Sinjari Bruna, Santilli Manlio, D'Addazio Gianmaria, Rexhepi Imena, Gigante Alessia, Caputi Sergio, Traini Tonino
Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" of Chieti-Pescara, 66100 Chieti, Italy.
Electron Microscopy Laboratory, University G. d'Annunzio Chieti-Pescara, 66100 Chieti, Italy.
Materials (Basel). 2020 Jul 7;13(13):3026. doi: 10.3390/ma13133026.
Dentine pretreatment through sandblasting procedures has been widely studied but no curve test results are currently available. Thus, the aim herein was to in vitro compare the adhesive strength in sandblasted or not samples using a universal testing machine. Thirty -two bovine teeth were divided into two groups, namely test ( = 16 bars), sandblasting with aluminum oxide particles (50 µm) was performed before the adhesion procedures), and control ( = 16 bars), where no sandblasting procedure was performed. A bi-material curve test was used to evaluate the characteristics of the dentine pretreatment in terms of tensile stress and fracture strength. A scanning electron microscope (SEM) was used to analyze the fracture topography in the composite, bonding, dentin, and at the relative interfaces. The results demonstrated a statistically significant difference between the two groups in terms of tensile stress at maximum load showing values of 84.300 ± 51.342 MPa and 35.071 ± 16.609 MPa, respectively for test and control groups ( = 0.033). Moreover, a fracture strength test showed values of 18.543 ± 8.145 MPa for test and 8.186 ± 2.833 MPa for control group ( = 0.008). In conclusion, the sandblasting treatment of the dentine significantly influenced the mechanical resistance of the adhesion in this in vitro study.
通过喷砂程序进行牙本质预处理已得到广泛研究，但目前尚无弯曲试验结果。因此，本研究的目的是使用万能试验机在体外比较喷砂或未喷砂样本的粘结强度。将32颗牛牙分为两组，即试验组（n = 16），在粘结程序前用氧化铝颗粒（50 µm）进行喷砂处理，以及对照组（n = 16），未进行喷砂处理。采用双材料弯曲试验来评估牙本质预处理在拉伸应力和断裂强度方面的特性。使用扫描电子显微镜（SEM）分析复合材料、粘结剂、牙本质及其相对界面处的断裂形貌。结果表明，两组在最大载荷下的拉伸应力方面存在统计学显著差异，试验组和对照组的值分别为84.300±51.342 MPa和35.071±16.609 MPa（p = 0.033）。此外，断裂强度试验显示试验组的值为18.543±8.145 MPa，对照组为8.186±2.833 MPa（p = 0.008）。总之，在本体外研究中，牙本质的喷砂处理显著影响了粘结的机械抗力。
