There are many developmental abnormalities that can affect the teeth and facial skeleton. In most cases, clinicians need little more than to be able to recognize these abnormalities – this recognition being based on both the clinical and radiographic findings. Therefore, the bulk of this chapter is designed like an atlas to show examples of some of the more common and important abnormalities that have characteristic radiographic features. A broad classification of the main conditions is also included.
• Infraocclusion, second deciduous molars apparently descend into the jaws. These teeth in fact remain in their original position while the adjacent alveolar bone grows normally. As these teeth appear to submerge the original term for this positional anomaly was submersion.