Single Tooth Implants vs All-on-4: Full Arch Replacement Compared

A single tooth implant is one titanium (or titanium-alloy) fixture placed into the jawbone at the site of a single missing tooth. Once it integrates with the surrounding bone through osseointegration, an abutment connects a single crown to it. The procedure replaces the root and crown of one tooth in isolation, without involving or altering any adjacent teeth — a single implant replaces isolated tooth loss and nothing more.

All-on-4 is a full-arch concept: four implants are placed per arch, upper or lower, in a specific configuration — typically two implants placed vertically toward the front of the arch and two placed at an angle, commonly in the region of 30-45 degrees, toward the back. The angled posterior implants are positioned to engage denser available bone while steering around anatomical structures such as the maxillary sinus or the mandibular nerve canal, which is part of why the concept has been reported to avoid a separate sinus bone-grafting step in some patients despite treating a fully edentulous arch — a retrospective study of maxillary All-on-4 cases using trans-sinus tilted implants specifically reported this outcome over a three-year follow-up (Maló et al., 2013, European Journal of Oral Implantology). All four implants are then splinted together under one fixed prosthesis that replaces an entire arch — All-on-4 rehabilitates complete edentulism, and by definition requires four implants working as a connected unit rather than one implant per missing tooth.

The structural differences are summarised below.

This last row matters for the cost section below: dentures, the other common full-arch option, are removable, while both a single implant and an All-on-4 prosthesis are fixed once placed.

A single implant is placed in one surgical site under local anaesthesia, generally in under an hour of chair time for the placement stage itself. Traditional protocols have called for a healing interval before the crown is attached, to let osseointegration establish before the implant is loaded. That interval has been trending shorter as more evidence accumulates: a 2020 study in the International Journal of Oral and Maxillofacial Surgery examined whether a two-month healing period was sufficient to achieve osseointegration and found that, in their cohort, it was (Cassetta et al., 2020) — though many single-implant cases are still planned around a longer healing window, depending on bone quality and where in the mouth the implant sits.

All-on-4 surgery is a larger single session by design. It commonly involves extracting any remaining non-restorable teeth in the arch, placing all four implants, and — in many published protocols — connecting a provisional fixed prosthesis within 24 hours of surgery. A prospective clinical study of four-implant full-arch rehabilitation found implants were loaded within 24 hours with a screw-retained acrylic-resin provisional restoration, with the definitive prosthesis delivered around six months later once healing was complete (Hinze et al., 2010, International Journal of Oral & Maxillofacial Implants). This is the origin of the "immediate function" description often attached to the concept: a patient can leave surgery the same day with a functioning temporary set of teeth across the arch, rather than the no-prosthesis waiting period that follows a conventional two-stage single-implant placement. The trade-off is scale rather than complexity of any one step — a full-arch extraction-and-placement session under one anaesthetic has a larger surgical footprint and a longer chair session than placing a single fixture.

Post-operative recovery follows the same general course in both cases — localised swelling and soft-tissue healing around each surgical site — but is scaled to a full arch for All-on-4 rather than one tooth position for a single implant.

MediSave claims for implant surgery in Singapore run through MOH's Table of Surgical Procedures. A single endosseous implant (code SB816M) sits at surgical class 2C, with a $1,120 claim limit. The same code's own note states: "for multiple placement of implants, number of claims = number of implants placed." In practice, this means a single-tooth case has one $1,120 claim ceiling attached to the implant itself, while an All-on-4 case, placing four implants under the same code, can draw against that $1,120 limit up to four separate times — a combined claim ceiling in the region of $4,480 across the four implant placements. That figure covers only the implant placement component under this specific code; the full-arch prosthesis itself is a separate cost element not covered by this claim limit.

Because All-on-4 is frequently discussed alongside removable dentures as an alternative way to restore a full arch, the MediSave contrast with dentures is worth stating plainly. CPF's own published guidance is direct on this point: "Non-surgical dental services, including tooth extractions, crown fittings, dentures, and orthodontic braces, are not covered by MediSave." A removable denture, in other words, draws no MediSave offset at all, regardless of how many teeth it replaces, because it is classified as non-surgical — whereas the implant-placement component of an All-on-4 case, being a surgical procedure on the TOSP table, can draw against the per-implant claim limit described above.

For scale, MOH's published average fee for "implant with crown" at public institutions in 2024 ranged from $4,539 to $6,600 for a single unit across five reporting institutions. An All-on-4 case — four implants plus one full-arch prosthesis — is a substantially larger episode of treatment than that single-unit benchmark, though MOH does not publish a distinct public-institution average fee specifically for an All-on-4 case in the same benchmark table, so an itemised, site-specific quote is currently the only way to arrive at a total figure for a full-arch case. A search of MOH's Implant Subsidy List, current as of 31 July 2026, returns no dental-implant entries at all — a finding that applies equally to both single-implant and All-on-4 cases, since neither is a listed item on that particular subsidy document.

Edentulism — the loss of one or more teeth — is generally described in the literature in two broad forms: partial edentulism, where some but not all teeth in an arch are missing, and complete (or total) edentulism, where an entire arch has no remaining teeth (Aguirre Escobar et al., 2024, BMC Oral Health). Which structural option applies follows directly from where a patient sits on that spectrum, together with the condition of the jawbone and any remaining teeth — not from a general preference between the two.

At the partial end of the spectrum — one or a small number of missing teeth, with healthy remaining dentition and adequate bone volume at the specific site — a single implant is the structural fit, because it is designed to treat one isolated site without involving the teeth around it. At the complete-edentulism end — an entire arch missing, or an arch where the remaining teeth are not restorable, commonly due to advanced periodontal disease or extensive decay — a full-arch solution such as All-on-4 becomes structurally relevant, because it is built to support an entire arch of replacement teeth from four implants working together, rather than requiring one implant for every missing tooth.

Between those two ends, other structural paths exist and are not covered in depth on this page: multiple individual implants placed at several separate sites, an implant-retained overdenture that remains removable but is stabilised by a smaller number of implants, or a conventional removable denture with no implants at all. Establishing which category a given arch falls into — and therefore which structural option is even applicable — requires a clinical and radiographic assessment of bone volume and the condition of any remaining teeth; it is not something this article, or any general comparison, can determine without that individual examination.