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1.
Mem. Inst. Oswaldo Cruz ; 106(4): 385-389, June 2011. mapas, tab
Article in English | LILACS | ID: lil-592178

ABSTRACT

In order to mark Triatoma brasiliensis, the vector of Chagas disease in Brazil, two chemical compounds, rubidium chloride (RbCl) and chromium chloride (CrCl3), were tested. First, 199 N2-N5 nymphs were fed on blood with 0.025M RbCl. Rb marker positivity ranged from 2.5 percent (N3)-70 percent (N2), with a maximum persistence of 98 days. Second, 265 N2-N5 nymphs were fed on blood containing 0.0015M CrCl3. Cr marker positivity ranged up to 93 percent (N5), with a maximum persistence of 119 days. Finally, we blood fed 213 T. brasiliensis to investigate whether CrCl3 altered the biology of this insect. The developmental time of T. brasiliensis was unaltered, but the survival of the Cr-marked group was lower than that of the control group. Differences in the mean fecundity of the control (mean of 156.1) and experimental (mean of 135.6) groups were not statistically significant and 100 percent of the egg batches of females Cr-marked as nymphs were positive. In conclusion, CrCl3 is a useful tool for marking T. brasiliensis nymphs due to its high positivity and persistence.


Subject(s)
Animals , Female , Chlorides/pharmacokinetics , Chromium Compounds/pharmacokinetics , Coloring Agents/pharmacokinetics , Insect Vectors/physiology , Nymph/physiology , Rubidium/pharmacokinetics , Triatoma/physiology , Chagas Disease/transmission , Fertility , Fertility/physiology , Insect Vectors , Nymph , Time Factors , Triatoma
2.
Braz. dent. j ; 21(3): 216-219, 2010. ilus, tab
Article in English | LILACS | ID: lil-556820

ABSTRACT

This ex vivo study evaluated dentin permeability of the root canal in the apical third of different human groups of teeth. Eighty teeth were used, 8 from each dental group: maxillary and mandibular central incisors, lateral incisors and canines, maxillary first premolars (buccal and palatal roots), mandibular first premolars, and maxillary and mandibular second premolars, totalizing 88 roots that were distributed in 11 groups. The root canals were instrumented, irrigated with 1 percent NaOCl and 15 percent EDTA. Roots were immersed in 10 percent copper sulfate for 30 min and then in 1 percent rubeanic acid alcohol solution for the same period; this chemical reaction reveals dentin permeability by the formation of copper rubeanate, which is a dark-colored compound. Semi-serial 100-µm-thick cross-sections were obtained from the apical third of the roots. Five sections of each apical third were washed, dehydrated, cleared and mounted on glass slides for examination under optical microscopy. The percentage of copper ion infiltration and the amount of tubular dentin were quantified by morphometric analysis. The penetration of copper ions in the apical third ranged from 4.60 to 16.66 percent. The mandibular central and lateral incisors presented the highest dentin permeability (16.66 percent), while the maxillary canines and mandibular second and first premolars presented the lowest dentin permeability (4.60 percent, 4.80 percent and 5.71 percent, respectively; p<0.001). The other teeth presented intermediate permeability. In conclusion, dye penetration into dentin tubules at the apical region is strongly dependent on the group of teeth evaluated.


Este estudo ex vivo avaliou a permeabilidade da dentina do canal radicular do terço apical de diferentes grupos de dentes humanos. Foram utilizados 80 dentes, sendo 8 de cada grupo dental superior e inferior: incisivos centrais, incisivos laterais, caninos, primeiros pré-molares superiores (raízes vestibulares e palatinas), primeiros pré-molares inferiores, segundos pré-molares superiores e inferiores, totalizando 88 raízes, as quais foram distribuídas em 11 grupos. Os canais foram instrumentados, irrigados com NaOCl a 1 por cento e EDTA a 15 por cento. As raízes foram imersas em sulfato de cobre a 10 por cento por 30 min e acido rubeânico a 1 por cento pelo mesmo período. Esta reação química revela a permeabilidade da dentina por meio da formação de um complexo escurecido denominado rubeanato de cobre. Hemi-secções de 100 µm de espessura foram obtidas do terço apical da raiz. Cinco secções do terço apical foram lavadas, desidratadas, diafanizadas e montadas em lâminas para análise em microscopia óptica. A porcentagem de infiltração de íons cobre e a quantidade de dentina tubular foram quantificadas por meio de análise morfométrica. A penetração de íons cobre no terço apical da raiz variou de 4,60 por cento a 16,66 por cento. Os incisivos centrais e laterais apresentaram a maior permeabilidade dentinária (16,66 por cento), e os caninos superiores e segundos e primeiros pré-molares inferiores as menores (4,60 por cento, 4,80 por cento e 5,71 por cento, respectivamente; p<0,001). Os outros dentes apresentaram permeabilidade intermediaria. Conclui-se que a penetração de corante nos túbulos dentinários da região apical é extremamente dependente do grupo de dentes avaliado.


Subject(s)
Humans , Coloring Agents/pharmacokinetics , Dentin Permeability , Dental Pulp Cavity/metabolism , Tooth Apex , Thioamides/pharmacokinetics , Copper/pharmacokinetics , Mandible , Maxilla , Tooth/anatomy & histology , Tooth/metabolism
3.
Korean Journal of Ophthalmology ; : 367-370, 2010.
Article in English | WPRIM | ID: wpr-31142

ABSTRACT

We report a case of corneal deposition of pigments from cosmetic contact lenses after intense pulsed-light (IPL) therapy. A 30-year-old female visited our outpatient clinic with ocular pain and epiphora in both eyes; these symptoms developed soon after she had undergone facial IPL treatment. She was wearing cosmetic contact lenses throughout the IPL procedure. At presentation, her uncorrected visual acuity was 2/20 in both eyes, and the slit-lamp examination revealed deposition of the color pigment of the cosmetic contact lens onto the corneal epithelium. We scraped the corneal epithelium along with the deposited pigments using a no. 15 blade; seven days after the procedure, the corneal epithelium had healed without any complications. This case highlights the importance of considering the possibility of ocular complications during IPL treatment, particularly in individuals using contact lenses. To prevent ocular damage, IPL procedures should be performed only after removing the lenses and applying eyeshields.


Subject(s)
Adult , Female , Humans , Coloring Agents/pharmacokinetics , Contact Lenses/adverse effects , Cornea/metabolism , Cosmetic Techniques/adverse effects , Debridement , Epithelium, Corneal/surgery , Phototherapy/adverse effects , Postoperative Period , Treatment Outcome , Visual Acuity
4.
Braz. oral res ; 18(2): 174-179, Apr.-Jun. 2004. tab, graf
Article in English | LILACS | ID: lil-363270

ABSTRACT

O objetivo desta pesquisa foi avaliar o potencial irritativo de própolis, Casearia sylvestris, Otosporin e soro fisiológico (controle). Foram utilizados 28 ratos machos da linhagem Wistar. Os animais foram anestesiados e, em seguida, receberam a injeção do corante azul de Evans (2%) por via intravenosa na veia caudal. Em quatro pontos predeterminados e depilados da região dorsal de cada animal, foram injetados 0,1 ml das substâncias teste. Os animais foram sacrificados meia, uma, três e seis horas após a injeção das substâncias, e cada pedaço de pele contendo a lesão foi colocado em frascos contendo formamida, que foram incubados a 45oC por 72 h. Após esse período, as amostras foram filtradas e submetidas à análise em espectrofotômetro. Os dados foram submetidos ao teste estatístico não-paramétrico de medidas repetidas. No período de 3 h, foram observados os maiores valores de corante extraído, caracterizando, assim, o pico do processo inflamatório. A própolis foi a substância que apresentou menor potencial irritativo. Os produtos naturais testados neste trabalho podem ser uma alternativa para o tratamento endodôntico.


Subject(s)
Animals , Male , Rats , Anti-Inflammatory Agents/pharmacology , Capillary Permeability , Dental Pulp Cavity/drug effects , Coloring Agents/pharmacokinetics , Inflammation/drug therapy , Phytotherapy , Analysis of Variance , Anti-Infective Agents/pharmacology , Anti-Infective Agents/therapeutic use , Anti-Inflammatory Agents/therapeutic use , Casearia , Evans Blue/pharmacokinetics , Hydrocortisone/pharmacokinetics , Hydrocortisone/therapeutic use , Inflammation/metabolism , Propolis/pharmacology , Propolis/therapeutic use , Rats, Wistar , Sodium Chloride/pharmacology , Sodium Chloride/therapeutic use , Statistics, Nonparametric
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