Final answer:
The probability of crowding of permanent teeth is influenced by the sequence of emergence and the available spaces between primary teeth.
Step-by-step explanation:
The probability of crowding of permanent teeth based on available spaces between primary teeth is influenced by the sequence of emergence and the size of the primary teeth. During middle childhood, the deciduous teeth fall out and the permanent teeth emerge. The first deciduous teeth to fall out are the incisors, followed by the premolars and canines. The second permanent molars emerge, and the wisdom teeth emerge later.
The availability of space between the primary teeth is crucial for the proper alignment of permanent teeth. If the primary teeth are closely spaced and do not provide enough room, it can increase the probability of crowding of the permanent teeth. On the other hand, if there is sufficient space between the primary teeth, it allows the permanent teeth to emerge in their proper positions without crowding.