The aim of this study was to evaluate the mechanical stability of resin-dentin bonds produced in vivo in the presence of chlorhexidine. Children presenting at least one pair of contralateral primary molars with occlusal carious lesions were enrolled in the study. After cavity preparation and phosphoric acid etching, dentin was treated with 5 microl of either 2% chlorhexidine (experimental group) or deionized water (control group) [corrected].Thirteen pairs of teeth were restored and were collected after physiological exfoliation. The periods in oral function after restoration were divided as follows: up to 30 d; and 1-5, 10-12, and 18-20 months. Beam-shaped specimens (0.81 mm(2)) were obtained and subjected to microtensile bond-strength testing. A significant decrease of the bond strength was observed in the control group starting at the 1-5 month period (30.6%), while in the experimental group this decrease started only after 10-12 months of function (26.3%). The use of chlorhexidine as an adjuvant to the adhesion to dentin did not produce any detrimental effect to the immediate bond strength and was capable of reducing the rate of resin-dentin bond degradation within the first few months after restoration.

Objective: The purpose of this study was to compare the immediate microtensile bond strength (µTBS) of two-step etch-and-rinse adhesive systems to the dentin of primary and permanent teeth. Study Design: Non-carious human teeth (12 primary molars and 12 premolars) were assigned to 3 groups according to the adhesive system. The adhesive systems were applied to flat superficial coronal dentin surfaces etched with phosphoric acid and composite resin blocks were built up. The teeth were sectioned to produce beam-shaped specimens with 0.81 mm2 cross-sectional area subjected to µTBS testing. µTBS data were analyzed statistically by ANOVA and Tukey’s test (a= 0.05). Results: The adhesive systems produced statistically similar mean µTBS to each other (p>0.05) and no significant differences (p>0.05) were found when the same material was applied to primary or permanent tooth dentin. The mean µTBS values (MPa) obtained were: Prime& Bond NT: 41.7±14.4 (permanent) and 40.8±13.4 (primary); Single Bond: 42.9±8.6 (permanent) and 41.4±11.9 (primary); Excite DSC: 46.3±11.3 (permanent teeth) and 43.4±12.0 (primary). Conclusion:There was no difference in the immediate µTBS of two-step etch-and-rinse adhesive systems when applied to the dentin of primary and permanent teeth.

Perimolysis is a form of dental erosion, characterized by dental tissue demineralization without bacterial involvement. It RESUMOPerimólise é uma forma de erosão dentária, caracterizada pela desmineralização do tecido dental sem envolvimento bacteriano, de origem intrínseca ou extrínseca. É considerada de origem extrínseca quando causada pelo consumo excessivo de bebidas, alimentos e substâncias ácidas, como refrigerantes, bebidas alcoólicas, frutas ácidas e medicamentos de uso contínuo. Denomina-se intrínseca quando causada por distúrbios gastrintestinais como os que ocorrem como conseqüência da bulimia, da anorexia nervosa e do refluxo gastresofágico. A ação ácida pode causar erosão nas faces palatina/lingual dos incisivos e palatina/lingual e oclusal dos dentes posteriores levando a dor, ou seja, hiperestesia dental. O tratamento geralmente é multidisciplinar, devendo identificar e eliminar ou controlar as causas. A abordagem odontológica deve associar medidas preventivas para diminuir riscos futuros e intervenção restauradora utilizando materiais como cimento ionômero de vidro, resina composta ou até mesmo endodontia e reabilitação protética para casos mais complexos. Este trabalho teve como objetivo descrever o tratamento restaurador de um caso clínico de paciente com esta patologia.Termos de indexação: Acidez. Esmalte dentário. Estética. Erosão dentária.

Background: The wettability of a surface is a prerequisite for adhesion and the type of dentine plays an important role in this property. This study evaluated the effect of different excipients of chlorhexidine (CHX) on sound and cariesaffected dentine wettability. Methods: Flat dentine surfaces were prepared (n = 100) and artificial caries was induced in half of the sample. For each substrate, sound and caries-affected dentine, surfaces were assigned to five groups: (1) smear-covered dentine; (2) smear-free dentine saturated with water; (3) ethanol; (4) 1% CHX in water; or (5) 1% chlorhexidine in ethanol. The infected dentine was ground with 320-grit silicon carbide paper to the level of affected dentine. The smear layer was removed with acid, followed by rinsing, blot drying and the application of each solution (60 seconds). Single Bond 2 was applied to each surface and contact angles were measured using a goniometer. Data were analysed by ANOVA and Student-Newman-Keuls (a = 0.05). Results: Contact angles were higher on sound dentine, regardless of the treatment. For sound and caries-affected dentine significantly higher angles were obtained on smear-covered dentine. Acid-etched dentine saturated with ethanol and ethanol/CHX resulted in significantly lower angles but only for sound dentine. Neither water and water/CHX nor ethanol and ethanol/CHX solutions differ with respect to dentine wettability. Conclusions: Caries-affected dentine wettability is higher than sound dentine, and chlorhexidine does not influence this property.

Disturbances of the dental development may result in anomalies, which may be apparent as soon as the child is born. Eruption cysts are rarely observed in neonates considering that at this stage of the child's life teeth eruption is uncommon. Thus, the aim of this report is to describe a case of eruption cysts in a neonate. A male neonate was brought to the emergency service with the chief complaint of an elevated area on the anterior region of the inferior alveolar ridge. The lesion was clinically characterized as a compressive and floating swelling. Through a radiographic exam two mandibular primary incisors could be seen superficially located. Due to the patient's age and the initial diagnosis of eruption cysts the conduct adopted was clinical surveillance. Forty-five days after the first visit the lesions had significantly decreased in size, and completely disappeared after 4 months. At that age, both mandibular central incisors were already in the oral cavity exhibiting small hypoplastic areas in the incisal edges. The clinical and radiographic follow-up of eruption cysts in neonates appears to be an adequate conduct without differing from that recommended for older children.

BackgroundTo investigate the influence of chemical and microbiological methods of caries induction on bond degradation of adhesive systems to primary dentin.MethodsFlat dentin surfaces from 36 primary molars were assigned to three groups (n = 12) according to method to induce caries-affected dentin: (1) control (sound dentin); (2) pH-cycling; and (3) microbiological caries induction model. Teeth were submitted to caries induction for 14 days for both methods, and the sound dentin was stored in distilled water during the same period. Specimens from each experimental group were then randomly reassigned to two subgroups (n = 6) according to the adhesive system tested: two-step etch-and-rinse adhesive (Adper Single Bond 2 - SB) or two-step self-etch system (Clearfil SE Bond - CSEB). Composite buildups were constructed and sectioned to obtain bonded sticks to be subjected to microtensile (μTBS) testing immediately or after 12 months of water aging. The μTBS means were analyzed by three-way repeated measures ANOVA and Tukey’s tests (α = 0.05).ResultsThe μTBS values obtained to artificially-created caries-affected dentin were lower compared with sound dentin, but were not affected by method of caries induction. Water storage for 12 months reduced bond strengths, except to CSEB bonded to sound dentin.ConclusionChemical and microbiological methods affect similarly the stability of resin-dentin bonds in primary teeth.

ResumoIntrodução: A halitose é uma condição em que o hálito se apresenta de forma desagradável, acometendo milhares de pessoas e causando impacto negativo para as mesmas. Objetivo: A presente pesquisa em campo buscou avaliar a percepção pessoal em relação à condição de halitose por meio de aplicação de questionário específico e confirmação clínica. Material e método: A amostra foi composta por 59 indivíduos entre 20 e 60 anos de idade, usuários de Unidades Básicas de Saúde de Araraquara, que foram selecionados de forma aleatória. A metodologia empregada constituiu-se de: i) Assinatura do Termo de Consentimento Livre e Esclarecido; ii) Aplicação de questionário especialmente elaborado para esta pesquisa; iii) Confirmação clínica, com a aplicação do teste com halímetro (Tanita Breath Alert CHC-212S). Após o experimento, todos receberam folhetos informativos com dados gerais sobre halitose. Os resultados obtidos foram agrupados em tabelas de contingência, construídas pelo Microsoft Excel, sendo então analisados pelo teste do Qui-quadrado. Resultado e conclusão: Após análises, conclui-se que as pessoas perderam a capacidade de perceber o próprio hálito quando tinham halitose; não tiveram condições de se autoavaliarem de forma eficaz; os fatores de riscos que influenciaram na halitose foram: idade superior aos 40 anos, uso de alguns tipos de medicamentos, algumas patologias, frequência de visita ao Dentista e falhas em procedimentos de higiene bucal, tais como escovação dentária, uso do fio dental, limpeza da língua e limpeza de próteses. Os outros fatores pesquisados não se mostraram estatisticamente suficientes para estabelecerem relação de influência na halitose.Descritores: Halitose; diagnóstico; bactérias anaeróbias. AbstractIntroduction: Halitosis is a condition characterized by unpleasant breath, affecting thousands of people and causing a negative impact on them. Objective: The aim of this study was to evaluate self-perception of halitosis condition by applying a specific questionnaire and having clinical evaluation. Material and method: The sample was composed by 59 randomly selected voluntaries between the ages of 20 and 60 years old who were users of Basic Health Units of Araraquara. The methodologies applied were: 1. Signature of informed consent; 2. Application of standardized questionnaire specially designed for this research; 3. Clinical confirmation through halimeter (Tanita Breath Alert CHC-212S). After the experimental phase, all the volunteers received a document with general information about halitosis (causes and treatment). The results were grouped in Microsoft Excel tables and analyzed by Chi-square test. Result and conclusion: After the analyses, it was concluded that people had lost the ability to perceive their own breath when they had halitosis and they are unable to evaluate themselves effectively; the risky factors that influenced the halitosis were: people over the age of 40, the use some types of drugs, some diseases, frequency of visit to the dentist and poor oral hygiene including bad...

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