Sedky Rana Abdelrehim, Chew Hooi Pin, Nour Khaled Aly, Abuelsadat Shaimaa Mohamed, Elsherbini Dina, Fok Alex Siu Lun
Department of Operative Dentistry, Faculty of Dentistry, Ain-Shams University.
Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota.
Dent Mater J. 2023 Sep 29;42(5):692-699. doi: 10.4012/dmj.2022-241. Epub 2023 Aug 22.
This study evaluated the interfacial integrity of deep (6 mm) Class-II (OM/OD) restorations placed using different bulk-fill resin composites [Filtek™ Bulk Fill Flowable Restorative (BF) and Filtek™ Bulk Fill Posterior Restorative (BP) (3M ESPE, St. Paul, MN, USA)] of different increment thicknesses (2 or 4 mm). BP was used for capping in all cases, while Filtek™ Z250 Universal Restorative (3M ESPE) was used as the control material. Interfacial debonding was measured during curing through acoustic emission (AE), followed by image analysis using micro-computed tomography and scanning electron microscopy. Microhardness testing was also conducted to assess degree of conversion. Depth of cure was adequate in all restorations. Specimens with 4-mm thick first increment of BF, which had a higher shrinkage strain, produced most AE events and debonding. Thus, bulk filling of deep cavities using bulk-fill resin composites with a high shrinkage strain should be avoided.
本研究评估了使用不同增量厚度（2或4毫米）的不同大块充填树脂复合材料[Filtek™大块充填可流动修复材料（BF）和Filtek™大块充填后牙修复材料（BP）（美国明尼苏达州圣保罗市3M ESPE公司）]进行的深度为6毫米的II类（邻面/牙合面）修复体的界面完整性。所有病例均使用BP进行覆盖，而Filtek™ Z250通用修复材料（3M ESPE）用作对照材料。在固化过程中通过声发射（AE）测量界面脱粘，随后使用微计算机断层扫描和扫描电子显微镜进行图像分析。还进行了显微硬度测试以评估转化率。所有修复体的固化深度均足够。BF首次增量为4毫米厚的标本具有较高的收缩应变，产生的AE事件和脱粘最多。因此，应避免使用具有高收缩应变的大块充填树脂复合材料对深腔进行大块充填。
