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PROPERTY AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2016
PROPERTY AND EQUIPMENT [Abstract]  
Property and Equipment
Property and equipment consist of the following:

  
December 31,
 
  
2015
  
2016
 
       
Dental equipment
 
$
10,469,568
  
$
10,635,883
 
Furniture and fixtures
  
1,700,995
   
1,730,191
 
Leasehold improvements
  
14,242,399
   
14,331,451
 
Computer equipment, software and related items
  
7,938,697
   
8,251,200
 
Instruments
  
1,731,505
   
1,960,071
 
   
36,083,164
   
36,908,796
 
         
Less - accumulated depreciation
  
(26,275,150
)
  
(29,629,360
)
         
Property and equipment, net
 
$
9,808,014
  
$
7,279,436