ABP Implant Dentistry 2 — Questions and Answers
Question 1: Which implant surface modification technique uses high-energy particle bombardment to create micro-roughness and improve osseointegration?
- Acid etching
- Sandblasting with large-grit aluminum oxide (Correct answer)
- Anodization
- Hydroxyapatite coating
Correct answer: Sandblasting with large-grit aluminum oxide
Large-grit sandblasting (SLA surface) creates macro- and micro-roughness that enhances protein adsorption and osteoblast adhesion.
Question 2: A patient presents with peri-implantitis showing 6 mm probing depths and radiographic bone loss of 3 mm. According to current AAP/EFP classification, this represents which stage?
- Initial peri-implantitis
- Moderate peri-implantitis (Correct answer)
- Severe peri-implantitis
- Advanced peri-implantitis
Correct answer: Moderate peri-implantitis
Moderate peri-implantitis is defined by bone loss of 25-50% of implant length or 3–4 mm from the expected bone level, corresponding to this clinical presentation.
Question 3: The critical threshold for keratinized tissue width around dental implants that is associated with reduced peri-implant inflammation is:
- ≥1 mm
- ≥2 mm (Correct answer)
- ≥3 mm
- ≥4 mm
Correct answer: ≥2 mm
A keratinized tissue width of ≥2 mm around implants is associated with better plaque control, less mucosal inflammation, and reduced bone loss.
Question 4: Which of the following best describes platform switching in implant dentistry?
- Using a smaller diameter abutment than the implant platform diameter (Correct answer)
- Placing the implant platform at the bone crest level
- Switching from a machined to a rough-surface implant neck
- Using a wider abutment than the implant platform
Correct answer: Using a smaller diameter abutment than the implant platform diameter
Platform switching uses an abutment with a smaller diameter than the implant platform, moving the microgap inward and reducing crestal bone resorption.
Question 5: Immediate loading of dental implants requires a minimum insertion torque of:
- 15 Ncm
- 25 Ncm
- 35 Ncm (Correct answer)
- 45 Ncm
Correct answer: 35 Ncm
Immediate loading protocols generally require a minimum insertion torque of 35 Ncm to ensure adequate primary stability for early osseointegration.
Question 6: Which bone graft material provides both osteoconductive scaffolding and osteoinductive growth factors without requiring a donor site?
- Autograft
- Allograft (DFDBA) (Correct answer)
- Xenograft (Bio-Oss)
- Alloplast (β-TCP)
Correct answer: Allograft (DFDBA)
Demineralized freeze-dried bone allograft (DFDBA) retains BMPs and other growth factors, conferring osteoinductive properties alongside its osteoconductive scaffold.
Question 7: The Implant Stability Quotient (ISQ) measured by resonance frequency analysis reflects:
- Implant surface roughness at the bone interface
- The stiffness of the implant-bone interface (Correct answer)
- Bone density at the implant apex
- Peri-implant soft tissue thickness
Correct answer: The stiffness of the implant-bone interface
ISQ values (1–100) measured by resonance frequency analysis quantify the stiffness of the bone-implant interface, correlating with primary and secondary stability.
ABP Implant Dentistry 2
Which implant surface modification technique uses high-energy particle bombardment to create micro-roughness and improve osseointegration?