For Johnson, it was only his fourth start of the season and he played well, making timely saves, especially in the third period, when Carolina finally created some pressure after two lackluster periods. At the other end of the ice, the Hurricanes' Cam Ward kept his team in it and finished with 35 saves.
The Hurricanes gained the early advantage when they scored a power-play goal at 5:53 of the first period. Carolina had control of the puck when defenseman Andrej Sekera took a shot from the point and it made its way through traffic and beat a screened Johnson.
Boston answered and scored on its first man-advantage of the game to tie it at 1-1 at 14:49. The Bruins produced solid puck movement when Milan Lucic unleashed a shot from the high slot, but Ward made the initial save before Chara was there to knock in the rebound. It was his team-leading fourth power-play goal of the season. In fact, all of his goals this season have come on the PP.
The Bruins dominated play in the second; Carolina didn't register a shot on goal until there was 8:05 remaining in the period. However, the game remained tied until Smith netted the go-ahead goal at 13:31 of the second. Linemate Carl Soderberg did a solid job of protecting the puck in front of the Carolina net before he fed Smith, who beat Ward with a short-side backhander. It was Smith's fourth goal of the season.
Carolina tied the game at 2-2 when Patrick Dwyer scored an unassisted short-handed goal at 11:10 of the third period. He beat Johnson on a breakaway with a backhander to the stick side.
The Bruins wasted little time in OT, with Krejci scoring his fourth goal of the season.
REST FOR RASK: Bruins No. 1 goalie Tuukka Rask has played 19 games this season and has a 12-5-2 record, along with a 1.62 goals-against average and a .945 save percentage. Last week, he played three games in four nights. He's an early-season favorite for the Vezina Trophy and he's planning on playing a lot of games this season, his first with a new eight-year deal worth $56 million.
INJURY UPDATES: Bruins defenseman Adam McQuaid (lower body) continues to progress and could be ready for game action next week. He has missed seven games. Fellow defenseman Dennis Seidenberg (lower body) remains sidelined and hasn't been able to skate yet. He suffered the injury during his first shift of Tuesday's game in New York. With both still out, rookie Kevan Miller played his second consecutive NHL game with the Bruins. He continues to play well and impress.
UP NEXT: The Bruins host the Pittsburgh Penguins at 7 p.m. ET Monday at TD Garden.