CIT Pharmacology & Medications in Implantology 5 — Questions and Answers
Question 1: When a patient is allergic to penicillin, which antibiotic is a common alternative for prophylaxis in implant surgery?
- Tetracycline
- Clindamycin (Correct answer)
- Metronidazole alone
- Ciprofloxacin
Correct answer: Clindamycin
Clindamycin provides coverage against gram-positive and anaerobic oral organisms and is the standard penicillin-allergy alternative in dental surgical prophylaxis.
Question 2: Epinephrine is added to local anesthetics used during implant surgery primarily to:
- Increase anesthetic potency
- Prolong anesthetic duration and reduce systemic absorption (Correct answer)
- Reduce postoperative pain
- Act as an antimicrobial agent
Correct answer: Prolong anesthetic duration and reduce systemic absorption
Epinephrine causes local vasoconstriction, slowing anesthetic absorption into the bloodstream and extending the duration of the block while reducing bleeding.
Question 3: A patient using proton pump inhibitors (PPIs) long-term is at risk for implant complications primarily because PPIs can cause:
- Increased oral bacterial load
- Reduced calcium absorption leading to lower bone density (Correct answer)
- Elevated platelet aggregation
- Delayed wound epithelialization
Correct answer: Reduced calcium absorption leading to lower bone density
Long-term PPI use reduces gastric acid-mediated calcium absorption, potentially decreasing bone mineral density and impairing osseointegration.
Question 4: Which local anesthetic has the longest duration of action and is often used for prolonged implant procedures or postoperative analgesia?
- Lidocaine
- Mepivacaine
- Prilocaine
- Bupivacaine (Correct answer)
Correct answer: Bupivacaine
Bupivacaine has a significantly longer half-life than other dental local anesthetics, providing extended numbness useful for lengthy or painful implant surgeries.
Question 5: Metronidazole is sometimes combined with amoxicillin for implant-related infections because metronidazole specifically targets:
- Aerobic gram-positive cocci
- Obligate anaerobic bacteria (Correct answer)
- Fungal organisms
- Mycobacteria
Correct answer: Obligate anaerobic bacteria
Metronidazole is selectively effective against obligate anaerobes, complementing amoxicillin's spectrum for polymicrobial peri-implant infections.
Question 6: Systemic tetracyclines are sometimes used adjunctively in peri-implantitis management because they:
- Stimulate bone regeneration directly
- Inhibit matrix metalloproteinases and have anti-inflammatory properties beyond antibacterial activity (Correct answer)
- Have no systemic side effects
- Are effective against all biofilm-forming organisms
Correct answer: Inhibit matrix metalloproteinases and have anti-inflammatory properties beyond antibacterial activity
Tetracyclines inhibit host-derived MMPs that degrade connective tissue, providing an anti-destructive effect useful in managing peri-implant bone loss.
Question 7: A patient who smokes is prescribed an implant-supported prosthesis. From a pharmacological standpoint, nicotine primarily impairs implant healing by:
- Directly dissolving titanium oxide layer
- Causing vasoconstriction and reducing tissue oxygenation (Correct answer)
- Increasing salivary antibody levels
- Blocking osteoclast activity
Correct answer: Causing vasoconstriction and reducing tissue oxygenation
Nicotine-induced vasoconstriction reduces blood flow and oxygen delivery to surgical sites, impairing healing and increasing failure risk.
CIT Pharmacology & Medications in Implantology 5
When a patient is allergic to penicillin, which antibiotic is a common alternative for prophylaxis in implant surgery?