Question

explain how the sequence of eruption of permanent dentition plays a role in the establishment of a normal occlusion

Answer 1

Occlusion is defined as the way the teeth meet when mandible and maxilla come together. Normal occlusion occurs when the mesiobuccal cusp of the upper first molar is received in the buccal groove of the lower first molar. Dental formula for prmanant dentition is 2(i)1(c)2(p)3(m). The most common sequences of eruption in the maxilla are 6-1-2-4-3-5-7-8 and 6-1-2-4-5-3-7-8. The most common sequences for the mandibular arch are (6-1)-2-3-4-5-7-8 and (6-1)-2-4-3-5-7-8. In each arch there are two central incisors, two lateral incisors, two canines, four premolars, and six molars. The permanent central incisors, lateral incisors, canines, and first and second premolars replace the primary dentition. The primary molars are replaced with the permanent premolars, and the permanent molars erupt posterior to those.  The first permanent molars play an important role in the establishing and in the functioning of occlussion .According to Angle, the mesiobuccal cusp of the maxillary first molar aligns with the buccal groove of the mandibular first molar. The maxillary canine occludes with the distal half of the mandibular canine and the mesial half of the mandibular first premolar. The teeth all fit on a line of occlusion which, in the upper arch, is a smooth curve through the central fossae of the posterior teeth and cingulum of the canines and incisors, and in the lower arch, is a smooth curve through the buccal cusps of the posterior teeth and incisal edges of the anterior teeth.

There is alignment of the teeth, normal overbite and overjet and coincident maxillary and mandibular midlines.