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In such a case LLA prevents the permanent molars from migrating mesially (forward) thus blocking off the eruption space for the premolar teeth. LLA is also used in order to maintain the so-called "Leeway space", which is the extra space available in the arch when the deciduous molars are exfoliated and replaced by smaller permanent premolars. [1]
When exploring different complete denture occlusal schemes, it is more useful to define occlusion as the relative movement of one object to another viz the dynamic relationship between mandible to the maxillae during function. Bilateral balanced occlusion and non-balanced occlusion are two separate entities that make up complete denture occlusion.
Leeway space is the size differential between the primary posterior teeth (C,D,E) and the permanent teeth (canine, first and second pre-molar). Maxillary space of 1.5mm, mandibular 2.5mm can be seen. Maxillary space of 1.5mm, mandibular 2.5mm can be seen.
The most common cause of unilateral crossbite is a narrow maxillary dental arch. This can happen due to habits such as digit sucking, prolonged use of pacifier or upper airway obstruction. Due to the discrepancy between the maxillary and mandibular arch, neuromuscular guidance of the mandible causes mandible to shift towards the side of the ...
Maxillary (upper) complete denture posterior extension: vibrating line (i.e. the intersection between the soft and hard palate). The landmarks for the vibrating line are the fovea palatinae (collecting ducts of minor salivary glands) that can be seen as two concavities on the mucosa. Extending the maxillary denture to the vibrating line ensures ...
Between the two surgeries, a patient's constricted maxillary arch is expanded with the rapid maxillary expander device placed in the maxilla. For the first surgery, under local anaesthesia and iv sedation or general anesthesia , a patient first goes through Le Fort fracture of skull without the downfracture of maxilla.
These appliances can be used to achieve expansion in the maxillary arch; there are devices for mandibular expansion or lower expansion too. In past many years, different types of appliances have been made. These types are: tissue-borne, tooth-borne, slow maxillary expansion, rapid maxillary expansion, and bone-anchored.
The maxillary second molar is the tooth located laterally from both the maxillary first molars of the mouth but mesially from both maxillary third molars. This is true only in permanent teeth. In deciduous teeth, the maxillary second molar is the last tooth in the mouth and does not have a third molar behind it.