What is the space between the canine and the first premolar in the lower jaw of some primates called?

The space between the canine and the first premolar in the lower jaw of some primates is called diastema. Diastema is mainly caused by imbalance in the connection between the jaw and the size of teeth. Diastema can form anywhere in the mouth and it affects both adults and children.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.