Programa de Pós-Graduação em Odontologia, Universidade Luterana do Brasil, Canoas, RS, Brazil.
Universidade Feevale, Novo Hamburgo, RS, Brazil.
PLoS One. 2019 Nov 11;14(11):e0225046. doi: 10.1371/journal.pone.0225046. eCollection 2019.
To compare the longevity and marginal bone loss of narrow-diameter (≤3.3-mm) versus standard-diameter implants supporting single crowns.
The MEDLINE (via PubMed), Scopus, and SciELO databases were searched for relevant publications. In addition, the scientific references provided by each of the implant companies that appeared in the search were reviewed. Intervention studies comparing longevity and bone loss between narrow-diameter and standard-diameter implants were included.
The search was limited to in vivo studies in humans. The query returned 1931 results, of which 4 met the inclusion criteria. The implant success rate ranged from 93.8% to 100% over a maximum follow-up of 3 years, with no difference between narrow- and standard-diameter implants. Meta-analysis of all included studies showed greater bone loss in narrow-diameter implants as compared with standard ones; however, when analysis was restricted to randomized trials, no such difference was present.
The meta-analysis showed no difference in longevity between narrow implants and standard implants when supporting single crowns. However, narrow-diameter implants may be associated with greater marginal bone loss. These findings should be regarded cautiously due to the short follow-up duration and methodological heterogeneity of the primary studies.
比较窄径（≤3.3mm）与标准径种植体支持单冠的长期效果和边缘骨吸收情况。
检索 MEDLINE（通过 PubMed）、Scopus 和 SciELO 数据库，查找相关文献。此外，还对检索到的每个种植体公司提供的科学参考文献进行了审查。纳入了比较窄径和标准径种植体之间长期效果和骨吸收差异的干预研究。
搜索仅限于在人体进行的体内研究。查询返回了 1931 项结果，其中 4 项符合纳入标准。在最长 3 年的随访中，种植体成功率范围为 93.8%至 100%，窄径和标准径种植体之间无差异。对所有纳入研究的荟萃分析显示，窄径种植体的骨吸收量大于标准种植体；然而，当分析仅限于随机试验时，两者之间没有差异。
当支持单冠时，荟萃分析显示窄径种植体与标准种植体的长期效果无差异。然而，窄径种植体可能与更大的边缘骨吸收有关。由于主要研究的随访时间短和方法学异质性，这些发现应谨慎对待。
