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PROPERTY AND EQUIPMENT
12 Months Ended
Dec. 31, 2012
PROPERTY AND EQUIPMENT [Abstract]  
PROPERTY AND EQUIPMENT
(4) 
PROPERTY AND EQUIPMENT
 
Property and equipment consist of the following:

   
December 31,
 
   
2011
  
2012
 
        
Dental equipment
 $8,323,040  $8,983,394 
Furniture and fixtures
  1,364,186   1,479,897 
Leasehold improvements
  8,952,389   10,147,928 
Computer equipment, software and related items
  3,653,587   4,854,173 
Instruments
  1,586,581   1,697,690 
    23,879,783   27,163,082 
          
Less - accumulated depreciation
  (18,090,262)  (19,268,749)
          
Property and equipment, net
 $5,789,521  $7,894,333 

Depreciation expense was $1,693,416, $1,729,669 and $2,097,837 for the years ended December 31, 2010, 2011 and 2012, respectively