Heartland Dental Care LLC is buying My Dentist Holdings LLC for an undisclosed amount.

Oklahoma City-based My Dentist has 55 dental affiliates in Oklahoma, Missouri, Texas, Kansas and Arkansas. The offices provide dental services, orthodontics and oral surgery.

Heartland Dental, headquartered in Effingham, Ill., has more than 440 affiliated dental offices in 26 states.

The deal follows a surge of M&A activity in the physician group space, where Mednax Inc. (NYSE: MD) has recently picked up Dayton Newborn Care Specialists Inc., and ATI Physician Therapy bought North River Physical Therapy

Other dental-related deals have included Linden Capital Partners October 2012 recapitalization of Northwestern Management Services LLC, which provides administration services to Gentle Dental Group. Also, in July, Main Street Capital Corp. (NYSE: MAIN) partnered with private equity firm Riker Capital to recapitalize Garreco LLC, which makes dental products.

Ropes & Gray LLP provided legal counsel to Heartland on the deal.

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