| Autor: |
AZEVEDO CRUZ, MARCELO WERNECK, TURSSI, CECÍLIA PEDROSO, BOTELHO DO AMARAL, FLÁVIA LUCISANO, BASTING, ROBERTA TARKANY, VIEIRA JUNIOR, WALDEMIR FRANCISCO, GOMES FRANÇA, FABIANA MANTOVANI |
| Předmět: |
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| Zdroj: |
American Journal of Dentistry; Aug2023, Vol. 36 Issue 4, p201-206, 6p |
| Abstrakt: |
Purpose: To evaluate over time the bond strength to dentin of different resin composites (RBCs) associated with the universal adhesive system applied with self-etching or total-etching strategies. Methods: 60 human third molars were obtained, randomly divided into experimental groups (n = 10) according to RBCs: methacrylate-based nanofilled (Z350 XT); low-viscosity Ormocer-based bulk-fill (Admira Fusion X-base Universal); or high-viscosity Ormocer-based bulk-fill composite (Admira Fusion X-tra). The adhesion procedure was performed using a universal adhesive (Futurabond U) applied in self-etching or total-etching mode. Occlusal preparations (Class I) were made, measuring 4 mm in mesiodistal length, 4 mm in depth, and 3 mm in buccolingual height. The cavities were restored considering the RBCs and adhesive strategies, and the light curing was performed using a LED unit (BluePhase) as recommended by the manufacturers. For this, the nanofilled RBCs were inserted by the oblique incremental technique while the bulk-fill RBCs were inserted in single increments. The samples were stored in water for 24 hours in an oven; to be sectioned, the sticks were randomly separated, stored in distilled water for 24 hours (immediate) or 12 months (long-term), and taken to the universal machine for a microtensile test (MPa). The fractured sticks were examined to classify the type of fracture. The results were analyzed by ANOVA and Tukey's test (α = 0.05). Results: The MPa values of methacrylate-based nanofilled or high-viscosity Ormocer-based RBC were not affected by the strategy used to apply the universal adhesive system (P > 0.05). However, for the low-viscosity Ormocer-based RBC, higher values were obtained when the total-etching strategy was used compared to the self-etching mode (P < 0.05). After 12 months, when using the total-etching strategy low-viscosity Ormocer-based RBC, higher MPa values were obtained compared to the other materials (P < 0.05). [ABSTRACT FROM AUTHOR] |
| Databáze: |
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