Dean began the day at level par after an opening 72 at Carnoustie and finished the same way following a 70 at Panmure. Three birdies were interspersed with three bogeys for an impressive 142 tally.
He started and closed his outward nine with birdies, just one shot slipping away at the 7th, and after dropping shots at 10 and 13 picked one up at the 17th.
He faces France’s Antoine Rozner in the first round of the match play. The Frenchman qualified with a one-under-par total of 141 (73 68).
Meltham’s Jamie Bower was unable to push on after birdies at his opening two holes, carded a level-par 70 at Panmure for a 144 aggregate – and missed out by a shot.
His failure to progress to the match play stages despite being only four over par emphasised the quality of the field.
English Amateur champion Nick Marsh missed the qualifying mark by two shots, his hopes foundering on the rocks of four consecutive dropped shots from the 7th at Panmure.
He birdied 16, but rounds of 72 and 73 could not stop him missing the match play stages of the event for the second year in succession.
Marsh’s Walker Cup squad-mate Daniel Brown (Bedale) missed by a wider margin after tacking on a 77 to his 73.
Hull’s Steve Robins had three birdies in his outward nine as he added a 72 to his opening 78 and would have been chasing a sub-par round but for double bogeys at both the 4th and 18th.
William Whiteoak, of Shipley, birdied his first three holes on Monday and eagled the second at Panmure.
But his card was disfigured by a quadruple bogey eight at the 4th as he shot 79 for a 156 total, the 7th – which he birdied – being the only other shot gained to par yesterday.
Bondhay’s Daniel Wasteney (80 76) also had the misfortune to have to mark down an eight, his coming at Panmure’s par-3 13th, but after dropping a further shot at the next showed commendable spirit to birdie two of his last four holes.
Julian Taylor (York) added a 76 at Carnoustie to his first-round 74 while Moortown’s David Houlding’s character shone through as he improved his first-round score by no fewer than 12 shots.
He followed his 84 at Carnoustie with a 72 at Panmure. Three birdies on the back nine saw him level par coming home.
Jonathan Thomson (Lindrick) finished on 153 (76 77).
Scotland’s Craig Howie was top qualifier at seven under.