The best online guide I ever saw was the Johns Hopkins one, part of it is question and answer, the Doc is very helpful, give it a read and the best of luck for the future,
http://qa.hopkins-aids.org/forum/recentquestions.html?section_id=61
I recently went to bankok dental hospital on suk soi 49 but was not impressed. First they recommended a whole heap of work my Dentist at home said was not needed. As I had paid for exam/film etc I thought I'd let them do 'one tooth filling' somehow this turned into four at pay time and cost 7000 baht. Next time wherever I go I will get firm price first.