Mesial Drift
The natural tendency of teeth to migrate toward the midline (mesially) over time, driven by interproximal wear and occlusal forces.
Full Definition
Mesial drift is a physiological phenomenon in which teeth gradually migrate in a forward (mesial) direction throughout life. It is attributed to a combination of factors including interproximal attrition, the anterior component of occlusal force, and the transseptal fibre system of the periodontal ligament. In orthodontic practice, mesial drift is clinically significant because it can close residual extraction spaces, compromise anchorage, and contribute to crowding if unarrested. Editors should note that 'mesial' (towards the midline along the dental arch) is frequently confused with 'medial' (towards the midline of the body) in non-specialist writing.
Usage
Usage note: Do not confuse 'mesial' (along the dental arch toward the midline) with 'medial' (toward the body midline). This is a frequent error in non-specialist editorial work.
In Context
- "Mesial drift of the lower molars was observed following premature loss of the deciduous second molar." — Clinical case notes
- "Without a space maintainer, mesial drift would compromise the eruption path of the first premolar." — Treatment planning letter