Edentulous Examination
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Direct answer
Careful examination of the edentulous patient decides whether routine complete dentures will succeed or fail. It covers the general history, extraoral structures, the residual ridges and their mucosal covering, border limiting structures, saliva and jaw relations, and it ends with a written prognosis — good, guarded or poor — for the planned prosthesis. The classic frameworks used are Atwood's six orders of residual ridge form, Cawood and Howell's six classes, and House's three palatal forms.
What you must remember
- History comes first: diabetes, nutritional deficiency, neuromuscular disease such as Parkinsonism and epilepsy all modify treatment; the specific complaints about an old denture often reveal the diagnosis before the mouth is opened.
- Atwood (1963) described six orders of residual ridge form, from the pre-extraction ridge through the high well-rounded and knife-edge shapes to the low flat and finally depressed ridge; Cawood and Howell (1988) graded six classes based on ridge width and height.
- House's palatal forms: Class I flat, Class II medium U-shaped, Class III high V-shaped vault; the medium vault is the most favourable, a flat palate gives stability but a poor seal, and a deep V-shaped vault retains well but contacts little ridge area.
- House also classified patient attitudes — philosophical, exacting, indifferent and hysterical — a viva favourite that predicts cooperation better than ridge height does.
- Mandibular findings dominate prognosis: a flat ridge with the floor of the mouth level with the crest, mobile soft tissue over the crest and prominent genial tubercles spell trouble for a lower denture.
- Record high frenal attachments, shallow vestibules, palatal or mandibular tori, bony spicules and undercut tuberosities, since any of them may need surgical correction before impressions.
- Saliva is assessed for quantity and consistency; xerostomia destroys adhesion and cohesion, while excess saliva in new wearers settles within weeks.
- Note the skeletal relation and interarch space: a severe Class II or III jaw relation and a reduced interarch distance complicate tooth placement, occlusion and denture stability.
Working through a pre-treatment assessment
Picture a 62-year-old teacher who has worn one set of dentures for fifteen years and reports a loose lower prosthesis and burning on chewing. Begin with the complaints in her own words — looseness, pain, gagging, poor appearance or chewing difficulty each point to different faults. Extraorally, note facial asymmetry, lip length and profile, screen the temporomandibular joints, and assess interarch space at rest. Intraorally, palpate rather than look: firm, keratinised mucosa over the tuberosities and buccal shelves supports well, whereas a flabby anterior maxillary ridge suggests long-standing function against a worn lower denture. Trace the frenums for high attachments that will notch the flange, and examine the mandible for a sharp mylohyoid ridge and retromolar pad quality. Ask her to say "ah" and to move the tongue to each side to gauge active borders. Saliva is checked for flow and stringiness; a dry, sticky mouth flags xerostomia, often drug-related in this age group. Finish by placing her attitude — relaxed and realistic is House's philosophical patient — and then commit to a graded prognosis: good for the maxillary denture, guarded for the mandibular one, with an overdenture or implant option discussed honestly at the outset.
Beyond the ridge
Most candidates inspect the ridge and stop there, yet two findings change management more than ridge height. The first is the old denture itself: a lower denture worn beyond occlusal wear causes a combination syndrome picture that no amount of border moulding will fix. The second is House's hysterical patient — one who has "tried five dentists and every denture fails"; rushing to impress this patient with a new impression technique invites the sixth failure, whereas a guarded prognosis set in writing at the first visit protects both patient and clinician.
Frequently asked questions
Which classifications describe residual ridge resorption?
Atwood's six orders track the ridge from pre-extraction form to the depressed residual ridge, and Cawood and Howell's six classes (1988) grade width and height — both standard viva answers.
What are House's three palatal forms?
Class I is a flat palate, Class II a medium U-shaped vault and Class III a high V-shaped vault; retention and stability trade off between them, with Class II the most favourable overall.
Why is the history of the previous denture so important?
Specific past complaints locate the true fault — overextended flanges, an incorrect vertical dimension or worn teeth — and separate a correctable denture error from a ridge or patient factor that persists in any new prosthesis.
Which mandibular findings predict a poor lower denture outcome?
A flat knife-edge ridge, floor of the mouth level with the crest, mobile tissue over the ridge, high muscle attachments and reduced interarch space together downgrade the prognosis and justify discussing implants or overdentures early.
What is a flabby ridge and why detect it at examination?
A flabby ridge is mobile, displaceable fibrous tissue over the crest, common in the anterior maxilla of long-term denture wearers; it signals that special impression techniques and occlusal strategy will be needed.