Background: to assess the radiological marginal bone loss between bone-level or tissue-level dental implants through a systematic review of literature until September 2019. Methods: MEDLINE, Embase and other database were searched by two independent authors including only English articles. Results: The search provided 1028 records and, after removing the duplicates through titles and abstracts screening, 45 full-text articles were assessed for eligibility. For qualitative analysis 20 articles were included, 17 articles of them for quantitative analysis counting a total of 1161 patients (mean age 54.4 years) and 2933 implants, 1427 inserted at Tissue-level (TL) and 1506 inserted at Bone-level (BL). The survival rate and the success rate were more than 90%, except for 2 studies with a success rate of 88% and 86.2%. No studies reported any differences between groups in term of success and survival rates. Three studies showed that BL-implants had statistically less marginal bone loss (p < 0.05). Only one study reported statistically less marginal bone loss in TL-implants (p < 0.05). Conclusion: In the most part of the studies, differences between implant types in marginal bone loss were not statistically significant after a variable period of follow-up ranged between 1 and 5 years.

中文翻译：

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骨水平和组织水平种植牙的放射学结果：系统评价

背景：直到2019年9月，通过系统的文献回顾来评估骨水平或组织水平的牙科植入物之间的放射学边缘性骨丢失。方法：MEDLINE，Embase和其他数据库由两名独立作者进行搜索，仅包括英文文章。结果：搜索提供了1028条记录，并且通过标题和摘要筛选除去重复项后，评估了45篇全文文章的资格。定性分析包括20篇文章，其中17篇文章用于定量分析，共计1161例患者（平均年龄54.4岁）和2933枚植入物，其中1427枚在组织水平（TL）插入，1506枚在骨水平（BL）插入。除两项研究分别有88％和86.2％的成功率外，存活率和成功率均超过90％。没有研究报告两组之间在成功率和存活率方面有任何差异。三项研究表明，BL植入物的边缘骨丢失在统计学上较少（p <0.05）。只有一项研究报告说，TL植入物的边缘性骨丢失统计较低（p <0.05）。结论：在大部分研究中，在1到5年的可变随访期内，种植体类型之间的边缘性骨丢失之间的差异在统计学上无统计学意义。