Maxillary Sinus Lift Decision Tree
Evidence-based technique selection for maxillary sinus augmentation. Enter residual bone height, sinus anatomy, and patient factors to receive a technique recommendation (transcrestal osteotome, lateral window simultaneous, lateral window staged, short implants, or zygomatic), graft material options, healing timeline, and contraindication alerts.
⚠️ Clinical decision support only — CBCT analysis and specialist assessment are required before surgery.
Residual Bone Height (RBH) Guide
Jensen 1998 · RBH Classification
02 mm4 mm6 mm8 mm10 mm>10 mm
Zygomatic / No-graft alt.
Lateral window staged
Lateral window simultaneous
Osteotome / Transcrestal
Short implant / No lift
1. Bone Assessment
mm
Measure from crest to sinus floor on CBCT/OPG at planned implant site
2. Sinus Anatomy
3. Patient Risk Factors
Esposito's 2014 Cochrane review found similar 1-year outcomes for short implants vs sinus lifts when RBH ≥ 5 mm
Recommended Technique
—
—
Staging
—
Healing time
—
Graft needed
—
RBH range
—
Decision Pathway
Alternative Option
Graft Material Options
Pjetursson 2008 · no difference in survival by graft typeMembrane Perforation Risk
Hernández-Alfaro 2008 · Int J Oral Maxillofac ImplantsLow (literature: ~10–20% lateral window)
Clinical Planning Note
Evidence basis:
Tatum 1986 (Dent Clin North Am) · Boyne & James 1980 (J Oral Surg) · Summers 1994 (Compend) ·
Pjetursson 2008 systematic review (Clin Oral Implants Res) ·
Esposito 2014 Cochrane review · Velásquez-Plata 2004 (JOMS) ·
Chrcanovic 2015 (J Dent) · Heitz-Mayfield & Salvi 2018 (EAO Consensus).
This tool does not replace CBCT analysis or specialist surgical assessment.
Frequently Asked Questions
What residual bone height is needed to avoid a sinus lift?
A residual bone height (RBH) of ≥ 10 mm is generally sufficient for standard implants without augmentation. With RBH of 8–9 mm, short implants (6–8 mm) are a viable alternative. Esposito's 2014 Cochrane review found similar 1-year outcomes for short implants vs sinus lifts when RBH ≥ 5 mm.
What is the Summers osteotome / transcrestal technique?
Described by Summers (1994), the transcrestal technique uses progressively wider osteotomes through the implant socket to gently infracture the sinus floor and elevate the Schneiderian membrane 2–4 mm. Indicated for RBH 5–8 mm. No lateral window, simultaneous implant placement, lower morbidity than lateral window — but limited to small elevations. Contraindicated when septa are directly under the osteotomy path.
When is the lateral window technique used?
The lateral window approach (Tatum 1986, Boyne & James 1980) is indicated when RBH < 5–6 mm or when larger elevations (> 4 mm) are needed. A bony window is cut in the lateral maxillary wall, the membrane reflected, graft placed. Simultaneous implant placement if RBH ≥ 4 mm; staged if RBH < 4 mm. Pjetursson et al. 2008 reported a weighted mean implant survival of 90.1% at 3 years.
What graft materials can be used?
Autogenous bone (gold standard), xenograft (Bio-Oss — most widely used), DFDBA allograft, alloplast (β-TCP, HA). A 2008 systematic review by Pjetursson et al. found no significant difference in implant survival between graft materials. Most surgeons mix xenograft with autogenous bone (80:20) for volumetric stability plus osteogenesis.
What are contraindications to sinus lift surgery?
Absolute: active sinusitis, untreated nasal polyps, recent sinus surgery (<6 months), uncontrolled diabetes (HbA1c >8%), IV bisphosphonates (MRONJ risk), radiation to the area. Relative: heavy smoking (advise cessation ≥ 4 weeks pre-op), controlled systemic disease, sinus septa.
When are zygomatic implants used instead?
Zygomatic implants (Brånemark 1998) are indicated when posterior maxillary RBH < 3 mm, the patient declines multi-stage grafting, or previous sinus lifts have failed. They anchor in the zygomatic bone and allow immediate loading without grafting. Highly technique-sensitive — specialist referral required.