1317. Which of the following is true of permanent first molar’s occlusal surface_____________?

A. Maxillary molar has 2 major fossa, 2 minor fossa, 4 triangular ridges,1 oblique ridge and 5 grooves
B. Mandibular molar has 1 major fossa, 2 minor fossa, 5 triangular ridges and 4 grooves
C. Rhomboidal shape in maxillary molars and hexagonal shape in Mandibular molars
D. All of the above
✅ The correct answer is option D. All of the above.

1318. The incisal edges and the incisal thirds of facial surfaces of mandibular incisors and canines generally oppose lingual surfaces of maxillary incisor and canines _____________?

A. Within the incisor thirds
B. At the junction of middle and cervical thirds
C. At the linguo cervical ridges
D. Immediately incisal to cingulam
✅ The correct answer is option A. Within the incisor thirds.