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Class I with severe crowding and labially erupted canines Class II molar relationship. Edward Angle, who is considered the father of modern orthodontics, was the first to classify malocclusion. He based his classifications on the relative position of the maxillary first molar. [33]
Angle's Classification is devised in 1899 by father of Orthodontic, Dr Edward Angle to describe the classes of malocclusion, widely accepted and widely used since it was published. Angle's Classification is based on the relationship of the mesiobuccal cusp of the maxillary first molar and the buccal groove of the mandibular first molar. [3]
Class 3 elastics are used when the molar relationship is close to Class 1 malocclusion. Class 3 malocclusions due to skeletal discrepancy (mandibular prognathism) cannot be corrected with Class 3 elastics. [8] It is important to evaluate soft tissue and hard tissue esthetics of a patient
Class II and III molar and incisor relationships are thought to be forms of malocclusion, however not all of these are severe enough to require orthodontic treatment. The Index of Orthodontic Treatment Need is a system that attempts to rank malocclusions in terms of significance of various occlusal traits and perceived aesthetic impairment. [ 11 ]
This incisal relationship is where there is virtually no incisal overjet, and a very deep incisal overbite, and is always associated with a class II molar relationship. In essence, Class II Div 2 malocclusion is a common description given to extreme crowding, or backward collapse of the anterior teeth and is a common presenting complaint by ...
The anterior ratio is known to be 77.2%. An overall ratio of more than 91.3% means that the mandibular teeth are bigger when compared to normal. A ratio smaller than 91.3% would mean the mandibular teeth are smaller than normal. Anterior analysis follows the same principle. Having a different ratio than normal is referred to as Bolton Discrepancy.
Its clinical significance is that in a Class 2 skeletal patient, AO is located ahead of BO. In skeletal Class 3 patient, BO is located ahead of AO. Therefore, the greater the wits reading, the greater the jaw discrepancy. Drawbacks to Wits analysis includes: [18] Left and Right molar outlines may not always coincide
The molar conductivity of an electrolyte solution is defined as its conductivity divided by its molar concentration. [1] [2] =, where: κ is the measured conductivity (formerly known as specific conductance), [3] c is the molar concentration of the electrolyte.