Abstract：
This study aimed to clarify the fracture resistance of resin abutments built on endodontically treated roots with the remaining coronal teeth via static and cyclic loading tests. Endodontically treated bovine roots, which had a remaining coronal tooth covered with an occupied area for a quarter and half of the circumference at the tensile side or covered the circumference at both the tensile and compressive sides, were fabricated to build up to the resin abutment. Fracture resistance was evaluated via static and cyclic loading tests by applying a load of 30° to the tooth axis. Half of the circumference of the remaining coronal tooth showed a significantly higher static fracture load and survival rate. The remaining coronal tooth on the compressive side improved the dynamic fracture resistance associated with severe fractures. The occupied area and location of the remaining coronal tooth affected the static and dynamic fracture resistances.
摘要：
这项研究旨在通过静态和循环载荷测试，阐明在牙髓处理的根部与剩余的冠状牙齿上建造的树脂基台的抗断裂性。经牙髓处理的牛根，剩余的冠状牙齿在拉伸侧覆盖了四分之一和一半的圆周，或者在拉伸侧和压缩侧覆盖了圆周，被制造成树脂基台。通过对齿轴施加30°的载荷，通过静态和循环载荷测试来评估抗断裂性。剩余冠状牙的一半周长显示出明显更高的静态骨折负荷和存活率。压缩侧剩余的冠状牙齿改善了与严重骨折相关的动态骨折阻力。剩余冠状牙的占用面积和位置影响静态和动态断裂阻力。
