Claims of double-counting and unfairness have been dismissed as the driver responsible for one of Australia's deadliest bus crashes lost a sentence appeal.

Brett Andrew Button, 60, was handed a decades-long sentence for causing a crash in regional NSW that killed 10 mostly young wedding guests and injured another 25 in June 2023.

He was driving too fast and had taken significantly more than the prescribed dosage of the opioid painkiller Tramadol before his bus tipped while navigating a roundabout.

Button's sentencing judge said in his half-century of involvement in the judicial system, he was unaware of any other case that had such a devastating impact on so many people.

The fatal crash in the NSW Hunter Valley forever changed the lives of families in three states, with victims hailing

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