1 On the other hand, according to Healthboards.com, the cost of overdentures is around $5,000. 2  An implant retained denture figure costs around $1,500 to $2,000 per implant. Dental implants cost around $1,600 to $2,500 for the implant placement. 2  An abutment and crown are required after healing which costs around $1,500 to $3,000. 3  On average, the cost of overdentures is around $3,800. 4  On the other hand, according to Healthboards.com, the cost of overdentures is around $5,000.