Like many, I suspect, I have come across a lot of inferior equipment of all types over the years. Stuff that has not really been "fit for purpose" (as they say).

Notice that I did not use the words "low quality" there, however. This is (was) because the real definition of "quality" is something like:- "meeting the expectations of the user" (or purchaser).
So, in cases where expectations are a bit on the
low side ... well, no doubt you see what I'm saying.

I have also been involved in the past with commissioning dental facilities (including hospital dental labs) ... as well as many other hospital departments (and clinics). And yes, there is a lot of crap out there. But personally, I don't mind crap, just as long as I wasn't expecting (or paying for) gold! Not just in the dental world, but also in such areas as surgical instruments as well! I could go on ...
The "thing" about "dental" is that, like "veterinary" there are a lot of self-employed private practitioners out there; guys who have to watch the pennies, and actually
own and look after their kit* (much of which, in the case of vets especially, is second-hand "ex-medical" anyway).
And so there
is a market for cost-effective repairs. Many (most) dentists and vets will baulk at paying for anything else!

Having said all that, some of the "generic" brands (or even non-branded kit) - parts especially -
is fit for purpose. It's just a matter of deciding what is appropriate for your (and your customers') needs (and pockets) ... and then sorting the wheat from the chaff - which, I'll admit, is not always easy and sometimes involves not only a bit of trial and error, but occasionally ending up out of pocket as well.

*
Unlike in government hospitals, you might say.