After 20 days away from AmericanAirlines Arena, the Miami Heat did not look quite the same upon their return. LeBron James watched from the bench in a sports coat, while Greg Oden was in the starting lineup. About the only thing that remained the same was the homecourt success, with the Heat surviving a typically ugly matchup with the Chicago Bulls for a 93-79 victory Sunday. ''We were missing a pretty big man,'' Heat guard Dwyane Wade said of James sitting out with a broken nose. ''There's nothing we can do to replace the best player in the world, but we just had to go out there and play team basketball on both ends of the floor.'' Holding the Bulls scoreless for the first half of the second period and then limiting them to 12 points in the third quarter, the Heat made the lack of James' offense moot, as they improved to 21-4 at home at the start of this four-game homestand. The 79 points were the fewest scored against the Heat this season.