In Angle’s classification, what is the primary feature of Class II Division 1?

In Angle’s classification, Class II Division 1 is characterized primarily by protruded incisors. This classification indicates that the first molars are in a specific position (the first molar of the lower jaw is positioned further back than the first molar of the upper jaw), and notably, the upper incisors are positioned more facially and are often protruded. As a result, individuals with this classification often display a distinct appearance of the front teeth, which can significantly affect their smile and facial aesthetics.

While deep overbite is indeed a component associated with Class II malocclusion, it is particularly emphasized in Division 1 when the incisors are protruded. This is what distinguishes Class II Division 1 from Class II Division 2, where the incisors are retroclined. Dental crowding and open bite are not defining features of Class II Division 1; these issues can be found across various malocclusions but do not uniquely characterize this specific class.