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1.
Materials (Basel) ; 14(21)2021 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-34772072

RESUMO

Non-hydrogenated amorphous-silicon films were deposited on glass substrates by Radio Frequency magnetron sputtering with the aim of being used as precursor of a low-cost absorber to replace the conventional silicon absorber in solar cells. Two Serie of samples were deposited varying the substrate temperature and the working gas pressure, ranged from 0.7 to 4.5 Pa. The first Serie was deposited at room temperature, and the second one, at 325 °C. Relatively high deposition rates above 10 Å/s were reached by varying both deposition temperature and working Argon gas pressure to ensure high manufacturing rates. After deposition, the precursor films were treated with a continuous-wave diode laser to achieve a crystallized material considered as the alternative light absorber. Firstly, the structural and optical properties of non-hydrogenated amorphous silicon precursor films were investigated by Raman spectroscopy, atomic force microscopy, X-ray diffraction, reflectance, and transmittance, respectively. Structural changes were observed in the as-deposited films at room temperature, suggesting an orderly structure within an amorphous silicon matrix; meanwhile, the films deposited at higher temperature pointed out an amorphous structure. Lastly, the effect of the precursor material's deposition conditions, and the laser parameters used in the crystallization process on the quality and properties of the subsequent crystallized material was evaluated. The results showed a strong influence of deposition conditions used in the amorphous silicon precursor.

2.
Med Oral Patol Oral Cir Bucal ; 22(2): e233-e241, 2017 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-28160587

RESUMO

BACKGROUND: Displaced maxillary permanent canine is one of the more frequent findings in canine eruption process and it's easy to be outlined and early diagnosed by means of x-ray images. Late diagnosis frequently needs surgery to rescue the impacted permanent canine. In many cases, interceptive treatment to redirect canine eruption is needed. However, some patients treated by interceptive means end up requiring fenestration to orthodontically guide the canine to its normal occlusal position. It would be interesting, therefore, to discover the dental characteristics of patients who will need additional surgical treatment to interceptive treatment. MATERIAL AND METHODS: To study the dental characteristics associated with canine impaction, conventional statistics have traditionally been used. This approach, although serving to illustrate many features of this problem, has not provided a satisfactory response or not provided an overall idea of the characteristics of these types of patients, each one of them with their own particular set of variables. Faced with this situation, and in order to analyze the problem of impaction despite interceptive treatment, we have used an alternative method for representing the variables that have an influence on this syndrome. This method is known as Self-Organizing Maps (SOM), a method used for analyzing problems with multiple variables. RESULTS: We analyzed 78 patients with a PMC angulation higher than 100 . All of them were subject to interceptive treatment and in 21 cases it was necessary to undertake the above-mentioned fenestration to achieve the final eruption of the canine. CONCLUSIONS: In this study, we describe the process of debugging variables and selecting the appropriate number of cells in SOM so as to adequately visualize the problem posed and the dental characteristics of patients with regard to a greater or lesser probability of the need for fenestration.


Assuntos
Dente Canino , Ortodontia Interceptora , Dente Impactado/terapia , Adolescente , Criança , Feminino , Humanos , Masculino
3.
Int J Oral Maxillofac Surg ; 46(4): 490-495, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-28034574

RESUMO

The objective of this study was to compare different cephalometric variables in adult patients with class III malocclusions before and after treatment, in order to determine which variables are indicative of orthodontic camouflage or orthognathic surgery. The cases of 156 adult patients were assessed: 77 treated with orthodontic camouflage and 79 treated with orthodontics and orthognathic surgery. The following cephalometric variables were measured on pre-treatment (T1) and post-treatment (T2) lateral cephalograms: sella-nasion-A-point (SNA), sella-nasion-B-point (SNB), and A-point-nasion-B-point (ANB) angles, Wits appraisal, facial axis angle, mandibular plane angle, upper and lower incisor inclination, and inter-incisal angle. There were statistically significant differences in cephalometric variables before and after treatment between the two groups. The percentage of normal pre-treatment measurements in the camouflage orthodontics group was 30.7%, which worsened slightly to 28.4% post-treatment. However in the group receiving surgery, this was 24.5% pre-treatment, improving to 33.5% after surgery. SNA, SNB, Wits appraisal, lower incisor inclination, and inter-incisal angle showed differences between the two groups before and after treatment. Wits appraisal, lower incisor inclination, and inter-incisal angle were indicative of one or other treatment. Upper and lower incisor decompensation in both groups did not reach ideal values, which impeded complete skeletal correction in 52% of surgical cases.


Assuntos
Cefalometria , Má Oclusão Classe III de Angle/diagnóstico por imagem , Má Oclusão Classe III de Angle/terapia , Ortodontia Corretiva , Procedimentos Cirúrgicos Ortognáticos , Adulto , Pontos de Referência Anatômicos , Estudos Transversais , Feminino , Humanos , Masculino , Resultado do Tratamento
4.
Nanotechnology ; 27(18): 185401, 2016 May 06.
Artigo em Inglês | MEDLINE | ID: mdl-27005494

RESUMO

We report a hybrid solar cell based on single walled carbon nanotubes (SWNTs) interfaced with amorphous silicon (a-Si). The high quality carbon nanotube network was dry transferred onto intrinsic a-Si forming Schottky junction for metallic SWNT bundles and heterojunctions for semiconducting SWNT bundles. The nanotube chemical doping and a-Si surface treatment minimized the hysteresis effect in current-voltage characteristics allowing an increase in the conversion efficiency to 1.5% under an air mass 1.5 solar spectrum simulator. We demonstrated that the thin SWNT film is able to replace a simultaneously p-doped a-Si layer and transparent conductive electrode in conventional amorphous silicon thin film photovoltaics.

6.
Eur J Orthod ; 35(1): 1-6, 2013 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-21427171

RESUMO

The aims of the study were to assess speed, reliability, accuracy, and reproducibility in measuring mesiodistal tooth sizes, bicanine widths, bimolar widths, and arch lengths (ALs) using cone beam computed tomography (CBCT) and to compare them with the same measurements obtained using a two-dimensional (2D) Digital Method. Plaster study models were made for 27 patients and then digitalized and measured using a 2D Digital Method. CBCTs were undertaken on the same 27 patients using the Dental Picasso Master 3D® and the images obtained were then analysed using the InVivoDental program. The correlation study of the two measuring methods, which were compared by determining the regression parameters and the values of one method as opposed to the other, show how both methods are comparable, although the mean and standard deviation of all the measurements analysed present statistically significant differences for the first upper right premolar, first upper left molar, first lower left premolar, and second lower right premolar, as well for the lower intercanine distance and lower AL. The differences, however, are less than 1 per cent. CBCT digital models are as accurate and reliable as the digital models obtained from plaster casts. The differences existing between both methods are clinically acceptable.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Modelos Dentários/normas , Dente Molar/diagnóstico por imagem , Dente/diagnóstico por imagem , Adulto , Idoso , Dente Pré-Molar/anatomia & histologia , Dente Pré-Molar/diagnóstico por imagem , Arco Dental/anatomia & histologia , Arco Dental/diagnóstico por imagem , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Dente Molar/anatomia & histologia , Odontometria/métodos , Reprodutibilidade dos Testes , Dente/anatomia & histologia
7.
An Pediatr (Barc) ; 75(5): 320-8, 2011 Nov.
Artigo em Espanhol | MEDLINE | ID: mdl-21703952

RESUMO

OBJECTIVES: To assess the diagnostic value of fractional exhaled nitric oxide (FE(NO)) in mild asthma. MATERIAL AND METHODS: Cross-sectional descriptive study in a group of patients with no history of respiratory or allergic illness (control group) and a group of patients with a history of mild asthma with no baseline treatment (asthma group), both aged 6 to 14 years. The following examinations were performed: measurement of FE(NO) using the portable NIOX MINO(®) device, allergy tests and spirometry. Repeatability of paired FE(NO) measurements was estimated with the intraclass correlation coefficient, the repeatability coefficient and the variation coefficient. The diagnostic value was assessed with the sensitivity, specificity, area under the ROC curve and positive likelihood ratio (LR+) for each cut-off point. RESULTS: Eighty-seven patients were included in the control group and 57 in the asthma group. The mean FE(NO) value was 12.1 ppb (SD 13.5) in the control group and 42.9 ppb (SD 24.5) in asthmatics (P<.001). The intraclass correlation coefficient was 0.98 (95% CI: 0.96-0.99) and of 0.97 (95% CI: 0.92-0.99) in controls and asthmatics, respectively. The repeatability coefficient was 5.5 in controls and 9.2 in asthmatic children, and the median variation coefficient was 8.3% and 6.1%. The optimal cut-off value for FE(NO) was 19 ppb (sensitivity and specificity were 91.4% and 87.2%, respectively). The area under the ROC curve was 0.93 (95% CI: 0.88-0.97) (P<.001) and the LR+ was 7.1. Subclinical sensitisation to pneumoallergens accounted for most false positive cases. CONCLUSIONS: The determination of FE(NO) with NIOX MINO(®) has an adequate repeatability, especially for healthy patients. For asthmatic patients we recommend determining the average of two measurements. The test has a high diagnostic value in mild asthma. Subclinical sensitisation to pneumoallergens can cause the FE(NO) value to rise to pathologic levels.


Assuntos
Asma/diagnóstico , Óxido Nítrico/análise , Adolescente , Testes Respiratórios , Criança , Estudos Transversais , Feminino , Humanos , Masculino , Estudos Prospectivos , Sensibilidade e Especificidade , Índice de Gravidade de Doença
8.
Eur J Orthod ; 30(3): 295-8, 2008 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-18263887

RESUMO

Arch length (AL), intercanine width (ICW), and intermolar width (IMW) are essential for diagnosis and treatment planning and are closely related factors in orthodontics. The aim of the present study was to determine correlations between these measurements and to predict some of these measurements based on others. The dental casts of 197 Spanish patients (119 females and 78 males) with a mean age of 18 years (11-26 years) in the permanent dentition attending the Orthodontic Department of the University of Valencia, Spain, were selected. ICW, IMW, and AL on each dental cast were measured using a previously tested digital method. Correlation between variables was determined using Pearson's correlation coefficient. Linear regression analysis was applied and the 95 per cent confidence intervals (CIs) for slope and intercept were determined. The data showed very high correlations between ICW and AL, both for the upper and lower arches and for males and females, r = 0.925. This coefficient was very close to 1, indicating a linear relationship. The regression equation for AL and ICW was AL = 1.36 ICW + 29.39 for both arches. There was very high correlations between AL and ICW for the upper and lower arches and a regression equation between both magnitudes was established indicating that the size of one factor can be predicted by knowing the other. For an increase of 1 mm in ICW, the AL increases approximately 1.36 mm with a 95 per cent CI (1.30-1.42).


Assuntos
Dente Canino , Arco Dental/anatomia & histologia , Mandíbula/anatomia & histologia , Maxila/anatomia & histologia , Adolescente , Adulto , Cefalometria , Feminino , Humanos , Masculino , Modelos Dentários , Odontometria , Fatores Sexuais , Estatísticas não Paramétricas
9.
HIV Med ; 8(7): 451-6, 2007 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-17760737

RESUMO

OBJECTIVES: The aim of this study was to determine whether oral zidovudine (ZDV) given during labour would provide a similar systemic exposure to the established intravenous regimen used to prevent mother-to-child transmission in HIV-infected pregnant women. METHODS: ZDV pharmacokinetic parameters following oral administration during labour were determined in 10 HIV-infected pregnant women in active labour. All subjects were converted to intravenous ZDV prior to delivery. RESULTS: In cohort 1 (n=6), subjects received 300 mg oral ZDV every 3 h for three doses. Oral therapy was well tolerated but plasma ZDV concentrations were substantially lower than previously reported with continuous intravenous therapy. Based on the pharmacokinetic results from cohort 1, women in cohort 2 (n=4) received an initial 600 mg dose followed by two 400 mg doses every 3 h. ZDV area under the curve and concentrations in cohort 2 increased approximately in proportion to the increase in dose but varied 6-7-fold. In both cohorts, ZDV pharmacokinetic parameters suggested erratic absorption. CONCLUSIONS: While ZDV exposure improved with the increased dosing regimen, our sample size was small and larger studies are needed to establish whether oral ZDV administration during labour can consistently provide equivalent exposure to intravenous administration.


Assuntos
Síndrome da Imunodeficiência Adquirida/tratamento farmacológico , Fármacos Anti-HIV/administração & dosagem , Infecções por HIV/prevenção & controle , Transmissão Vertical de Doenças Infecciosas/prevenção & controle , Complicações Infecciosas na Gravidez/tratamento farmacológico , Zidovudina/administração & dosagem , Administração Oral , Adulto , Fármacos Anti-HIV/farmacocinética , Área Sob a Curva , Estudos de Coortes , Feminino , Infecções por HIV/transmissão , Humanos , Lactente , Recém-Nascido , Trabalho de Parto/efeitos dos fármacos , Gravidez , Zidovudina/farmacocinética
10.
P. R. health sci. j ; P. R. health sci. j;25(2): 163-165, Jun. 2006.
Artigo em Inglês | LILACS | ID: lil-472184

RESUMO

Placenta previa percreta with bladder invasion occurs rarely. However this disorder has become more common since the increased rate of cesarean deliveries. We present a 26 year old gravida 3, para 2-0-1-2 female with placenta previa, percreta and bladder invasion to stress out the importance of early recognition of this life threatening condition and to point out that the good outcome of this case was mainly due to the multidisciplinary approach chosen during the preoperative and post operative management. The Departments of Obstetrics and Gynecology, Radiology, Anesthesiology, Urology, Neonatology and Pathology were fully involved. A surgical management was chosen since it is the most common and more accepted treatment of placenta previa percreta with bladder invasion.


Assuntos
Humanos , Feminino , Adulto , Doenças da Bexiga Urinária/cirurgia , Placenta Acreta/cirurgia , Placenta Prévia/cirurgia , Índice de Apgar , Bexiga Urinária/cirurgia , Cesárea , Doenças da Bexiga Urinária/diagnóstico , Doenças da Bexiga Urinária , Histerectomia , Recém-Nascido , Gravidez , Resultado da Gravidez , Cuidado Pré-Natal , Placenta Acreta/diagnóstico , Placenta Acreta , Placenta Prévia/diagnóstico , Placenta Prévia , Ultrassonografia Doppler em Cores
11.
Eur J Orthod ; 28(2): 120-5, 2006 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-16373454

RESUMO

The Bolton Index is one of the most useful calculations for precise orthodontic diagnosis as it shows if there is a correct ratio between dental proportions. However, at times, this calculation is not applied because it is a long and time-consuming procedure compared with digital methods. A new digital method for measuring tooth sizes and for calculating the Anterior (ABI) and the Overall (OBI) Bolton Index was tested on 100 sets of study dental casts of the permanent dentition in a Spanish sample and compared with the traditional method. The reproducibility of this digital method versus the traditional one was analysed to determine intra- and inter-examiner measurement errors by calculating the coefficients of variation. The results demonstrated that the digital method provided results comparable with those of the traditional technique, since the regression parameters for each index showed that the correlation coefficients of the two methods were very high and similar to each other: r = 0.976 and r = 0.979 for the ABI and OBI, respectively. The results also showed more discrepancies in the ABI than in the OBI using both methods in this sample.


Assuntos
Processamento de Imagem Assistida por Computador/métodos , Odontometria/métodos , Dente/anatomia & histologia , Adolescente , Adulto , Dente Pré-Molar/anatomia & histologia , Criança , Dente Canino/anatomia & histologia , Feminino , Humanos , Incisivo/anatomia & histologia , Masculino , Modelos Dentários , Dente Molar/anatomia & histologia , Variações Dependentes do Observador , Odontometria/instrumentação , Odontometria/estatística & dados numéricos , Reprodutibilidade dos Testes
12.
ASDC J Dent Child ; 67(4): 288-92, 2000.
Artigo em Inglês | MEDLINE | ID: mdl-10997247

RESUMO

An orthodontic-surgical treatment of a high labially impacted maxillary canine is described. The use of a transcoronal wire is recommended as a rapid and safe method to force the eruption of the unfavorable impacted canines. Minimal surgical exposure of the crown is necessary to place a transcoronal wire which can be easily inserted during surgery. Although the canine in the presented case was in an unfavorable position, and the root already formed, it was moved from its initial high position to occlusion in about one year with no loss of vitality and no periodontal anomalies.


Assuntos
Dente Canino/cirurgia , Fios Ortodônticos , Erupção Dentária , Dente Impactado/cirurgia , Adolescente , Terapia Combinada , Dente Canino/diagnóstico por imagem , Feminino , Humanos , Maxila , Aparelhos Ortodônticos , Radiografia , Aço Inoxidável , Retalhos Cirúrgicos , Fatores de Tempo , Coroa do Dente/cirurgia , Técnicas de Movimentação Dentária/instrumentação , Técnicas de Movimentação Dentária/métodos , Dente Impactado/diagnóstico por imagem
13.
AIDS ; 14(10): 1389-99, 2000 Jul 07.
Artigo em Inglês | MEDLINE | ID: mdl-10930154

RESUMO

OBJECTIVE: To evaluate independent contributions of maternal factors to adverse pregnancy outcomes (APO) in HIV-infected women receiving antiretroviral therapy (ART). DESIGN: Risk factors for preterm birth (< 37 weeks gestation), low birth weight (LBW) (< 2500 g), and intrauterine growth retardation (IUGR) (birth weight < 10th percentile for gestational age) examined in 497 HIV-infected pregnant women enrolled in PACTG 185, a perinatal clinical trial. METHODS: HIV RNA copy number, culture titer, and CD4 lymphocyte counts were measured during pregnancy. Information collected included antenatal use of cigarettes, alcohol, illicit drugs; ART; obstetric history and complications. RESULTS: Eighty-six percent were minority race/ethnicity; 86% received antenatal monotherapy, predominantly zidovudine (ZDV), and 14% received combination antiretrovirals. Preterm birth occurred in 17%, LBW in 13%, IUGR in 6%. Risk of preterm birth was independently associated with prior preterm birth [odds ratio (OR) 3.34; P < 0.001], multiple gestation (OR, 6.02; P = 0.011), antenatal alcohol use (OR, 1.91; P = 0.038), and antenatal diagnosis of genital herpes (OR, 0.24; P = 0.022) or pre-eclampsia (OR, 6.36; P = 0.025). LBW was associated with antenatal diagnosis of genital herpes (OR, 0.08; P = 0.014) and pre-eclampsia (OR, 5.25; P = 0.049), and baseline HIV culture titer (OR, 1.41; P = 0.037). IUGR was associated with multiple gestation (OR, 8.20; P = 0.010), antenatal cigarette use (OR, 3.60; P = 0.008), and pre-eclampsia (OR, 12.90; P = 0.007). Maternal immune status and HIV RNA copy number were not associated with APO. CONCLUSIONS: Risk factors for APO in antiretroviral treated HIV-infected women are similar to those reported for uninfected women. These data suggest that provision of prenatal care and ART may reduce APO.


Assuntos
Fármacos Anti-HIV/uso terapêutico , Retardo do Crescimento Fetal/etiologia , Infecções por HIV/complicações , Infecções por HIV/tratamento farmacológico , Complicações Infecciosas na Gravidez/tratamento farmacológico , Zidovudina/uso terapêutico , Adulto , Método Duplo-Cego , Feminino , Humanos , Recém-Nascido de Baixo Peso , Recém-Nascido , Recém-Nascido Prematuro , Análise Multivariada , Gravidez , Fatores de Risco
14.
J Infect Dis ; 180(5): 1536-41, 1999 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-10515813

RESUMO

Didanosine (ddI) pharmacokinetics in antepartum and postpartum human immunodeficiency virus (HIV)-infected women and their neonates were studied. HIV-infected pregnant women received an intravenous (iv) ddI infusion (1.6 mg/kg/h) or an oral dose (200 mg bid or 125 mg bid) at 31 weeks antepartum and 6 weeks postpartum. Blood samples were obtained regularly up to 6 or 8 h after drug administration. The same oral dose of ddI (bid) was administered until labor began. Then, ddI was infused iv until delivery. An oral pharmacokinetic study (60 mg/m2) was conducted in infants at day 1 and at week 6 after birth. Plasma concentrations of ddI were measured by radioimmunoassay. After iv ddI administration, only the maternal plasma clearance was found to be significantly increased antepartum (1028+/-231 mL/min) versus postpartum (707+/-213 mL/min). No pharmacokinetic parameters after oral administration were significantly affected by pregnancy. The pharmacokinetics of ddI in the neonates were highly variable. We conclude that the oral ddI dose need not be adjusted during pregnancy.


Assuntos
Fármacos Anti-HIV/farmacocinética , Didanosina/farmacocinética , Infecções por HIV/metabolismo , Complicações Infecciosas na Gravidez/metabolismo , Fármacos Anti-HIV/sangue , Fármacos Anti-HIV/uso terapêutico , Didanosina/sangue , Didanosina/uso terapêutico , Feminino , Sangue Fetal/química , Infecções por HIV/tratamento farmacológico , Meia-Vida , Humanos , Recém-Nascido , Gravidez , Complicações Infecciosas na Gravidez/tratamento farmacológico
16.
Cell Mol Biol (Noisy-le-grand) ; 45(4): 423-31, 1999 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-10432189

RESUMO

Vertical transmission of HIV-1 can occur at three different stages: during gestation, delivery and breast feeding. To determine the role of cytokines in vertical transmission of HIV during gestation, we studied the secretion of IL-1beta, TNF-alpha and IL-6 from in vitro infected and Mock-infected placental macrophages (Hofbauer cells) in comparison to blood monocyte derived macrophages (MDM). Hofbauer cells stimulated with lipopolysaccharide (LPS) secreted lower levels of HIV stimulatory cytokines (6-8 ng/ml) in the supernatants than MDM (26 ng/ml, p<0.005). Cytokine levels in MDM decreased upon HIV infection to 7 ng/ml. IL-6 was the major cytokine produced after LPS stimulation by the two cell populations (p<0.005), being MDM the major cytokine producer. In vitro infection studies with a M-tropic virus (HIV-BaL) indicated that MDM were 10x more susceptible to HIV than placental macrophages (p=0.001). Our results indicate that although macrophages from term placenta secrete lower amount of HIV stimulatory cytokines than MDM, there was no correlation between the levels of cytokines and HIV production by both cells.


Assuntos
Citocinas/metabolismo , HIV-1/imunologia , Macrófagos/imunologia , Macrófagos/virologia , Placenta/virologia , Células Cultivadas , Feminino , Citometria de Fluxo , Humanos , Interleucina-1/metabolismo , Interleucina-6/metabolismo , Macrófagos/metabolismo , Peroxidase , Placenta/citologia , Placenta/imunologia , Fator de Necrose Tumoral alfa/metabolismo
17.
J Infect Dis ; 179(3): 567-75, 1999 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-9952362

RESUMO

Pediatric AIDS Clinical Trials Group protocol 185 evaluated whether zidovudine combined with human immunodeficiency virus (HIV) hyperimmune immunoglobulin (HIVIG) infusions administered monthly during pregnancy and to the neonate at birth would significantly lower perinatal HIV transmission compared with treatment with zidovudine and intravenous immunoglobulin (IVIG) without HIV antibody. Subjects had baseline CD4 cell counts /=200/microL) but not with time of zidovudine initiation (5.6% vs. 4.8% if started before vs. during pregnancy; P=. 75). The Kaplan-Meier transmission rate for HIVIG recipients was 4. 1% (95% confidence interval, 1.5%-6.7%) and for IVIG recipients was 6.0% (2.8%-9.1%) (P=.36). The unexpectedly low transmission confirmed that zidovudine prophylaxis is highly effective, even for women with advanced HIV disease and prior zidovudine therapy, although it limited the study's ability to address whether passive immunization diminishes perinatal transmission.


Assuntos
Fármacos Anti-HIV/uso terapêutico , Anticorpos Anti-HIV/uso terapêutico , Infecções por HIV/prevenção & controle , Imunoglobulinas Intravenosas/uso terapêutico , Transmissão Vertical de Doenças Infecciosas/prevenção & controle , Complicações Infecciosas na Gravidez , Zidovudina/uso terapêutico , Adulto , Peso ao Nascer , Cesárea , Parto Obstétrico , Feminino , Idade Gestacional , Infecções por HIV/terapia , Infecções por HIV/transmissão , Humanos , Recém-Nascido , Recém-Nascido Prematuro , Gravidez , Resultado da Gravidez , Porto Rico , Estados Unidos
18.
Int J Paediatr Dent ; 9(3): 175-83, 1999 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-10815574

RESUMO

AIM: To investigate the relationship between morphology and position of double teeth, and the occurrence of other dental anomalies in the same subjects and in their siblings. SAMPLE OF CHILDREN AND METHODS: Fifty-three double teeth in a group of 50 Spanish children were included in the study. All of these children were examined clinically and had radiographs and photographs taken at the time of examination. Twenty-two of the children had a total of 30 siblings who were also examined for the presence of anomalies. RESULTS: Of the 50 subjects, 47 had one and three subjects had two double teeth. Statistically there were no significant differences in occurrence between boys and girls, left and right sides or between maxilla and mandible. Four morphological types were identified: type I, bifid crown-single root; type II, large crown-large root; type III, two fused crowns-single root; type IV, two fused crowns-two fused roots. Type I was seen only in the maxilla and types II and III only in the mandible. Type IV was seen mostly in the maxilla. More than half of the cases showed associated anomalies in the permanent dentition and anomalies of number or shape were also present in six of the siblings. CONCLUSION: It is suggested that both double teeth and other anomalies in the same children or in their siblings may be manifestations of a primary abnormality in the distribution of dental material.


Assuntos
Dentes Fusionados/epidemiologia , Dente Decíduo/anormalidades , Criança , Pré-Escolar , Cárie Dentária/complicações , Cárie Dentária/epidemiologia , Saúde da Família , Feminino , Dentes Fusionados/complicações , Dentes Fusionados/patologia , Humanos , Masculino , Prevalência , Estudos Retrospectivos , Espanha/epidemiologia , Dente Supranumerário/complicações , Dente Supranumerário/epidemiologia
19.
ASDC J Dent Child ; 65(5): 346-8, 356, 1998.
Artigo em Inglês | MEDLINE | ID: mdl-9795741

RESUMO

The different evolutions of a red discoloration of the primary maxillary central incisors in the same patient are charted. In the right central incisor the red discoloration disappeared; in the left it faded but was sustained until exfoliation. This case supports the theoretical existence of a transient type of discoloration following trauma. The resorption of posttraumatic intrapulpal bleeding in a primary tooth is discussed as a possible pathogenesis.


Assuntos
Incisivo/patologia , Descoloração de Dente/etiologia , Dente Decíduo/patologia , Pré-Escolar , Polpa Dentária/lesões , Feminino , Seguimentos , Humanos , Incisivo/lesões , Maxila , Esfoliação de Dente , Fraturas dos Dentes/complicações , Raiz Dentária/lesões , Dente Decíduo/lesões
20.
ASDC J Dent Child ; 65(2): 102-6, 1998.
Artigo em Inglês | MEDLINE | ID: mdl-9617449

RESUMO

The eruption cyst is a lesion associated with an erupting tooth. It appears as a transparent, bluish, blue or blue-black swelling of the alveolar mucosa, over a temporal or permanent tooth in eruption. The analysis of the thirty-six eruption cysts cases studied, corresponding to twenty-seven patients, revealed that their most frequent location is in the maxillary permanent dentition, and that they mostly occur in a single presentation, and in an age-range of between five and nine years. Six cases out of the twenty-seven patients studied showed the characteristic of presenting two or more eruption cysts, and in three of these cases, the lesions were bilateral, symmetrical and simultaneous. Two other patients had been previously diagnosed with cyst diseases. This would suggest that, in addition to the possible infection-trauma origin, there is in some cases the possibility of a predisponent tendency.


Assuntos
Cisto Dentígero/patologia , Erupção Dentária , Distribuição por Idade , Criança , Pré-Escolar , Cisto Dentígero/epidemiologia , Feminino , Humanos , Lactente , Masculino , Mandíbula , Maxila , Estudos Retrospectivos , Distribuição por Sexo , Espanha/epidemiologia
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