrated an increased expression of transcripts for RUNX2 and CD166 during the maturation of C-O cells toward O/C phenotype. CONCLUSIONS: These results provide evidence that PDL-CD105(+) purified progenitor cells comprise a heterogeneous cell population that presents a cell subset with high O/C potential and, further, that surface antigen CD166 is modulated during the O/C maturation of this cell subset.
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Cemento Dentário/citologia , Células-Tronco Mesenquimais/fisiologia , Osteoblastos/citologia , Ligamento Periodontal/citologia , Fosfatase Alcalina/análise , Antígenos CD/análise , Antígenos de Superfície/análise , Adesão Celular/fisiologia , Moléculas de Adesão Celular Neuronais/análise , Técnicas de Cultura de Células , Diferenciação Celular/fisiologia , Separação Celular , Células Clonais , Subunidade alfa 1 de Fator de Ligação ao Core/análise , Cemento Dentário/metabolismo , Endoglina , Proteínas Fetais/análise , Humanos , Osteoblastos/metabolismo , Osteogênese/fisiologia , Fenótipo , Receptores de Superfície Celular/análiseRESUMO
BACKGROUND: This study investigates the effect of photodynamic therapy (PDT) as monotherapy during supportive periodontal therapy. METHODS: A split-mouth, randomized controlled trial was conducted in patients with chronic periodontitis (N = 22) presenting at least three residual pockets (probing depth [PD] ≥5 mm with bleeding on probing [BOP]). The selected sites randomly received the following: 1) PDT; 2) photosensitizer (PS); or 3) scaling and root planing (SRP). At baseline and 3 and 6 months, clinical, microbiologic (real-time polymerase chain reaction analyses), cytokine pattern (multiplexed bead immunoassay), and patient-centered (regarding morbidity) evaluations were performed. RESULTS: All therapies promoted similar improvements in clinical parameters throughout the study (P <0.05), except that BOP was not reduced in the PS protocol (P >0.05). Lower levels of Aggregatibacter actinomycetemcomitans were observed in the PDT and SRP protocols at 3 months when compared with the PS protocol (P <0.05). An inferior frequency detection of Porphyromonas gingivalis was observed in the PDT protocol at 3 and 6 months and in the SRP protocol at 6 months from baseline (P <0.05). In addition, PDT protocol presented inferior frequency of P. gingivalis at 3 months when compared with the other therapies (P <0.05). Only patients in the PDT protocol exhibited augmented levels of anti-inflammatory interleukin (IL)-4 and reduced proinflammatory IL-1ß and IL-6 throughout the study (P <0.05). Intergroup analyses showed reduced IL-10 and increased interferon-γ and IL-1ß levels in the PS protocol when compared with the other therapies during follow-ups (P <0.05). No differences in morbidity were observed between the therapies (P >0.05), although the need for anesthesia was higher in SRP-treated sites (P <0.05). CONCLUSION: PDT as an exclusive therapy may be considered a non-invasive alternative for treating residual pockets, offering advantages in the modulation of cytokines.
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Periodontite Crônica/tratamento farmacológico , Fotoquimioterapia/métodos , Adulto , Idoso , Aggregatibacter actinomycetemcomitans/efeitos dos fármacos , Aggregatibacter actinomycetemcomitans/isolamento & purificação , Carga Bacteriana/efeitos dos fármacos , Periodontite Crônica/imunologia , Periodontite Crônica/microbiologia , Citocinas/análise , Raspagem Dentária/métodos , Feminino , Seguimentos , Humanos , Interferon gama/análise , Interleucina-1beta/análise , Interleucina-4/análise , Interleucina-6/análise , Masculino , Pessoa de Meia-Idade , Satisfação do Paciente , Índice Periodontal , Bolsa Periodontal/tratamento farmacológico , Bolsa Periodontal/imunologia , Bolsa Periodontal/microbiologia , Fármacos Fotossensibilizantes/uso terapêutico , Porphyromonas gingivalis/efeitos dos fármacos , Porphyromonas gingivalis/isolamento & purificação , Estudos Prospectivos , Aplainamento Radicular/métodos , Método Simples-Cego , Resultado do TratamentoRESUMO
AIM: The aim of the present study was to evaluate the microleakage in class II cavities restored with dental composite by varying the thickness of two flowable composite resins and the restorative technique. METHODS: A total of 130 cavities were prepared on proximal surfaces of bovine teeth and randomly divided in 13 groups. Twelve experimental groups were performed using flowable composite resin as the liner, and they were divided according to the type of flowable composite resin (Filtek Z350 Flow-Z350F and SureFil SDR Flow-SUR), the thickness of the flowable composite (0.5, 1, or 2 mm), and the restorative technique (flowable composite applied at the cavosurface angle or amelodentinal junction) (n = 10). A control group was performed without using a flowable composite. Following restorative procedures and thermocycling, the samples were immersed in Methylene Blue for 2 h, and prepared for analysis in an absorbance spectrophotometer. All results were statistically analyzed (α = 0.05). RESULTS: There was no significant difference between the flowable composites (P > 0.05). The restorative techniques influenced microleakage and were flowable composite dependent (P ≤ 0.05). The lower thickness of the flowable composite provided less microleakage (P ≤ 0.05). CONCLUSION: The use a lower thickness of a flowable composite resin provided less microleakage, suggesting a better sealing tooth-restoration interface.
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Resinas Compostas/química , Infiltração Dentária/classificação , Materiais Dentários/química , Restauração Dentária Permanente/métodos , Condicionamento Ácido do Dente/métodos , Animais , Bovinos , Corantes , Forramento da Cavidade Dentária/métodos , Preparo da Cavidade Dentária/classificação , Esmalte Dentário/ultraestrutura , Restauração Dentária Permanente/classificação , Dentina/ultraestrutura , Teste de Materiais , Azul de Metileno , Distribuição Aleatória , Espectrofotometria/instrumentação , Propriedades de Superfície , Temperatura , Fatores de Tempo , ViscosidadeRESUMO
AIM: To quantify the microleakage on restorations carried out with a two-step etch-and-rise adhesive system and nanofilled composite resin after thermal and mechanical loading cycling. METHODS: Ninety cavities were prepared on proximal surfaces of incisive teeth, and were randomly divided according to the photoactivation time (10, 20, or 30 s) and light-curing mode (Quartz Tungsten Halogen (QTH) lamps, 450 mW/cm(2); Light Emitting Diode (LED) second generation, 1100 mW/cm(2); or LED third generation, 700 mW/cm(2)) of an adhesive system (n = 10). Following restorative procedures and thermal and mechanical loading cycling, the samples were immersed in Methylene Blue for 2 h. The samples were ground, and the powder was prepared for analysis in an absorbance spectrophotometer. All results were statistically analyzed by anova and Tukey's test at the 5% level of significance. RESULTS: There were no significant statistical difference in microleakage between the light-curing mode (P = 0.1212) and light-curing time (P = 0.2043). CONCLUSION: Different curing modes and increasing the curing time were not factors that influenced the process of microleakage.
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Resinas Compostas/química , Cimentos Dentários/química , Infiltração Dentária/classificação , Materiais Dentários/química , Restauração Dentária Permanente/métodos , Condicionamento Ácido do Dente/métodos , Animais , Bovinos , Corantes , Lâmpadas de Polimerização Dentária/classificação , Preparo da Cavidade Dentária/classificação , Restauração Dentária Permanente/classificação , Teste de Materiais , Azul de Metileno , Nanocompostos/química , Ácidos Fosfóricos/química , Polimerização , Distribuição Aleatória , Espectrofotometria/instrumentação , Estresse Mecânico , Temperatura , Fatores de Tempo , Água/químicaRESUMO
STATEMENT OF PROBLEM: The lack of long-term bond stability between resin cements and dentin may compromise the success of indirect restorations. PURPOSE: The purpose of this study was to evaluate the effects of long-term storage in artificial saliva and mechanical load cycling on the microtensile bond strength of conventional and self-adhesive resin cements to dentin. MATERIAL AND METHODS: The occlusal dentin surfaces of 128 human molars were exposed and flattened. The teeth were assigned to 16 groups (n=8) according to resin cement and in vitro aging strategy. Two self-adhesive resin cements (RelyX Unicem and Clearfil SA Cement) and 2 conventional cementing systems (RelyX ARC and Clearfil Esthetic Cement) were used. Resin cements were applied to prepolymerized indirect resin disks, which were bonded to the dentin surfaces and light polymerized. The control groups were represented by immediate microtensile bond strength (24 hours) and aging methods were performed with mechanical load cycling or storage in artificial saliva (1 year and 2 years). Bonded beams were tested in tension until failure. Data (MPa) were analyzed by Proc Mixed for repeated measures and the Tukey-Kramer test (α=.05). RESULTS: The self-adhesive resin cements exhibited higher microtensile bond strength than conventional cementing systems for all conditions studied. The microtensile bond strength of RelyX ARC and self-adhesive resin cements did not decrease after storage in artificial saliva and mechanical load cycling. The Clearfil Esthetic Cement showed the lowest microtensile bond strength and a significant reduction after 2 years of storage in artificial saliva. CONCLUSIONS: The storage times and mechanical load cycling did not affect the microtensile bond strength of self-adhesives and RelyX ARC resin cements. The highest microtensile bond strength was obtained for self-adhesive resin cements, with no significant difference between them.
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Colagem Dentária , Dentina/ultraestrutura , Cimentos de Resina/química , Bis-Fenol A-Glicidil Metacrilato/química , Resinas Compostas/química , Análise do Estresse Dentário/instrumentação , Humanos , Cura Luminosa de Adesivos Dentários , Teste de Materiais , Polietilenoglicóis/química , Polimerização , Ácidos Polimetacrílicos/química , Saliva Artificial/química , Estresse Mecânico , Resistência à Tração , Fatores de TempoRESUMO
OBJECTIVES: This study evaluated the effectiveness of low- and high-concentration bleaching agents on enamel and deep dentin. STUDY DESIGN: Stained bovine incisors fragments were randomized placed into 10 groups (n=5), according to the sample thicknesses (2.0 mm or 3.5 mm) and bleaching agent: 10% carbamide peroxide (CP) (4 h a day/21 days); 6% hydrogen peroxide (HP) with calcium (1:30 h a day/21 days); HP 20% with calcium (50 min a day/3 sessions with a 7-day interval); HP 35% (3 x 15 min a day/3 sessions with a 7-day interval); HP 35% with calcium (40 min a day/3 sessions with a 7-day interval). The samples were stored in artificial saliva during the experiment. The color change was evaluated using a spectrophotometer at the initial analysis, after artificially staining with black tea and after each of the bleaching weeks, and data was expressed in CIE Lab System values. The L* coordinate data was submitted to analysis of variance and Tukey-Kramer test and the ?E values data was submitted for analysis of variance in a split-plot ANOVA and Tukey's test (?=0.05). RESULTS: None of the bleaching agents tested differed from the reflectance values on the enamel surface. For deep dentin HP 20% and HP 35%, both with calcium, showed the lowest reflectance values, which differed from CP 10%. CONCLUSION: It is concluded that high concentration hydrogen peroxide with calcium was less effective in deep dentin than 10% carbamide peroxide. Key words:Dental bleaching; hydrogen peroxide; carbamide peroxide; dental staining.
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OBJECTIVES: To associate the self-perception of oral health with sociodemographic, clinical, quality of life and geriatric depression, evaluating what influence in the self-perception of the elderly and the importance to the oral health. BACKGROUND: The current demographic transition and poor oral health of the elderly deserves particular attention, especially the impact of oral health on the quality of life. METHODS: In this cross-sectional study, we evaluated 371 elderly, aged 60 years or more, adscript to Health Family Units, Piracicaba city, Brazil. Clinically, the indexes decayed missing filled teeth (DMFT), CPI and Use/Need of Prosthesis (WHO/99) were used and evaluated by means of instruments such as the self-perceived oral health [geriatric oral health assessment index (GOHAI)], quality of life (SF-36) and geriatric depression (Geriatric Depression Scale). The statistical analyses were carried out by means of univariate analysis of chi-square and Fisher's exact (α = 0.05) and multiple logistic regression analysis. RESULTS: The mean age was 67.35 (2.8), with a mean DMFT of 28.5 (4.8) and a positive GOHAI score (>30). Most were women (63.3%), between 60 and 70 years (72.2%), married (60.4%), had just the elementary school (75.5%) education. Around 80% used some removable prosthetic. The results were associated with characteristics of self-perception of oral health and were significative of schooling (OR = 2.46) and the emotional aspects of quality of life (OR = 0.30). Over 20% of the sample had traits of depression, and these results were statistically significant (OR = 1.65) when associated with the GOHAI scores. CONCLUSION: Educational and emotional aspects and geriatric depression are factors that influence the positive self-perception of oral health of elderly people of Piracicaba USFs. These results represent that education, feelings and behaviours deserve special attention in their oral health, thereby approaching the self-perception of real dental condition.
Assuntos
Vida Independente , Saúde Bucal , Autoimagem , Idoso , Idoso de 80 Anos ou mais , Atitude Frente a Saúde , Brasil , Estudos Transversais , Índice CPO , Prótese Dentária , Depressão/psicologia , Escolaridade , Emoções , Feminino , Avaliação Geriátrica , Transição Epidemiológica , Humanos , Masculino , Estado Civil , Pessoa de Meia-Idade , Avaliação das Necessidades , Qualidade de Vida , Classe Social , Fatores SocioeconômicosRESUMO
Physical properties such as surface hardness of dental materials are directly linked to their clinical behavior. The aim of this study was to investigate the influence of extended curing time on the polymerization depth offluoride-containing materials used as pit and fissure sealants. Conventional and extended exposure times (20 and 60 seconds) were used to photoactivate a gold-standard pit and fissure sealant (Fluroshield, Dentsply) and a flowable composite (PermaFlo, Ultradent). Twenty square-shaped samples (n=5) were prepared using a LED device (Bluephase 16i, Ivoclar). The Knoop Hardness Number (KHN) was calculated for the top and bottom surface of each sample 24 hours after polymerization. Bottom/top hardness ratio (B/T KHN) was than calculated. Averages were analyzed by two-way ANOVA and Tukey test (alpha=0.05). The flowable composite had higher KHN than conventional pit and fissure sealant for all experimental conditions (p<0.05). The 60-second photoactivation time increased KHN at the bottom surface and B/T KHN only of composite specimens. The flowable composite had better physical properties than the pit and fissure sealant, and they were improved by extended curing time.
Assuntos
Selantes de Fossas e Fissuras/efeitos da radiação , Polimerização/efeitos da radiação , Fluoretos , Testes de Dureza , Teste de Materiais , Fatores de TempoRESUMO
BACKGROUND: Predicting risk of posteruptive enamel breakdown (PEB) of molar-incisor hypomineralization (MIH) opacity is a difficult but important clinical task. Therefore, there is a need to evaluate these aspects through longitudinal studies. OBJECTIVE: The aim of this longitudinal study was to analyse the relationship between colours of MIH opacity of children aged 6-12 (baseline) and other clinical and demographic variables involved in the increase in severity of MIH. MATERIALS AND METHODS: A blinded prospective 18-month follow-up was conducted with 147 individuals presenting mild MIH. Tooth-based incidence of increase in severity of MIH (PEB or atypical restorations) was used as dependent measurement. Enamel opacities were recorded according to colour shades of white, yellow and brown, allowing assessment of susceptibility to structural loss over time, according to colour of MIH opacity. Poisson regression models were used to adjust the results for demographic and clinical variables. RESULTS: Brown and yellow MIH opacities were at higher risk for PEB and atypical restorations than those of white ones, even after adjustment for clinical and demographic variables. CONCLUSION: Teeth presenting mild MIH severity associated with yellow and brown enamel opacities were at high risk for increase in severity of MIH than lighter ones. This result could help clinicians determine a risk-based treatment for children with MIH.
Assuntos
Hipoplasia do Esmalte Dentário/epidemiologia , Hipoplasia do Esmalte Dentário/patologia , Adolescente , Brasil/epidemiologia , Distribuição de Qui-Quadrado , Criança , Estudos de Coortes , Índice CPO , Hipoplasia do Esmalte Dentário/complicações , Feminino , Humanos , Incisivo/patologia , Masculino , Dente Molar/patologia , Prevalência , Estudos Prospectivos , Análise de Regressão , Fatores de Risco , Índice de Gravidade de Doença , Descoloração de Dente/etiologia , Descoloração de Dente/patologiaRESUMO
The present study investigated the distribution profile of dental caries and its association with areas of social deprivation at the individual and contextual level. The cluster sample consisted of 1,002 12-year-old schoolchildren from Piracicaba, SP, Brazil. The DMFT Index was used for dental caries and the Care Index was used to determine access to dental services. On the individual level, variables were associated with a better oral status. On the contextual level, areas were not associated with oral status. However, maps enabled determining that the central districts have better social and oral conditions than the deprived outlying districts.
Assuntos
Sistemas de Informação Geográfica , Saúde Bucal , Análise por Conglomerados , HumanosRESUMO
The purpose of this study was to evaluate the effects of five home bleaching products containing 15-16% carbamide peroxide on the microhardness of microhybrid composite resin Z-250 (3M/Espe). A total of 72 specimens were fabricated in cylindrical acrylic matrices (4 x 2 mm), filled with composite resin and photo-activated for 40 seconds. They were divided in 6 study groups (n = 12), according to the bleaching product: Review (SS White), Magic Bleaching (Vigodent), Opalescence (Ultradent), Whiteness Perfect (FGM), Claridex (Biodinâmica), and a control group (not bleached). Specimens were exposed to 1 cc of bleaching gel for 6 hours daily for 2 weeks. The control group specimens were kept in artificial saliva throughout this time. All the specimens were then analyzed in a microhardness tester. Knoop hardness measurements were performed, and the results were submitted to parametric statistical analysis (analysis of variance and Tukey's test). Mean Knoop values and standard deviation were: baseline, 68.52a (4.28); control, 63.42b (7.16); Whiteness Perfect, 57.57c (1.81); Magic Bleaching, 57.22c (3.84); Opalescence, 57.03cd (4.00); Claridex, 53.64de (3.33); Review 51.45e (2.82). Identical letters mean statistical equality according to Tukey's test at the 5% significance level. The products significantly decreased Z-250 (3M/Espe) microhardness.