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The coronal incision is considered the most effective for optimal exposure of frontal sinus fractures due to its anatomical advantages. This incision runs along the hairline across the forehead and allows the surgeon to gain direct access to the frontal sinuses and the surrounding structures without disturbing facial aesthetics significantly.

The coronal approach provides good visibility and facilitates the necessary dissection for addressing fractures that may involve both the frontal sinus and surrounding facial structures. The elevation of the scalp flap preserves the pericranium, which can later enhance healing in this area.

In contrast, submental and transverse incisions do not provide adequate access to the frontal area, making them less suitable for such fractures. The midline incision may allow access to certain midline structures but lacks the specific exposure needed for frontal sinus assessment and repair. Thus, the coronal incision remains the preferred choice in this context.