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Id: biblio-1152205
Autor: Gómez, Marcelo Matias Mederos; Garcia, Isadora Martini; Leitune, Vicente Castelo Branco; Collares, Fabrício Mezzomo.
Título: Surface and mechanical properties of adhesives with calcium phosphates challenged to different storage media
Fonte: Braz. j. oral sci;19:e200181, jan.-dez. 2020. ilus.
Idioma: en.
Resumo: Aim: To evaluate the behavior of experimental dental adhesives with hydroxyapatite (HAp), alpha-tricalcium phosphate (α-TCP) or octacalcium phosphate (OCP) after storing them in three different media: dry storage, distilled water, or lactic acid. Methods: An experimental adhesive resin was formulated with bisphenol A glycol dimethacrylate, 2-hydroxyethyl methacrylate, and photoiniciator/co-initiator system. HAp(GHAp), α-TCP (Gα-TCP), or OCP (GOCP) were added to the adhesive resin at 2 wt.%, and one group remained without calcium phosphates to be used as a control (GCtrl). The adhesives were evaluated for surface roughness, scanning electron microscopy (SEM), and ultimate tensile strength (UTS) after storing in distilled water (pH=5.8), lactic acid (pH=4) or dry medium. Results: The initial surface roughness was not different among groups (p>0.05). GHAp showed increased values after immersion in water (p<0.05) or lactic acid (p<0.05). SEM analysis showed a surface variation of the filled adhesives, mainly for Gα-TCP and GHAp. GHApshowed the highest UTS in dry medium (p<0.05), and its value decreased after lactic acid storage (p<0.05). Conclusions: The findings of this study showed that HAp, OCP, and α-TCP affected the physical behavior of the experimental adhesive resins in different ways. HAp was the calcium phosphate that most adversely affected the surface roughness and the mechanical property of the material, mainly when exposed to an acid medium
Descritores: Polímeros
Resistência à Tração
Ácidos
Fosfatos de Cálcio
Adesivos Dentinários
Responsável: BR218.1 - Biblioteca Carlos Henrique Robertson Liberalli


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Id: biblio-1141516
Autor: M. Nayif, Maan.
Título: Ultimate tensile strength of total and self-etch adhesives: effect of light irradiation distance
Fonte: J. oral res. (Impresa);8(supl.1):44-47, ago. 9, 2019. tab, graf.
Idioma: en.
Resumo: Objective: To evaluate the ultimate tensile strength (UTS) of total and self- etch adhesives irradiated at different distances. Materials and Methods: Sixty cylindrical specimens of 0.78mm diameter and 10 mm length were prepared of two types of adhesive systems total etch Excite DSC (EX ­ Ivoclar Vivadent, Schaan, Liechtenstein) and one-step self-etch Clearfil S3 Bond (S3, Kuraray Medical Inc., Tokyo, Japan). Specimens of each adhesive were divided into three groups according to the light irradiation distance (0, 2, 4mm) (n=10). Each specimen was attached to universal testing machine (Digital Force Gauge, IMADA CO., LTD, Japan) and loaded at cross head speed of 1mm/min until failure. Data were analyzed using two-way ANOVA and Independent Student t-test at p< 0.05. Results: Mean UTS for total etch (24.63, 18.19, 17.26 Mpa) and for self-etch (12.68, 8.53, 7.58Mpa) at (0, 2, 4mm) distances. Specimens irradiated directly show significantly the highest UTS while those irradiated at 4mm show the lowest values (p<0.05). Excite DSC total etch adhesive have higher UTS than Clearfil S3 self-etch adhesive regardless of irradiation distance (p<0.05).Conclusions: The UTS of the evaluated adhesives was light irradiation distance and adhesive system dependant.
Descritores: Resistência à Tração/efeitos da radiação
Colagem Dentária
Adesivos Dentinários
-Radiação
Cimentos Dentários
Análise do Estresse Dentário
Limites: Humanos
Responsável: CL30.1 - Biblioteca


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Id: biblio-1141327
Autor: Al-Ali, Ahmed Asim Saeed; Al-Noori, Ammar K; Taqa, Amer A.
Título: Tensile and transverse strength of novel copolymers for denture base
Fonte: J. oral res. (Impresa);8(supl.1):7-10, ago. 9, 2019. graf.
Idioma: en.
Resumo: Objectives: Compare tensile and transverse strength of new copolymers for denture base. Materials and methods: The specimens were prepared from heat cured acrylic resin with three types of additives: Acryester B, Ethoxycarbonylethylene, and Propenoic acid at a percentage of 5% and 10%. The tensile and transverse strains were tested, recorded and compared. Results: The analysis of variance display statistically significant difference. The p-value was 0.001 for each of tensile and transverse strain tests. Conclusions: The tensile strength of the novel copolymers increased. The transverse strength of some of the novel copolymers increased.
Descritores: Resinas Sintéticas/química
Resistência à Tração
Bases de Dentadura
-Polimetil Metacrilato
Limites: Humanos
Responsável: CL30.1 - Biblioteca


  4 / 1016 LILACS  
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Alonso, Roberta Caroline Bruschi
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Id: biblio-1019969
Autor: Paula, Andreia Bolzan de; Alonso, Roberta Caroline Bruschi; Taparelli, Jesus Roberto; Camassari, Jéssica Rodrigues; Innocentini-Mei, Lúcia Helena; Correr-Sobrinho, Lourenço; Puppin-Rontani, Regina M.
Título: Influence of the incorporation of triclosan methacrylate on the physical properties and antibacterial activity of resin composite
Fonte: J. appl. oral sci;27:e20180262, 2019. tab.
Idioma: en.
Projeto: FAPESP.
Resumo: Abstract The incorporation of antimicrobials in the composites as an attempt to reduce bacterial adhesion without jeopardizing mechanical properties is a challenge for Dentistry. Objective: To evaluate the bacterial adhesion and physical properties of a composite containing the methacrylate triclosan- derivative monomer (TM). Methodology: TM was synthesized and added to an experimental composite. Samples were divided into two groups: Control and TM (13.4 wt%). Antibacterial Activity: Three specimens of each material were prepared and placed on bacterial suspensions of Streptococcus mutans for 1, 5 and 10 days. After these periods the counting of the colonies (log10) was performed. Assays was performed in triplicate. Physical Properties: Three-body Abrasion (TBA): Ten specimens of each material were prepared and stored at 37°C/24 h. The surface roughness (Ra) and hardness (KHN) were analyzed. Next, the specimens were submitted to abrasive wear (30,000 cycles) and re-evaluated for Ra and KHN; Sorption/solubility (SS): cylindrical specimens (n=10) were prepared and weighted. The specimens were immersed in deionized water for 7 days at 37°C and then their weight was verified again. SS were calculated using accepted formulas; Diametral tensile strength (DTS): specimens (n=10) underwent test performed in an Instron universal testing machine at a crosshead speed of 1 mm/min. Data were submitted to appropriate statistical tests according to data distribution and assay (p<0.05). Results: Bacterial Adhesion: TM showed a significant reduction on biofilm accumulation in the evaluated periods: 1 day (1.537±0.146); 5 days (2.183±0.138) and 10 days (4.469±0.155) when compared with Control: 1 day (4.954±0.249); 5 days (5.498±0.257) and 10 days (6.306±0.287). Physical Properties: For TBA, SS and DTS no significant difference was found between groups Control and TM. The incorporation of methacrylate triclosan-based monomer in the experimental composite reduce bacterial adhesion of S. mutans and did not affect important polymer properties.
Descritores: Triclosan/química
Resinas Compostas/química
Metacrilatos/química
Antibacterianos/química
-Valores de Referência
Solubilidade
Streptococcus mutans/efeitos dos fármacos
Propriedades de Superfície
Resistência à Tração
Fatores de Tempo
Escovação Dentária
Triclosan/farmacologia
Aderência Bacteriana/efeitos dos fármacos
Teste de Materiais
Contagem de Colônia Microbiana
Reprodutibilidade dos Testes
Resinas Compostas/farmacologia
Testes de Dureza
Metacrilatos/farmacologia
Antibacterianos/farmacologia
Tipo de Publ: Estudo de Avaliação
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


  5 / 1016 LILACS  
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Texto completo SciELO Brasil
Amaral, Cristiane Mariote
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Id: biblio-1101251
Autor: MIRANDA, Maria Elisa da Silva Nunes Gomes; SILVA, Eduardo Moreira da; OLIVEIRA, Mariana Flôres de; SIMMER, Fabiana Souza; SANTOS, Glauco Botelho dos; AMARAL, Cristiane Mariote.
Título: Resin-dentin bond stability of etch-and-rinse adhesive systems with different concentrations of MMP inhibitor GM1489
Fonte: J. appl. oral sci;28:e20190499, 2020. tab, graf.
Idioma: en.
Projeto: CAPES.
Resumo: Abstract Enzymatic degradation of the hybrid layer can be accelerated by the activation of dentin metalloproteinases (MMP) during the bonding procedure. MMP inhibitors may be used to contain this process. Objective To evaluate the degree of conversion (DC%), dentin bond strength (µTBS) (immediate and after 1 year of storage in water), and nanoleakage of an experimental (EXP) and a commercial (SB) adhesive system, containing different concentrations of the MMP inhibitor GM1489: 0, 1 µM, 5 µM and 10 µM. Methodology DC% was evaluated by FT-IR spectroscopy. Dentin bond strength was evaluated by µTBS test. Half of beams were submitted to the µTBS test after 24 h and the other half, after storage for 1 year. From each tooth and storage time, 2 beams were reserved for nanoleakage testing. Data were analyzed using ANOVA and Tukey's test to compare means (α=0.05). Results All adhesive systems maintained the µTBS after 1 year of storage. Groups with higher concentrations of inhibitor (5 µM and 10 µM) showed higher µTBS values than groups without inhibitor or with 1 µM. The nanoleakage values of all groups showed no increase after 1 year of storage and values were similar for SB and EXP groups, in both storage periods. The inhibitor did not affect the DC% of the EXP groups, but the SB5 and SB10 groups showed higher DC% values than those of SB0 and SB1. Conclusions The incorporation of GM1489 in the adhesive systems had no detrimental effect on DC%. The concentrations of 5 µM GM1489 for SB and 5 µM or 10 µM for EXP provided higher μTBS than groups without GM1489, in the evaluation after 1 year of storage; whereas the concentration of inhibitor did not affect adhesive systems nanoleakage.
Descritores: Polietilenoglicóis/química
Ácidos Polimetacrílicos/química
Cimentos Dentários/química
Dentina/química
Inibidores de Metaloproteinases de Matriz/química
Metacrilatos/química
-Valores de Referência
Propriedades de Superfície
Resistência à Tração
Fatores de Tempo
Teste de Materiais
Reprodutibilidade dos Testes
Análise de Variância
Colagem Dentária/métodos
Espectroscopia de Infravermelho com Transformada de Fourier
Estatísticas não Paramétricas
Infiltração Dentária
Dentina/efeitos dos fármacos
Corrosão Dentária/métodos
Limites: Humanos
Tipo de Publ: Estudo de Avaliação
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


  6 / 1016 LILACS  
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Id: biblio-1101250
Autor: RODRIGUES, Monise de Paula; SOARES, Priscilla Barbosa Ferreira; GOMES, Márcio Alex Barros; PEREIRA, Renata Afonso; TANTBIROJN, Daranee; VERSLUIS, Antheunis; SOARES, Carlos Jose.
Título: Direct resin composite restoration of endodontically-treated permanent molars in adolescents: bite force and patient-specific finite element analysis
Fonte: J. appl. oral sci;28:e20190544, 2020. tab, graf.
Idioma: en.
Resumo: Abstract Objective To evaluate the influence of three levels of dental structure loss on stress distribution and bite load in root canal-treated young molar teeth that were filled with bulk-fill resin composite, using finite element analysis (FEA) to predict clinical failure. Methodology Three first mandibular molars with extensive caries lesions were selected in teenager patients. The habitual occlusion bite force was measured using gnathodynamometer before and after endodontic/restoration procedures. The recorded bite forces were used as input for patient-specific FEA models, generated from cone-beam computed tomographic (CT) scans of the teeth before and after treatment. Loads were simulated using the contact loading of the antagonist molars selected based on the CT scans and clinical evaluation. Pre and post treatment bite forces (N) in the 3 patients were 30.1/136.6, 34.3/133.4, and 47.9/124.1. Results Bite force increased 260% (from 36.7±11.6 to 131.9±17.8 N) after endodontic and direct restoration. Before endodontic intervention, the stress concentration was located in coronal tooth structure; after rehabilitation, the stresses were located in root dentin, regardless of the level of tooth structure loss. The bite force used on molar teeth after pulp removal during endodontic treatment resulted in high stress concentrations in weakened tooth areas and at the furcation. Conclusion Extensive caries negatively affected the bite force. After pulp removal and endodontic treatment, stress and strain concentrations were higher in the weakened dental structure. Root canal treatment associated with direct resin composite restorative procedure could restore the stress-strain conditions in permanent young molar teeth.
Descritores: Força de Mordida
Resinas Compostas/química
Dente não Vital/terapia
Restauração Dentária Permanente/métodos
Dente Molar
-Valores de Referência
Resistência à Tração
Reprodutibilidade dos Testes
Resultado do Tratamento
Resinas Compostas/uso terapêutico
Dente não Vital/diagnóstico por imagem
Força Compressiva
Análise de Elementos Finitos
Análise do Estresse Dentário
Tomografia Computadorizada de Feixe Cônico
Módulo de Elasticidade
Modelagem Computacional Específica para o Paciente
Limites: Humanos
Criança
Tipo de Publ: Estudo de Avaliação
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


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Id: biblio-1090787
Autor: YOSHIDA, Keiichi.
Título: Influence of alumina air-abrasion for highly translucent partially stabilized zirconia on flexural strength, surface properties, and bond strength of resin cement
Fonte: J. appl. oral sci;28:e20190371, 2020. tab, graf.
Idioma: en.
Resumo: Abstract Objective This study aims to evaluate the influence of different air-abrasion pressures and subsequent heat treatment on the flexural strength, surface roughness, and crystallographic phases of highly translucent partially stabilized zirconia (Y-PSZ), and on the tensile bond strength of resin cement to Y-PSZ. Methodology Fully sintered zirconia specimens were ground with SiC paper (control) and/or air-abraded with 50 µm particles of alumina at 0.1, 0.15, 0.2, or 0.3 MPa or left as-sintered. After air-abrasion at 0.2 MPa (0.2AB), additional specimens were then heated to 1500°C, and held for one hour at this temperature (0.2AB+HT1h). Flexural strength and surface roughness were evaluated. Crystalline phase identification was also carried out using X-ray diffraction. Bonded zirconia specimens with self-adhesive resin cement were stored in distilled water at 37°C for 24 h, either with or without aging (thermal cycling 4-60°C/20000). Results were analyzed statistically by ANOVA and Tukey-Kramer tests. Results The flexural strength decreased with the increase in air-abrasion pressure, while in contrast, the surface roughness increased. The lowest flexural strength and the highest roughness value were found for the 0.2AB and 0.3AB groups, respectively. All groups contained cubic-, tetragonal ( t )-, and rhombohedral ( r )-ZrO2 phases with the exception of the as-sintered group. Upon increasing the air-abrasion pressure, the relative amount of the r -ZrO2 phase increased, with a significant amount of r -ZrO2 phase being detected for the 0.2AB and 0.3AB groups. The 0.2AB+HT1h group exhibited a similar flexural strength and t -ZrO2 phase content as the as-sintered group. However, the 0.2AB group showed a significantly higher tensile bond strength (p<0.05) than the 0.2AB+HT1h group before and after aging. Conclusion Micromechanical retention by alumina air-abrasion at 0.2 MPa, in combination with chemical bonding of a resin to highly translucent Y-PSZ using a MDP-containing resin cement may enable durable bonding.
Descritores: Zircônio/química
Colagem Dentária/métodos
Cimentos de Resina/química
Abrasão Dental por Ar/métodos
Óxido de Alumínio/química
-Valores de Referência
Propriedades de Superfície
Resistência à Tração
Difração de Raios X/métodos
Teste de Materiais
Reprodutibilidade dos Testes
Análise de Variância
Microscopia Confocal/métodos
Resistência à Flexão
Temperatura Alta
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


  8 / 1016 LILACS  
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Texto completo
Id: biblio-1056595
Autor: YOSHIDA, Keiichi.
Título: Influence of alumina air-abrasion for highly translucent partially stabilized zirconia on flexural strength, surface properties, and bond strength of resin cement
Fonte: J. appl. oral sci;28:e20190371, 2020. tab, graf.
Idioma: en.
Resumo: Abstract Objective This study aims to evaluate the influence of different air-abrasion pressures and subsequent heat treatment on the flexural strength, surface roughness, and crystallographic phases of highly translucent partially stabilized zirconia (Y-PSZ), and on the tensile bond strength of resin cement to Y-PSZ. Methodology Fully sintered zirconia specimens were ground with SiC paper (control) and/or air-abraded with 50 µm particles of alumina at 0.1, 0.15, 0.2, or 0.3 MPa or left as-sintered. After air-abrasion at 0.2 MPa (0.2AB), additional specimens were then heated to 1500°C, and held for one hour at this temperature (0.2AB+HT1h). Flexural strength and surface roughness were evaluated. Crystalline phase identification was also carried out using X-ray diffraction. Bonded zirconia specimens with self-adhesive resin cement were stored in distilled water at 37°C for 24 h, either with or without aging (thermal cycling 4-60°C/20000). Results were analyzed statistically by ANOVA and Tukey-Kramer tests. Results The flexural strength decreased with the increase in air-abrasion pressure, while in contrast, the surface roughness increased. The lowest flexural strength and the highest roughness value were found for the 0.2AB and 0.3AB groups, respectively. All groups contained cubic-, tetragonal ( t )-, and rhombohedral ( r )-ZrO2 phases with the exception of the as-sintered group. Upon increasing the air-abrasion pressure, the relative amount of the r -ZrO2 phase increased, with a significant amount of r -ZrO2 phase being detected for the 0.2AB and 0.3AB groups. The 0.2AB+HT1h group exhibited a similar flexural strength and t -ZrO2 phase content as the as-sintered group. However, the 0.2AB group showed a significantly higher tensile bond strength (p<0.05) than the 0.2AB+HT1h group before and after aging. Conclusion Micromechanical retention by alumina air-abrasion at 0.2 MPa, in combination with chemical bonding of a resin to highly translucent Y-PSZ using a MDP-containing resin cement may enable durable bonding.
Descritores: Zircônio/química
Colagem Dentária/métodos
Cimentos de Resina/química
Abrasão Dental por Ar/métodos
Óxido de Alumínio/química
-Valores de Referência
Propriedades de Superfície
Resistência à Tração
Difração de Raios X/métodos
Teste de Materiais
Reprodutibilidade dos Testes
Análise de Variância
Microscopia Confocal/métodos
Resistência à Flexão
Temperatura Alta
Responsável: BR28.1 - Serviço de Biblioteca e Documentação Professor Doutor Antônio Gabriel Atta


  9 / 1016 LILACS  
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Id: lil-529293
Autor: Arrais, César Augusto Galvão; Urban, Vanessa Migliorini; Pontes, Fenelon Martinho Lima; Leite, Edson Roberto; Giannini, Marcelo.
Título: Influence of curing accelerator for cyanoacrylate glues on physical properties of adhesive resins
Fonte: RPG rev. pos-grad;13(1):7-12, jan.-mar. 2006. tab, graf.
Idioma: en.
Resumo: The objectives of this study were to evaluate the effect of a curing accelerator (CA) on the ultimate tensile strength (UTS) and degree of conversion (DC) of two adhesive systems, Single Bond and Clearfil SE Bond, as well as to identify the composition of the CA hour-glass adhesive resin samples with a cross sectional area of 0,8 mm² at the "neck" were tested in tension using a Universal Testing Machine. Fourier transform infrared spectroscopy (FTIR) was used to analyse thin films of each adhesive resin. All samples were stored in the dark for 24 hours before they were tested. During the UTS and FTIR analyses, the contact of the CA with samples was either avoided or not. The gas chromatography mass spectrocopy (GC-MS) and the nuclear magnetic resonance (NMR) analyses determined the molecular weight and structure of the CA. UTS and DC were analyzed by ANOVA and Tukey's test at 95% of confidence. The use of the CA did not affect the UST (p=0.5996) but increased the DC of the samples (p<0.0001). The compound identified by GC-MS and NMR was N-dimethyl p-toluidine. The application of CA in microtensile bond strength methodology raises concern regarding its effects on poorly polymerized adhesive systems.
Descritores: Adesivos Dentinários
Resistência à Tração
-Análise de Variância
Cromatografia Gasosa
Espectroscopia de Infravermelho com Transformada de Fourier
Tipo de Publ: Estudo de Avaliação
Responsável: BR501.1 - Biblioteca de Ciências da Saúde / Sede Botânico


  10 / 1016 LILACS  
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Bussadori, Sandra Kalil
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Id: lil-549717
Autor: Bachiega, Joanna Carolina; Martins, Manoela Domingues; Fernandes, Kristianne Porta Santos; Mesquita-Ferrari, Raquel Agnelli; Bussadori, Sandra Kalil.
Título: Avaliação in vitro da resistência adesiva de quatro cimentos resinosos em dentes decíduos / In vitro bond strength of four resin cements in primary teeth
Fonte: Pesqui. bras. odontopediatria clín. integr;10(1):35-39, jan.-abr. 2010.
Idioma: pt.
Resumo: Objetivo: Avaliar in vitro a resistência adesiva de quatro cimentos resinosos em dentes decíduos, por meio de ensaio de tração. Método: Foram utilizados 36 corpos de prova em molares decíduos incluídos em resina acrílica ativada quimicamente, com as faces de interesse voltadas para a matriz, todos preparados da mesma forma e divididos em 4 grupos aleatoriamente: Grupo 1: Adesivo Single Bond + Cimento Dual Cement, Grupo 2: Adesivo Single Bond+ Cimento Rely X, Grupo 3: Adesivo Single Bond + Cimento Rely X Luting Cement, Grupo 4: Adesivo proposto pelo fabricante+ Resina Concise fluidificada. Após teste de tração, os dados encontrados foram submeti dos à Análise de Variância para fatores fixos para verificar se houveram diferenças significativas entre as faces e entre os grupos. Verificou-se a homogeneidade das variâncias por meio do teste de Levene. Foi feito também o teste para a normalidade dos resíduos (teste de Anderson-Darling) e para avaliar melhor a diferença entre os grupos fez-se comparações múltiplas pelo método Tukey. Resultados: O Grupo 2 foi o que apresentou a maior média e também maior variabilidade, os Grupos 3 e 4 apresentaram médias próximas e o Grupo 1 foi o que apresentou menor variabilidade. O Grupo 2 apresentou maior resistência quando comparado aos demais, seguido pelo Grupo 1. Já os Grupos 3 e 4 apresentaram resistência semelhante porém inferiores aos Grupos 1 e 2. Conclusão: Houve apenas diferença na média das resistências encontradas, que foi superior no Grupo 2.

Objective: To evaluate in vitro the tensile bond strength of four resin cements in primary teeth. Method: Thirty-six primary molars were selected and embedded in chemically activated acrylic resin with the test surfaces turned to the matrix. All specimens were prepared in the same way and were randomly assigned to 4 groups: Group 1: Single Bond adhesive system + Dual Cement, Group 2: Single Bond adhesive system + Rely X, Group 3: Single Bond adhesive system + Rely X Luting Cement, Group 4: Adhesive system proposed by the manufacturer + flowable Concise resin. The bond strength data were subjected to analysis of variance to verify the occurrence of significant differences among the surfaces and among the groups. The homogeneity of the variances was demonstrated by the Levene test. The Anderson-Darling test was used to analyze the normality of residues and the Tukey's multi ple-comparison test was used to evaluate the differences among the groups. Results: Group 2 presented the highest mean and the highest variability. Groups 3 and 4 presented close means and Group 1 presented the lowest variability. Group 2 presented the highest bond strength followed by Group 1. Groups 3 and 4 presented similar bond strengths and significantly lower than those of Groups 1 and 2. Conclusion: There was difference only for the mean bond strength, which was higher in Group 2.
Descritores: Cimentos Dentários
Cimentos de Resina
Dente Decíduo
Técnicas In Vitro
Materiais Dentários
Odontopediatria
Resinas Acrílicas
Resistência à Tração
-Análise de Variância
Tipo de Publ: Estudo de Avaliação
Responsável: BR1264.1 - Biblioteca Setorial Prof Alberto M Campos



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