ShawnOne is right. Regardless of your dependent status on the FAFSA for the stafford loans, if you want to apply for the HPSL loan, you MUST include your parents information. Now, this is not as bad as it sounds. Let me explain.
If HPSL determines that because of your parents income, that your family contribution ought to be $XXXXX.XX towards your education, the HPSL will allow you to count your stafford loans as your family contribution. For example,
Joe Dentist wants to go to XYZ college where the annual budget costs (tuition, living, fees, etc.) are $60,000/yr. Joe applies for the Subsidized, Unsubsidized, and additional Unsubsidized loans and gets awarded $50,000/yr. That leaves him $10,000 short. Then he applies for the HPSL, which has a maximum award equal to annual tuition, fees, and reasonable living expenses (i.e. essentially what each school calls their "financial aid budget) which in Joe's case is $60,000. HPSL processes his application, and because of his parents income, determines that he must contribute $50,000 towards his education, but HPSL will award him the remaining $10,000. Fortunately, HPSL allows students to treat their Stafford loans (unsubsidized, subsidized, and addt'l unsubsidized) as if they were his personal contributions. Therefore, Joe doesn't need to come up with any money out of his own pocket, if he doesn't want to; and, he has the $60,000 he needs to attend XYZ college ($50,000 stafford loans + $10,000 HPSL = $60,000).
In this contrived situation, I assumed that HPSL intended to make the student pay almost 80% of his school costs. In reality, I think that is a doomsday scenario. I imagine that the amount of expected contributions from the student will not be as extreme as the amount I used in this example. However, for our own sakes, I think this example illustrates that most of us don't need to worry about "getting financed" or coming up with an amount of money that neither my parents or myself want to or have to spend on a dental education.
If you want to read the actual law governing the HPSL awards, PM me and I'll give you the link to their site.