Which statement correctly describes fusion and gemination in tooth development?

• A. Fusion results in a higher tooth count than normal.
• B. Fusion is the union of two tooth buds forming a single tooth with reduced tooth count; gemination is a single tooth bud attempting to split, resulting in a bifid crown.
• C. Gemination results in the union of two adjacent teeth.
• D. Fusion and gemination refer to enamel hypoplasia.

Answer: (B)

Fusion and gemination involve abnormal development of tooth buds, and the key way to tell them apart is by tooth count and how the process appears clinically. Fusion happens when two tooth buds join to form one tooth, so the total number of teeth in the arch is reduced. Gemination occurs when a single tooth bud tries to split into two, producing a bifid or partially split crown, but the overall tooth count remains the same because you’re not creating an extra tooth. Radiographs help confirm the pattern: fusion may show two root systems or a tooth with fused roots, whereas gemination usually shows a broad or split crown with a single root and canal. This aligns with the correct statement, while the other options misstate either the effect on tooth count, the nature of the union, or the relation to enamel hypoplasia.