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Physical properties of two bis-acryl interim materials: color stability, flexural strength and shear bond strength to flowable composite resin as add-on material
Cunha, Leonardo Fernandes da; Fernandes, Ana Beatriz Franco; Mushashe, Amanda Mahammad; Correr, Gisele Maria; Gonzaga, Carla Castiglia.
  • Cunha, Leonardo Fernandes da; Universidade Positivo. Operative Dentistry Area. Program in Dentistry. Curitiba. BR
  • Fernandes, Ana Beatriz Franco; Universidade Positivo. Operative Dentistry Area. Curitiba. BR
  • Mushashe, Amanda Mahammad; Universidade Positivo. Operative Dentistry Area. Curitiba. BR
  • Correr, Gisele Maria; Universidade Positivo. Operative Dentistry Area. Program in Dentistry. Curitiba. BR
  • Gonzaga, Carla Castiglia; Universidade Positivo. Operative Dentistry Area. Program in Dentistry. Curitiba. BR
Braz. j. oral sci ; 16: e17053, jan.-dez. 2017. tab
Article in English | LILACS, BBO | ID: biblio-884104
ABSTRACT

Aims:

The objective of this study was to evaluate the mechanical properties of two bis-acryl interim resin materials, such as color stability, flexural strength and shear bond strength to flowable composite resin, simulating clinical situations when this material has to be used for repair as add-on. Two shades of two bis-acryl interim resin materials [Structur 2 SC (shades Bleach and A2); Protemp 4 (shades A1 and A2)] were evaluated. Discs (5 x 1 mm) were fabricated and baseline color was determined after 1 h. Ten specimens were immersed at 37oC in solutions of distilled water (control) and cola-based soft drink (Coca-Cola). Color measurements were performed with a spectrophotometer using CIELab parameters. Color readings were again measured after 2 hours, 4 hours, 24 hours and 7 days. Flexural strength was determined using the three-point bending test (10 x 1 x 2 mm) on a universal testing machine (0.5 mm/min) (n = 10). Discs of bis-acryl resin were embedded in acrylic resin, planned and distributed in 2 groups G1 - Filtek Z350 Flow/Protemp4 and G2 - Grandio SO Flow/Structure 3 (n = 15). Cylinders (3.5 x 2 mm) were made with the flowable composite resins and polymerized for 20 s. The specimens were stored in distilled water at 37oC for 24 h and subjected to shear bond strength test. Data were analyzed using one-way ANOVA and Tukey's test (α = 0.05). ΔE values were higher for Structur Bleach (3.08)a compared with Protemp 4 (shade A1, 2.22)b (shade A2, 2.25)b. There were no significant differences between Structur Bleach and Structur A2 (2.62)ab. Coca-Cola presented higher ΔE values (3.08)a than (2.00)b. Regarding time, ΔE values increased from 1.84a after 2 h to 2.31b after 4 h. The higher values were observed after 24 h and 7 days (2.93c and 3.09d, respectively). No significant differences were observed for the flexural strength of Structur (22.05 MPa)a and Protemp 4 (19.01 MPa)a. The repairs executed with Structur/Grandio flow (9.21 MPa)a were similar to those performed with Protemp 4/Z350XT flow (10.71 MPa)a. It can be concluded that the two bis-acyl resins evaluated showed similar physical and mechanical properties (AU)
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Color / Composite Resins / Shear Strength Language: English Journal: Braz. j. oral sci Journal subject: Dentistry Year: 2017 Type: Article Affiliation country: Brazil Institution/Affiliation country: Universidade Positivo/BR

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Full text: Available Index: LILACS (Americas) Main subject: Color / Composite Resins / Shear Strength Language: English Journal: Braz. j. oral sci Journal subject: Dentistry Year: 2017 Type: Article Affiliation country: Brazil Institution/Affiliation country: Universidade Positivo/BR