Читать книгу Basic Guide to Oral Health Education and Promotion - Alison Chapman - Страница 29

There are four types of permanent teeth that make up the secondary dentition (Figure 1.8): incisors, canines, premolars, and molars. Table 1.3 details their notation, approximate exfoliation/eruption dates, and functions. Table 1.4 details the FDI World Dental Federation notation for secondary dentition.

It is important to remember that these exfoliation/eruption dates are only approximate and vary considerably in children and adolescents. The educator should be prepared to answer questions from parents who are worried that their child’s teeth are not erupting at the same age as their friends’ teeth. Parents often do not realise, for example, that no teeth fall out to make room for the first permanent molars (sixes), which appear behind the deciduous molars.

Figure 1.8 Secondary dentition.

Source: From [1]. Reproduced with permission of Elsevier.

Table 1.3 Secondary dentition (notation, approximate exfoliation/eruption dates, and functions).

Tooth	Notation	Approximate exfoliation/eruption dates	Function
First molars	(6)	6–7 years	Chewing
Lower central incisors	(1)	6–7 years	Biting
Upper central incisors	(1)	6–7 years	Biting
Lower lateral incisors	(2)	7–8 years	Biting
Upper lateral incisors	(2)	7–8 years	Biting
Lower canines	(3)	9–10 years	Tearing
First premolars	(4)	10–11 years	Chewing
Second premolars	(5)	11–12 years	Chewing
Upper canines	(3)	11–12 years	Tearing
Second molars	(7)	12–13 years	Chewing
Third molars	(8)	17–24 years	Chewing

Table 1.4 FDI World Dental Federation notation for permanent (secondary) dentition.

Patient’s upper right (1)	Patient’s upper left (2)
18 17 16 15 14 13 12 11	21 22 23 24 25 26 27 28
48 47 46 45 44 43 42 41	31 32 33 34 35 36 37 38
Patient’s lower right (4)	Patient’s lower left (3)