Padhye Ninad Milind, Lakha Tabrez, Naenni Nadja, Kheur Mohit
Ceramco Dental Care, Lokhandwala Complex, Andheri, Mumbai, India.
Department of Fixed and Removable Prosthodontics, M.A. Rangoonwala Dental College and Research Center, Pune, India.
J Oral Biol Craniofac Res. 2020 Oct-Dec;10(4):705-713. doi: 10.1016/j.jobcr.2020.10.002. Epub 2020 Oct 4.
The purpose of the systematic review and meta-analysis was to analyze the existing evidence regarding the effect of crown-to-implant ratio (CIR) on the peri-implant crestal bone level change and implant survival. Randomized controlled clinical trials, prospective as well as retrospective studies with a minimum follow-up period of 12 months and 10 patients per group were included for this systematic review. Statistical analysis was performed to determine CIR effects on the peri-implant marginal bone level changes and implant survival. A total of 28 articles (14 prospective studies and 14 retrospective studies) from a database of 201 articles, with 2097 patients and 4350 implants, were included. A mean CIR ranging from 0.6 to 2.44 was presented by the study groups. A weighted mean implant loss of 0.19% per year and peri-implant marginal bone level change of 0.63 mm ± 0.55 over 46.8 ± 5.2 months was calculated from the included studies. The peri-implant marginal bone level change ( = 0.155) and the rate of implant loss ( = 0.245) showed a statistically insignificant difference between implant restorations of a high (>1.5:1) and low (<1.5:1) CIR. Within its limitations, this review concludes that a high (>1.5:1) or a low (<1.5:1) CIR does not significantly affect the peri-implant marginal bone level change and implant survival rate. However, until further evidence becomes available, extrapolation to long term clinical success cannot be ascertained.
本系统评价和荟萃分析的目的是分析现有证据，以探讨冠根比（CIR）对种植体周围嵴顶骨水平变化和种植体存留率的影响。纳入了随机对照临床试验、前瞻性和回顾性研究，每组至少10例患者，随访期至少12个月，用于本系统评价。进行统计分析以确定CIR对种植体周围边缘骨水平变化和种植体存留率的影响。从201篇文章的数据库中总共纳入了28篇文章（14篇前瞻性研究和14篇回顾性研究），涉及2097例患者和4350颗种植体。研究组的平均CIR范围为0.6至2.44。根据纳入研究计算得出，加权平均每年种植体丢失率为0.19%，在46.8±5.2个月内种植体周围边缘骨水平变化为0.63 mm±0.55。种植体周围边缘骨水平变化（P = 0.155）和种植体丢失率（P = 0.245）在高CIR（>1.5:1）和低CIR（<1.5:1）的种植体修复之间无统计学显著差异。在其局限性范围内，本综述得出结论，高CIR（>1.5:1）或低CIR（<1.5:1）对种植体周围边缘骨水平变化和种植体存留率无显著影响。然而，在获得进一步证据之前，无法确定其对长期临床成功的推断。
