Kwon Yee-Seo, Namgoong Hee, Kim Jung-Hoon, Cho In Hee, Kim Myung Duk, Eom Tae Gwan, Koo Ki-Tae
Seoul National University School of Dentistry, Seoul, Korea.
J Periodontal Implant Sci. 2013 Feb;43(1):41-6. doi: 10.5051/jpis.2013.43.1.41. Epub 2013 Feb 28.
The objective of this study was to evaluate the effect of microthreads on removal torque and bone-to-implant contact (BIC).
Twelve miniature pigs for each experiment, a total of 24 animals, were used. In the removal torque analysis, each animal received 2 types of implants in each tibia, which were treated with sandblasting and acid etching but with or without microthreads at the marginal portion. The animals were sacrificed after 4, 8, or 12 weeks of healing. Each subgroup consisted of 4 animals, and the tibias were extracted and removal torque was measured. In the BIC analysis, each animal received 3 types of implants. Two types of implants were used for the removal torque test and another type of implant served as the control. The BIC experiment was conducted in the mandible of the animals. The P1-M1 teeth were extracted, and after a 4-month healing period, 3 each of the 2 types of implants were placed, with one type on each side of the mandible, for a total of 6 implants per animal. The animals were sacrificed after a 2-, 4-, or 8-week healing period. Each subgroup consisted of 4 animals. The mandibles were extracted, specimens were processed, and BIC was analyzed.
No significant difference in removal torque value or BIC was found between implants with and without microthreads. The removal torque value increased between 4 and 8 weeks of healing for both types of implants, but there was no significant difference between 8 and 12 weeks. The percentage of BIC increased between 2 and 4 weeks for all types of implants, but there was no significant difference between 4 and 8 weeks.
The existence of microthreads was not a significant factor in mechanical and histological stability.
本研究的目的是评估微螺纹对去除扭矩和骨与种植体接触（BIC）的影响。
每次实验使用12只小型猪，共24只动物。在去除扭矩分析中，每只动物在每个胫骨中植入2种类型的种植体，这些种植体经过喷砂和酸蚀处理，但边缘部分有或无微螺纹。愈合4、8或12周后处死动物。每个亚组由4只动物组成，取出胫骨并测量去除扭矩。在BIC分析中，每只动物接受3种类型的种植体。两种类型的种植体用于去除扭矩测试，另一种类型的种植体作为对照。BIC实验在动物的下颌骨中进行。拔除P1-M1牙齿，经过4个月的愈合期后，植入2种类型的种植体各3个，每种类型在下颌骨的一侧各植入1个，每只动物共植入6个种植体。愈合2、4或8周后处死动物。每个亚组由4只动物组成。取出下颌骨，处理标本并分析BIC。
有微螺纹和无微螺纹的种植体在去除扭矩值或BIC方面均未发现显著差异。两种类型的种植体在愈合4至8周时去除扭矩值均增加，但在8至12周之间无显著差异。所有类型的种植体在2至4周时BIC百分比均增加，但在4至8周之间无显著差异。
微螺纹的存在不是机械和组织学稳定性的重要因素。
