Prosthetics & Dentures Flashcards

What are the two main types of implant-retained complete overdentures based on their attachment systems?

Answer: Ball/locator attachments (stud type) and bar-and-clip attachments

Implant overdentures are primarily retained by either ball/locator stud attachments (individual implant retention) or bar-and-clip systems (connecting implants for greater stability).

What is the purpose of a registration rim (occlusal rim) at the jaw registration stage of complete denture construction?

Answer: Record jaw relationships (OVD, occlusal plane, centre line) and tooth positions for the lab

Registration rims allow the clinician to record the correct OVD, establish the occlusal plane and lip support, mark the centre line and canine positions, and transfer these to the articulator for tooth arrangement.

What is a common cause of persistent gagging with a complete upper denture?

Answer: Over-extension of the posterior palatal border

Over-extension of the posterior border into the soft palate stimulates the gag reflex; trimming the posterior border to the vibrating line (Ah line) resolves this in many cases.

When should a definitive reline of a complete denture be performed?

Answer: After ridge remodelling is stable (6–12 months after tooth loss)

Definitive relining should be deferred until alveolar ridge remodelling has stabilised, typically 6–12 months after extractions, to ensure the reline captures a stable tissue record.

Which articulator type is required for the most accurate transfer of patient jaw relationships in complex prosthodontics?

Answer: Fully adjustable (Denar, Whip Mix) with face-bow record

Fully adjustable articulators with a face-bow transfer accurately replicate the patient's condylar angles and hinge axis, essential for complex restorative and complete denture cases.

What is the difference between a balanced articulation and a group function occlusal scheme?

Answer: Balanced articulation maintains contacts bilaterally in all excursions; group function is unilateral working-side contacts only

Balanced articulation maintains bilateral tooth contacts throughout all excursive movements, used for complete dentures; group function relies on multiple unilateral working-side contacts, used for natural dentition or RPDs.