Ugurlu Muhittin
Süleyman Demirel University, Faculty of Dentistry,Department of Restorative Dentistry, IspartaTurkey.
Eur Oral Res. 2020 May 1;54(2):62-68. doi: 10.26650/eor.20200042.
To evaluate the effects of surface coating and one-year water storage on the flexural strength of fluoride-releasing restorative materials.
Forty specimens were prepared from each material; GCP Glass Fill (GCP), Amalgomer CR (AHL), Zirconomer (Shofu), Fuji IX GP Capsule (GC), Beautifil II (Shofu), Estelite Σ Quick (Tokuyama) and reliaFIL LC (AHL). The specimens were randomly divided into two groups; surface coated with G-Coat Plus (GC) and uncoated. Each group was subdivided into two groups stored in distilled water at 37◦C for 24 h and 1 year before testing (n=10). The flexural strength was evaluated using three-point bending test according to the ISO 4049:2009 standard using a universal testing machine. After flexural strength test, a cross-section of the coated specimens was evaluated with scanning electron microscopy (SEM).
A significant increase was observed on the flexural strength of Amalgomer CR, Zirconomer and Fuji IX GP after 24 h when G-Coat Plus was applied (p<0.05). This significant increase was observed on the flexural strength of only Amalgomer CR and Zirconomer after 1 year (p<0.05). The highest flexural strength was obtained with Beautifil II, Estelite Σ Quick and reliaFIL LC after 24 h and 1 year (p<0.05). After 1 year, there was decrease on the flexural strength of the other materials except Beautifil II, Estelite Σ Quick and reliaFIL LC.
The resin coating improved the flexural strength of some glass ionomer-based materials but the water aging decreased the same physical properties.
评估表面涂层及一年水储存对释氟修复材料弯曲强度的影响。
每种材料制备40个样本；玻璃离子体增强型复合树脂（GCP玻璃填料）（GCP）、银汞合金CR（AHL）、含锆陶瓷（松风）、富士IX GP胶囊装（GC）、碧兰Ⅱ（松风）、Estelite Σ Quick（德山）和reliafil LC（AHL）。样本随机分为两组；一组用G-Coat Plus（GC）进行表面涂层处理，另一组未涂层。每组再细分为两组，分别在37℃蒸馏水中储存24小时和1年，然后进行测试（n = 10）。根据ISO 4049:2009标准，使用万能试验机通过三点弯曲试验评估弯曲强度。弯曲强度测试后，用扫描电子显微镜（SEM）评估涂层样本的横截面。
应用G-Coat Plus后，24小时时观察到银汞合金CR、含锆陶瓷和富士IX GP的弯曲强度显著增加（p<0.05）。1年后，仅观察到银汞合金CR和含锆陶瓷的弯曲强度有显著增加（p<0.05）。24小时和1年后，碧兰Ⅱ、Estelite Σ Quick和reliafil LC的弯曲强度最高（p<0.05）。1年后，除碧兰Ⅱ、Estelite Σ Quick和reliafil LC外，其他材料的弯曲强度均下降。
树脂涂层提高了一些玻璃离子基材料的弯曲强度，但水老化降低了相同的物理性能。
