What is the difference between Class 2 Division 1 and 2?

The class II division 2 differs from division 1 by the following characteristic: the discrepancy between the upper and lower teeth does not match the discrepancy between the upper and lower teeth where the molars and canines are located (red and blue arrows).

What is Class 2 Div 2 Dentistry?

A Class II incisor relationship is defined by the British Standards classification as being present when the lower incisor edges occlude posterior to the cingulum plateau of the upper incisors. Class II division 2 includes those malocclusions where the upper central incisors are retroclined.

What is a Class 2 Div 1?

The patients with Class II division 1 malocclusion often have problems in both dental tissue and facial soft tissues, typically the protrusion of upper incisors and lip, which could have impact on facial esthetics.

What is a Class II occlusion?

Class II occlusion occurs when the lower dental arch is posterior (more towards the back of the mouth) than the upper one. In this malocclusion, the upper front and maxillary teeth project more forward than the lower teeth and the jaw.

Is Class 1 occlusion normal?

Normal occlusion: The mesiobuccal cusp of the upper first molar occludes with the buccal groove of the lower first molar. Class I malocclusion: Same as normal occlusion but characterized by crowding, rotations, and other positional irregularities.

Does Class 1 Div 1 require explosion-proof?

While Division 1 motors in Class I locations must be explosion-proof, Class II, Division 1 motors must be dust- ignition-proof. The characteristics of dust-ignition-proof motors differ from those of their Class I counterparts.

Is Class I Div 2 explosion-proof?

A Class I Division 2 light are not held to as high of a standard as Division 1 products. To meet the requirements for Division 2, a light does not have to be able to contain an explosion. Instead, they must be found to be unable to cause an explosion in environments for which they are approved to be used.

What is a Class 1 incisor relationship?

Class 1: Class I is a normal relationship between the upper teeth, lower teeth and jaws or balanced bite. Normal. Crowding. Spacing.