PROSTHODONTICS - American College of Prosthodontists

32 Clarszjicatwn ofcomplete Edeiitulism McGar??; et a10 Maxillary palatal tori and/or lateral exostoses arerounded and do not affect the posterior extensionof the denture base.Type C (Fig 7)0 Loss of anterior labial vestibule.Palatal vault morpholog~7 offers minimal rcsistanceto vertical and horizontal movement of thedenture base.0 Maxillary palatal tori and/or lateral exostoses withbony undercuts that do not affect the posteriorextension of the denture base.Hyperplastic, mobile anterior ridgc offcrs minimumsupport and stabilit).-ofthe denture base.13,140 Reduction of the post malar space by the coronoidprocess during mandibular opening and/or excursivemovemcnts.Type D (Fig 8)0 Loss of anterior labial and posterior buccal vestibules.0 Palatal vault morpholoa does not resist vertical orhorizontal movement of the denture base.Maxillary palatal tori and/or lateral exostoses"(rounded or undercut) that intcrferc with theposterior border of the denture.Hyperplastic, redundant anterior ridge.Prominent anterior nasal spine.Muscle Attachments: Mandible onlyThe effects of muscle attachment and location aremost important to the function of a mandibulardent~re.~~'"'~ These characteristics are difficult toquantify. The classification system follows a logicalFigure 10. T\pe B mandibular muscle attarhmrnts. Lossof anterior labial vestibule.progression to describe the effects of muscular influenceon a mandibular denture. The clinician examinesthe patient and selects the category that is mostdescriptive of the mandibular muscle attachments.Type A (most favorable) (Fig 9)Attached mucosal base without undue muscularimpingement during normal function in all regions.Type B (Fig 10)Attached niucosal base in all regions exccpt labialvestibule .Mentalis muscle attachment near crest of alveolarridgc.Type C (Fig 11)Attached mucosal base in all regions except antcriorbuccal and lingual vestibules-canine to canine.Figure 9. Type A mandibular muscle attachments. Allvestibules are adequate.Figure 11. Type C mandibular muscle attachments. Lossof anterior labial and lingual vestibulcs.2010 CDEL Re-recognition of the Specialty Report 151 of 279