This is a post i previously made for relatively same issue
a post-bacc doesn't have to formally be labeled "post-bacc". rather, post-bacc is a definition of additional courses you take after you have a degree, thus, if your goal is to take additional science classes you can do them virtually anywhere (as long as it's accredited and dental schools accept the units-- you must call individual schools and ask if they accept units from specific schools). a good source of
formal post-bacc's, which includes cali schools is univ of syracuse's website:
http://hpap.syr.edu/pblist.htm
The only 1 year master's program i've personally found was at William & Mary College @ Virginia- this program is for a MA in Bio (non-thesis). however, I have personally visited UCLA's master's program in physiology and can attest that it is certainly worth applying to. the director's name is Dr. Carr or Mr. Carr and he is a very friendly gentleman. He totally put the program in perspective for me, and if you live in the area I think he is a great source for a very good (although, rumor has it you get overworked) master's program (MS Physio).
if you search for MA degrees in bio, i think you'll have a better chance of finding 1-year master's programs (for bio). also look into MPH b/c that is a highly revered master's degree within the dental and medical school communities. a good starting point are counselors and gradschools.com, best regards.
ps-
good GRE scores, good communications (eg read up on some of the instructor's research and ask if you can work w/ him/her for a master's), and lab experience will play a big role in determining acceptance to a master's program- you can do it!
most of all, don't count out the possibility of rockin the DAT- that is a very major factor (50-60%) of admissions!