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Class II div 2: class II relationship with lingual inclination of upper central incisors (retrocline) and upper lateral incisors overlapping the centrals Class III : The protrusion of the lower jaw with mesiobuccal cusp of maxillary first molar occluding posterior to the buccal groove of the mandibular first molar, with lingually inclined lower ...
Anterior open bite resulted from tongue thrusting in a 24 y.o. patient. Anterior upper teeth are not touching their counterpart. Anterior open bite (AOB) is defined as a condition in which there is no contact and no vertical overlap of the lower incisor crown with the upper incisor crown when the mandible is in full occlusion. [19]
Overbite is the extent of vertical (superior-inferior) overlap of the maxillary central incisors over the mandibular central incisors, [1] measured relative to the incisal ridges. [2] The term overbite does not refer to a specific condition, nor is it a form of malocclusion. Rather an absent or excess overbite would be a malocclusion.
If the lower incisor is anterior to the upper incisors, the overjet is given a negative value. [11] In the UK, an overjet is generally described as increased if it is >3.5 mm (0.14 in). The Index of Orthodontic Treatment Need rates overjet highly on its weighting system, second behind missing teeth. It then grades severity of overjet as: [12]
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]
Serial extraction is a multi-decisional, time linked process. Annual records such as panoramic radiographs, photographs and study models are essential. The most common unfavorable sequel of serial extraction is deepening of bite. Uprighting of incisors and early loss of posterior teeth may result in deep bite.
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]
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.