Paula Mathias
Federal University of Bahia
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Featured researches published by Paula Mathias.
Journal of Applied Oral Science | 2010
Avilmar Passos Galvão; Letícia Borges Jacques; Luciana Dantas; Paula Mathias; André Mallmann
Objectives The aim of this study was to evaluate the influence of the contact of two lipsticks, one with common fixer and one with ultra fixer, on the color of a composite resin immediately, 30 min and 24 h after photoactivation. Material and methods Ninety specimens were prepared with a composite resin, Filtek-Z350. Specimens were polished and divided into 9 groups (n=10) according to time elapsed after photoactivation (A- immediately; B- 30 min; C- 24 h) and the contact with lipstick (UF- lipstick with ultra fixer; F- lipstick with common fixer). The control group was represented by specimens that did not have any contact with lipstick (C- without lipstick). Color measurements of the specimens were carried out using a spectrophotometer (Easyshade - CIE L* a* b* system). For UF and F groups, the baseline color of the specimens was measured immediately before pigmentation and the lipsticks were applied dry after 1 hour. The excess lipstick was removed with absorbent paper and final color checking was performed, including the control group. Differences between the final and baseline color measurements were calculated and data were analyzed statistically by the Kruskal-Wallis test at 5%. Results The means between the differences of color values were: AUF: 16.0; AF: 12.4; AC: 1.07; BUF: 9.51; BF: 8.3; BC: 0.91; CUF: 17.7; CF: 12.41; CC: 0.82. Conclusion Groups where lipstick was applied showed greater staining than the control group at the three evaluation times. The lipstick with ultra fixer stained more than the lipstick with common fixer. Time elapsed between photoactivation and contact with lipstick had a similar influence on the groups that received lipstick application.
Journal of Applied Oral Science | 2004
Andrea Nóbrega Cavalcanti; Catarina Lavigne; Céres Mendonça Fontes; Paula Mathias
O objetivo do presente estudo foi avaliar o efeito de diferentes sistemas adesivos sobre a microinfiltracao na interface de reparos em resina composta. Corpos-de-prova do composito Filtek Z250 (3M-ESPE) foram divididos aleatoriamente em cinco grupos (n=20) de acordo com a forma de confeccao do reparo: C - controle - condicionamento com acido fosforico a 35%; SB1 - condicionamento acido e aplicacao de uma camada do agente de uniao Single Bond (3M-ESPE); SB2 - condicionamento acido e aplicacao de duas camadas de Single Bond; SMP1 - condicionamento acido, aplicacao do primer e do adesivo do sistema Scotchbond Multipurpose Plus (3M-ESPE) e SMP2 - condicionamento acido e aplicacao apenas do adesivo do ultimo sistema. O reparo foi finalizado com a insercao de nova camada do composito restaurador. As amostras foram termocicladas (500 ciclos / 5-55°C [±2]) e imersas por 4h em solucao tamponada de azul de metileno 2% (pH 7,0). A penetracao do corante na interface do reparo foi avaliada em lupa estereoscopica (40x) por tres examinadores utilizando quatro escores representativos. A analise estatistica nao encontrou diferencas entre os grupos experimentais (Kruskal-Wallis / p > 0.05). Dessa maneira, os diferentes sistemas adesivos mostraram comportamento semelhante sobre a microinfiltracao na interface do reparo.The purpose of the present study was to evaluate the microleakage at the composite-repair interface using different bonding systems. Composite resin specimens (Filtek Z250 - 3M-ESPE) were divided into five groups (n=20) according to the following bonding mechanism: C - control - etching with 35% phosphoric acid; SB1 - etching and application of one coat of Single Bond (3M-ESPE); SB2 - etching and application of two coats of Single Bond (3M-ESPE); SMP1 - etching, application of Scotchbond Multi-Purpose primer (3M-ESPE) followed by the adhesive and, SMP2 - etching, application of Scotchbond Multi-Purpose adhesive (3M-ESPE) without the primer. Thereafter, all groups received new resin application. Samples were thermocycled (500 cycles / 5ºC - 55ºC [±2]) and immersed for 4h in 2% methylene blue buffered dye solution (7.0 pH). Three examiners measured the extent of microleakage in a stereoscope microscope, using four representative scores. For all experimental groups, no significant difference in microleakage at the repair was identified by Kruskal-Wallis test (p > 0.05). Therefore, different types of bonding systems presented the same effect on the dye penetration along the repair interface.
Contemporary Clinical Dentistry | 2013
Letícia Oliveria Saraiva; Thaiane Rodrigues Aguiar; Leonardo Costa; Lourenço Correr-Sobrinho; Leonardo Muniz; Paula Mathias
Aim: The aim of this study was to investigate the effect of phosphoric acid etching and the dentin pre-treatment with sodium hypochlorite (NaOCl) on the push-out bond strength between fiber post and root canal dentin. Materials and Methods: Root canals of 48 human incisors were selected, post spaces were prepared and assigned to four groups: G1-37% phosphoric acid (15 s); G2-5.25% NaOCl (2 min) +37% phosphoric acid (15 s); G3-37% phosphoric acid (60 s); and G4-5.25% NaOCl (2 min) +37% phosphoric acid (60 s). Fiber post cementation was performed with two-step etch-and-rinse adhesive system/dual-cured resin cement according to the manufacturers recommendation. After 24 h, each root was sectioned transversally into three slices (cervical, middle and apical) and the bond strength of each section was determined using a push-out bond strength test. Morphology analysis of the bonded interface was evaluated using a scanning electron microscopy. Push-out strength data (MPa) were analyzed by Analysis of Variance and Tukey-Kramer (α = 0.05). Results: Considering the NaOCl pre-treatment, no statistically significant differences were observed among groups; however, when the phosphoric acid was applied during 60 s in the apical portion without NaOCl pre-treatment, the bond strength was statistically significant increased. Conclusion: The NaOCl pre-treatment did not improve the bond strength of adhesive luting cement to root canal dentin. The findings suggest that the use of 37% phosphoric acid for 60 s may have a beneficial effect on bond strength in the apical root third.
International Scholarly Research Notices | 2013
Lívia Andrade Vitória; Thaiane Rodrigues Aguiar; Poliana Ramos Braga Santos; Andrea Nóbrega Cavalcanti; Paula Mathias
Aim. To evaluate the effect of cigarette smoke on water sorption and solubility of four adhesive systems. Materials and Methods. Sixteen disks of each adhesive system were prepared (Adper Scotchbond Multipurpose Adhesive (SA); Adper Scotchbond Multipurpose Adhesive System (Adhesive + Primer) (SAP); Adper Single Bond Plus (SB); Adper Easy One (EO)). Specimens were desiccated until a constant mass was obtained and divided into two groups (n = 8). One-half of the specimens were immersed in deionized water, while the other half were also immersed, but with daily exposure to tobacco smoke. After 21 days, disks were measured again and stored in desiccators until constant mass was achieved. Data were calculated according to ISO specifications and statistically analyzed. Results. The tobacco smoke only significantly affected the water sorption and solubility of EO. There were significant differences in both analyses among materials tested. The SB exhibited the highest water sorption, followed by EO, which demonstrated significantly higher solubility values than SB. The SA and SAP showed low water sorption and solubility, and there were no significant differences between the two. Conclusion. Regardless of smoke exposure, both simplified adhesive systems presented an inferior performance that could be related to the complex mixture of components in such versions.
Brazilian Journal of Oral Sciences | 2013
Andrea Nóbrega Cavalcanti; Evangelista Santos de Souza; Gabriela dos Santos Lopes; Anderson Pinheiro de Freitas; Roberto Paulo Correia de Araújo; Paula Mathias
AIM: This in vitro study evaluated the effect of using a dental hypersensitivity treatment on the bond strength to dentin of etch-and-rinse and self-etching simplified adhesive systems. METHODS: 40 healthy molars were used. The crowns of teeth were removed at the dentinoenamel junction, and remaining roots were sectioned in the mesiodistal direction along their long axis, separating the buccal and lingual/palatal halves. The segments obtained were ground, keeping the buccal or lingual/palatal face turned downwards in order to flatten the surface and produce a standardized smear layer. Prepared specimens were randomly distributed into 4 groups (n=10), according to the combination of surface treatment with the desensitizing dentifrice Colgate Sensitive Pro-Relief (Colgate Palmolive®) (test group - with dentifrice and control group - without dentifrice) and type of simplified bonding agent (etch-and-rinse and self-etching agents). Resin composite blocks were fabricated on the dentin surfaces, after application of bonding agents, and specimens were sectioned into rectangular stick-shaped specimens with cross-sectional area of approximately 0.8mm2. For microtensile bond strength tests, 4 sticks were randomly selected from the central region of specimens, and fixed to a universal test machine. Data were analyzed statistically by the Mann-Whitney U test (a=0.05). RESULTS: The bond strength obtained in the group without desensitizer (control) + etch-and-rinse agent was significantly higher compared with the other groups. Under both experimental conditions, the self-etching agent showed weak bond strength to dentin. CONCLUSIONS: Change in the dentin substrate by obliteration of tubules in the process of relieving dentinal sensitivity could reduce the bond strength of simplified etch-and-rinse and self-etching bonding agents.
Dental Materials Journal | 2015
Saryta Argolo; Paula Mathias; Thaiane Rodrigues Aguiar; Adriano Fonseca Lima; Sara Santos; Richard M. Foxton; Andrea Nóbrega Cavalcanti
The purpose of this study was to evaluate the influence of storage temperature and flask agitation on the water sorption (WS) and solubility (SL) of simplified adhesive systems. Seventy-two disc-shaped specimens were prepared according to the adhesive system (water/ethanol-based: Adper Single Bond 2; and water-based: One Coat Bond SL) and experimental conditions tested (mechanical agitation and storage temperature). Statistical analysis (3-way ANOVA, alpha=5%) found significantly greater WS and SL means for the water/ethanol-based system when compared to the water-based. Irrespective of factors studied, significant differences in WS and SL were noted between cold and room temperatures, with greater values been obtained at 1°C, and lower ones at 20°C. Agitation provided increased WS for both materials at all temperatures, but did not affect their SL. The mechanical agitation of the flask may negatively affect the dynamics of diffusion of simplified adhesive systems, even at extremely cold or warm temperatures.
JBR Journal of Interdisciplinary Medicine and Dental Science | 2014
Thaiane Rodrigues Aguiar; Lívia Aguilera Gaglianone; Paula Mathias
Objective: This review provides important insights into how the personal lifestyle behaviors may affect the oral health, especially with respect the Operative Dentistry field. Thus, the effect of lifestyle behavior on the dental hard tissues and restorative materials was explored, aiming to assess preventive and restorative strategies. Materials and Methods: Studies focusing on the potential effects of lifestyle behaviors on the restorative dentistry were used as a resource data. The collected literature was based on the original scientific full-papers from peerreviewed journals in PubMed database. Results: Lifestyle behaviors may lead to changes in the appearance of dental tissue and dental restorations. The frequent consumption of coffee, tea, red wine and tobacco can lead to discoloration of tooth and resin-based materials. In addition, cigarette smoke may hinder the adhesive bonding mechanism and also may affect the physical properties of restorative materials. Occupational exposure to acid environment, addicted to acid drinks and regular/competitive swimmers should be aware of the potential risk for dental erosion. Moreover, since sports injuries can seriously lead to tooth and facial damage, the use of protective devices during sports activities should be emphasized, especially for athletes and regular practitioners of high-risk activities. Conclusion: Lifestyle behaviors may jeopardize the dental tissues and accelerate the aging process of aesthetic dental restorations. Thus, the widespread knowledge of this potential risks on the oral health and restorative dentistry is beneficial for targeting educational health care programs, preventive and reparative therapies.
Indian Journal of Dental Research | 2014
Patrícia Miranda Leite‐Ribeiro; Thaís Feitosa Leitão de Oliveira; Paula Mathias; Elisângela de Jesus Campo; Viviane Almeida Sarmento
OBJECTIVE This study aimed to compare digital techniques for evaluating dental enamel de-/remineralization. MATERIALS AND METHODS Sixty extracted molars were subjected to a process of de- and remineralization. Radiographs were taken before and after each stage. These radiographs were evaluated by the conventional method and were then scanned and analyzed either with or without the use of image enhancement. Moreover, the gray levels (GLs) of the affected areas were measured. RESULTS All methods exhibited low sensitivity and identical levels of specificity (99.4%). Analysis of the grayscale levels found statistically significant differences between the initial radiographs (P < 0.05). The mean GL of the carious group was significantly lower than that of the remineralized group. The GL did not differ significantly between the initial and final radiographs of the remineralized group, although the mean of the first group was lower than that of the second, which demonstrated that the remineralization process restored the normal density of the dental enamel. CONCLUSION Measurement of the mean GL was sufficiently sensitive to detect small alterations in the surface of the enamel.
Revista de Odontologia da UNESP | 2018
Juliana de Almeida Souza; Lívia Andrade Vitória; Andrea Nóbrega Cavalcanti; Caroline Mathias; Paula Mathias
Introduction: Composite resins are subject to challenges in the oral cavity that are related to patients’ habits, which can compromise the restorations’ integrity and longevity. Therefore, it is necessary to study how consuming beverages and smoking cigarettes affects professional prophylaxis. Objective: The aim of this study was to evaluate how the sodium bicarbonate air-polishing affects the mass change (sorption and solubility) of a composite resin exposed to cigarette smoke, red wine, or coffee solution. Material and method: Eighty composite resin samples (FiltekZ350 XT 3M/ESPE) were prepared and distributed into 8 groups (n=10): G1 (air-polishing + distilled water), G2 (air-polishing + coffee), G3 (air-polishing + red wine), G4 (air-polishing + cigarette smoke), G5 (distilled water), G6 (coffee), G7 (red wine), or G8 (cigarette smoke). The composite resin samples were weighed in triplicate to obtain M1 (initial mass), M2 (mass after 30 days of storage in the tested solutions), and M3 (after desiccation) values. The sorption and solubility values were calculated and analyzed using 2-way ANOVA and Tukey’s test (5%). Result: The experimental groups had higher sorption and solubility values than the control groups, regardless of whether air-polishing was used. There was no statistically significant difference in the sorption between the air-polished and non-air-polished groups; however, the solubility was higher in the air-polished groups. Conclusion: Air-polishing using sodium bicarbonate powder was able to intensify the solubility process of the tested resins but did not significantly increase the sorption values. Descriptors: Composite resins; beverages; solubility. Souza, Vitória, Cavalcanti et al. Rev Odontol UNESP. 2018 May-June; 47(3): 183-188 184 184/188
Revista de Ciências Médicas e Biológicas | 2017
Tais Rocha Donato; Laís Sampaio Souza; Andrea Nóbrega Cavalcanti; Paula Mathias
Introducao : o tratamento estetico de dentes escurecidos e desafiador, especialmente quando o escurecimento ocorre de maneira pontual. Para alcancar bons resultados, e imprescindivel, alem do dominio da tecnica restauradora, o conhecimento sobre a composicao e caracteristicas opticas dos materiais restauradores. Objetivo : avaliar a cor resultante da sobreposicao de duas resinas compostas, quando utilizadas sobre um substrato escurecido. Metodologia : na confeccao dos corpos de prova, foram utilizadas duas matrizes metalicas e as resinas compostas Charisma A2 e OA2 e Opallis DA4 (simulando o substrato escurecido), perfazendo um total de 30 corpos de prova. As mensuracoes de cor foram realizadas em espectrofotometro de reflexao (UV-2600; Shimadzu) e as leituras colorimetricas foram realizadas no programa Color Analysis, seguindo os parâmetros do sistema CIEL*a*b*. A analise estatistica inferencial foi realizada pela ANOVA 1-criterio. Para as comparacoes multiplas, utilizou-se o teste Tukey (significância de 5%). Resultados : entre as tres variaveis, apenas na variavel a* houve diferenca estatistica (p<0,0001). Conclusao : os resultados permitiram a observacao de alteracao colorimetrica apos o uso de ambas as resinas, porem com melhores resultados para o grupo da resina AO2, quando em comparacao com o grupo da A2.