@SterlingWright Wow. Dad never told us about that (that I recall). He used to educate us a lot about dentistry when he was still practicing, so we kids could work there during the summer & any family could help with an emergency--sort of. (I hated doing chairside because I never seemed to anticipate his needs fast enough on anything other than an extraction. I usually worked "roving assistant," but I rarely mixed the crown prep cement fast enough or to the right consistency. *sigh*)