PROSTHODONTICS - American College of Prosthodontists

September 2002, Volume II, Number 3187Figure 2. (Cont'd) (1) Full moulh radiographic series.D. Severely compromised occlusal characteristics• Entire occlusion must be reestablished, includingchanges in the occlusal vertical dimension.• Class II division 2 and Class TIl molar and jawrelationships are seen.Criteria 4: Residual Ridge CharacteristicsThe criteria published for the Classification Systemfor Complete Edentulism are used to categorizeany edentulous span present in the partially edentulouspatient (see Table I).Classification System for Partial Edentulism The 4 criteria and their subclassifications are organizedinto an overall classification system for partialedentulism.Class I (Fig lA-I)This class is characterized by ideal or minimalcompromise in the location and extent of edentulousarea (which is confined to a single arch), abutmentconditions, occlusal characteristics, and residualridge conditions. All 4 of the diagnostic criteriaare favorable.1. The location and extent of the edentulous areaare ideal or minimally compromised:• The edentulous area is confined to a single arch.• The edentulous area does not compromise thephysiologic support of the abutments.• The edentulous area may include any anteriormaxillary span that does not exceed 2 incisors,any anterior mandibular span that does not exceed4 missing incisors, or any posterior spanthat does not exceed 2 premolars or I premolarand I molar.2. The abu tment condition is ideal or minimallycompromised, with no need for preprosthetictherapy.3. The occlusion is ideal or minimally compromised,with no need for preprosthetic therapy;maxillomandibular relationship: Class I molarand jaw relationships.4. Residual ridge morphology conforms to theClass I complete edentulism description.Class II (Fig 2)This class is characterized by moderately compromisedlocation and extent of edentulous areas inboth arches, abutment conditions requiring localizedadj unctive therapy, occlusal characteristics requiringlocalized adjunctive therapy, and residualridge conditions.1. The location and extent of the edentulous areaare moderately compromised:• Edentulous areas may exist in I or both arches.2010 CDEL Re-recognition of the Specialty Report 166 of 279