Dental Implants Prosthetic Restoration 2 — Questions and Answers
Question 1: An implant overdenture retained by locator attachments provides which primary advantage over a conventional full denture?
- Eliminates all denture movement
- Significantly improved retention and stability with minimal bone resorption prevention (Correct answer)
- Does not require any maintenance
- Functions identically to fixed implant restorations
Correct answer: Significantly improved retention and stability with minimal bone resorption prevention
Locator-retained overdentures dramatically improve retention and functional stability compared to conventional dentures while preserving remaining alveolar bone.
Question 2: The McGill consensus (2002) recommended that the minimum standard of care for edentulous mandibular patients should be:
- A full arch fixed implant bridge
- Conventional complete denture alone
- A two-implant retained mandibular overdenture (Correct answer)
- A four-implant overdenture
Correct answer: A two-implant retained mandibular overdenture
The McGill and York consensus statements established that a two-implant mandibular overdenture should be the minimum standard for edentulous patients.
Question 3: In the All-on-4 concept, the two posterior implants are tilted at approximately what angle?
- 10 degrees
- 30 degrees
- 45 degrees (Correct answer)
- 60 degrees
Correct answer: 45 degrees
Posterior implants in the All-on-4 protocol are tilted at approximately 45 degrees to avoid anatomical structures (sinus/nerve) while maximizing bone contact and reducing cantilever length.
Question 4: What is the purpose of a 'pink porcelain' or 'pink acrylic' component in full-arch implant prostheses?
- It is a cosmetic choice only
- It replaces lost gingival and bone tissue for esthetic and phonetic support (Correct answer)
- It reinforces the metal framework
- It prevents bacterial plaque accumulation
Correct answer: It replaces lost gingival and bone tissue for esthetic and phonetic support
Pink prosthetic material mimics gum tissue to replace volumetric loss of soft and hard tissue that occurs after tooth loss and resorption.
Question 5: Implant-supported crowns should NOT have which type of occlusal contact?
- Centric stops on the central fossa
- Mutually protected occlusion contacts
- Heavy working-side interferences during lateral excursion (Correct answer)
- Anterior guidance involvement
Correct answer: Heavy working-side interferences during lateral excursion
Working-side interferences on implant crowns create potentially destructive lateral forces that the implant bone interface cannot absorb with a periodontal ligament shock absorber.
Question 6: A provisional (temporary) implant restoration during osseointegration should be:
- In heavy occlusal contact to stimulate bone healing
- Out of occlusion or in minimal occlusal contact to avoid disturbing integration (Correct answer)
- A permanent acrylic crown cemented definitively
- Always avoided — no restoration until final crown
Correct answer: Out of occlusion or in minimal occlusal contact to avoid disturbing integration
Provisional restorations must be relieved from occlusal contact to prevent functional forces from causing micro-movement during the critical osseointegration period.
Dental Implants Prosthetic Restoration 2
An implant overdenture retained by locator attachments provides which primary advantage over a conventional full denture?