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Search Results: 1 - 10 of 36480 matches for " Roberta Caroline Bruschi;Santos "
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Comparative study of the surface roughness of Ormocer-based and conventional composites
Cunha, Leonardo Gon?alves;Alonso, Roberta Caroline Bruschi;Santos, Paulo Henrique dos;Sinhoreti, Mário Alexandre Coelho;
Journal of Applied Oral Science , 2003, DOI: 10.1590/S1678-77572003000400014
Abstract: the aim of this study was to evaluate the surface roughness of two ormocer-based resin composites before and after mechanical toothbrushing. the study compared the brands admira and definite with composites based on conventional monomer systems (bis-gma, bis-ema, uedma e tegdma), z250 and a110. eight samples of each material with 4mm in diameter and 2mm in height were prepared using a metallic mold. after 24 hours they were polished and examined with a profilometer for measurement of the initial surface roughness (ra, mm) before mechanical toothbrushing (30,000 cycles). after toothbrushing, the samples were taken to the profilometer once again to check the final surface roughness. the results were submitted to anova and tukey test (5%). the admira composite presented a higher mean of surface roughness before toothbrushing (0.132mm), with a statistical difference from the composite a110 (0.082mm). definite (0.110mm) and z250 (0.105mm) composites showed no differences between themselves or among the other composites. no statistical differences were observed after toothbrushing between the composites definite (0.178mm), z250 (0.187mm), admira (0.181mm), and a110 (0.193mm). all composites showed a statistically significant increase in the surface roughness after toothbrushing.
Impact of adhesive and photoactivation method on sealant integrity and polymer network formation
Borges, Boniek Castillo Dutra;Pereira, Fabrício Lopes da Rocha;Alonso, Roberta Caroline Bruschi;Braz, Rodivan;Montes, Marcos Ant?nio Japiassú Resende;Pinheiro, Isauremi Vieira de Assun??o;Santos, Alex José Souza dos;
Brazilian Oral Research , 2012, DOI: 10.1590/S1806-83242012000300011
Abstract: we evaluated the influence of photoactivation method and hydrophobic resin (hr) application on the marginal and internal adaptation, hardness (khn), and crosslink density (cld) of a resin-based fissure sealant. model fissures were created in bovine enamel fragments (n = 10) and sealed using one of the following protocols: no adhesive system + photoactivation of the sealant using continuous light (cl), no adhesive system + photoactivation of the sealant using the soft-start method (ss), hr + cl, or hr + ss. marginal and internal gaps and khn were assessed after storage in water for 24 h. the cld was indirectly assessed by repeating the khn measurement after 24 h of immersion in 100% ethanol. there was no difference among the samples with regard to marginal or internal adaptation. the khn and cld were similar for samples cured using either photoactivation method. use of a hydrophobic resin prior to placement of fissure sealants and curing the sealant using the soft-start method may not provide any positive influence on integrity or crosslink density.
Effect of resin liners on the microleakage of class V dental composite restorations
Alonso, Roberta Caroline Bruschi;Sinhoreti, Mário Alexandre Coelho;Correr Sobrinho, Louren?o;Consani, Simonides;Goes, Mario Fernando de;
Journal of Applied Oral Science , 2004, DOI: 10.1590/S1678-77572004000100011
Abstract: purpose: the aim of this study was to evaluate the effect of an adhesive applied in layers of different thickness or in association with a filled adhesive or with a low viscosity composite liner on the microleakage of composite restorations. methods: forty bovine incisors were prepared with round cavities (4mm diameter x 2mm depth) on the cementoenamel junction. the teeth were assigned to four groups according to the liner used: 1 (control) - application of 1 layer of the scotchbond multi purpose adhesive system (sbmp); 2 - application of 3 layers of sbmp; 3 - application of 1 layer of sbmp followed by application of one layer of optibond fl adhesive; 4 - application of one layer of sbmp followed by application of flowable composite flow-it. all cavities were restored using composite resin z100. the microleakage test was conducted according to iso (tr11405). data were analyzed by kruskall-wallis test (a=0.05). results: group 4 showed less leakage than group 1. groups 2 and 3 showed intermediate values and there were no statistical differences when they were compared to the values of groups 1 and 4 conclusion: the use of resin liners with flowable composites can reduce the microleakage of composite restorations.
Reattachment of an autogenous tooth fragment – 36-month follow-up: fast and safe rehabilitation of fractured teeth
Roberta Caroline Bruschi ALONSO,Anna Maria Cia PAPA,Maria Graziela Santoro Caldari CASTELETI,Patrícia Almada SACRAMENTO
Perspectives in Oral Sciences , 2009,
Abstract: Traumatic injuries in the permanent teeth of children and adolescents are one of the most frequent causes of dental treatment. The aim of the study was to present the clinical procedures and 36 months follow-up for treatment of fractured maxillary central incisor. The fracture was restricted to enamel and dentin tissues, without root fracture or pulpal exposure. In this case, a simple reattachment technique was performed using a total etch adhesive systems without additional preparation. A resin composite was used to fill the discontinuity between the fragment and the dental remnant in palatal side. The clinical procedure can be considered safe and simple; therefore the less time in chair is required, which reduces the cost of the treatment. Examination 36 months after treatment revealed good esthetics, normal function and no signsor symptoms of pulpal inflammation or necrosis. The reattachment of fragment in fractured tooth is conservative technique that can reestablish the original esthetic appearance of the tooth. Thistechnique is fast and efficient, providing satisfactory results in long term. Considering that, the fragment reattachment should be the first choice for treatment of uncomplicated anterior crown fractures if the tooth is not luxated and the fragment is available and properly stored.
Influence of environmental conditions on properties of ionomeric and resin sealant materials
Kantovitz, Kamila Rosamilia;Pascon, Fernanda Miori;Correr, Gisele Maria;Alonso, Roberta Caroline Bruschi;Rodrigues, Lidiany Karla Azevedo;Alves, Marcelo Correa;Puppin-Rontani, Regina Maria;
Journal of Applied Oral Science , 2009, DOI: 10.1590/S1678-77572009000400006
Abstract: objectives: the aim of this study was to determine the effect of environmental conditions on the degradation of ionomeric and resin sealant materials. material and methods: fluroshield, vitremer, and ketac molar disc-shaped specimens (n=18/material) were prepared, polished, subjected to initial hardness and roughness readings. six discs of each material were randomly assigned to one of three different storage solutions: 0.3% citric acid (ca), demineralization solution (de), and remineralization solution (re). the specimens were individually immersed in 3 ml of the test solutions, which were daily changed. after 15 days of storage, new surface roughness and hardness readings were done. fluoride release in the solutions was measured within 15 days. data were analyzed by anova and tukey's and contrast tests (α=0.05). results: the storage in ca increased the roughness of vitremer and ketac molar. a significant reduction in hardness was observed for all materials after storage in all solutions. for all materials, the greatest amounts of fluoride release occurred during the 1st day. fluroshield presented the same patterns of fluoride release in all solutions. ketac molar and vitremer released the highest amounts of fluoride in the ca solution. conclusions: ionomeric materials are more susceptible to degradation than resin-based materials under acidic conditions. acidic conditions lead to a higher fluoride release from ionomeric materials.
Effect of saliva contamination and re-etching time on the shear bond strength of a pit and fissure sealant
Correr, Gisele Maria;Caldo-Teixeira, Angela S.;Alonso, Roberta Caroline Bruschi;Puppin-Rontani, Regina Maria;Sinhoreti, Mário Alexandre Coelho;Correr-Sobrinho, Louren?o;
Journal of Applied Oral Science , 2004, DOI: 10.1590/S1678-77572004000300007
Abstract: the aim of this study was to evaluate the effect of saliva contamination (sct) and re-etching time (ret) on the shear bond strength (sbs) of the fluroshield sealant. forty-five extracted third molars were sectioned and flattened until reach an enamel surface area. then, all samples were etched for 30 sec with 35% phosphoric acid and then they were distributed into 9 groups (n=10) according to sct and ret (seconds), respectively: g1- control (no sct and no ret); g2- 30s and 0s; g3- 60s and 0s; g4-30s and 2s; g5- 30s and 5s; g6- 30s and 15s; g7-60s and 2s; g8- 60s and 5s; g9- 60s and 15s. the sealant was applied according to the manufacturer's instructions. the samples were stored in distilled water at 37oc for 72h and subjected to the sbs test. the results indicated that there was no statistically significant difference between the groups (p>0.05). however, it could be noticed that: 1- the longer the sct, the lower the sbs values; 2 - the longer the ret, the higher the sbs values. it could be concluded that there was a tendency to the shortest sct (30s) associated to the longest ret (5 and 15s) to reach similar sbs values for the control group.
Hydrolytic degradation of a resin composite as a function of the curing tip distance and aging
Svizero, Nádia da Rocha;Carvalho, Vanessa de Freitas;Bechtold, Janaina;Alonso, Roberta Caroline Bruschi;Atta, Maria Teresa;D'Alpino, Paulo Henrique Perlatti;
Materials Research , 2011, DOI: 10.1590/S1516-14392011005000084
Abstract: the influence of curing tip distance and storage time on the hardness of a composite was evaluated. composite samples (filtek z250) were polymerized at different distances (5, 10, and 15 mm), compared with a control group (0 mm), and stored in distilled water at 37 ° c for 24 hours. the knoop-hardness of top and bottom surfaces was assessed (25 g/30 s). specimens were stored in distilled water for 6 and 12 months and were retested. hardness was found to be negatively influenced by both curing tip distance and storage time. despite similar values at 24 hours, differences in hardness values compared with the control group appeared over time. in comparing both surfaces, hardness proved to be greater at the top surface for all groups. composites with similar initial hardness values can degrade very differently after water storage. the higher the photoactivation distance and storage time, the worse the mechanical property.
Kinetic of water diffusion and color stability of a resin composite as a function of the curing tip distance
Svizero, Nádia da Rocha;Alonso, Roberta Caroline Bruschi;Wang, Linda;Palma-Dibb, Regina Guenka;Atta, Maria Teresa;D'Alpino, Paulo Henrique Perlatti;
Materials Research , 2012, DOI: 10.1590/S1516-14392012005000070
Abstract: the influence of curing tip distance and storage time in the kinetics of water diffusion (water sorption-wsp, solubility-wsb, and net water uptake) and color stability of a composite were evaluated. composite samples were polymerized at different distances (5, 10, and 15 mm) and compared to a control group (0 mm). after desiccation, the specimens were stored in distilled water to evaluate the water diffusion over a 120-day period. net water uptake was calculated (sum of wsp and wsb). the color stability after immersion in a grape juice was compared to distilled water. data were submitted to three-way anova/tukey's test (α = 5%). the higher distances caused higher net water uptake (p < 0.05). the immersion in the juice caused significantly higher color change as a function of curing tip distance and the time (p < 0.05). the distance of photoactivation and storage time provide the color alteration and increased net water uptake of the resin composite tested.
Microtensile bond strength test and failure analysis to assess bonding characteristics of different adhesion approaches to ground versus unground enamel
Hipólito, Vinicius Di;Alonso, Roberta Caroline Bruschi;Carrilho, Marcela Rocha de Oliveira;Anauate Netto, Camillo;Sinhoreti, Mário Alexandre Coelho;Goes, Mario Fernando de;
Brazilian Dental Journal , 2011, DOI: 10.1590/S0103-64402011000200006
Abstract: this study evaluated the bonding characteristics to ground and unground enamel obtained with different strategies. for this purpose, 24 sound third-molars were bisected mesiodistally to obtain tooth halves. a flat enamel area was delimited in the tooth sections, which were randomly distributed into 8 groups (n=6), according to the enamel condition (ground and unground) and adhesive system (adper single bond 2 - sb2; adper prompt l-pop - plp; adper prompt - ad; clearfil se bond - se). each system was applied according manufacturers' instructions and a 6-mm-high resin composite "crown" was incrementally built up on bonded surfaces. hourglass-shaped specimens with 0.8 mm2 cross-section were produced. microtensile bond strength (μtbs) was recorded and the failure patterns were classified. results were analyzed by two-way anova and tukey's test (α=0.05). there were no statistically significant differences among the μtbs values of sb2, plp and ad (p>0.05). se values were significantly lower (p0.05). there was prevalence of cohesive failure within enamel, adhesive system and resin composite for sb2. the self-etch systems produced higher incidence of cohesive failures in the adhesive system. enamel condition did not determine significant differences on bonding characteristics for the same bonding system. in conclusion, the bonding systems evaluated in this study resulted in specific μtbs and failure patterns due to the particular interaction with enamel.
Daniela Giareta Durante,Caroline de Fátima Matiello Vaz,Roberta Bertoletti,Maria Elisabete Mariano dos Santos
Revista de Gest?o e Secretariado , 2011,
Abstract: This study aims at presenting the investigation conducted towards the performance of the egresses of the Executive Secretary Course from University of Passo Fundo, whose objective is to verify the performance and professional growth of these subjects, bearing in mind the necessity of the Course to focus its student’s education in consonance with the demands of the labor market. Also, trying to highlight the importance of the scientific demarcation in the secretarial field, objecting the consolidation of the professional identity, this study discusses the evolution of the area and points out the way it is connected with the Advisory Sciences. The investigation, involving 122 executive secretaries, is classified as bibliographic, documental and data collection. The questionnaire was the main instrument to collect the data and the analysis was done from the codification of the answers and the tabulation of the data so it was possible to relate it with the established theory. This study has revealed the importance of the real understanding of the secretarial area, making it possible to consolidate the so desired professional identity. Besides, it was found that the Executive Secretary Course from UPF provides its egresses the satisfactory qualification to meet the needs of the organizations, guaranteeing the factors of employability and professional growth. The study reinforces the promotion of actions in order to broaden the recognition of the profession considering not only the executive secretaries’ assignments but also the financial recognition. O presente estudo visa apresentar a investiga o conduzida acerca da atua o dos egressos do Secretariado Executivo da Universidade de Passo Fundo, objetivando verificar a atua o e ascens o profissional destes sujeitos, tendo em vista a necessidade de o próprio Curso direcionar a forma o de seus alunos em consonancia com as demandas do mercado de trabalho. Também, buscando frisar a importancia da demarca o científica no campo secretarial, com vistas à consolida o da identidade profissional, este trabalho discorre sobre a evolu o da área e como está relacionada com as Ciências da Assessoria. A pesquisa, envolvendo 122 secretários executivos, classifica-se como bibliográfica, documental e levantamento. O questionário foi o principal instrumento de coleta de dados e a análise foi feita a partir da codifica o das respostas e tabula o dos dados para ent o relacioná-los com o quadro teórico. O estudo revelou a importancia da clareza do que se trata a área secretarial, possibilitando a consolida o da t o almeja
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