Orthodontic mini-implant stability and the ratio of pilot hole implant diameter
Orthodontic mini-implant stability and the ratio of pilot hole implant diameter
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DOI：
10.1093/ejo/cjq157
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发表时间：
2012-02-01
影响因子：
2.6
通讯作者：
Shimizu, Noriyoshi
中科院分区：
文献类型：
--
作者：
Uemura, Miwa;Motoyoshi, Mitsuru;Shimizu, Noriyoshi
在正畸治疗中用于提供锚固的微型种植体的一个显著并发症是松动。本研究的目的是评估微型种植体的流动性之间的关系，在愈合阶段和种植体稳定性的预后。使用直径为0.8、0.9、1.0和1.1 mm的钻头在大鼠胫骨上钻孔。对插入的微型种植体（直径1.4 mm;矛头1.2 mm;最大和最小值之间的中点1.3 mm;长度4.0 mm）进行3周的实验性牵引力。组织学观察骨-种植体接触（BIC）。另20只雄性大鼠（20周龄）进行相同的程序，并使用Periotest测量牵引前后微型种植体的稳定性。用Scheffe检验进行统计学分析，0.9和1.0 mm组的BIC比显著大于其他组。除1.1mm组外，植入后3周测量的Periotest值显著低于植入时测量的值（P < 0.05）。为了获得微型种植体的稳定性，孔的直径应在微型种植体直径的69%至77%之间。插入3周后微型种植体的活动性显著降低，这意味着后续微型种植体稳定性的预后良好。
One notable complication of mini-implants that are used to provide anchorage in orthodontic treatment is loosening. The aim of this study was to evaluate the relationship between mini-implant mobility during the healing phase and the prognosis for implant stability.Twenty male Wistar rats (aged 20 weeks) were used. Drills with diameters of 0.8, 0.9, 1.0, and 1.1 mm were used to make pilot holes in the rat tibiae. The inserted mini-implants (diameter 1.4 mm; spearhead 1.2 mm; halfway between maximum and minimum 1.3 mm; length 4.0 mm) were subjected to an experimental traction of force for 3 weeks. Bone-to-implant contact (BIC) was observed histologically. Another 20 male rats (aged 20 weeks) underwent an identical procedure, and the stability of the mini-implants was measured using the Periotest before and after traction. The data were statistically analysed using Scheffe's test.The BIC ratios of the 0.9 and 1.0 mm groups were significantly greater than those of the other groups. The Periotest values measured 3 weeks after implant insertion were significantly lower (P < 0.05) than those measured at insertion, except in the 1.1 mm group. To obtain mini-implant stability, the hole diameter should be between 69 and 77 per cent of the diameter of the mini-implant. A significant decrease in the mobility of the mini-implants 3 weeks post-insertion implies a good prognosis for the subsequent mini-implant stability.