Varthis S, Tarnow D P, Randi A. J Prosthodont 2018; DOI: 10.1111/jopr.12980. [Epub ahead of print].

This study aimed to determine the prevalence and contributing factors of interproximal contact loss (ICL) between implant restorations and adjacent teeth as well as provide recommendations for prevention and treatment. A literature search on PubMed revealed seven studies showing a high prevalence of ICL between implant prostheses and adjacent teeth. ICL was greater in the mesial aspect compared with the distal. ICL in the maxilla ranged between 18% and 66% versus 37% to 54% in the mandible. ICL might occur as early as three months after prosthetic treatment. Documented possible causes included: tooth migration, crown-related and bone formation/growth-related. The authors explained that the clinical condition will dictate if the implant crown needs to be modified/replaced or the natural tooth restored to re-establish the interproximal contact. Periodic evaluations and the use of screw-retained restorations due to ease of removal is recommended to diagnose and mitigate the problem. An orthodontic retainer or occlusal guard might also help.