The central decontamination unit at Foresterhill – which sterilises and prepares the tools – was closed on 3 October.
NHS Grampian’s chief executive Laura Skaife-Knight said about 600 procedures had been postponed as a result of the decontamination closure, along with 290 elective surgeries and 311 dental procedures.
“I want to apologise to the several hundreds of patients who had their dental and elective surgical procedures cancelled, recognising the impact this has had on them,” she said.
“I know from the many correspondence, and emails and letters I have already received, the impact that that has had on those patients for which I sincerely apologise.”
She added: “We are grateful to other health boards for offering support and I can confirm that Glasgow are supporting us in this next period as some of our staff have been redeployed and are being based there in the next few weeks so that we can get on top of this.”
Last year, operations at Aberdeen hospitals were cancelled due to a lightning strike.
The decontamination problems come during a period of financial difficulties for NHS Grampian.
The health board was escalated to Stage Four of the five-stage NHS Scotland National Performance framework earlier this year, amid concerns over its financial stability, leadership and governance.
And a 138-page report into the health board found staffing levels should be reviewed amid efforts to tackle its ongoing financial difficulties.