The roots of the primary molars are longer and ________ compared to permanent molars.

• A. Wider
• B. Flatter
• C. Flare
• D. Shorter

Answer: (C)

The roots of primary molars are indeed longer and flare compared to those of permanent molars. This flaring allows for the roots to accommodate the developing permanent teeth that are situated beneath them. In children, the larger body of the primary molars also necessitates this root flaring so that there is adequate space for the successor teeth.

In contrast, permanent molars have roots that are typically shorter and more parallel or closer together, which strengthens their anchorage in the denser bone structure of older children and adults. The longer and flaring roots of primary molars offer the support needed during the early stages of dental development as the mouth is still undergoing significant anatomical changes. Therefore, the flaring nature of the roots is a key distinguishing characteristic that aids in the proper alignment and eventual eruption of the permanent successors.