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目的 研究O型圈附着体内冠聚合度的改变对修复体固位力的影响。方法 采用机械加工方法制作O型圈附着体内冠替代物 ,分为 6 、9 、12 和 15 四组。应用O型圈后 ,铸造法制作外冠 ,通过拉力传感器测定外冠脱位力 ,该传感器与应变仪和微机相连。在微机中编制程序软件 ,可以记录外冠脱位时的瞬间峰值。结果 内、外冠脱位时 ,脱位力大小与内冠聚合度关系密切。内冠角度相同时 ,使用O型圈的脱位力明显大于不用O型圈 (P <0 .0 1)。不使用O型圈 ,当内冠聚合度大于 9 时 ,固位力明显下降。使用O型圈脱位力随内冠聚合度的增加而下降 ;当内冠聚合度为 15 时 ,其脱位力与不用O型圈内冠聚合度 6 时相当。结论 使用O型圈可以明显提高修复体固位力。使用O型圈内冠聚合度在 15 时 ,与不用O型圈内冠聚合度 6 时的固位力相当 ,提示O型圈式附着体内冠聚合度 15 以内时可满足修复固位要求
Objective To study the effect of the change of crown polymerization in the O-ring attachment on the retention force of the prosthesis. Methods O-rings were made by mechanical processing, and their coronal substitutes were divided into 6, 9, 12 and 15 groups. After O-ring is applied, the outer crown is made by the casting method and the dislocation force of the crown is measured by a tension sensor. The sensor is connected with the strain gauge and the microcomputer. Programming software in the computer, you can record the moment when the crown dislocation peak. Results, the outer crown dislocation, dislocation force and the degree of convergence of the crown is closely related. With the same inner crown angle, the dislocation force of using O-ring was obviously higher than that without O-ring (P <0.01). Do not use the O-ring, when the crown degree of polymerization is greater than 9, the retention force decreased significantly. The use of O-ring dislocation force decreases with the increase of the inner crown polymerization degree; when the inner crown polymerization degree is 15, the dislocation force is equivalent to that when the O-ring inner crown polymerization degree is 6. Conclusion The O-ring can significantly improve the retention of the prosthesis. O-ring crown polymerization degree at 15, with no O-ring crown polymerization degree of 6 when the retention force, suggesting O-ring attachment within the crown degree of polymerization within 15 to meet the repair retention requirements