Restrepo Ana María, Giraldo Carlos Andrés, Torres-López Ana María, Latorre-Correa Federico, Ardila Carlos M
Prosthodontics Postgraduate Program, Faculty of Dentistry, University of Antioquia, Medellín, Colombia.
PhD. Biomaterials Research Group, Associate Professor, Bioengineering Program, Faculty of Engineering, University of Antioquia, Medellín, Colombia.
J Clin Exp Dent. 2025 Aug 1;17(8):e929-e935. doi: 10.4317/jced.62873. eCollection 2025 Aug.
Proper finishing and polishing are crucial for reducing surface roughness and eliminating the incompletely polymerized oxygen-inhibited layer. This study compared surface characteristics - specifically water contact angle, surface roughness, and morphology of three nanohybrid composite resins polished with two different multi-step polishing systems.
We evaluated Filtek Z250 (3M), Tetric N-Ceram (Ivoclar), and Spectra Smart (Dentsply), all in shade A2. Thirty-nine discs per resin (9 mm diameter × 2 mm thickness) were fabricated, stored in distilled water at 37°C for 24 hours, and pre-polished with silicon carbide paper (600, 1000, and 1200 grit). Final polishing employed two systems: the 3-step Astropol system (Ivoclar) and the 2-step ShapeGuard system (Diatech), with each system tested through six reuse cycles (three samples per resin per cycle). Surface analysis included water contact angle measurement, profilometry, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS).
The Astropol system demonstrated significantly greater hydrophobicity (107.6° ± 10.9°) than ShapeGuard (99.1° ± 9.0°). Among the tested resins, Filtek Z250 polished with Astropol showed the lowest surface roughness (0.27 ± 0.11 µm), while Spectra Smart polished with ShapeGuard showed the highest (0.78 ± 0.20 µm). Polishing system reuse showed no significant effects on results. SEM revealed no noTable morphological changes, and EDS confirmed consistently high SiO2 content across all resins.
Both polishing system and resin composition significantly influence surface characteristics. Filtek Z250 performed optimally with both polishing systems. Further research should investigate the long-term effects of polishing system reuse. Nanohybrid resins, polishing systems, surface roughness, contact angle, SEM.
适当的修整和抛光对于降低表面粗糙度以及消除未完全聚合的氧抑制层至关重要。本研究比较了用两种不同的多步抛光系统抛光的三种纳米混合复合树脂的表面特性，具体为水接触角、表面粗糙度和形态。
我们评估了均为A2色的Filtek Z250（3M公司）、Tetric N-Ceram（义获嘉公司）和Spectra Smart（登士柏公司）。每种树脂制作39个圆盘（直径9毫米×厚度2毫米），在37℃蒸馏水中储存24小时，并用碳化硅砂纸（600、1000和1200目）进行预抛光。最终抛光采用两种系统：三步Astropol系统（义获嘉公司）和两步ShapeGuard系统（迪亚特公司），每个系统通过六个重复循环进行测试（每个循环每种树脂三个样品）。表面分析包括水接触角测量、轮廓仪测量、扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）。
Astropol系统表现出比ShapeGuard系统显著更高的疏水性（107.6°±10.9°比99.1°±9.0°）。在测试的树脂中，用Astropol系统抛光的Filtek Z250表面粗糙度最低（0.27±0.11微米），而用ShapeGuard系统抛光的Spectra Smart表面粗糙度最高（0.78±0.20微米）。抛光系统的重复使用对结果无显著影响。SEM显示无明显形态变化，EDS证实所有树脂中二氧化硅含量始终很高。
抛光系统和树脂成分均对表面特性有显著影响。Filtek Z250在两种抛光系统下均表现最佳。进一步研究应调查抛光系统重复使用的长期影响。纳米混合树脂、抛光系统、表面粗糙度、接触角、SEM。
