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Updated: Oct 17, 2025

Meta-analysis of Voxel-Based Neuroimaging Studies using Seed-based d Mapping with Permutation of Subject Images SDM-PSI
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The Dahl Concept: Best Evidence Consensus Statement.

Gary Goldstein1, Stephen Campbell2

  • 1Professor Emeritus, New York University, New York, NY.

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists
|October 9, 2021
PubMed
Summary
This summary is machine-generated.

The Dahl Concept, an orthodontic technique for severe anterior tooth wear, shows limited evidence for achieving restorative space. Long-term stability and outcomes remain unsupported by robust scientific data.

Keywords:
Dahl ApplianceDahl Conceptanterior tooth wearextrusionintrusion

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Area of Science:

  • Dentistry
  • Orthodontics
  • Restorative Dentistry

Background:

  • The Dahl Concept is an orthodontic technique proposed for treating severe anterior tooth wear.
  • This technique reportedly aims to create restorative space by intruding anterior teeth and extruding posterior teeth.

Purpose of the Study:

  • To evaluate the existing dental literature concerning the Dahl Concept.
  • To assess the evidence supporting the efficacy and stability of the Dahl Concept in orthodontics.

Main Methods:

  • A systematic literature search was conducted using PubMed.
  • Keywords included Orthodontics, Dahl appliance, Dahl concept, and adult.
  • The search was limited to clinical studies, trials, reviews, and meta-analyses, supplemented by reference list reviews.

Main Results:

  • Twenty articles were evaluated, with the literature primarily focusing on restorative materials used in the Dahl technique.
  • Case series provided low-level evidence suggesting the technique can create anterior space for restorations.

Conclusions:

  • There is a lack of compelling evidence to explain the mechanism by which the Dahl Concept achieves space.
  • The long-term stability of tooth position and restorations following the Dahl Concept is not supported by evidence.
  • Negative outcomes regarding tooth position and restorations have been reported.