Castro Fabrício Luscino Alves de, Pazinatto Flávia Bittencourt, de Lima Érick, Cesar Paulo Francisco, Reges Rogério Vieira
Gen Dent. 2016 Jul-Aug;64(4):57-61.
This study evaluated the influence of material opacity and preheating on the sorption and solubility of a composite resin material. A commercially available composite resin and an 8 × 2-mm circular metallic matrix were used to fabricate a total of 60 specimens in 6 shades, of which 3 had conventional opacity (CA2, CA3, and CA3.5) and 3 were opaque (OA2, OA3, and OA3.5). Specimens were prepared at a room temperature of 25°C or preheated to 60°C (n = 5 per shade at each temperature). The specimens were weighed 3 times: M1, dried for 24 hours at 37°C; M2, stored for 7 days in 75% ethanol at 37°C; and M3, dried for an additional 24 hours at 37°C. The weights were used to calculate the sorption and solubility of the composite resin and were analyzed using 2-way analysis of variance and Tukey tests (α = 5%). Composite resin specimens heated at 60°C yielded lower values of sorption and solubility than did specimens prepared at 25°C (P < 0.05). The sorption and solubility of conventional and opaque composite shades were found to be similar (P > 0.05), except for shade CA2, which presented a greater mean solubility value than OA2 (P = 0.004). Therefore, preheating was beneficial, as it lowered both the sorption and solubility of the evaluated composite resin, but opacity had little effect on these properties.
本研究评估了材料不透明度和预热对复合树脂材料吸附和溶解性的影响。使用一种市售复合树脂和一个8×2毫米的圆形金属模具，制作了总共60个试件，分为6种色度，其中3种为常规不透明度（CA2、CA3和CA3.5），3种为不透明（OA2、OA3和OA3.5）。试件在25°C的室温下制备或预热至60°C（每个温度下每种色度n = 5）。对试件称重3次：M1，在37°C下干燥24小时；M2，在37°C的75%乙醇中储存7天；M3，在37°C下再干燥24小时。利用这些重量计算复合树脂的吸附和溶解性，并采用双向方差分析和Tukey检验进行分析（α = 5%）。在60°C下加热的复合树脂试件的吸附和溶解性值低于在25°C下制备的试件（P < 0.05）。发现常规和不透明复合色度的吸附和溶解性相似（P > 0.05），但色度CA2除外，其平均溶解性值高于OA2（P = 0.004）。因此，预热是有益的，因为它降低了所评估复合树脂的吸附和溶解性，但不透明度对这些性能影响不大。
