I've noticed that many of the schools that I applied to have a minimum cut off score for the RC. You should ask the schools you applied to and see what they reccomend/require. One of the schools I talked to wants their applicants to have atleast an 18 on the RC because they said that their current dental students that did well on the RC, are doing well in dental school so I guess the RC somehow correlates with how well you'll do in dental school.. I think its BS but thats what they say...
Good luck.