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. 2022 May 10;22:171. doi: 10.1186/s12903-022-02187-1

Table 1.

Distribution of maxillary and mandibular anterior teeth according to Vertucci and the new classification system (NC = Non-classifiable)

Teeth position (n = 570)	Vertucci classification				New classification system
Teeth position (n = 570)	Type I	Type III	Type IV	NC	¹TN¹	¹TN^1-2-1	¹TN^1-2	¹TN^1-2-1-2-1
Maxillary
Central incisors	558	12			558	12
Lateral incisors	557	13			557	13
Canines	559	11			559	11
Mandibular
Central incisors	489	74	7		489	74	7
Lateral incisors	391	144	35		391	144	35
Canines	515	40	14	1	515	40	14	1