Tooth
(years)
Average Lenth of crown (mm)
Average Length of
Root (mm)
1st evidence of calcification
Crown done
(yrs)
Age of emergence in oral cavity(yrs)
Root
Done
(yrs)
Mandibular 3rd molar
7.0
6.5
7-9
12-16
17-21
18-25
Maxillary 3rd molar
11.0
11.0
8-10
12-16
17-21
18-25
mm = millimeters, yrs = years
Table 2:
Average Length of Crown and root (millimetres) and Chronology of development of maxillary and mandibular third molars (years) by Wheeler RC et al
.
