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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]
The word derives from mal- 'incorrect' and occlusion 'the manner in which opposing teeth meet'. The malocclusion classification is based on the relationship of the mesiobuccal cusp of the maxillary first molar and the buccal groove of the mandibular first molar. If this molar relationship exists, then the teeth can align into normal occlusion.
The human dentition consists of 32 permanent teeth and these are distributed between the alveolar bone of the maxillary and mandibular arch. Teeth consist of two parts: the crown, which is visible in the mouth and lies above the gingival soft tissue and the roots, which are below the level of the gingiva and in the alveolar bone.
In dentistry, crossbite is a form of malocclusion where a tooth (or teeth) has a more buccal or lingual position (that is, the tooth is either closer to the cheek or to the tongue) than its corresponding antagonist tooth in the upper or lower dental arch. In other words, crossbite is a lateral misalignment of the dental arches. [1] [2]
The aim when creating the index was to allow for a system in measuring occlusion which can be easily comparable. The five major groups which are recorded are as follows: 1. Gross Anomalies 2.Dentition: absent teeth, supernumerary teeth, malformed incisors and exotic eruption 3.Spaced condition: Diastema, Crowding and Spacing 4.Occlusion:
That being a disease, and that malocclusion and dental crowding is a feature of tooth number redundancy, or oversize of permanent teeth, that epidemiological studies of the natural rates of the various classification states can be made. 5. That there are no other common associated features of malocclusion outside of the dental relationship.
[10] In conclusion, an ideal occlusion is set by various groups based on a hypothetical assumption. While, questioning this concept may be ignorant, criticizing this technique does not mean it does not work on a clinical level. Other studies show that there is another occlusion scheme that can be considered in place of the balanced occlusion ...
Normal occlusion is Class I occlusion. When the teeth are biting down, the maxillary central incisors occlude with the mandibular central and lateral incisors. The contact point of the mandibular teeth is in the lingual fossa of the maxillary central incisor about 4 mm gingivally from the incisal edge. [18]