Parker Raeesa, Mulder Riaan, Keanly Colm
Faculty of Dentistry - Department of Restorative Dentistry, University of the Western Cape, 148 Francie Van Zijl Dr, Tygerberg, Cape Town, South Africa.
MethodsX. 2023 Jul 27;11:102302. doi: 10.1016/j.mex.2023.102302. eCollection 2023 Dec.
Polymerisation shrinkage of composite resins is a clinical challenge which has been well documented in the literature. Many studies investigating polymerisation shrinkage stress measure cuspal deflection, which is a manifestation of this stress. The introduction of flowable bulk-fill composite (BFRBC) materials has streamlined the restorative process, though the shrinkage and cuspal deflection from these BFRBCs has not been compared with regards to its use with polyethylene fibers (Ribbond fibers). The authors describe a method to measure the cuspal deflection of flowable BFRBCs placed in cavities of standardised dimensions at distinct steps of the restorative process, with and without fiber-reinforcement and using x-ray micro-computed tomography. Co-ordinate points are established on the buccal and lingual aspects of scanned specimens using the Volume Graphics VG Studio max 3.2.5 (Hiedelberg, Germany 2018) software. The system allows for these landmarks to be established across each scan (of the same tooth), ensuring standardization of each specimen. Further anatomical points are used to enable analysis. Comparison of angles generated across these points determines the extent of cuspal deflection.•A method of measuring the cuspal deflection of composite resins is proposed.•Experimental procedures are provided.•Data analysis methods are outlined.
复合树脂的聚合收缩是一个临床挑战，这在文献中已有充分记载。许多研究聚合收缩应力的实验通过测量牙尖偏斜来进行，牙尖偏斜是这种应力的一种表现形式。可流动的大块充填复合树脂（BFRBC）材料的引入简化了修复过程，不过这些BFRBC材料的收缩和牙尖偏斜情况，尚未与聚乙烯纤维（Ribbond纤维）使用时的情况进行比较。作者描述了一种测量方法，用于测量在修复过程的不同阶段，置于标准化尺寸窝洞中的可流动BFRBC材料的牙尖偏斜，分别在有和没有纤维增强的情况下，以及使用X射线显微计算机断层扫描时进行测量。使用Volume Graphics VG Studio max 3.2.5（德国海德堡，2018年）软件，在扫描样本的颊侧和舌侧建立坐标点。该系统允许在每次扫描（同一颗牙齿）中建立这些标记点，确保每个样本的标准化。使用更多解剖学点进行分析。比较这些点所形成的角度，可确定牙尖偏斜的程度。
•提出了一种测量复合树脂牙尖偏斜的方法。
•提供了实验步骤。
•概述了数据分析方法。
