Maxillary Deficiency
A skeletal condition in which the maxilla is underdeveloped or posteriorly positioned relative to the cranial base, typically resulting in a concave facial profile and Class III tendency.
Full Definition
Maxillary deficiency is characterised by insufficient forward development of the maxilla, reflected by a reduced SNA angle on cephalometric analysis. It is a common component of Class III skeletal malocclusion and produces a concave or midface-deficient soft-tissue profile. In growing patients, forward protraction of the maxilla with a facemask is the primary treatment approach. In skeletally mature patients, Le Fort I osteotomy with advancement is required. Editors should differentiate 'maxillary deficiency' from 'mandibular excess,' as both can produce a Class III facial appearance but require different treatment strategies; the terms must not be used interchangeably.
Usage
Usage note: Specify whether the deficiency is sagittal, vertical, or transverse to avoid ambiguity in surgical planning documents.
In Context
- "Sagittal maxillary deficiency was the primary skeletal component contributing to the Class III malocclusion." — Orthodontic case summary
- "The team agreed that the degree of maxillary deficiency precluded a camouflage approach in this adult patient." — Multidisciplinary meeting notes