Goldstein G, Campbell S. The Dahl Concept: Best Evidence Consensus Statement. J Prosthodont 2021; doi: 10.1111/jopr.13441. Online ahead of print.

While there is low-level evidence from a few case series that demonstrated the ability to achieve enough space in the anterior region for the restoration of lost anterior tooth structure, there is no compelling evidence to support any theories as to how that space was achieved.

The purpose of this Best Evidence Consensus Statement was to evaluate the existing dental literature related to the Dahl Concept. A PubMed search was limited to clinical studies, clinical trials, randomised controlled trials, systematic reviews, meta-analyses and journal articles. The 20 articles that met the initial search criteria were evaluated and rated. The literature largely focused on the restorative materials that are commonly used to apply the Dahl technique. While there is low-level evidence from a few case series that demonstrated the ability to achieve enough space in the anterior region for the restoration of lost anterior tooth structure, there is no compelling evidence to support any theories as to how that space was achieved. In addition, there is no evidence to support the long-term stability of that position and the restorations.