I can't tell for sure because I don't have access to a fee schedule, but the current UHC dental flyer suggests to me that UHC's network Maximum Allowable Charges are likely to be less than those for the Delta Dental network.
Well what your UHC flyer says now doesn't mean much to what you quoted, OVER 5 years ago.
Plus, my Dentist doesn't take delta. And it's not even available in my area.
I don't offer UHC dental plans anymore. It's CUL, bright idea or ask someone else.