Esfahanizadeh Gholamreza, Jalalian Ezatollah, Salehi Seyyede Niloufar, Ghasemi Mahsa, Golalipour Shaghayegh
Prosthodontics Department, Faculty of Dentistry, Tehran Medical Sciences of Azad University, Tehran, Iran.
Faculty of Dentistry, Tehran Medical Sciences of Azad University, Tehran, Iran.
Int J Dent. 2024 Dec 27;2024:4723112. doi: 10.1155/ijod/4723112. eCollection 2024.
This study aimed to assess the effect of cyclic loading on the amount of fixture-abutment microgap in short implants compared to standard implants. This in vitro experimental study was conducted on two groups of short and standard implants ( = 10). The microgap at the fixture-abutment interface was measured under a light microscope at ×75 magnification. The implants were mounted in an acrylic resin to simulate the jawbone. They were then subjected to cyclic loading by applying 75 N load with 1 Hz frequency along the longitudinal axis of each implant (perpendicular to the abutment surface). After 500,000 cycles, corresponding to 20 months of mastication in the oral environment, the implants were removed from the acrylic resin, and the microgap at the fixture-abutment interface was measured again under a stereomicroscope by a blinded examiner. Data were then analyzed by -test using SPSS version 22 ( = 0.05). The mean microgap was 13.59 ± 3.80 µm in the standard and 20.41 ± 11.30 µm in the short implants before cyclic loading (=0.087). These values changed to 15.22 ± 5.44 and 24.53 ± 21.85 µm, respectively, after cyclic loading. No significant difference was noted in the amount of microgap between the standard and short implants after cyclic loading (=0.222). Cyclic loading increased the amount of fixture-abutment microgap in both the standard and short implants. However, the difference in this respect was not significant between the two implant lengths. Thus, short implants could be reliably used in patients with limitations for surgery to restore function and esthetics.
本研究旨在评估与标准种植体相比，循环加载对短种植体中种植体-基台微间隙量的影响。本体外实验研究在两组短种植体和标准种植体（每组n = 10）上进行。在75倍放大率的光学显微镜下测量种植体-基台界面处的微间隙。将种植体安装在丙烯酸树脂中以模拟颌骨。然后通过沿每个种植体的纵轴（垂直于基台表面）以1Hz频率施加75N的载荷对其进行循环加载。在500,000次循环后，相当于口腔环境中20个月的咀嚼，将种植体从丙烯酸树脂中取出，由一位不知情的检查者在体视显微镜下再次测量种植体-基台界面处的微间隙。然后使用SPSS 22版软件进行t检验分析数据（α = 0.05）。循环加载前，标准种植体的平均微间隙为13.59±3.80μm，短种植体为20.41±11.30μm（P = 0.087）。循环加载后，这些值分别变为15.22±5.44μm和24.53±21.85μm。循环加载后，标准种植体和短种植体之间的微间隙量没有显著差异（P = 0.222）。循环加载增加了标准种植体和短种植体中种植体-基台微间隙的量。然而，在这方面，两种种植体长度之间的差异并不显著。因此，短种植体可可靠地用于手术受限的患者，以恢复功能和美观。
