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The aberrant molar
From Volume 11, Issue 2, April 2018 | Pages 55-60
Article
The molar teeth are unique in that they are accessional teeth, ie they do not have a primary precursor. The eruption of the first permanent molar marks the beginning of the mixed dentition phase of development. This is the first accessional tooth to erupt and is followed by the eruption of upper and lower incisors, premolars and canines (successional teeth). The eruption of the second molar marks the establishment of the permanent dentition, which may be completed with the eruption of the third molar (if present). Abnormalities of eruption are common in the case of the third molar and less so in the case of the first and second molars.
The first molar begins calcification at birth and erupts at roughly 6 years of age. As with most permanent teeth, the lower molar usually erupts just before the upper molar. The second molars begin to calcify at 3 years of age and erupt at about 12 to 14 years. The third molars may be visible radiographically between the ages of 8 to 14 years old and usually erupt between the ages of 17 to 25 years. They are the least predictable teeth in terms of their morphology and behaviour.
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