Classification of and therapy for areas of deficient bony housing prior to dental implant placement

This paper classifies treatment procedures for areas where implants cannot be placed because of lack of sufficient bone, or where additional bone is needed to enhance the results and prognosis of implant placement and restoration. Treatment classification is based on timing to tooth extraction in relation to implant placement and guided tissue regeneration. Treatment types and their techniques, their advantages and disadvantages, and indications for their use are discussed.