Following composite restorations, there is an obvious need for repair of them, which can be a challenging procedure in the clinical setting. This study aimed to assess the effect of surface treatment of composite with cold plasma spray (CPS) on microshear bond strength (µSBS) of repair composite in comparison with other surface treatments. A total of 120 discs (2 × 9 mm) were fabricated of Filtek Z250 composite. After aging by 5000 thermal cycles (5–55 °C), the samples were randomly divided into 4 groups (n = 30) for surface treatment by bur, Er,Cr:YSGG laser irradiation, sandblasting and CPS. After etching and application of Scotchbond Universal, Filtek Z250 repair composite was applied into Tygon tubes and bonded to the prepared surface. Half of the samples in each group (n = 15) were immersed in distilled water and incubated at 37 °C for 24 h. The other half was thermocycled. All samples then underwent µSBS test in a universal testing machine with a crosshead speed of 1 mm/min. The mode of failure was determined under a stereomicroscope. Data were analyzed by two-way ANOVA (p = .05). Aging (p = .13) and type of surface treatment (p = .44) had no significant effect on µSBS of repair composite. All failures were adhesive. Different surface treatments and aging process had no significant effect on µSBS of repair composite. However, application of CPS slightly increased the µSBS of repair composite after aging.

复合修复之后，显然需要对其进行修复，这在临床环境中可能是一个具有挑战性的过程。这项研究旨在评估与其他表面处理相比，冷等离子体喷涂（CPS）对复合材料进行表面处理对修复复合材料的微剪切粘结强度（µSBS）的影响。总共用Filtek Z250复合材料制作了120个圆盘（2×9毫米）。经过5000个热循环（5–55°C）老化后，将样品随机分为4组（n  = 30），以进行bur，Er，Cr：YSGG激光照射，喷砂和CPS表面处理。蚀刻并涂覆了Scotchbond Universal后，将Filtek Z250修补复合材料涂覆到Tygon管中并粘结到准备好的表面上。每组一半的样本（n ＝ 15）浸入蒸馏水中，并在37℃下孵育24小时。另一半是热循环的。然后，所有样品在通用测试机中以1 mm / min的十字头速度进行µSBS测试。在立体显微镜下确定失效模式。通过双向方差分析分析数据（p  = 0.05）。老化（p  = .13）和表面处理类型（p  = .44）对修补复合材料的µSBS没有显着影响。所有的失败都是黏性的。不同的表面处理和时效工艺对修补复合材料的µSBS没有明显影响。但是，CPS的使用略微增加了老化后修复复合材料的µSBS。