Once again, it’s Tuukka time. It’s been three years since Tuukka Rask stood in the crease for an NHL playoff game as the Bruins goalie, so the time couldn’t come soon enough. After watching former teammate Tim Thomas during the last two postseasons, Rask is looking forward to the Eastern Conference quarterfinals matchup with the Toronto Maple Leafs. “Obviously I want to help the team to win a series. That’s my biggest concern,” Rask said. “I’m not trying to really prove people wrong or anything like that. I just try to play as good as I can and help the team to win a series and see where that leads us.” Following last night’s 4-2 loss to the Ottawa Senators in the regular-season finale, Rask looked to turn the page quickly. The goalie wasn’t terrible, but he was far from perfect in letting in three goals, including the game-winner from Jean-Gabriel Pageau with 3:34 left in the third period. Rask said it was a disappointing loss, but he’s excited for the playoffs. As the No. 4 seed, the B’s will open the playoffs on Wednesday night at the Garden against the Maple Leafs. It’s been a long two years for the 26-year-old goalie. He never complained about losing the starting job to Thomas but always believed he was ready for the job. Rask had a solid year finishing this lockout-shortened season third in the NHL with a .929 save percentage and in a tie for fifth with a 2.00 goals-against average.