4 root canals (MB1 & MB2)
Palatal root canal: C-shaped, curvature approx. 15°
Distobuccal root canal: S-shaped – first curvature approx. 20°, second more pronounced at approx. 30°
Mesiobuccal root canals (MB1 & MB2): C-shaped, curvature approx. 15°
Root canal length: 12–13 mm
Root canal diameter: 0.20–0.15 mm