Ação antimicrobiana de medicações intracanal sobre dentina infectada de dentes decíduos e permanentes

Objetivo: o objetivo deste estudo foi avaliar a efetividade antimicrobiana de medicações intracanal em dentina infectada de dentes decíduos e permanentes. Métodos:blocos de dentina foram inoculados com Enterococcus faecalis a cada 72 horas durante 60 dias; após, foram irrigados,secos e completamente preenchidos com uma das misturas a seguir: 1) pó de hidróxido de cálcio, própolis e propilenoglicol, 2) pó de hidróxido de cálcio e propilenoglicol,3) pó de hidróxido de cálcio e água destilada,4) própolis e propilenoglicol, 5) própolis e água destilada.Após 30 dias, as amostras foram lavadas com água destilada esterilizada, imersas em Letheen broth e incubadas por 48 horas a 37ºC. Resultados e Conclusão: a hipótese de que a associação do hidróxido de cálcio com própolis poderia ser mais eficaz do que os outros medicamentos não foi confirmada, pois os resultados indicaram que todas as misturas testadas não foram capazes de inibir o biofilme de E. faecalis, tanto nos blocos de dentina de dentes decíduos como permanentes

Dental sedation by dentists: a view from anesthesiologists working in central Western Brazil.

BACKGROUND: Anesthesia care has been provided by diverse health professionals worldwide, but little is known about anesthesiologists' views about this. Using a survey, we sought the opinions of a group of Brazilian anesthesiologists regarding nitrous oxide/oxygen and oral minimal/moderate sedation performed by dentists. METHODS: A 3-part postal questionnaire was sent to 206 physician anesthesiologists working in the state of Goias, in Central Western Brazil. Part 1 consisted of 4 questions describing respondents' characteristics: gender, time elapsed since completion of the residency program, and experience in providing sedation and general anesthesia for dental treatment. In Part 2, respondents were asked to give their opinions on 11 statements about sedation performed by dentists. Possible responses ranged from total disagreement to total agreement (minimum score = 11 and maximum score = 55). Part 3 was a section for general comments. Data were analyzed by k-means clusters, chi(2), and Student's t-test. RESULTS: The response rate was 53.8% (111 questionnaires). Most anesthesiologists (85.6%) had rarely or never provided sedation or general anesthesia for dental treatment, and 92.8% disagreed with the statement that dentists can administer moderate sedation in the dental office. Two clusters representing more favorable (n = 21) or less favorable (n = 90) opinions were established. Anesthesiologists in the "less favorable" group had more experience with dental sedation (P = 0.006) and dental general anesthesia (P = 0.008) than those in the "more favorable" group. Gender and time elapsed since residency completion did not significantly affect anesthesiologists' opinions. CONCLUSIONS: Many anesthesiologists in Central Western Brazil do not sedate dental patients and are not confident that dentists are able to do it. Dental sedation is an issue that still needs to be clarified in this region; the respective roles of physicians and dentists need to be determined to benefit the population.

Structure and microstructure of coronary dentin in non-erupted human deciduous incisor teeth.

The dentin structure of non-erupted human deciduous mandibular and maxillary central and lateral incisor teeth was studied employing light and scanning electron microscopy. For light microscopy, nitric-acid-demineralized and ground sections were used. The sections were stained by hematoxylin-eosin, picrosirius and azo-carmine methods, and ground specimens were prepared using a carborundum disk mounted in a handpiece. For SEM study, teeth were frozen in liquid nitrogen and fractured at longitudinal and transversal directions. Structurally, demineralization and ground methods revealed tubules with primary and secondary curvatures, canaliculi, giant tubules, interglobular dentin, predentin, and intertubular dentin. Scanning electron microscopy showed three-dimensional aspects of dentinal tubules, canaliculi, peritubular dentin, intertubular dentin, and predentin. This study contributes to knowledge about dentin morphology showing characteristics of teeth not yet submitted to mastication stress.

Structure and microstructure of coronary dentin in non-erupted human deciduous incisor teeth

The dentin structure of non-erupted human deciduous mandibular and maxillary central and lateral incisor teeth was studied employing light and scanning electron microscopy. For light microscopy, nitric-acid-demineralized and ground sections were used. The sections were stained by hematoxylin-eosin, picrosirius and azo-carmim methods, and ground specimens were prepared using a carborundum disk mounted in a handpiece. For SEM study, teeth were frozen in liquid nitrogen and fractured at longitudinal and transversal directions. Structurally, demineralization and ground methods revealed tubules with primary and secondary curvatures, canaliculi, giant tubules, interglobular dentin, predentin, and intertubular dentin. Scanning electron microscopy showed three-dimensional aspects of dentinal tubules, canaliculi, peritubular dentin, intertubular dentin, and predentin. This study contributes to knowledge about dentin morphology showing characteristics of teeth not yet submitted to mastication stress

A sem study of prismless enamel in non-erupted human deciduos teeth

The frequency, structure, and thickness of the prismless enamel layer in the bucal and lingual surfaces of nonerupted anterior deciduous teeth were described. The samples were fixed in a modified Karnovsky solution, longitudinally fractured in liquid nitrogen and observed by scanning electron microscopy. The aprismatic area was observed in the incisal and perpendicular to the enamel outer surface. Some depressions were observed on the enamel surface. The statistical analysis showed no significant differences related to prismless enamel thickness among upper and lower central incisors, lateral incisors and canines, which varied from 4,19 to 5.15um.