Angle Classification
A system devised by Edward Angle that categorises malocclusion into Class I, II, or III based on the molar relationship and jaw position.
Full Definition
The Angle Classification system, introduced by Edward H. Angle in 1899, divides malocclusions into three primary classes based on the relationship of the upper and lower first permanent molars. Class I indicates a normal anteroposterior jaw relationship with localised tooth irregularities; Class II indicates the lower molar is distal to the upper; Class III indicates the lower molar is mesial to the upper. Subdivisions (e.g. Class II Division 1, Division 2) further refine the diagnosis. Editors must render class numerals in Roman numerals and subdivisions in Arabic numerals per orthodontic convention.
Usage
Usage note: Always use Roman numerals for the class (I, II, III) and Arabic numerals for subdivisions (1, 2). Do not write 'Class 2' in formal clinical or academic documents.
In Context
- "The patient presented with an Angle Class II Division 1 malocclusion and increased overjet." — Clinical case report
- "Angle Classification is recorded at the initial examination and reviewed at each treatment milestone." — Treatment planning notes