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Coming together at 61/2, Root and Malan pushed England to 220/2 at stumps on Day 3, having cut Australia's lead to 58 runs.
Head's unbeaten 112 from 96 balls pushed Australia to a commanding 196-run lead over England's paltry first innings total of 147 with three wickets in hand.
Broadcasters later reported that the equipment used by the third umpire to check the front foot had broken down and the officials had reverted to the protocols used before the technology existed.
Australia's first fast-bowling skipper in 65 years, Cummins shone on a golden day for the home side which began with Mitchell Starc removing Rory Burns on the very first ball and ended early with a storm and bad light.
Buttler was speaking after media reports that Anderson had been ruled out of the match, which starts at the Gabba on Wednesday, due to a calf strain.
Carey was preferred to uncapped wicketkeeper Josh Inglis.
The all-rounder, writing in a column for the Daily Mirror, said the tablet had gone down the wrong way and got stuck in his windpipe.
Paine, who was the only specialist wicketkeeper named in Australia's 15-man Ashes squad, is likely to be replaced by experienced white-ball wicketkeeper Alex Carey or Josh Inglis, both of whom were named in the recent Australia 'A' squad.
Being captain was the one thing that guaranteed the 36-year-old selection and he now faces a challenge to prove he deserves a spot behind the stumps.
With less than three weeks to go for the Ashes, Paine had tearfully relinquished the Test captaincy over the scandal on Friday, saying he deeply regretted the incident.
Results 81-90 of 160