I was told by many admissions commitee members that they use the RC to measure/predict your success in dschool? And it's quite important. I'm very serious.
If you just think logically, common sense here, you will see why:
1. You will have to read at least 100pages in dental school. If you are reading with a snail speed, you will be so behind.
2. There are lots and lots of reading, colloquial skill needed in school, and then work later on. If you do not excel reading at least above the normal average, they might say that you will not be competitive enough.
3. You will have to see how they hestitate to take students with one off scale score in. As everyone using the board scores to measure the school success in teaching/training. Why should they want to take a risk with you? And risk their school ranking?
If you put yourself in their position, you will see. To take in one person with a score way below average is not an easy job. Actually the adcom who wants to take you have to like you enough to defense for you real hard in the committee meeting. And I was told that they would never want to do such (unless it's their own child). Why make your life difficult and oppose your colleagues?
Over the years, I have seen many of my friends have a 16 in RC and PAT got rejected at not very competitive schools. So, I am not trying to scare you, but just want to let you know, there are many bad things can happen with having a 16 in your score report. And if you don't have a stellar GPA, I can guarantee you to get a few rejection letters.