PDF(Pubmed)
Abstract：
UNASSIGNED: Endodontically treated teeth are more prone to vertical root fracture with the mechanical property changes to some extent during root canal treatment. This study aimed to investigate the effects of a bioceramic sealer on the mechanical properties of tooth roots.
UNASSIGNED: Dentin discs were dried by two different methods (ethanol drying and paper points drying) and then filled with a BC sealer named iRoot SP. SEM and EDS were used to analyze the newly formed minerals in dentin tubules. Elastic modulus and hardness of the secondary dentin in areas proximal to the primary dentin (PD-SD) and areas proximal to canal or iRoot SP (SD-C/SD-iRoot SP) were measured using nanoindentation technique. The compressive strength of roots filled with iRoot SP were tested by compressive loading test.
UNASSIGNED: (1) Penetration and mineralization: Paper points drying was more conducive to iRoot SP adhesion, spreading and penetration into the dentin tubules than 95% ethanol drying. (2) Micromechanical properties: After filling root canal with iRoot SP, the elastic modulus and hardness of SD-iRoot SP were higher than those of PD-SD (P = 0.001 and P = 0.000). (3) Fracture resistance: The compressive strength of the roots filled with iRoot SP was not significantly different from that of the roots unprepared and unfilled (P = 0.957), but was higher than that of the roots prepared and unfilled (P = 0.009).
UNASSIGNED: Excessive drying (95% ethanol drying method) is not conducive to the penetration and mineralization of the BC sealer iRoot SP into dentin tubules. The good bioactivity of iRoot SP was responsible for increasing the elastic modulus and hardness of dentin, which strengthened the prepared roots.
UNASSIGNED: Dentin discs were dried by two different methods (ethanol drying and paper points drying) and then filled with a BC sealer named iRoot SP. SEM and EDS were used to analyze the newly formed minerals in dentin tubules. Elastic modulus and hardness of the secondary dentin in areas proximal to the primary dentin (PD-SD) and areas proximal to canal or iRoot SP (SD-C/SD-iRoot SP) were measured using nanoindentation technique. The compressive strength of roots filled with iRoot SP were tested by compressive loading test.
UNASSIGNED: (1) Penetration and mineralization: Paper points drying was more conducive to iRoot SP adhesion, spreading and penetration into the dentin tubules than 95% ethanol drying. (2) Micromechanical properties: After filling root canal with iRoot SP, the elastic modulus and hardness of SD-iRoot SP were higher than those of PD-SD (P = 0.001 and P = 0.000). (3) Fracture resistance: The compressive strength of the roots filled with iRoot SP was not significantly different from that of the roots unprepared and unfilled (P = 0.957), but was higher than that of the roots prepared and unfilled (P = 0.009).
UNASSIGNED: Excessive drying (95% ethanol drying method) is not conducive to the penetration and mineralization of the BC sealer iRoot SP into dentin tubules. The good bioactivity of iRoot SP was responsible for increasing the elastic modulus and hardness of dentin, which strengthened the prepared roots.
摘要：
■经牙髓处理的牙齿在根管治疗过程中更容易发生垂直牙根断裂，机械性能在一定程度上发生变化。本研究旨在研究生物陶瓷密封剂对牙根力学性能的影响。
■通过两种不同的方法（乙醇干燥和纸点干燥）干燥牙本质圆盘，然后用名为iRootSP的BC封口机填充。使用SEM和EDS分析牙本质小管中新形成的矿物质。使用纳米压痕技术测量了初级牙本质（PD-SD）附近区域和根管或iRootSP（SD-C/SD-iRootSP）附近区域的次级牙本质的弹性模量和硬度。通过压缩载荷试验测试了用iRootSP填充的根部的抗压强度。
■（1）渗透和矿化：纸点干燥更有利于iRootSP粘附，扩散和渗透到牙本质小管比95%乙醇干燥。(2)微机械特性:用iRootSP填充根管后,SD-iRootSP的弹性模量和硬度均高于PD-SD（P=0.001和P=0.000）。（3）抗断裂性：用iRootSP填充的根部的抗压强度与未准备和未填充的根部的抗压强度没有显着差异（P=0.957），但高于制备和未填充的根（P=0.009）。
■过度干燥（95％乙醇干燥方法）不利于BC封闭剂iRootSP渗透到牙本质小管中并矿化。iRootSP良好的生物活性有助于提高牙本质的弹性模量和硬度,这加强了准备好的根。
■通过两种不同的方法（乙醇干燥和纸点干燥）干燥牙本质圆盘，然后用名为iRootSP的BC封口机填充。使用SEM和EDS分析牙本质小管中新形成的矿物质。使用纳米压痕技术测量了初级牙本质（PD-SD）附近区域和根管或iRootSP（SD-C/SD-iRootSP）附近区域的次级牙本质的弹性模量和硬度。通过压缩载荷试验测试了用iRootSP填充的根部的抗压强度。
■（1）渗透和矿化：纸点干燥更有利于iRootSP粘附，扩散和渗透到牙本质小管比95%乙醇干燥。(2)微机械特性:用iRootSP填充根管后,SD-iRootSP的弹性模量和硬度均高于PD-SD（P=0.001和P=0.000）。（3）抗断裂性：用iRootSP填充的根部的抗压强度与未准备和未填充的根部的抗压强度没有显着差异（P=0.957），但高于制备和未填充的根（P=0.009）。
■过度干燥（95％乙醇干燥方法）不利于BC封闭剂iRootSP渗透到牙本质小管中并矿化。iRootSP良好的生物活性有助于提高牙本质的弹性模量和硬度,这加强了准备好的根。
