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INFLUÊNCIA DO MEIO DE ARMAZENAMENTO SOBRE AS PROPRIEDADES FÍSICO QUIMICAS E BIOATIVIDADE DE CIMENTOS ENDODÔNTICOS

2026-08-20T13:31:06Z

Título: INFLUÊNCIA DO MEIO DE ARMAZENAMENTO SOBRE AS PROPRIEDADES FÍSICO QUIMICAS E BIOATIVIDADE DE CIMENTOS ENDODÔNTICOS Autor: MENESES, Thais Gomes de Moraes Primeiro orientador: BAUER, José Roberto de Oliveira Abstract: Bioceramic sealers were introduced in endodontics in order to overcome the biological limitations that conventional endodontic sealers present. Current literature shows that bioceramic endodontic sealers have good radiopacity, fluidity, working time, pH alkalinization capacity, antibacterial activity and biocompatibility. However, it has as a disadvantage, solubility higher than the required standard ISO 6876/2012, which determines that an endodontic sealer must not exceed 3% of mass loss after immersion in distilled water. However, criticisms have been made of this methodology since distilled water does not represent the medium to which these materials are actually exposed. Therefore, modifications in the sorption and solubility tests have been carried out using a phosphate saline solution (PBS) as a storage medium, concluding that bioceramic sealers are less soluble when immersed in PBS. It is speculated that the lower solubility is justified by the deposition of a layer of hydroxyapatite that fills the voids generated by the solubility. The present study proposed to evaluate the influence of a high concentrated storage medium (SBF) on the properties of sorption, solubility, fluid absorption, bioactivity and pH alkalinization capacity of a bioceramic sealer (BioRoot RCS) and a resin-based cement epoxy (AH Plus). 24 samples were made for each sealer tested, which were subsequently randomly divided into 3 experimental groups (n = 8). The samples were desiccated for 30 days, weighed and stored in containers containing 5ml of distilled water, PBS or SBF. The pH readings and weighings were performed after 24 hours, 48 hours, 7, 30, 60 and 90 days. To analyze the formation of precipitates, 2 specimens from each group were selected and taken for observation using scanning electron microscopy (SEM) and composition reading by dispersive energy spectroscopy (EDS). The data of sorption / solubility / fluid absorption were found in TwoWay Analysis of Variance (Solution vs. Cement) and Holm-Sidak test ( = 0.05) for contrast medium. An analysis of pH, SEM and EDS, were performed descriptively. The AH Plus was not influenced by the storage solution, for all evaluated properties (p> 0.05). BioRoot presents greater solubility when immersed in SBF, followed by water and PBS, which are not differentiating between themselves. There was formation of precipitates on the surface of the BioRoot sample only in PBS and SBF. AH Plus maintained a neutral pH, while BioRoot was able to alkalinize the medium. Therefore, the storage medium influenced by physicalchemical properties and the bioactive potential of bioceramic sealer. However, conventional tests of sorption, solubility and fluid absorption performed in distilled water should not be indicated for bioceramic sealers, since they do not present evidence on in vivo behavior and still mask their bioactivity, which is the main differential material. Instituição: Universidade Federal do Maranhão Tipo do documento: Dissertação

Influência de diferentes substâncias irrigadoras do canal radicular na resistência de união de pinos de fibra de vidro anatomizados

2026-06-16T12:52:39Z

Título: Influência de diferentes substâncias irrigadoras do canal radicular na resistência de união de pinos de fibra de vidro anatomizados Autor: SOUSA, Nielsen Barros Primeiro orientador: SANTANA, Ivone Lima Abstract: The aim of this study was to evaluate the effect of using different irrigating solutions on bond strength of relining on fiber post (FP). Bovine mandibular incisors were selected. All specimens had their crowns sectioned for standardization of root remaining in the final length of 17mm. After storage in distilled water under cooling, the roots were divided into 3 groups (n=10) by type of irrigating solutions used in endodontic treatment: Group I: endodontically treated teeth and irrigated with saline solution; Group II: endodontically treated teeth and irrigated with solution of Sodium Hypochlorite (NaOCl) 2.5%; Group III: endodontically treated teeth and irrigated with a solution of Chlorhexidine (CHX) 2%. The strategy of standardized endodontic working length with 16mm deep. The conduits were desobturados with heated pluggers and drills type Largo. This procedure allowed the use of FP that were anatomised with composite resin cement and cemented with dual cure resin. After endodontic treatment, the specimens were stored for seven days under humid conditions at 37°C, and sectioned at the cervical, middle and apical thirds in six parts. Then submitted to the mechanical test push-out in a universal testing machine at a crosshead speed of 0.5mm/min. Data were collected and subjected to analysis of variance (ANOVA) followed by Tukey's test with a significance level of 5% (p<0,05). Group II had a mean bond strength (13.63 ±4.51 P=0.041) higher than other groups in the cervical third. It was concluded that the type of irrigator can influence adherence FP anatomised to the root canal walls. Instituição: Universidade Federal do Maranhão Tipo do documento: Dissertação

AVALIAÇÃO IN VITRO DA ATIVIDADE ANTIFÚNGICA DE EXTRATOS VEGETAIS SOBRE CANDIDA SPP.

2026-06-08T12:48:22Z

Título: AVALIAÇÃO IN VITRO DA ATIVIDADE ANTIFÚNGICA DE EXTRATOS VEGETAIS SOBRE CANDIDA SPP. Autor: NUNES, Marjorie Adriane da Costa Primeiro orientador: PEREIRA , Antônio Luiz Amaral Abstract: Candida yeasts are often associated with normal oral mucosa. However, in specific situations, such as immunological, chemical and mechanical changes, can trigger infections called candidiasis. When associated with the use of prostheses, candidiasis is called denture stomatitis. Candida biofilm is considered the main etiological factor in denture stomatitis basis of the prosthesis and its removal is necessary by the use of chemical cleaners associated or not to antifungal agents. Given this, the objective of this study was to evaluate the antifungal potential of plant extracts on Candida spp. and on biofilm formed in acrylic resin specimens. We conducted laboratory study, in vitro, by analyzing the performance of plant extracts (Passiflora edulis leaves and Psidium guajava L., peel Schinus terebinthifolius Raddi, mesocarp Orbignya phalerata Mart. And leaves and bark of Anacardium occidentale L. ) at a concentration of 100mg / ml of standard strains C. albicans (ATCC90028) and C. glabrata (ATCC2001). The antimicrobial activity was evaluated by the agar diffusion method, determination of minimum inhibitory concentration (MIC) by microdilution broth method, followed by the subcultures in agar to determine the concentration Fungicide Min. The positive controls were 0.12% chlorhexidine gluconate and fluconazole 128 mg / mL. It was also evaluated the effect of Psidium guajava extract of C. albicans biofilm (ATCC90028) formed on acrylic resin specimens. The specimens were submitted to the treatments: herbal extract of Psidium guajava in the concentration of 300mg / ml (15 min); Sodium hypochlorite (NaOCl) 0.5% (10 min) as positive control and negative control as distilled and deionized water (15 min). The number of viable Candida cells was expressed as colony forming units (CFU) / mm2. The Psidium guajava L. extract presented halos of inhibition of 17.08 mm for C. albicans and C. glabrata to 20.41 mm. The other extracts did not form inhibition zones for the tested strains. The MIC and MFC of Psidium guajava extract for C. albicans was 15mg / ml and 30mg / ml respectively and C. glabrata 3.75mg / ml and 15mg / ml. With respect to the effect of the extract on the biofilm, it was observed a significant reduction in CFUs acrylic resin specimens when compared to the negative control group. It was concluded in this study that the extract of Psidium guajava leaves showed antifungal activity against strains of C. albicans and C. glabrata and that it significantly reduced the biofilm formed on the acrylic resin specimens. Instituição: Universidade Federal do Maranhão Tipo do documento: Dissertação

Tendências de gastos com cuidados odontológicos por provedores e serviços de saúde, e Quintis do índice sociodemográfico em 195 países, de 2000 a 2017

2026-05-26T17:49:44Z

Título: Tendências de gastos com cuidados odontológicos por provedores e serviços de saúde, e Quintis do índice sociodemográfico em 195 países, de 2000 a 2017 Autor: CAMPOS, Handreza Régia Santos Siqueira Primeiro orientador: HUGO, Fernando Neves Abstract: The number of people affected by oral diseases in the world is approximately 3.5 billion. In this scenario, dental care spending is uneven across countries. Health expenditure analyses have been conducted to understand the current global health financing situation and to assist in health planning. The objective of this study is to describe trends in dental care spending, by health providers and services, and by Socio-Demographic Index quintiles in 195 countries, between 2000 and 2017. Health account data were extracted from 195 countries and expenditures categorized according to the System of Health Accounts. Missing or non-existent data were estimated using a Bayesian multivariate model to construct complete time series. Spending trends were measured using generalized linear regression and the Prais-Winsten method. The results showed that per capita expenditure and total expenditure, in millions of dollars, on dental care by total and outpatient/clinical service providers revealed a clear gradient, with values increasing with greater socioeconomic development. In 2017, countries in high quintile had per capita expenditure 278 and 93 times higher than countries in the low and lower-middle quintile, respectively. Dental expenditure represented a small share in relation to total health expenditure, regardless of the level of development of the countries (in 2017, low quintile – 2,55% and high – 4,66%). In the trend analysis, all quintiles showed an increase in per capita expenditure and total dental expenditure, in relation to total dental providers and outpatient/clinical care. It was concluded that there were large inequalities in the distribution by levels of economic development in dental care spending. To date, this work is the most comprehensive proposal for analyzing trends in dental care expenditure. The findings of this study can help managers identify the prioritization that has been given to public oral health policies, also considering the context of the Universal Health Coverage Agenda, the Global Oral Health Strategy and the Sustainable Development Goals. Instituição: Universidade Federal do Maranhão Tipo do documento: Dissertação