Private equity group Genesis Capital has made a late attempt to foil a $305 million buyout of dentistry group Pacific Smiles by rival private equity company Crescent Capital.

Genesis, which has a 19.9 per cent stake in Pacific Smiles, made an approach to the target’s board on Sunday with a revised $1.90 a share offer which includes the option of accepting some scrip in the private bidding vehicle, or all cash.