ABSTRACT
Aim: To evaluate the effect of different surface treatments and adhesive approaches on the microshear bond strength of resin cement to a polymer-infiltrated ceramic network (PICN). Methods: PICN blocks were randomly assigned into 9 groups (n=10): CTRL: no treatment; HF: 5% hydrofluoric acid etching; HF-S: HF + silane; HF-S-A: HF-S + adhesive (Adper Single Bond 2); HF-UA: HF + universal adhesive (Single Bond Universal); SB: sandblasting with 50 µm Al2O3 particles; SB-S: SB + silane; SB-S-A: SB-S + adhesive; SB-UA: SB + universal adhesive. Resin cement microcylinders (Ø = 0.96 mm; height = 1 mm) (RelyX Ultimate) were built upon the PICN surface after roughness and contact angle measurements. Next, microshear bonding tests (µSBS) were performed (0.5 mm/min) after water storage (37ºC, 90 days) and thermocycling (12,000 cycles; 5ºC-55ºC). Failure modes were observed under stereomicroscope. Bond strength data were analyzed by two-way ANOVA/Tukey's test and t-tests. Kruskal-Wallis/Dunn's tests were conducted for roughness and contact angle data (α = 0.05). Results: A rougher surface and lower contact angles were observed for Sandblasting. HF-S (18.54 ± 2.03 MPa), SB-S (19.00 ± 1.66 MPa) and SB-UA (18.07 ± 2.36 MPa) provided the highest bond strength values, followed by the other treated groups. The CTRL group resulted in lower bond strength (7.18 ± 2.34 MPa). Conclusion: Hydrofluoric acid etching followed by silane application and sandblasting followed by silane or universal adhesive are useful clinical steps to enhance bonding to PICN. Adhesive applications after HF etching have no advantages in bonding to PICN
Subject(s)
Surface Properties , Ceramics , Dentin-Bonding Agents , Resin Cements , Air Abrasion, Dental , Hydrofluoric AcidABSTRACT
O objetivo deste estudo foi descrever o acesso aotratamento e as necessidades terapêuticas dos pacientes que buscam atendimento nas clínicas do Curso de Odontologia da Universidade Federal de Santa Maria (Brasil)por meio dos encaminhamentos realizados pelo Serviço de Triagem do curso, bem comoverificar quantos desses pacientes efetivamentereceberam atendimento. Trata-se de um estudo observacional descritivo de caráter quantitativo,baseado em dados secundários existentes nos registros das listas de espera do Serviço de Triagem do curso e nos dados do software Gerenciador Odontológico usado para registro de procedimentos. Foram incluídos no estudo os dados dospacientes que buscaram o serviço entre 2015 e2017. Os dados foramanalisados utilizando o programa estatístico STATA 14.0, apresentando frequências relativas e absolutas. O número total de encaminhamentos realizados no período foi de 3.945, a maioria destes para pessoas do sexo feminino e com idade média de 51,2 anos. Do total de encaminhamentos, em 60,2% (2.377) dos casos o atendimento não se concretizou.Nas situações que resultaram em atendimento, em77,6%(1.221)dos casos,este ocorreuno mesmoano do encaminhamento. A maioria dos encaminhamentos foram para clínicas de atendimento integrado, indicando um acúmulo de necessidades terapêuticas. Esse tipo de avaliação é fundamental para o planejamento estratégico de um serviço de saúde, pois permite fazer uma análise e mapeamento do fluxo dos pacientes, além de uma reflexão sobre as possibilidades de acesso para as pessoas que buscam o serviço (AU).
The objective of this study was to describe the access to treatment and therapeutic needs of patients who seek care in the clinics of the Schoolof Dentistry at the Federal University of Santa Maria (Brazil) by analyzingthe referralsmadeby the schoolScreening Service, as well as verify how many of these patients effectively received dental care. It is a quantitative descriptive observational study, based on secondary data from the records of waiting lists of theschoolScreening Serviceand the data from the Dental Manager software used to register the procedures. Data from patients who sought dental services between 2015 and 2017 were included. Data wereanalyzed by using the statistical software STATA 14.0, showingrelative and absolute frequencies. The total number of referrals made in the period was 3,945, most of which to female patients at theaverage age of 51.2 years. From the total of referrals, in 60.2% (2,377) of cases the service was not completed. From the situations which resulted in dental care service, in 77.6% (1,221) of the cases, the service was not provided during the same year. Most referrals were sent to the integrated care clinics, whatindicatesan assortmentof therapeutic needs. This kind of evaluation is fundamental for the strategic planning of a health service, since it provides an analysis and mapping of patient influx in addition to reflecting upon the possibilities of access to people who seek the service (AU).
