Here's a set of pediatric dental models with flat bases. We use these for teaching tooth morphology to our undergraduates. There's only half an arch of uppers and lowers, but you can simply mirror them if you want to full set. We only use half of each as they're symmetrical and is saves print time and plastic. To aid slicing there's a grouped file of all the teeth thats had the number of triangles reduced.
We print them at 600% scale to make things easy to handle and make the morphology pop in the delightful recycled Filamentive white PLA.
We printed these at 600% to make it easier to spot the details and with plenty of top layers (5) to make sure there are no holes in the upper surface.We also had some problems with some of the teeth coming off the bed so we used a brim to secure it onto the glass bed when we were printing 10 sets at once.