Alveolar ridge preservation: when it will change your implant plan

Socket grafting reliably reduces ridge shrinkage by about 1–1.5 mm but does not eliminate the need for later augmentation — use it selectively where that millimetre matters (posterior maxilla, narrow ridges, patients unlikely to accept later grafting).

A new systematic review comparing alveolar ridge preservation (ARP) with unassisted socket healing joins a consistent literature: ARP reduces the average loss of ridge width and height by roughly one to one-and-a-half millimetres compared with extraction alone. This is the size of effect reported across multiple meta-analyses and the Cochrane review update — a real, measurable preservation of volume, but not a complete prevention of post‑extraction resorption. ([pubmed.ncbi.nlm.nih.gov](

What that number means in the clinic: losing 1–1.5 mm of bucco‑lingual width often does not change your ability to place a standard 3.5–4.0 mm implant if you routinely prepare the osteotomy carefully and accept minor prosthetic compromises. Where that millimetre matters is when the pre‑extraction ridge is already narrow, when you need an intact bone envelope for an aesthetic immediate restoration, or when the posterior maxilla risks sinus pneumatization. In those situations ARP shifts the odds: a focused review of DBBM (deproteinized bovine bone mineral) ARP estimated that the chance of being able to place a standard implant without any further grafting increased meaningfully (number needed to treat and probabilities depending on implant diameter). ARP makes additional sinus or block grafts less likely, but it does not abolish them. ([pmc.ncbi.nlm.nih.gov](

Material matters. Particulate xenografts (DBBM) plus a collagen membrane give the most consistent dimensional preservation on radiographic measures; they also leave a higher proportion of residual graft particles and typically need longer healing before implant placement. A recent histological meta‑analysis that pooled 22 RCTs showed that ARP preserves volume but may show a lower percent of vital new bone overall when particulate xenografts are used, because graft particles remain. Autologous concentrates (PRF/PRP family) and some protocols with membranes can show better new bone percentages but the pure radiographic volume protection is usually smaller than with DBBM. In short: xenograft = best radiographic volume; autologous biologics = cleaner histology but less predictable volume. ([pubmed.ncbi.nlm.nih.gov](

Practical protocol for a modest private clinic. 1) Be selective: offer ARP when the pre‑extraction bone is thin (<4–5 mm bucco‑lingual), when implants are planned in the posterior maxilla, when a patient wants to avoid a later hospital graft, or when delayed implant timing of 4–6 months is acceptable. 2) Keep it simple: atraumatic extraction, socket debridement, fill with DBBM (particulate) and cover with a resorbable collagen membrane or well‑adapted soft tissue seal; remove tension and aim for primary closure only when it does not distort the emergent mucosa. 3) Expect a trade‑off: DBBM gives better width/height preservation but tends to reduce the proportion of vital bone and so needs a 4–6 month healing window before implant osteotomy. If you plan earlier implant placement or demand more vital bone for immediate loading, favour protocols that combine a graft with autologous biologics or accept targeted minor GBR at implant stage. ([pmc.ncbi.nlm.nih.gov](

Cost and patient counselling. Tell patients that ARP reduces the amount of bone lost but does not guarantee a graft‑free implant later. Frame the conversation around reducing the risk and potential costs of larger grafts later (ARP lowers that risk but does not remove it). For patients who cannot return or who explicitly refuse a second surgery, ARP is often the pragmatic choice. For low‑risk sites with enough baseline width, extraction alone and careful implant planning is reasonable and cheaper. ([pubmed.ncbi.nlm.nih.gov](

How to decide on Monday morning: inspect the socket and the remaining envelope, take a quick CBCT for narrow or posterior maxillary sites, and ask whether the patient will accept a later graft if needed. If the pre‑extraction bone is borderline and the extra treatment cost and time are acceptable to the patient, ARP with DBBM + membrane is a sensible default; if the ridge is wide and the patient prefers minimal intervention, explain that spontaneous healing will usually be adequate and reserve GBR for implant stage if necessary. The new 2026 review confirms this balanced, selective approach. ([pubmed.ncbi.nlm.nih.gov](