Trust is a good thing. I am not that sure about Thailand especially after what happened with my wife after the birth of our daughter but cost is a huge factor.
I need 3 implants. The quote from my dentist her is ~$5000 for each one using Titanium implants. I am not getting them done at that price. I have seen prices in Thailand from ~THB40000 (~$1500) each but guessing that is porcelain. May be able to get a discount for doing 3 but again not sure I want to do all 3 at once in case I am not happy with the work.
There are two different products here. The implant does into the jaw - the post on which the crown is later attached. Those should be titanium, and they do the same in Thailand. You get the posts inserted and then wait about three months before they can attach the crown. The crowns come in several different types... gold (which is arguably the best, but suited to back teeth only), and porcelain infused on metal. The latter is most common, hard wearing and matches your current teeth in terms of colour.
What your dentist may have quoted $5000 for sounds like the titanium implant
and the crown. The implant around $3000, the crown about $2K. In thailand I think the implants are about $1500, which may or may not include the crown (which are about USD250 each).
If you are based in Australia, the main problem is that the implants cost around $3000 - or $2000 after rebate from private health. This really isn't that much cheaper than Thailand (if you go for the top of the line titanium). So the cost of the airfare to thailand, plus accommodation etc etc it works out about the same (especially if you get some money back from private). Plus... if there are any problems, your dentist is local.
Thailand is great for crowns, dirt cheap compared to Australia, and the quality is identical
IF you choose top of the line. Thailand can do it much cheaper with inferior quality if that's what you want. By way of comparison, a family member needed a four tooth bridge over two implants. Australia was going to charge AUD16000. Thailand could have done it 'on the cheap' for $800, or matching the exact same quality as Australia (same german manufacturer) for $3000. So the savings were worth the trip plus 7 days accommodation in thailand.
Thailand is all about choosing your dentist. The major dental hospitals all have top trained dentists and use the same equipment - if not better - than Australia. Some smaller dental clinics match the hospitals, but this is really where you need to know your dentist... not just pick a clinic that happens to be around the corner.
For you, going to thailand frequently, you could probably get it all done there.