Final answer:
Traumatic intrusion occurs when teeth are forcibly pushed into the alveolus, making only part of the crown visible, which is distinct from luxation, another form of tooth displacement.
Step-by-step explanation:
When the teeth are forcibly driven into the alveolus so that only a portion of the crown is visible, the condition is referred to as traumatic intrusion. Traumatic intrusion is a type of dental injury where an external force pushes the tooth into its bony socket, potentially damaging the surrounding periodontal ligament and other supporting structures. This should be differentiated from luxation, which refers to the displacement of a tooth from its normal position in various directions other than into the alveolar bone.