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Meta-Analysis
. 2023 Feb 1;41(1):80-87.
doi: 10.7518/hxkq.2023.01.011.

Clinical efficacy of extra-short implant (4 mm) placed in posterior areas: a Meta-analysis

[Article in English, Chinese]
Qihang Zhang  1 , Jiaming Gong  2 , Jiaying Yu  1 , Ruimin Zhao  2 , Ping Gou  1 , Zhanhai Yu  1
Affiliations
Meta-Analysis

Clinical efficacy of extra-short implant (4 mm) placed in posterior areas: a Meta-analysis

[Article in English, Chinese]
Qihang Zhang et al. Hua Xi Kou Qiang Yi Xue Za Zhi. .

Abstract
in English, Chinese

Objectives: This study aimed to systematically evaluate the safety and clinical efficacy of 4 mm-extra-short implant (ESI) placement in severely atrophic posterior areas.

Methods: Databases of PubMed, Embase, Cochrane Library, Web of Science, CNKI, and Wanfang from January 1, 2010, until August 31, 2022, were searched to identify randomized controlled trials or controlled clinical trials related to ESI and standard implants (SI). An additional hand search of the references of included articles was also conducted. Meta-analyses were carried out with RevMan 5.4 software.

Results: A total of 11 studies were included, involving six randomized controlled trials and five controlled clinical trials. The meta-analyses indicated that when implants were placed in the posterior area, the implant survival rate between ESI and SI did not significantly differ [RR=1.23, 95%CI (0.66, 2.27), P=0.52]. ESI resulted in significantly stable marginal bone level [MD=-0.16, 95%CI (-0.25,-0.07), P=0.000 7] and less biological complications [RR=0.34, 95%CI (0.19, 0.62), P=0.000 4] but more mechanical complications [RR=2.89, 95%CI (1.05, 7.92), P=0.04].

Conclusions: Based on the limited evidence, ESI could achieve clinical outcomes similar to those of SI when the height of the posterior alveolar bone is less than 5 mm, with lower technical sensitivity and fewer postoperative clinical complications than SI. Due to insufficient evidence and limited sample size, further clinical trials are needed to verify the long-term efficacy of ESI.

目的: 通过系统评价及Meta分析的方法评估在后牙区骨量不足植入4 mm超短种植体（ESI）的安全性和效用。方法: 电子检索2010年1月1日—2022年8月31日PubMed、Embase、Cochrane Library、Web of Science、CNKI、万方数据库有关ESI与标准种植体（SI）（≥8 mm）的随机对照试验或临床对照试验，并进行引文检索。应用RevMan 5.4版软件进行Meta分析。结果: 共11篇研究符合纳入标准，其中随机对照试验6篇，临床对照试验5篇。Meta分析结果：在后牙区种植时，ESI与SI的存留率差异无统计学意义［RR=1.23，95%CI（0.66，2.27），P=0.52］；ESI表现出更稳定的边缘骨水平［MD=-0.16，95%CI（-0.25，-0.07），P=0.000 7］，更少的生物并发症［RR=0.34，95%CI（0.19，0.62），P=0.000 4］，然而机械并发症更多［RR=2.89，95%CI（1.05，7.92），P=0.04］。结论: 基于有限的证据，在后牙牙槽嵴高度低于5 mm时应用ESI可以获得媲美SI的临床效果，且具备技术敏感性低、术后生物并发症少等优势。由于ESI长期随访证据不足、样本量有限，仍需要更多临床试验评估ESI的长期效用。.

Keywords: Meta-analysis; complications; extra-short implant; marginal bone resorption; standard implant; survival rate.

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Conflict of interest statement

利益冲突声明：作者声明本文无利益冲突。

Figures

图 1
图 1. 种植体存留率的Meta分析
Fig 1 Meta-analysis of implant survival rate
See this image and copyright information in PMC

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