2454. The root trunk of permanent mandibular first molar buccally is______________?

A. Equal is length to the mesial bifurcation of the maxillary first molar
B. Equal is length to the buccal bifurcation of the maxillary first molar
C. equal in length to the crown
D. None of the above
✅ The correct answer is option A. Equal is length to the mesial bifurcation of the maxillary first molar.

2460. All of the following statements are true for zinc oxide eugenol cements except______________?

A. Equal lengths of base paste and accelerator paste are mixed together until the mix has a uniform colour
B. Increase in temperature and humidity shorten the setting time
C. The mix appear thick at the start of mixing but after 30 seconds of additional spatulation it becomes more fluid
D. Water accelerates but heat retards the setting of zinc oxide eugenol cements
✅ The correct answer is option E. Both C & D.