If mandibular premolars are drifting mesially due to missing teeth, what effect does this have?

• A. Increased bite force
• B. All teeth align properly
• C. Space between the premolar and molar increases
• D. Decreased chance of tooth movement

Answer: (C)

When mandibular premolars drift mesially due to the absence of adjacent teeth, the effect observed is that the space between the premolar and molar increases. This occurs because, without the presence of a tooth in the area where the molar would typically be, there is less resistance opposing the mesial movement of the premolars. As the teeth move, the alignment of the dental arch is altered, leading to an increase in the space that develops between the premolars and the molars.

This change in position can disrupt normal dental occlusion and might contribute to other dental issues, such as altered bite patterns or increased wear on the remaining teeth. Understanding this dynamic is essential for assessing the consequences of missing teeth and planning appropriate treatment, such as potential space closure or tooth replacement options.