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Search Results: 1 - 10 of 68087 matches for " Salete Moura Bonifácio da;Machado "
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INFILTRA??O MARGINAL DE CIMENTOS IONOMéRICOS MODIFICADOS POR RESINA
CARRARA, Carlos Eduardo;ABDO, Ruy Cesar Camargo;MACHADO, Maria Aparecida de Andrade Moreira;SILVA, Salete Moura Bonifácio da;
Revista de Odontologia da Universidade de S?o Paulo , 1997, DOI: 10.1590/S0103-06631997000200002
Abstract: the microleakage behavior of two hybrid glass ionomer cements used as restorative materials (variglass/caulk dentsply and vitremer/3m) was compared. separate class ii cavities were prepared on the mesial and distal aspects of thirteen extracted premolars. one restoration of each material was placed on every tooth. the cervical margins of the restorations were left one millimeter below the cementoenamel junction. thermocycling was conduced in a 0.5% basic fuchsin solution. the teeth were washed and sectioned for microleakage analysis under a dissecting microscope. none of the materials tested were able to inhibit dye penetration at the cervical margin. vitremer/3m was more effective than variglass/caulk dentsply in reducing microleakage.
INFILTRA O MARGINAL DE CIMENTOS IONOMéRICOS MODIFICADOS POR RESINA
CARRARA Carlos Eduardo,ABDO Ruy Cesar Camargo,MACHADO Maria Aparecida de Andrade Moreira,SILVA Salete Moura Bonifácio da
Revista de Odontologia da Universidade de S?o Paulo , 1997,
Abstract: Comparou-se a infiltra o marginal de dois cimentos restauradores que liberam flúor, o Vitremer/3M e o Variglass/Caulk Dentsply. Cavidades classe II foram confeccionadas nas faces mesiais e distais de pré-molares extraídos. Cada dente recebeu uma restaura o de cada material. Procedeu-se, ent o, a termociclagem em solu o de fucsina básica a 0,5%. Nenhum material foi capaz de evitar a infiltra o marginal, porém, esta foi menor nas restaura es de Vitremer/3M (p<0,01).
Airpolishing effect on bovine enamel and the posterior remineralizing effect of saliva: estudo in vitro
Ribeiro, Helena Zaramella Vono;Lima, José Eduardo de Oliveira;Vono, Bernardo Gonzalez;Machado, Maria Aparcida de Andrade Moreira;Silva, Salete Moura Bonifácio da;
Journal of Applied Oral Science , 2006, DOI: 10.1590/S1678-77572006000300009
Abstract: purpose: the aim of the present study was to evaluate the alterations of surface microhardness and wear caused by the sodium bicarbonate jet on bovine enamel and the further remineralizing effect of artificial saliva. methods: fifteen enamel samples (4,0mm x 4,0mm) were used, which constituted the groups: no treatment (mi); treatment with sodium bicarbonate jet (mii and di); treatment with sodium bicarbonate jet and immersion in saliva for one hour (miii and dii), 24 hours (miv and diii) and 7 days (mv and div). microhardness tests were carried out using a microdurometer in groups m and wear tests by a rugosimeter in groups d. the data were assessed by the one criterion variance analysis and tukey test. results: the mean value of microhardness, in khn, in groups mi, mii, miii, miv and mv were 359,80; 335,46; 369,20; 377,73 and 341,86, respectively, whereas the mean values in μm, of wear for group di, dii, diii and div were 0,564; 0,519; 0,441 and 0,428, respectively. conclusions: the sodium bicarbonate jet caused a wear and a reduction in microhardness on the enamel surface; saliva promoted the recovery of initial condition surface microhardness and reduced the wear; the repairing effect of saliva on the surface microhardness alterations occurred within one hour of treatment, having no significant statistical difference from the effect obtained in 24 hours; the best saliva repairing effect on the wear occurred with treatment of 24 hours.
Urgency treatment profile of 0 to 15 year-old children assisted at urgency dental service from Bauru Dental School, University of S?o Paulo
Sakai, Vivien Thiemy;Magalh?es, Ana Carolina;Pessan, Juliano Pelim;Silva, Salete Moura Bonifácio da;Machado, Maria Aparecida de Andrade Moreira;
Journal of Applied Oral Science , 2005, DOI: 10.1590/S1678-77572005000400005
Abstract: dental recordings of 0 to 15-year-old patients assisted at urgency dental service (uds) from bauru dental school, university of s?o paulo, in 2001 and 2002, were assessed in order to quantify the number of patients that used the service, to determine attendance patterns, and to record the frequency of different types of dental emergencies and their performed treatment. data were plotted and submitted to a descriptive statistical analysis. among the total of patients attended at uds (6020), 1166 (19.37%) were children, with mean age of 9.24 years. trauma was the cause for 199 (17.06%) of the recorded urgency visits. it occurred more frequently in children between 0 and 3 years of age (34.42%), and between 7 and 12 years of age (18.12%). the main treatments performed were temporary restoration (33.33%) for coronal fracture, and orientation (24.44%) for luxation. nontraumatic events were the etiology for 967 (82.92%) of the total urgency diagnosis. the most commonly found nontraumatic diagnosis was dental caries lesions (61.75%), followed by problems of eruption or root resorption (14.27%) and bone or soft tissue lesions (6.51%), among others (17.47%). the most frequent treatments performed for caries lesions were: excavation and temporary restoration (39.39%) when there was no abscess, and coronal opening and dressing (40.95%) for caries lesions with abscess. there was an increasing trend in caries lesions prevalence according to the rising of the age, in contrast to trauma prevalence. treatment for both situations was done according to the indicated protocol for each case.
Evaluation of marginal microleakage and depth of penetration of glass ionomer cements used as occlusal sealants
Fracasso, Marina de Lourdes Calvo;Rios, Daniela;Machado, Maria Aparecida Andrade Moreira;Silva, Salete Moura Bonifácio da;Abdo, Ruy César Camargo;
Journal of Applied Oral Science , 2005, DOI: 10.1590/S1678-77572005000300013
Abstract: objetive: the aim of this study was to conduct an in vitro comparison of marginal microleakage (mm) and the depth of penetration (dp) of glass ionomer cements (gic) and a resin sealant (rs) into occlusal pit and fissures. methods: for that purpose, 60 intact third molars were equally distributed to 5 groups: g1 - 37% phosphoric acid / delton; g2 - 40% polyacrylic acid / ketac-molar / nail varnish; g3 - fuji plus conditioner / fuji plus/ nail varnish; g4 -37% phosphoric acid / vitremer / finishing gloss; g5 -37% phosphoric acid / vitremer prepared with a 1:4 ratio of powder / finishing gloss. the teeth were submitted to a thermal treatment corresponding to 300 cycles (15 sec, 5/550c), followed by complete coating with nail varnish, except for 1mm beyond the contour of the sealant. afterwards, the teeth were immersed in 0.5% basic fuchsine for 24 hours. thereafter, the teeth were sectioned in buccolingual direction and microscopically analyzed (150x magnification) by means of predetermined scores. the results were subject to the kruskal-wallis test. results: there was no statistical difference between the materials tested in relation to the dp, being that all groups displayed nearly complete filling of the fissures. no sealant material was able to prevent dye penetration; however, the gics provided better results of mm, with significant difference when compared to the rs. conclusion: all materials investigated presented a satisfactory degree of penetration into the fissures; however, the glass ionomer cements displayed better performance in the marginal microleakage test compared to the resin sealant.
Effect of professional cleaning and dental brushing with or without fluoridated dentifrice on enamel remineralization
Marta, Sara Nader;Lima, José Eduardo de Oliveira;Vono, Bernardo Gonzales;Silva, Salete Moura Bonifácio da;Machado, Maria Aparecida Andrade Moreira;Pin, Maria Ligia Gerdullo;
Journal of Applied Oral Science , 2005, DOI: 10.1590/S1678-77572005000300004
Abstract: an in situ evaluation of the potential rehardening effect of fluoridated and non-fluoridated toothpastes with or without air polishing was conducted. ten volunteers, using acrylic palatal appliances containing two bovine enamel blocks with artificial carious lesions, took part in this study. four times a day, after the main meals and at night, the volunteers, in a habitual way, brushed their natural teeth with the dentifrice indicated to the experimental design and after that the appliances were put again into the mouth. they were divided into 4 different groups: g1 - control - non-fluoridated dentifrice; g2 - fluoridated dentifrice; g3 - non-fluoridated dentifrice, but having a previous prophylaxis using air polishing; g4 - fluoridated dentifrice and previous air polishing. the effects of treatments on enamel rehardening were evaluated in the blocks that were assessed by surface microhardness, and the percentage of surface microhardness change (%reh) was calculated in relation to the baseline values. the results showed that %reh was higher in the groups with fluoridated dentifrice, and professional prophylaxis did not have an additional effect in the groups of fluoridated dentifrices (p<0.05). the data suggested that, in the absence of fluoride, removal of dental plaque helped to increase the process of enamel rehardening.
Evaluation of glass ionomer sealants placed according to the ART approach in a community with high caries experience: 1-year follow-up
Vieira, Ana Luiza Falavinha;Zanella, Nildiceli Leite Melo;Bresciani, Eduardo;Barata, Terezinha de Jesus Esteves;Silva, Salete Moura Bonifácio da;Machado, Maria Aparecida de Andrade Moreira;Navarro, Maria Fidela de Lima;
Journal of Applied Oral Science , 2006, DOI: 10.1590/S1678-77572006000400011
Abstract: the aim of this study was to investigate the retention rates and effect on occlusal caries incidence of two glass ionomers used as sealants, placed according to the atraumatic restorative treatment (art) approach, in a high caries-risk community. a total of 150 newly erupted first molars of 42 schoolchildren, between 6-8 years of age were selected. the teeth were divided into two groups: experimental and control groups. in the experimental group, 76 teeth were sealed using vidrion r-ss white (conventional gic) and in the control group, 74 teeth were sealed using chemflex-dentsply (high-viscosity conventional gic). the sealants were applied by one operator following the "press finger technique", described in the art-who manual. two calibrated independent examiners carried out the evaluation according to the art criteria. the intra and inter-examiner agreements were 0.84 and 0.81, respectively. data were submitted to mann-whitney and chi-square tests (p<0.05). at the 1-year follow-up, 136 (90.7%) sealants were evaluated. in the control group: 28 (41.8%) of the sealants were partially or completely retained, 38 (56.7%) completely lost, and 1 (1.5%) was replaced by another treatment. in the experimental group, 30 (43.5%) of the sealants were partially or completely retained, 38 (55.1%) were clinically scored as complete loss and 1 (1.4%) were replaced by another treatment. seven sealants in both groups were not evaluated. secondary caries was not observed in both groups. there was no statistically significant difference between the retention (p=0.49) and effect on caries incidence rates for both groups (p=0.84). the clinical performance of the glass ionomer sealants of both groups was considered satisfactory with a high success rate (98.5%). although the sealants placed according to the art approach showed retention rates lower than 50% after 1 year in newly erupted first molars, this approach seems to be appropriate for communities with high caries experience.
Scanning electron microscopic study of the in situ effect of salivary stimulation on erosion and abrasion in human and bovine enamel
Rios, Daniela;Honório, Heitor Marques;Magalh?es, Ana Carolina;Silva, Salete Moura Bonifácio da;Delbem, Alberto Carlos Botazzo;Machado, Maria Aparecida de Andrade Moreira;Buzalaf, Marília Afonso Rabelo;
Brazilian Oral Research , 2008, DOI: 10.1590/S1806-83242008000200007
Abstract: this in situ study investigated, using scanning electron microscopy, the effect of stimulated saliva on the enamel surface of bovine and human substrates submitted to erosion followed by brushing abrasion immediately or after one hour. during 2 experimental 7-day crossover phases, 9 previously selected volunteers wore intraoral palatal devices, with 12 enamel specimens (6 human and 6 bovine). in the first phase, the volunteers immersed the device for 5 minutes in 150 ml of a cola drink, 4 times a day (8h00, 12h00, 16h00 and 20h00). immediately after the immersions, no treatment was performed in 4 specimens (ero), 4 other specimens were immediately brushed (0 min) using a fluoride dentifrice and the device was replaced into the mouth. after 60 min, the other 4 specimens were brushed. in the second phase, the procedures were repeated but, after the immersions, the volunteers stimulated the salivary flow rate by chewing a sugar-free gum for 30 min. enamel superficial alterations of all specimens were then evaluated using a scanning electron microscope. enamel prism core dissolution was seen on the surfaces submitted to erosion, while on those submitted to erosion and to abrasion (both at 0 and 60 min) a more homogeneous enamel surface was observed, probably due to the removal of the altered superficial prism layer. for all the other variables - enamel substrate and salivary stimulation -, the microscopic pattern of the enamel specimens was similar.
Influence of toothbrushing on enamel softening and abrasive wear of eroded bovine enamel: an in situ study
Rios, Daniela;Honório, Heitor Marques;Magalh?es, Ana Carolina;Buzalaf, Marília Afonso Rabelo;Palma-Dibb, Regina Guenka;Machado, Maria Aparecida de Andrade Moreira;Silva, Salete Moura Bonifácio da;
Brazilian Oral Research , 2006, DOI: 10.1590/S1806-83242006000200011
Abstract: this study assessed the surface softening and abrasive wear of eroded bovine enamel with or without the influence of toothbrushing. five volunteers took part in this in situ study of 5 days. they wore acrylic palatal appliances containing 6 bovine enamel blocks divided in two rows with 3 blocks, which corresponded to the studied groups: erosion without toothbrushing (gi) and erosion with toothbrushing (gii). the blocks were subjected to erosion by immersion of the appliances in a cola drink for 10 minutes, 4 times a day. after that, no treatment was performed in one row (gi), whereas the other row was brushed (gii). the appliance was then replaced into the mouth. enamel alterations were determined using profilometry and microhardness tests. data were tested using paired student?s t test (p < 0.05). the mean wear values (μm) and percentage of superficial microhardness change (%smhc) were respectively: gi - 2.77 ± 1.21/91.61 ± 3.68 and gii - 3.80 ± 0.91/58.77 ± 11.47. there was a significant difference in wear (p = 0.001) and %smhc (p = 0.001) between the groups. it was concluded that the wear was more pronounced when associated to toothbrushing abrasion. however, toothbrushing promoted less %smhc due to the removal of the altered superficial enamel layer.
In vitro evaluation of the marginal microleakage of amalgam restorations associated with dentin adhesive, glass ionomer cement and cavity varnish by means of different evaluation methods
Hoshi, Adriano Tomio;Silva, Salete Moura Bonifácio da;Pavarini, Aymar;
Journal of Applied Oral Science , 2005, DOI: 10.1590/S1678-77572005000100003
Abstract: this in vitro study evaluated the marginal microleakage of amalgam restorations associated with the cavity varnish copalite - cooley & cooley (gi-cp), dentin adhesive optibond solo - kerr (gii-os) and the glass ionomer cement vitremer - 3m (giii-vt). forty-five premolars were employed, which were submitted to independent class ii preparations at the mesial and distal aspects comprising the marginal ridges and were restored with dispersalloy - dentsply. afterwards, the teeth were thermocycled and stored in 0.5% basic fuchsine for 24 hours. the evaluations were conducted on a light microscope with 150x magnification and on the sigma scan software with employment of a single line and segmented lines. data analysis allowed to establish that none of the materials was able to eliminate the marginal microleakage, having the gi - cp presented greater and statistically significant values in relation to the other groups in all evaluation methods (p<0.05). the lowest values were displayed by the giii-vt, yet with no statistically significant difference when compared to gii-os, except for the evaluation at the sigma scan in single line. the three evaluation methods showed a strong positive relationship to each other.
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