SUCESS OF CROWN AND BRIDGES DEPEND UPON SEVRAL FACTORS STARTING FROM PATIENT SELECTION TO TOOTH PREPRATION. AMONG ALL OF THESE A VERY IMPORTANT FACTOR IS INTERNAL RELIEF. DIFFERENT TYPES OF INTERNAL RELIEF HAVE BEEN SUGGESTED TO IMPROVE THE COMPLETE SEATING OF CROWNS. ALL THE CROWNS IF PROVIDED WITH INTERNAL RELIEF HAVE A GOOD SEATING AND MORE ACCURACY. INTERNAL RELIEF MATHODS CAN BE SIMPLE REQUIRING VERY LIITLE TIME OR CAN BE A BIT TIME CONSUMING. Это и многое другое вы найдете в книге INTERNAL RELIEF AND ITS SIGNIFICENCE ON THE COMPLETE SEATING OF CROWNS (Puneet Anand)