A former dentist in Massachusetts has pleaded guilty to Medicaid fraud for using paper clips instead of stainless steel posts in root canals. Michael Clair is scheduled to be sentenced next Monday after pleading guilty last week in New Bedford Superior Court to a variety of charges, including defrauding Medicaid of $130,000 assault and battery, illegally prescribing prescription drugs and witness intimidation. Prosecutors say the 53-year-old Clair was suspended by Medicaid in 2002, but continued to file claims from August 2003 to June 2005 by using the names of other dentists in his Fall River practice.