The Bluejays improved to 11-1 and have won five in a row since a Nov. 28 defeat at the hands of Boise State.
Dingman came off the bench to turn in his big 3-point shooting performance as part of a 51-percent team effort from the field.
Doug McDermott added 16 points and Gregory Echenique had 15 for the Bluejays.
Tulsa (6-5) got 15 points and 10 rebounds from James Woodard.
Notable deaths of 2014 [PHOTOS]