Alizadeh Oskoee Parnian, Savadi Oskoee Siavash, Pournaghi-Azar Fatemeh, Dibazar Sana, Esmaeili Mehdi
Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
Front Dent. 2022 Aug 10;19:26. doi: 10.18502/fid.v19i26.10597. eCollection 2022.
The present study aimed to investigate the effect of preheating on the color stability and surface roughness of a silorane-based composite resin. A total of 44 Filtek P90 composite resin disks, (10mm×1mm), were fabricated using plastic molds and were divided into two groups. In group 2, the composite resin syringes were placed in a thermostatically controlled water bath at 55‒60°C before preparing the disks. After polishing the samples with silicon carbide papers, they were stored in distilled water for 48 hours. Roughness and color parameters were then measured in two stages: immediately after retrieval from distilled water and after 40 days of storage in tea solution. Finally, the differences in roughness and color parameters were recorded. Independent sample t-test and regression analysis were used at a significance level of P<0.05. Based on the findings of the present study, there was no significant difference among the mean ∆E values (P=0.4); however, a significant difference in mean surface roughness (P=0.01) was found between the two groups. Regression analysis showed a significant relationship between the study groups in terms of surface roughness and ΔE values (preheated: r = 0.73; non-preheated: r= 0.76). Filtek P90 silorane-base composite showed ΔE>3.3 and surface roughness above 0.2µ under preheated and non-preheated conditions and discoloration increased following preheating.
本研究旨在探讨预热对基于硅橡胶的复合树脂颜色稳定性和表面粗糙度的影响。使用塑料模具制作了总共44个Filtek P90复合树脂圆盘（10mm×1mm），并将其分为两组。在第2组中，在制备圆盘之前，将复合树脂注射器置于55‒60°C的恒温控制水浴中。用碳化硅砂纸对样品进行抛光后，将其在蒸馏水中储存48小时。然后分两个阶段测量粗糙度和颜色参数：从蒸馏水中取出后立即测量，以及在茶溶液中储存40天后测量。最后，记录粗糙度和颜色参数的差异。采用独立样本t检验和回归分析，显著性水平为P<0.05。基于本研究的结果，平均∆E值之间无显著差异（P=0.4）；然而，两组之间的平均表面粗糙度存在显著差异（P=0.01）。回归分析表明，研究组在表面粗糙度和∆E值方面存在显著关系（预热组：r = 0.73；未预热组：r = 0.76）。在预热和未预热条件下，Filtek P90硅橡胶基复合树脂的∆E>3.3，表面粗糙度高于0.2µ，并且预热后变色增加。
