Molar relation in primary dentition is determined by:

 # Molar relation in primary dentition is determined by:

A. Mesiobuccal cusp of maxillary first molar

B. Buccal groove of mandibular first molar

C. Distal surface of maxillary and mandibular second molar

D. Distal surface of maxillary and mandibular first molar

The correct answer is:

C. Distal surface of maxillary and mandibular second molar

Explanation:

In primary dentition, the molar relationship is determined by the alignment of the distal surfaces of the maxillary and mandibular second molars. This is used to describe the primary occlusion as either:

Flush terminal plane: The distal surfaces of the second molars are aligned in a straight plane.

Mesial step: The mandibular second molar’s distal surface is mesial to the maxillary second molar’s distal surface.

Distal step: The mandibular second molar’s distal surface is distal to the maxillary second molar’s distal surface.

These relationships are important because they influence the development of the permanent molar occlusion.