Department of Endodontics, İstanbul Okan University Faculty of Dentistry, İstanbul, Turkey.
Department of Chemical Engineering, Gebze Technical University Faculty of Engineering, Kocaeli, Turkey.
Odontology. 2022 Oct;110(4):769-776. doi: 10.1007/s10266-022-00698-5. Epub 2022 Feb 26.
Irrigation dynamics of syringe irrigation with different needle designs (side-vented, double side-vented, notched) and ultrasonic irrigation in the root canal with internal root resorption were evaluated using a computational fluid dynamics model. A micro-CT scanned mandibular premolar was used for modeling internal root resorption. The needles and the ultrasonic tip were positioned at 2, 4, and 5 mm from the working length. The insertion depth and the irrigation model were found influential on the shear stress and the irrigant extension. The extension of the irrigant increased toward 2-5 mm from the working length. Ultrasonic irrigation revealed the highest shear stress values regardless of the insertion depth. The shear stress distribution on the resorption cavity walls gradually increased when the needles were positioned coronally. The residence time of the irrigant in the canal was affected by the needle position relative to the internal root resorption cavity and the needle type.
采用计算流体动力学模型评估了不同针头设计（侧孔、双侧孔、缺口）的注射器冲洗和超声冲洗在根管内内吸收中的冲洗动力学。使用微 CT 扫描的下颌前磨牙进行内吸收建模。将针头和超声尖端放置在距工作长度 2、4 和 5 毫米处。插入深度和冲洗模型对剪切应力和冲洗剂扩展有影响。冲洗剂的扩展向工作长度 2-5 毫米的方向增加。无论插入深度如何，超声冲洗均显示出最高的剪切应力值。当针头位于冠方时，对吸收腔壁的剪切应力分布逐渐增加。相对于内吸收腔和针头类型，针头位置会影响冲洗剂在根管中的停留时间。
