A prominent Melbourne dentist has taken defamation action against a patient who posted a scathing online review after claiming he was quoted $1200 for a filling that would take only 45 minutes.

Carlton resident Mark Robert Bradbury gave Smile Solutions a one-star rating on the practice's Google listing page before launching a personal attack on the business' owner and director, Kia Pajouhesh.

Dr Kia Pajouhesh in his office at the Manchester Unity building. Credit:Arsineh Houspian

"The greedy owner drives a Bentley and brags about his private box at the footy ... yet his motto is 'we see things from the patient's perspective'. Hmm ... the only thing this lot see is the size of your wallet," wrote Mr Bradbury, according to a Supreme Court writ.

Based in the Manchester Unity building in Collins Street, Smile Solutions was founded by Dr Pajouhesh 24 years ago and has become one of the nations's largest private dental practices, with almost 50 dentists, specialists and hygienists.