Oral Restorative Sciences Department, Westmead Centre for Oral Health, Darcey Road, Westmead, 2145, Australia.
Lecturer, Sydney Dental School, The University of Sydney, NSW 2006 Australia.
Eur J Prosthodont Restor Dent. 2021 Nov 29;29(4):194-207. doi: 10.1922/EJPRD_2146Soliman14.
To appraise the effect of abutment factors namely platform switching, design and connection protocols on the stability of peri-implant tissues.
An electronic and hand search were conducted. Randomized control trials and controlled prospective studies of at least one-year follow-up, published in the last 12 years, were included.
Initial electronic database search generated 3054 studies, while individual journal and hand searching resulted in 232 articles. Sixty-three publications were selected for full text analysis based on inclusion and exclusion criteria. Nineteen articles investigated platform switching. Fourteen studies reported positive influence of platform switching while five studies did not find a significant difference in bone loss compared to platform matched abutments. Two articles reported on concave abutments and found no advantage over conventional abutments. Seven studies investigated "one-abutment-one-time protocol", two found comparable results to multiple abutment disconnections while five studies suggested better soft and hard tissue maintenance. The risk of bias was unclear or high in most studies.
Platform switched abutments may reduce crestal bone loss during the first year. There is insufficient evidence to suggest better clinical outcomes of concave abutment. There is insufficient evidence to indicate the superiority of 'one abutment-one-time protocol'.
评估基台因素（即平台转换、设计和连接方案）对种植体周围组织稳定性的影响。
进行了电子和手工搜索。纳入了发表在过去 12 年中至少随访一年的随机对照试验和对照前瞻性研究。
最初的电子数据库搜索产生了 3054 项研究，而个别期刊和手工搜索则产生了 232 篇文章。根据纳入和排除标准，对 63 篇出版物进行了全文分析。19 篇文章研究了平台转换。14 项研究报告了平台转换的积极影响，而 5 项研究发现与平台匹配基台相比，骨丢失没有显著差异。两篇文章报道了凹面基台，发现与传统基台相比没有优势。有 7 项研究调查了“一个基台一次连接方案”，其中两项发现与多个基台断开连接的结果相当，而五项研究表明该方案更有利于软组织和硬组织的维护。大多数研究的偏倚风险不明确或较高。
平台转换基台可能会减少第一年的牙槽嵴骨丢失。没有足够的证据表明凹面基台具有更好的临床效果。没有足够的证据表明“一个基台一次连接方案”具有优越性。
