The Wizards made six 3s in the fourth quarter, but never went to the free-throw line while Kaman's closing three-point play made Dallas 9 of 10 from the stripe in the final 12 minutes.
"For whatever reason, this team doesn't get any respect," Wittman said. "We go to the rim, and had 11 free throws. These young guys just have to make a name for themselves. And it's just baffling some of the things that are said to me by the refs for why they don't call it."
Jordan Crawford led Washington with 21 points.
It was the first game in Dallas started together by Kaman and Elton Brand, Mavs newcomers who were past teammates with the Los Angeles Clippers. The Mavs are missing injured starters Dirk Nowitzki and Shawn Marion.
Brand had 11 points and 12 rebounds. Jae Crowder, the rookie who had started the previous four games, scored 12 points off the bench.
The Wizards were within 37-33 when Emeka Okafor made a 7-foot turnaround jumper with just under 7 minutes left in the first half.
Brand then made a pair of free throws to start a 15-2 run. And the Mavericks made 10 of their next 12 shots for a 63-45 halftime lead.
It was the first 40-point quarter this season for the Mavericks.
NOTES: Wizards starting guard AJ Price sprained his right ankle. He finished with 11 points. ... Marion missed his fifth consecutive game because of a sprained left knee. Carlisle said Marion is getting closer to returning, but still isn't sure if he will make the trip for back-to-back games this weekend at Indiana and Cleveland. ... Nowitzki is still recovering from arthroscopic knee surgery before the season. ... Dallas has won five in a row against Washington since October 2009. ... There was an announced crowd of 19,560, which was the team's 437th consecutive sellout — despite obvious blocks of empty seats throughout the arena.