Department of Orthodontics, Dental Clinics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
Kaohsiung J Med Sci. 2012 Dec;28(12):673-8. doi: 10.1016/j.kjms.2012.04.037. Epub 2012 Jul 28.
This study evaluates the influence of different implant materials on the primary stability of orthodontic mini-implants by measuring the resonance frequency. Twenty-five orthodontic mini-implants with a diameter of 2 mm were used. The first group contained stainless steel mini-implants with two different lengths (10 and 12 mm). The second group included titanium alloy mini-implants with two different lengths (10 and 12 mm) and stainless steel mini-implants 10 mm in length. The mini-implants were inserted into artificial bones with a 2-mm-thick cortical layer and 40 or 20 lb/ft(3) trabecular bone density at insertion depths of 2, 4, and 6 mm. The resonance frequency of the mini-implants in the artificial bone was detected with the Implomates(®) device. Data were analyzed by two-way analysis of variance followed by the Tukey honestly significant difference test (α = 0.05). Greater insertion depth resulted in higher resonance frequency, whereas longer mini-implants showed lower resonance frequency values. However, resonance frequency was not influenced by the implant materials titanium alloy or stainless steel. Therefore, the primary stability of a mini-implant is influenced by insertion depth and not by implant material. Insertion depth is extremely important for primary implant stability and is critical for treatment success.
本研究通过测量共振频率来评估不同种植体材料对正畸微种植体初期稳定性的影响。使用了 25 个直径为 2 毫米的正畸微种植体。第一组包含两种不同长度（10 和 12 毫米）的不锈钢微种植体。第二组包括两种不同长度（10 和 12 毫米）的钛合金微种植体和长度为 10 毫米的不锈钢微种植体。微种植体被插入到人工骨中，人工骨的皮质层厚度为 2 毫米，松质骨密度为 40 或 20 lb/ft³，插入深度分别为 2、4 和 6 毫米。使用 Implomates(®)设备检测微种植体在人工骨中的共振频率。通过双因素方差分析和 Tukey Honestly Significant Difference 检验（α=0.05）对数据进行分析。更大的插入深度导致更高的共振频率，而较长的微种植体则显示出较低的共振频率值。然而，种植体材料钛合金或不锈钢并不影响共振频率。因此，微种植体的初期稳定性受插入深度的影响，而不受种植体材料的影响。插入深度对初期种植体稳定性极为重要，是治疗成功的关键。
