Physical properties of two bis-acryl interim materials: color stability, flexural strength and shear bond strength to flowable composite resin as add-on material

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 37 o C 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 37 o C for 24 h and subjected to shear bond strength test. Data were analyzed using one-way ANOVA and Tukey's test (α = 0.05

Effects of various beverages on characteristics of provisional restoration materials

“…Only Protemp®4, which is also chemical cured, insignificantly changed in color. This result is consistent with a previous study (Cunha et al, 2017 ). The Protemp®4 has a higher filler content than the Integrity®, which is also a bis‐acrylic composite.…”

Color Appearance of Various Provisional Restorative Materials for Rehabilitation Upon Aging

“…However, it should be mentioned that this study's limitation was that the material's thickness and color affect these properties. 25 26 Various initial colors of material could lead to more color sensitivity measured simultaneously. Accordingly, further study should compare various thicknesses and shades among different types of temporary restorative material upon aging.…”

“…23 It was described that discoloration of resin composite is related to liquid penetration into the resin matrix and filler-matrix interface; thus, size and filler particles influenced aging discoloration. 24 25 26 Different methods have been used to bring out color alteration. However, the methods that evaluate the color appearance of the temporary restoration suddenly after finishing restoration or a short period of aging limit the capability to justify the clinical performance of the restorative material for oral reconstruction.…”