Upper lateral incisor unilateral agenesis is best characterized by which statement?

Upper lateral incisor unilateral agenesis is best characterized by which statement?

• A. Long persistence of the temporary teeth on the arches
• B. Early extraction of temporary teeth is necessary
• C. Mesial movement of teeth is possible at any age
• D. Extraction of the opposite lateral incisor is not obligatory

Answer: (A)

The key idea is how missing a permanent upper lateral incisor alters eruption in that segment. When a lateral incisor is absent, there’s no tooth to replace it, so the eruption pattern is disrupted and the deciduous teeth in that area tend to stay in place longer than normal. This prolonged persistence of the deciduous dentition on the affected side is a characteristic sign of unilateral upper lateral incisor agenesis, and it shapes how the space and alignment are planned for treatment. Early extraction of the deciduous teeth isn’t typically required and can even complicate timing for subsequent orthodontic guidance. The notion of teeth mesially drifting at any age isn’t a defining feature, since movement depends on available space and treatment context rather than a universal rule. Extraction of the opposite lateral incisor isn’t obligatory either; that decision depends on overall symmetry and treatment goals, not on the mere presence of agenesis.

The key idea is how missing a permanent upper lateral incisor alters eruption in that segment. When a lateral incisor is absent, there’s no tooth to replace it, so the eruption pattern is disrupted and the deciduous teeth in that area tend to stay in place longer than normal. This prolonged persistence of the deciduous dentition on the affected side is a characteristic sign of unilateral upper lateral incisor agenesis, and it shapes how the space and alignment are planned for treatment.

Early extraction of the deciduous teeth isn’t typically required and can even complicate timing for subsequent orthodontic guidance. The notion of teeth mesially drifting at any age isn’t a defining feature, since movement depends on available space and treatment context rather than a universal rule. Extraction of the opposite lateral incisor isn’t obligatory either; that decision depends on overall symmetry and treatment goals, not on the mere presence of agenesis.