<prompt> A 29 year old male patient complains of protruding upper incisors. The incisor relationship can be classified as Class II div 1. This system of classification for incisor relationship was described by:E. AngleBritish Standards InstituteAckerman-Proffit systemDewey  <response>: British Standard Classification of Incisor Malocclusion:Class I: The lower incisor edges occluded on or lie below the cingulum plateau of the upper incisors. Class II, division 1: The lower incisor edges occluded behind the cingulum plateau of the upper incisors and the upper incisors are normally inclined or proclined. Class II, division 2: The lower incisor edges occluded behind the cingulum plateau of the upper incisors and the upper incisors are retroclined. Class III: The lower incisor edges occlude anterior to the cingulum plateau of the upper incisors.Ref: British Standards Institute. Glossary of Dental Terms BS 4492. London: BSI; 1983. 