The anteroposterior component of PIP in Class II treatment

Traditionally in orthodontics the upper incisor A/P position has been related to the APo line with a conventional cephalometric value of+6 mm (Fig. 7.10). The Arnett analysis relates upper incisor position to a true vertical line (TVL), and uses the term MXI-TVL, which is the linear measurement from the tip of the upper incisor to the true vertical line. The male upper central incisor tip is ideally -12 mm to the line and the female is at -9 mm (Fig. 7.11).

APo +6mm

Fig. 7.10 In traditional orthodontic treatment planning, upper incisor position has been related to the APo line, with no difference in the normals between males and females.

APo +6mm

Fig. 7.10 In traditional orthodontic treatment planning, upper incisor position has been related to the APo line, with no difference in the normals between males and females.

Fig. 7.11 The Arnett analysis relates upper incisor position to a true vertical line (TVL) and requires different ideals for males and females.

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