Bargnani, the first overall pick in the 2006 NBA draft, was driving the right baseline with 9:57 left in the period when he went airborne near the basket. He collided with Miami forward Alexander Johnson, who was called for a flagrant foul on the play.
The back of Bargnani's head slammed on the court. He remained down for about three minutes, before walking to the Raptors' bench assisted by medical personnel from both teams.
Even after the hit, Bargnani returned to the court to make the two free throws, doing so even while Heat team neurologist Dr. Allan Herskowitz was being summoned to the Raptors' locker room, where Bargnani met him after the second foul shot.
He showed no sign of concussion, but the Raptors said he'd likely be examined again Thursday.
"I thought he was going up for a dunk, so I jumped and caught him off-balance," Johnson said after the Raptors' 108-93 win. "I wasn't trying to hurt him."
Heat team dentist Dr. Larry Brown was also brought in to examine Bargnani, who entered the game averaging 10.3 points.
"Any time a guy leaves his feet like that, and takes that kind of a hit and goes down hard, you have to be concerned," Raptors coach Sam Mitchell said. "But it seems like he's OK. He's a little sore but we don't expect that he'll miss any time at all."
Bargnani said he broke three teeth, but X-rays ruled out any facial fractures.
"I feel a lot better now," Bargnani said.