NEW YORK, Jan. 24, 2014 /PRNewswire/ -- Sirona Dental Systems Inc. (NASD: SIRO) will replace Health Management Associates Inc. (NYSE: HMA) in the S&P MidCap 400 after the close of trading on Tuesday, January 28. S&P MidCap 400 constituent Community Health Systems Inc. (NYSE:CYH) is acquiring Health Management Associates in a deal expected to completed on Monday, January 27.

Sirona Dental Systems develops, manufactures, and markets dental equipment. Headquartered in Long Island City, NY, the company will be added to the S&P MidCap 400 GICS (Global Industry Classification Standard) Health Care Equipment Sub-Industry index.

Following is a summary of the change:

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