Farhat Maya, Daher Tony, Hajjar Jean-Jacques, Boulos Paul J
Department of Removable Prosthodontics, Faculty of Dental Medicine, Saint Joseph University, Beirut, Lebanon.
Clinical Associate Professor. Loma Linda University. Private Practice in Prosthodontics, LaVerne, CA, United States.
Saudi Dent J. 2024 Feb;36(2):368-373. doi: 10.1016/j.sdentj.2023.11.027. Epub 2023 Nov 28.
This in-vitro study aimed to evaluate the retentive force and dislodgment time of three stud attachment systems used for mandibular two-implant overdentures by simulating insertion/removal cycles.
From a simulation of a completely edentulous mandible with two parallel implants (Ø4.5 mm internal hex connection) (Zimmer Biomet, Warsaw, IN), 15 resin bases were fabricated and divided into three groups (n = 5 each): OT Equator (Rhein83, Bologna, IT), Locator (Zest Dental Solutions, Escondido, CA) and Locator R-Tx (Zest Dental Solutions, Escondido, CA). Pink inserts underwent 2000 cycles of thermocycling (SD MECHATRONIK GmbH, Feldkirchen-Westerham, Germany) and were soaked in citric acid for 24 days in an incubator. Each base underwent 2000 insertion/removal cycles on the Versa Test testing machine (Mecmesin Ltd., W. Sussex, UK) which was used to measure the retentive force and dislodgment time. The results were analyzed using ANOVA followed by the post-hoc Tukey test, Kruskal-Wallis test, and Pearson correlation coefficient test. A p-value of < 0.05 was considered statistically significant.
The retentive force and dislodgment time of the three systems significantly decreased over the cycles (p < 0.05). The Locator R-Tx showed significantly greater retentive force than did the other systems (p < 0.05), except for the last cycles wherein no significant difference was found with the OT Equator (p > 0.05). The OT Equator had the most stable retention over the cycles (p > 0.05; cycle 1500).
The three systems showed satisfactory retentive force during the 2000 cycles. The Locator R-Tx demonstrated the best retention, while the OT Equator exhibited the most stable retention over time.
本体外研究旨在通过模拟插入/取出循环，评估用于下颌双种植体覆盖义齿的三种球帽附着系统的固位力和脱位时间。
从模拟的无牙下颌骨（带有两个平行种植体（直径4.5毫米内六角连接））（Zimmer Biomet公司，印第安纳州华沙）制作15个树脂基托，并分为三组（每组n = 5）：OT Equator（Rhein83公司，意大利博洛尼亚）、Locator（Zest Dental Solutions公司，加利福尼亚州埃斯孔迪多）和Locator R-Tx（Zest Dental Solutions公司，加利福尼亚州埃斯孔迪多）。粉色嵌体进行2000次热循环（德国费尔德kirchen - Westerham的SD MECHATRONIK GmbH公司），并在培养箱中于柠檬酸中浸泡24天。每个基托在Versa Test测试机（英国西苏塞克斯郡的Mecmesin Ltd.公司）上进行2000次插入/取出循环，该测试机用于测量固位力和脱位时间。结果采用方差分析，随后进行事后Tukey检验、Kruskal-Wallis检验和Pearson相关系数检验。p值<0.05被认为具有统计学意义。
三种系统的固位力和脱位时间在循环过程中均显著下降（p < 0.05）。Locator R-Tx显示出比其他系统显著更大的固位力（p < 0.05），除了最后几个循环，此时与OT Equator无显著差异（p > 0.05）。OT Equator在整个循环过程中固位最稳定（p > 0.05；第1500个循环）。
三种系统在2000次循环中显示出令人满意的固位力。Locator R-Tx表现出最佳的固位效果，而OT Equator随时间推移表现出最稳定的固位。
