Resources for ADI MembersCPDDentistry CPD - From FMCJournalsGatewayDiseasesTechnical ComplicationsOsteocom - Dental Learning PlatformSupporting Your PatientsADI Patient Information LeafletsProfessional Indemnity InsuranceKirokuDigital Audio Note TakingNetworkingADI Register of MentorsGuidance for Mentors & MenteesThe Mentoring ProcessJoin the Register of Mentors (Members only)Find a MentorRole of the ADIWhat Is Dental Implantology?Implant DesignExternal and Internal ConnectionsIndications For ImplantsHealing After ExtractionCareer PathwaysBefore SurgeryRisk FactorsRisk Assessment and ConsentImplant PlanningConsiderationsChoosing the Correct ImplantSpace RequirementsTiming of Implant PlacementTiming of LoadingAnatomical ConsiderationsFull Arch ConsiderationsClassificationImplant Supported OverdenturesSurgical StageFlap DesignImplant Bed Preparation and PlacementGrafting ProceduresTypes of Bone AugmentationSoft Tissue AugmentationProsthetic TreatmentPreloadAbutment SelectionReplacement of Anterior/Posterior TeethIdeal OcclusionConsiderations in Bruxist PatientsAfter CareImplant considerationsSurvival and SuccessPeri-Implant HealthPeri-Implant Disease DefinitionsRisk FactorsPatient AssessmentPrevention of DiseaseManagement of DiseaseGlossary of Terms Home Resources Before Surgery Full Arch Considerations Classification Classification Of Edentulous Jaws Cawood and Howell (1988) proposed a classification system for edentulous jaws based on a study of 300 dried skulls: Class I: Dentate ridge Class II: Ridge immediately after extraction Class III: Broad and rounded ridge with adequate height and width Class IV: Knife-edge ridge with sufficient height but inadequate width Class V: Flat ridge with insufficient height and width Class VI: Depressed ridge with a cup-shaped surface Lekholm and Zarb (1985) classified the quality of residual alveolar bone into four types: Type I: Full-thickness cortical bone Type II: Thick cortical bone layer surrounding dense trabecular bone Type III: Thin cortical bone layer surrounding dense trabecular bone Type IV: Thin cortical bone layer surrounding sparse trabecular bone