What is the tendency for the teeth that bound a space gap in primary and mixed dentition?

What is the tendency for the teeth that bound a space gap in primary and mixed dentition?

• A. Bodily move to the space gap
• B. Incline the crowns to the space gap
• C. Do not change their position
• D. Rotation around their axis

Answer: (A)

When a space exists between two teeth in primary or early mixed dentition, the teeth that bound that gap tend to move as a unit toward the space. This bodily movement, where the entire tooth—crown and root—shifts forward into the gap, is driven by the natural mesial drift forces during eruption and the way the periodontal ligament allows translation under changing occlusal contacts. The result is closure of the space by translating the teeth rather than merely tipping the crowns toward the gap or rotating around their axis. This pattern explains why premature loss of primary teeth often leads to space loss: the adjacent teeth drift into the space to maintain occlusion and arch harmony.

When a space exists between two teeth in primary or early mixed dentition, the teeth that bound that gap tend to move as a unit toward the space. This bodily movement, where the entire tooth—crown and root—shifts forward into the gap, is driven by the natural mesial drift forces during eruption and the way the periodontal ligament allows translation under changing occlusal contacts. The result is closure of the space by translating the teeth rather than merely tipping the crowns toward the gap or rotating around their axis. This pattern explains why premature loss of primary teeth often leads to space loss: the adjacent teeth drift into the space to maintain occlusion and arch harmony.