Periodontics Department, Dental Faculty, Tehran University of Medical Sciences, Tehran, Iran.
Periodontics Department, Dental Implant Research Center, Dentistry Research Institute, Dental Faculty, Tehran University of Medical Sciences, Tehran, Iran.
BMC Oral Health. 2021 Oct 21;21(1):541. doi: 10.1186/s12903-021-01881-w.
This study aimed to evaluate the effect of the microthread design at the implant neck on the preservation of marginal bone around immediately-placed implants in a 5-year follow up.
Thirty patients received 41 immediately placed implants which were randomly assigned to treatment groups with microthreaded implants (test group, n = 22) or threaded implants (control group, n = 19). Clinical and radiographic analyses were carried out after 1 and5 years. Plaque index, bleeding on probing, suppuration, probing depth and marginal bone loss were subject to evaluations. The results were analyzed with the T-test, Fisher's exact test and Mann-Whitney U test.
No implants failed; thirty-five implants (in 27 patients); 21 microthreaded and 14 threaded implants; completed the 5 year follow up. The mean values of the marginal bone loss in microthreaded and threaded groups were 1.12 ± 0.95 mm and 0.87 ± 0.78 mm, respectively during an observation period of 70.9 ± 10.4 months; the differences in marginal bone loss and other pre-implant parameters were not significant between groups (P > 0.05).
Both implant designs showed acceptable results in terms of the clinical parameters and marginal bone level. Within the limitation of this study, the results did not demonstrate any superiority of the microthread design compared to threaded one in marginal bone preservation around immediately placed implants over 5 years of loading.
本研究旨在评估种植体颈部的微螺纹设计对即刻植入后 5 年边缘骨保留的影响。
30 名患者共植入 41 颗即刻种植体，随机分为微螺纹种植体（试验组，n=22）和螺纹种植体（对照组，n=19）两组。分别于术后 1 年和 5 年进行临床和影像学分析。评估菌斑指数、探诊出血、溢脓、探诊深度和边缘骨丧失。采用 T 检验、Fisher 确切检验和 Mann-Whitney U 检验对结果进行分析。
无种植体失败；35 颗种植体（27 名患者）；21 颗微螺纹种植体和 14 颗螺纹种植体；完成了 5 年随访。微螺纹组和螺纹组的边缘骨丧失平均值分别为 1.12±0.95mm 和 0.87±0.78mm，观察期为 70.9±10.4 个月；两组边缘骨丧失和其他植入前参数差异无统计学意义（P＞0.05）。
两种种植体设计在临床参数和边缘骨水平方面均表现出良好的效果。在本研究的限制范围内，结果并未显示微螺纹设计在 5 年负荷期内对即刻植入种植体周围边缘骨保留有任何优于螺纹设计的优势。
