Which of the following is NOT a sign of cleidocranial dysplasia?

Cleidocranial dysplasia is a genetic condition characterized by anomalies primarily affecting bones and teeth. The signs and symptoms of this condition include a range of dental issues that are typically observed, such as the prolonged retention of deciduous (baby) teeth, delayed eruption of permanent teeth, and the presence of multiple unerupted supernumerary teeth.

Prolonged retention of deciduous teeth occurs because the roots of these teeth do not fully resorb, preventing the permanent teeth from pushing them out. Delayed eruption of permanent teeth happens due to disruptions in normal dental development, which can lead to a significant lag in when these teeth come in. The presence of multiple unerupted supernumerary teeth is another hallmark of this condition, as individuals may develop extra teeth that can remain impacted and not erupt appropriately.

In contrast, overcrowded jaw is not directly attributable to cleidocranial dysplasia itself; rather, it can be a consequence of various factors affecting dental arch shape and size, which might not directly relate to this condition specifically. Therefore, overcrowding can occur in many other scenarios unrelated to cleidocranial dysplasia, making it the choice that is least associated with the signs of this disorder.