The influence of crown-to-implant ratio on marginal bone loss: a narrative review

Abstract

Marginal bone loss (MBL) is considered a fundamental criterion for implant success. Many factors may influence MBL, but it is still not clear how MBL is influenced by crown-to-implant ratio (C/ I-R). In addition, the introduction of short implants, to avoid bone augmentation procedure, lead to ratios higher and higher. The aim of this study is to elucidate about the role of high C/I-R on MBL. The articles were identified through MEDLINE database (via PubMed) and checking references. After the selection, 20 articles were included in the review. The highest follow-up among the selected studies was 16 years for the retrospective studies and 5 years for the perspective studies. The highest ratio reported was 2.53. In conclusion, is possible to state that C/I-R not exceed 2.2 did not influence the manifestation of biological complications and lead to a not significant MBL.