Hirokane E, Takamizawa T, Tamura T, Shibasaki S, Tsujimoto A, Barkmeier W W, Latta M A, Miyazaki M
Eizo Hirokane, DDS, Department of Operative Dentistry, Nihon University Graduate School of Dentistry, Tokyo, Japan.
*Toshiki Takamizawa, DDS, PhD, Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan.
Oper Dent. 2021 Sep 1;46(5):E185-E198. doi: 10.2341/20-253-L.
This study aimed to evaluate the filler contents (FCs), flexural properties, depth of cure (DOC), wear resistance, and handling properties of different low-viscosity bulk-fill resin composites (LVBRCs) and to determine the correlations between the tested parameters. Six LVBRCs, Beautifil-Bulk (BBF), Bulk Base Hard (BBH), Bulk Base Medium (BBM), Filtek Bulk-Fill Flowable Restorative (FBF), G-ænial Bulk Injectable (GBI), and SDR flow+ Bulk-Fill Flowable (SDR) were used. The DOC and flexural property tests were conducted according to the ISO 4049 specifications. The flexural strength, elastic modulus, and resilience were determined in 12 specimens that were obtained from each of the 6 materials. Sliding-impact-wear testing was conducted by evaluating the wear facets of the specimens using a noncontact profilometer and by confocal laser scanning microscopy. The handling properties of the LVBRC was assessed via extrusion force and thread formation measurements. The DOC for the majority of the LVBRCs was approximately 4 mm. Although the FCs and mechanical properties were material dependent, some LVBRCs exhibited excellent flexural properties and wear resistance. The LVBRCs demonstrated a wide range of extrusion force and thread formation. Regarding the correlations between the tested parameters, extremely strong negative and positive correlations were observed for the DOC versus extrusion force, flexural strength versus elastic modulus, maximum depth versus volume loss, and maximum depth versus thread formation. In addition, strong correlations between FCs and DOC, resilience, wear resistance, and extrusion force were observed.
本研究旨在评估不同低粘度大块充填树脂复合材料（LVBRCs）的填料含量（FCs）、弯曲性能、固化深度（DOC）、耐磨性和操作性能，并确定测试参数之间的相关性。使用了六种LVBRCs，分别是Beautifil-Bulk（BBF）、Bulk Base Hard（BBH）、Bulk Base Medium（BBM）、Filtek Bulk-Fill Flowable Restorative（FBF）、G-ænial Bulk Injectable（GBI）和SDR flow+ Bulk-Fill Flowable（SDR）。DOC和弯曲性能测试按照ISO 4049规范进行。从这6种材料中的每种材料获取12个试样，测定其弯曲强度、弹性模量和韧性。通过使用非接触式轮廓仪评估试样的磨损面以及共聚焦激光扫描显微镜进行滑动冲击磨损测试。通过挤出力和拉丝成型测量评估LVBRC的操作性能。大多数LVBRCs的DOC约为4毫米。虽然FCs和机械性能因材料而异，但一些LVBRCs表现出优异的弯曲性能和耐磨性。LVBRCs表现出广泛的挤出力和拉丝成型范围。关于测试参数之间的相关性，观察到DOC与挤出力、弯曲强度与弹性模量、最大深度与体积损失以及最大深度与拉丝成型之间存在极强的负相关和正相关。此外，还观察到FCs与DOC、韧性、耐磨性和挤出力之间存在强相关性。
