Assistant Lecturer, Department of Prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
Professor, Department of Prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
J Prosthet Dent. 2020 May;123(5):738.e1-738.e6. doi: 10.1016/j.prosdent.2020.01.009. Epub 2020 Mar 10.
Retentive force and loss of retention should be considered when selecting an attachment. Studies that evaluate the retentive force and the effect of repeated cycles of insertion and removal on the TITACH attachment with a metal-to-metal interface are needed.
The purpose of this in vitro study was to measure the retention of mandibular implant-retained overdentures with 2 different attachment designs before and after 1000 insertion and removal cycles.
Two dental implants were inserted at the mandibular canine region bilaterally in a completely edentulous model. Sixteen mandibular implant-assisted overdentures were fabricated to form 2 groups, each with a different attachment design. One group received 8 pairs of TITACH attachments, while the other group received 8 pairs of LOCATOR attachments. A cyclic loading machine was used to perform 1000 insertion and removal cycles. A universal testing machine was used to evaluate retentive force before and after insertion and removal cycles. Data were analyzed by using the Mann-Whitney U test and Wilcoxson signed-rank test.
When retentive forces before and after 1000 insertion and removal cycles were compared, the TITACH attachment showed significantly higher retentive force than the LOCATOR (P<.05). However, the LOCATOR attachment showed a significantly lower percentage change in retentive force (P<.05).
The TITACH attachment group showed favorable initial and final retentive force compared with the Zest Anchor LOCATOR attachment group. However, the LOCATOR attachment group showed favorable lower percentage change in retentive force.
在选择附着体时，应考虑固位力和固位体的丧失。需要研究评估具有金属-金属界面的 TITACH 附着体的固位力以及插入和移除的重复循环对其的影响。
本体外研究的目的是测量 2 种不同附着体设计的下颌种植覆盖义齿在 1000 次插入和移除循环前后的保留力。
在完全无牙模型的下颌犬齿区域双侧植入 2 个种植体。制作 16 个下颌种植辅助覆盖义齿，分为 2 组，每组采用不同的附着体设计。一组接受 8 对 TITACH 附着体，另一组接受 8 对 LOCATOR 附着体。使用循环加载机进行 1000 次插入和移除循环。使用万能试验机在插入和移除循环前后评估固位力。数据采用曼-惠特尼 U 检验和 Wilcoxson 符号秩检验进行分析。
比较 1000 次插入和移除循环前后的固位力时，TITACH 附着体的固位力明显高于 LOCATOR（P<.05）。然而，LOCATOR 附着体的固位力变化百分比明显较低（P<.05）。
与 Zest Anchor LOCATOR 附着体组相比，TITACH 附着体组的初始和最终固位力表现良好。然而，LOCATOR 附着体组的固位力变化百分比较低。
