种植体螺纹对种植体稳定性很重要吗?低密度聚氨酯片材的体外研究

L. Comuzzi, M. Tumedei, N. Di Pietro, T. Romasco, L. Montesani, A. Piattelli, U. Covani
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引用次数: 1

摘要

在拔牙后的条件下,不同的策略可以改善种植体的初级稳定性(PS)和骨与种植体的接触,例如螺钉和根尖螺纹的宏观几何形状,可以增强机械特性。在任何情况下,顶端区域设计在维持或改善PS中的作用,特别是在低质量骨中,仍然不清楚。因此,本研究旨在体外评估圆柱形(EE)和三种锥形(T3, TAC, Intra-lock)种植体中不同种植体顶端螺纹在模拟拔牙后条件下插入的插入扭矩(IT),移除扭矩(RT)和共振频率分析(RFA),植入低密度聚氨酯泡沫(10和20磅/立方英尺(PCF)),有和没有添加密度为30 PCF的皮质片。所有植入物的IT、RT和RFA值均与聚氨酯密度和皮质片的存在成正比,但TAC和Intra-lock植入物具有最新一代螺纹设计,其值总是显著较高(例如,在20 PCF密度中,TAC和Intra-lock植入物分别为IT: 18.6和18.6 Ncm, RT: 10.8和13.7 Ncm, RFA平均值分别为46和43 ISQ)。特别是,TAC植入物在最低密度泡沫(19 ISQ)中也达到了最高的RFA值。总之,目前的体外研究表明,TAC和内锁根尖设计和宏观几何形状可以在模拟低密度人工骨拔牙后条件下决定PS和聚氨酯-种植体接触的关键作用。
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Are Implant Threads Important for Implant Stability? An In Vitro Study Using Low-Density Polyurethane Sheets
Different strategies are known to improve implant primary stability (PS) and the bone-to-implant contact in post-extractive conditions, such as the macro-geometry of screws and apical threads, which can enhance the mechanical characteristics. In any case, the role of the apical area design in maintaining or improving the PS, especially in low-quality bone, still remains unclear. Thus, the present study aimed at evaluating in vitro the Insertion Torque (IT), Removal Torque (RT), and Resonance Frequency Analysis (RFA) of different implant apical threads in a cylindrical (EE) and in three conical implants (T3, TAC, Intra-lock) inserted in simulated post-extraction conditions on low-density polyurethane foams of 10 and 20 pounds per cubic foot (PCF), with and without the addition of a cortical sheet of 30 PCF in density. The IT, RT, and RFA values of all the implants tested were directly proportional to the polyurethane density and to the presence of the cortical sheet, but TAC and Intra-lock implants, which had the latest-generation thread design, always showed significantly higher values (e.g., IT: 18.6 and 18.6 Ncm, RT: 10.8 and 13.7 Ncm, RFA mean: 46 and 43 ISQ, in the 20 PCF density with the cortical sheet for TAC and Intra-lock, respectively). In particular, TAC implants also reached the highest RFA values in the lowest-density foam (19 ISQ). In conclusion, the present in vitro study demonstrated that TAC and Intra-lock apical designs and macro-geometries could play a key role in determining the PS and the polyurethane-implant contact in simulated post-extraction conditions in low-density artificial bone.
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