Conditional for adding code to full page of a thread

[sparklywater]

I want to add some code to a thread which only applies when the thread page being viewed has the maximum number of posts allowed in a single page of a thread. So for example, if the maxiumum number of posts in a single page of thread is 10, I want to place some code between the 5th and 6th posts on that page. However if there are only 7 posts in the thread for example, then the code shouldn't apply. Is there a template conditional for this?