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Class II: The retrusion of the lower jaw with distal occlusion of the lower teeth (or in other words, the maxillary first molar occludes anterior to the buccal groove of the mandibular first molars) [4] Class II div 1: class II relationship with proclined upper central incisors (overjet)
Tanaka and Johnston analysis is a mixed dentition analysis which allows one to estimate the space available in an arch for the permanent teeth to erupt. This analysis was developed by Marvin M. Tanaka and Lysle E. Johnston in 1974 after they conducted a study on 506 orthodontic patients done in Cleveland at the Case Western Reserve University School of Dental Medicine.
Measure widths of each of four permanent incisors of the lower jaw (mandibular central incisor and mandibular lateral incisor). The total Mesio-Distal width of the incisors is calculated; A prediction chart is used for space available in each arch, and the value that matches closest to the sum of incisors is picked.
Universal numbering system. This is a dental practitioner view, so tooth number 1, the rear upper tooth on the patient's right, appears on the left of the chart.
For primary teeth, the sequence of numbers similarly is 5, 6, 7, and 8 for the teeth in the upper right, upper left, lower left, and lower right respectively. When speaking about a certain tooth such as the permanent maxillary central incisor, the notation is pronounced “one, one”. [citation needed]
Distance from upper incisor to NA line: 4 mm L1-NB (degree) Angle between lower incisor to NB line 25 degrees L1-NB (mm) Distance from lower incisor to NB line 4 mm U1-L1 (°) Upper incisor to lower incisor angle 130 degrees L1-Chin (mm) Also known as Holdaway Ratio. It states that chin prominence should be as far away as the farthest point of ...
Class II: The lower incisor edges lie posterior to the cingulum plateau of the upper incisors Division 1 – the upper central incisors are proclined or of average inclination and there is an increase in overjet; Division 2 – The upper central incisors are retroclined. The overjet is usually minimal or may be increased. Class III: The lower ...
There are 20 primary teeth and they typically erupt in the following order: (1) central incisor, (2) lateral incisor, (3) first molar, (4) canine, and (5) second molar. [13] As a general rule, four teeth erupt for every six months of life, mandibular teeth erupt before maxillary teeth, and teeth erupt sooner in females than males. [14]