I belong to Cigna dental insurance. Could anyone explain why some peoples dental insurances cover all the costs for dental check ups, x rays, fillings, crowns etc. and other dental insurances only cover a portion of the bill and the patient has to pay the rest? I went to a dentist recently and I had to pay $188.00 for x rays and a teeth cleaning (first time visit). My insurance paid $97.00 of the total bill which was $285.00 which includes a $25.00 annual deductible. Why couldnt my insurance pay for the entire bill of $285.00, whereas some people dont have to pay a nickel for it?