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Sinus Lift & Advanced Procedures

Oral Implantology • NEET MDS Study Guide • AI-Generated Notes

⭐ High-Yield Facts for Exam

  • Lateral window = severely reduced bone (<~5 mm).
  • Crestal/osteotome = moderate bone (6-9 mm).
  • Schneiderian membrane must not be perforated.
  • Perforation risks graft loss/sinusitis.
  • Ridge split expands narrow ridges.

Sinus Lift & Advanced Procedures

Maxillary posterior implant placement is often limited by pneumatised sinus and reduced residual bone height; sinus floor elevation creates space and bone for implants.

Techniques

  • Lateral window (Caldwell-Luc type) approach — for severely reduced bone (commonly < ~5 mm); a window is made in the lateral wall, the Schneiderian (sinus) membrane is elevated, and graft is placed.
  • Crestal / osteotome (Summers) approach — more conservative, used when residual bone is moderate (~6-9 mm); elevates the floor through the implant osteotomy.

Key Caution

The Schneiderian membrane must not be perforated; perforation risks graft loss and sinusitis.

Other Augmentation

Ridge split expands a narrow (knife-edge) ridge to allow implant placement.

Exam Tips ⭐

Lateral window for <5 mm bone; osteotome/crestal for 6-9 mm; never perforate the Schneiderian membrane; ridge split for narrow ridges.

📝 Practice MCQs — Sinus Lift & Advanced Procedures

Q1. The membrane elevated during a maxillary sinus lift is the:
A. Periosteum
B. Schneiderian membrane
C. Buccal mucosa
D. Nasal septum
Show Answer
✅ Answer: B
The Schneiderian (sinus lining) membrane is carefully elevated.
Q2. The lateral window approach is preferred when residual bone height is:
A. Greater than 10 mm
B. About 6-9 mm
C. Less than ~5 mm
D. Irrelevant
Show Answer
✅ Answer: C
Severely reduced bone (<~5 mm) favours the lateral window technique.
Q3. A ridge split procedure is used to:
A. Reduce a wide ridge
B. Expand a narrow (knife-edge) ridge
C. Elevate the sinus
D. Remove a cyst
Show Answer
✅ Answer: B
Ridge splitting widens a narrow ridge for implant placement.
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Related Topics

Bone Grafting & Augmentation ProceduresImplant Systems & Surface ModificationsDental Implants & Osseointegration