This is not really a new deal as such but more people should know about this. No Gaps Dental offers no out-of-pocket expenses with any Australian Health fund for common dental treatments including check-ups, teeth cleaning, x-rays and fillings too! As far as I know, this is the only dentist in Sydney that does no gaps fillings. They have more than 10 locations in Sydney.
If you currently don't have a dental extras cover and need a filling that's not urgent, it is worth taking out one of the standard extras covers, most of which have a 2 month waiting period. For example, HCF Bronze Extras starts from $15.35 (excluding Australian Government Rebate) a month ($350 annual dental limit) or, if you want a higher annual limit, consider GMHBA Bronze Extras Set Benefits for $24.25 a month ($1000 annual dental limit).
If you need one urgently, Ahm lifestyle extras coverfor $66.05 a month ($500 annual dental limit) currently offers no waiting period on routine dental, including fillings. Alternatively, many funds offer no waiting period when you take out both extras and hospital cover.
I myself had a couple of fillings and an xray (edit: at my request) done at No Gaps Dental recently and was very satisfied with the experience. The practice was well equipped and the dentist was friendly and professional. The billing was fairly easy too, just make sure to bring your insurance card and make sure that you haven't reached your annual limits. After everything was done, my bill was about $800. They swiped my insurance card and the dental cover paid over $250 and the rest was waived under their no gaps guarantee.
Judging by the annual dental fee survey the exact same treatment would have cost in over $450 at the "cheapest dental practice", meaning that I would have to pay over $200 gap payment. And I would have to find that "cheapest dental practice" somehow. If we go by the average prices from the same survey, the total would have been over $600 and my gap payment would have been more than $350. Needless to say I am quite happy I did not have to pay that.
Hope this helps someone.
Edit: there seems to be a similar no gaps fillings included dentist in Melbourne, but I have no experience with them: http://www.dentalguard.com.au/