Holding the Margin in Immediate Implants

Immediate placement is the most demanding thing we do in the esthetic zone, and midfacial recession is how it fails. The instinct, when the tissue looks thin, is to reach for a graft. But margin stability isn't one move — it's a stack, and each tier can only protect what the one above it earned.

This issue assumes the foundation is already in place. Case selection and 3D position — Elian type, Kan sagittal root class, a palatal-biased shoulder, primary stability from apical and palatal bone, a fixture diameter chosen to preserve at least 2 mm of buccal gap rather than fill it — set the ceiling on everything below, and none of it is negotiable. A future issue will take that layer apart properly. What follows is what you do once the implant is in the right place: preserve what you're keeping, replace the deficit you couldn't prevent, and protect the result.

How fragile the plate actually is. Chappuis and co-workers analyzed esthetic-zone sites with CBCT and found that at eight weeks post-extraction, a facial wall of ≤ 1 mm had lost a median of 7.5 mm of vertical buccal bone — against 1.1 mm where the wall was thicker (J Dent Res 2013). That is the most sobering number in this literature, and every decision in this tier follows from it.

Atraumatic extraction. Take the tooth out with that 7.5 mm in mind. Sever the attachment circumferentially, section multi-rooted teeth rather than luxating them as a unit, work vertically along the root, and never lever against the buccal. The forceps beak that feels efficient is a lever using a millimetre of bone as its fulcrum.

Stay flapless. Raising a buccal flap severs the periosteal supply on top of the PDL supply you just removed with the tooth — you cut the plate's blood supply twice in one appointment. Flapless placement preserved about 0.48 mm more horizontal buccal bone in Pitman and Cosyn's meta-analysis (p = .007), and the combination of flapless surgery, an intact wall, a thick phenotype and an immediate crown keeps advanced recession under 10% (Cosyn 2012).

The socket shield. This is the most elegant idea in the tier, and it works. Rather than extracting the buccal root fragment and then trying to rebuild what its removal cost you, you leave it in place — and with it, the plate's own periodontal attachment, its blood supply, and the bundle bone that would otherwise resorb on schedule. Nothing you graft afterward reproduces that. The outcomes bear it out: implant survival in the 96–99% range with measurably less bone loss (Oliva 2023; Kotsakis 2023), and 96.1% survival across Gluckman's 128-case series with up to four years of follow-up.

Managing a shield exposure. The technique's one recurring complication is internal shield exposure — the fragment migrating coronally or showing through the tissue — and the reason it shouldn't put you off is that it is genuinely simple to handle. You access the site, reduce and smooth the exposed portion, and let the tissue close over it; the implant stays. A multicenter series devoted specifically to this complication documents exactly that approach (Gluckman, Pohl & Chen 2024), and in the 128-case series the complications were likewise managed or observed without implant loss. Knowing what an exposure looks like and having a plan for it is the whole barrier to entry.

The proximal shield. The same logic extends interproximally: retain a proximal fragment to support the papilla between adjacent immediates, where papilla height is otherwise dictated by the bone on the neighbouring root. It's biologically sound and clinically satisfying, though the published support is still case-report level rather than controlled.

Graft the jumping gap. This is the best-evidenced hard-tissue move in the entire sequence. Seyssens' meta-analysis of 15 RCTs found that grafting the gap with a slow-resorbing xenograft cut horizontal buccal resorption by 0.59 mm (~54%) and midfacial soft-tissue migration by 0.58 mm, at GRADE moderate certainty. Araújo's CBCT work adds the dimensional case: grafted wide gaps (> 2 mm) preserved more than 90% of ridge dimension, while narrow gaps lost about 41%. There is no good argument for leaving the gap empty.

Add a connective tissue graft. Soft tissue is the other half of the margin. A simultaneous CTG shifts the midfacial level roughly 0.41 mm coronally and cuts the risk of ≥ 1 mm midfacial asymmetry about twelvefold (Seyssens 2021); in Zuiderveld's RCT, advanced recession fell from 32% to 8%. Deliver it flaplessly through a tunnel or VISTA approach — the entire point of Tier 1 was to protect that blood supply, so don't undo it here. Timing is a wash: simultaneous and staged grafting produce equivalent thickness (Lin 2018), so there's rarely a reason to make the patient come back.

Dual zone, and the modified version. When a second surgical site isn't on the table, dual-zone grafting is the reasonable alternative. It matches CTG on esthetic scores (PES 12.1 vs 12.5, non-significant) but loses roughly twice the labial volume, and CTG holds contour better in thin-bone sites (Fettouh 2024 RCT). Carrying the particulate past the jumping gap and up into the tissue zone above the crest — the modified version — puts graft rather than clot underneath the transmucosal contour. Think of dual zone as the no-second-site option; CTG remains the volume play.

Substitutes, GBR, and biologics. Xenogeneic matrix and acellular dermal substitutes are non-inferior to CTG for thickness with less morbidity, but trend toward more contour loss at ten years (Strauss 2026) — CTG is still the reference standard when midfacial position is what you're protecting. Sockets with a frank buccal dehiscence can often still be managed at placement using internal and external xenograft with or without a membrane, holding buccal thickness at one year (Chen 2021), though that evidence is case-series level. As for biologics: L-PRF is a perfectly reasonable seal, but it has not independently improved buccal bone or margin position, and rhPDGF and EMD have essentially no controlled evidence in immediates. Use them if you like them; don't build a plan around them.

Provisionalize immediately, out of occlusion. When selection is respected, immediate placement with immediate provisionalization performs beautifully — 99.2% survival at one year and 95.8% at five, with a net gain in pink esthetic score and midfacial recession that is small and non-significant (Wittneben 2023). The caveat is that selection genuinely is everything: immediates run about 4% lower survival than delayed placement overall (94.9% vs 98.9%, Cosyn 2019), and that gap is a case-selection artifact rather than a property of the technique. If primary stability is short, don't force it — a custom or socket-sealing healing abutment shapes emergence without loading.

Contour: keep the subcritical zone concave. Su's critical/subcritical framework still governs the design. Keep the subcritical zone flat-to-concave so there is room for tissue volume, and make the critical contour a deliberate decision rather than whatever comes back from the lab.

Emergence angle only matters when the abutment is short. This is the part most people get wrong, and it's worth being precise. In our retrospective analysis of 192 implants in 119 patients, we split sites by transmucosal abutment height (TmAH) and restorative emergence angle (REA). The group with a short abutment (< 2 mm) and a wide angle (≥ 30°) — SW — lost significantly more marginal bone than every other group, and carried roughly four times the likelihood of a peri-implantitis diagnosis compared with the long-abutment groups. But the long-abutment groups did not differ from each other: with more than 2 mm of transmucosal height, a wide emergence angle stopped being a significant risk factor. Every additional millimetre of abutment height reduced the odds of any marginal bone loss (OR 0.63, p = .003). (Misch et al., Clin Oral Implants Res 2025.)

The practical translation is that emergence angle is not an independent villain — it is dangerous specifically when you have not given yourself vertical room. Buy that room where you can: place slightly subcrestal, choose a taller transmucosal component, and reserve your worry about a wide angle for the sites where you couldn't.

Plan for the access channel. Screw retention is preferable for all the usual reasons, but a straight access channel is anatomically possible only about 14% of the time in the anterior maxilla (Kan 2021). Decide how you're handling that before the provisional is made, not after.