As of the end of 2009, it has happened twice.
The first time was in Super Bowl XXIV by the San Francisco 49ers, they beat the Denver Broncos by the score of 55-10 in New Orleans at the Superdome. Joe Montana won the MVP.
The second time was Super Bowl XXVII by the Dallas Cowboys, they defeated the Buffalo Bills by the score of 52-17 at the Rose Bowl in Pasadena, California. Troy Aikman won the MVP.
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Team with highest Super Bowl score: The San Francisco 49ers scored 55 points in Super Bowl XXIV (1990) defeating the Denver Broncos 55-10. Teams with highest combined Super Bowl scores: As of 2011, the most points were scored in Super Bowl XXIX (1995). The 49'ers played the San Diego Chargers and won 49-26. The 75 total points is a Super Bowl record.
As of the start of the 2008 season: The teams that have been to the Super Bowl and lost each time are the Buffalo Bills, been there 4 times consecutively (0-4); Cincinnati Bengals (0-2); Tennessee Titans (0-1); San Diego Chargers (0-1); Philadelphia Eagles (0-2); Minnesota Vikings (0-4); Carolina Panthers (0-1); Atlanta Falcons (0-1); Seattle Seahawks (0-1). The Cleveland Browns; Jacksonville Jaguars; Houston Texans; Detroit Lions; New Orleans Saints, Arizona Cardinals have never played in a Super Bowl. The Arizona Cardinals were in the Super Bowl against the Pittsburgh Steelers but lost.
As of Super Bowl XLII, that was the San Francisco 49ersand San Diego Chargers in Super Bowl XXIX when the 49ers won 49-26 for a combined total points of 75.
The most points scored by a team in an NFL game was 73 by the Chicago Bears in the 1940 NFL Championship game. The Bears beat the Redskins 73-0. Additionally, the regular season record was set on November 27, 1966 when the Redskins beat the Giants 72-41 in Washington. The combined total of 113 points remains an NFL record as of this post (July 13, 2012.)
Super Bowl XVI: 49ers 26, Cincinnati Bengals 21