Bite Classifications

Understanding bite classifications is essential in dentistry. This classification system is primarily based on the alignment of the first permanent molars in centric occlusion, influenced by the skeletal relationship between the maxilla, mandible, and cranial base. A comprehensive diagnosis and treatment plan necessitate assessing dental and skeletal conditions in all spatial planes.

Dr. Edward Angle, born in 1855, revolutionized orthodontics and introduced a foundational classification system. Angle's system categorizes malocclusions into three main classes:

Class I:

Ideal occlusion, according to Dr. Angle, is marked by the alignment of the first molars, where the upper mesio-buccal cusp fits precisely into the lower buccal groove. This alignment signifies a Class I occlusion, characterized by a proper molar relationship. Additionally, in Class I, the upper canine cusp aligns with the space between the lower canine and first premolar.

Class II:

A Class II malocclusion occurs when the upper first molar's mesio-buccal cusp lies anterior to the lower molar's buccal groove. This positioning results in a distal (posterior) placement of the lower molar's buccal groove concerning the upper molar's cusp. Class II malocclusions are further subdivided based on the position of the incisors:

• Division 1: Protrusion of upper anterior teeth with a large overjet.
• Division 2: Retroclination of upper anterior teeth with a deep overbite.

Aligners combined with sequential distalization and Class II elastics can effectively treat Class II malocclusions of up to 3 mm.

Class III:

In Class III malocclusions, the upper first molar's mesio-buccal cusp is distally positioned compared to the lower molar's buccal groove. Similarly, the upper canine cusp lies distally concerning the space between the lower canine and first premolar. Treatment strategies for Class III malocclusions depend on whether a skeletal component is present, typically involving interproximal reduction (IPR), retroclination of lower incisors, proclination of upper incisors, and the use of Class III elastics.