1. Primary teeth are less mineralized than permanent teeth and consequently are more easily worn
2. The difference in space from the primary to the permanent dentition is 2-4mm.
3. Mamelons that remain beyond the age of 10 – generally indicate an open bite
4. Calcification of the primary roots is normally completed at 3-4 years of age.
5. Usual pattern of eruption for primary teeth is centrals, laterals, 1st molars, canines, 2nd molars.
6. Primate space- maxillary: btn lateral incisor and canine
7. Mandibular: btn canine and first molar.
8. Primary spacing for the anterior teeth – Most frequently caused by growth of the dental arches
9. Direction of primary enamel rods in the cervical third is in an occlusal direction.
10. Primary molars differ from the permanent molars in that their roots are more divergent.
11. Primary molar lacks an identifiable root trunk.
Primary Central incisor
12. Primary mandibular central incisor has the smallest F-L crown dimension
13. Primary and permanent mandibular central incisor – most bilaterally symmetrical tooth
14. In delayed resorption of primary incisors the permanent incisors usually erupt lingually (Shark teeth)
15. Primary central incisor exhibits a prominent cervical ridge both on the facial and lingual surfaces.
16. From a facial view, the crown of a primary canine has a mesioincisal slope longer than the distoincisal.
17. Cusp tip of the primary canine is generally offset to the distal Primary Maxillary fist molar
18. Primary Max 1st molar has a crown that somewhat resembles a permanent premolar
19. Primary Max 1st molar has roots that resemble a typical permaenent maxillary molar D
20. The cervical ridge is most prominent for primary maxillary teeth (Attention!) on the mesiofacial surface of the 1st molar