State of the art of biological thickness in deep margin restorations

Today, the technique of gingival margin elevation is part of a possible conservative and predictable rehabilitation for the replacement and improved adaptation of subgingival restorations. However, the invasion of the biological space can lead to pathologies within the surrounding tissues and bone resorption. Therefore, the aim of this study is to review the state of the art regarding the biological width of natural teeth and teeth with deep margin elevation (DME). This study is conducted through a narrative review of the literature, searching the bibliographic libraries of Science Direct and PubMed. Articles were selected based on inclusion and exclusion criteria. From the initial search, 90 articles were obtained, of which 37 were selected. The results of these articles indicate that as long as the biological width is 3mm, a penetration of up to 0.5mm can be performed without long-term repercussions. Therefore, this procedure can be safely performed as long as appropriate management of the biological width and patient cooperation are ensured. Dental professionals can effectively approach cases of deep margin elevation and ensure oral health.