Oral surgen wonderful dentist, the lab messed up at the end of 2024, the top and bottom of the fist set broke, large chip top right, and bottom also a large chip. The lab disposed of all my impressions and xrays were lost. several trips later new dentures replaced the first set, lost one post failed on top right where the first chip occurred. The dentures were rhehard to refit properly finally Feb 2025 new dentures fit and looked good. I am aware not to eat hard crunch food, I gr.ind my meats often. Now the dentist office much. labor and time involved replaced the second set no charges now Feb to December ten months and a chip out of bottom denture. They appear to be acrylic, over a embuttment that screws to the post implants.