A former Massachusetts dentist was sentenced to one year in jail Monday for using paper clips instead of stainless steel posts in root canals.

Dr. Michael Clair pleaded guilty earlier this month to a list of charges, including assault and battery, defrauding Medicaid of $130,000, illegally prescribing medications and witness intimidation.

Prosecutors said Clair sometimes used sections of paper clips when performing root canals in an effort to save money. Some of his patients reported infections and other problems.

Brenda Almeida said her teenage son's tooth turned black and had to be removed after Clair performed a root canal on him in 2005. She said Clair also performed shoddy dental work on her other two children.

Almeida, who watched Clair get sentenced in Fall River Superior Court Monday, said she was angry about what she considers to be a light sentence.

"He put my kids in pain for months ... I hope he rots there," she said after Judge Richard Moses sentenced Clair to a year in the Bristol County House of Correction.

Prosecutors, who asked for a sentence of five to seven years, declined to comment immediately after the sentence was imposed.