All-on-four treatment is a full-arch dental implant technique that replaces all the teeth in one jaw using just four implants — with fixed provisional teeth fitted on the same day as surgery. Unlike removable dentures, All-on-four provides a permanent fixed result that functions like natural teeth from the moment the patient leaves the clinic.
Patients who have spent years managing unstable dentures, covering their mouth when they smile, or avoiding certain foods understand exactly what is at stake. All-on-four resolves all of these problems in a single surgical session. The technique uses angled posterior implants to maximise contact with available bone, which means most patients can receive fixed teeth without the need for bone grafting — significantly reducing cost, recovery time and complexity.
At Asensio Advanced Dentistry in Valencia, All-on-four treatment has been performed for over 20 years under the direction of Dr. Lucía Asensio Romero, a specialist in implantology and oral surgery. The clinic uses exclusively Nobel Biocare and Klockner implants and backs every case with a lifetime guarantee on materials. For pricing and a full overview of the treatment, see our All-on-4 dental implants abroad page.
How All-on-four treatment works
The All-on-four technique places two vertical implants at the front of the jaw and two implants angled at 45 degrees at the back. The angled design maximises the use of available bone and avoids anatomical structures such as the maxillary sinus or the mandibular nerve. This allows for immediate stability strong enough to support a fixed prosthesis on the same day.
The entire process — extractions of any remaining teeth, placement of four implants, and fitting of the fixed provisional prosthesis — is carried out in a single extended surgical session. Patients arrive in the morning and leave in the afternoon with a complete set of fixed teeth. The provisional prosthesis is worn while the implants integrate with the bone over a period of three to six months, after which the definitive restoration is fitted at a second visit.
| Stage |
What happens |
Where |
| Free consultation |
OPG X-ray, 3D CT scan, treatment plan |
Valencia — or remote preliminary assessment |
| Surgery day |
Extractions, 4 implants, same-day fixed teeth |
Valencia |
| Osseointegration |
3–6 months healing with provisional teeth |
At home in the UK |
| Final prosthesis |
Definitive restoration fitted |
Valencia |
All-on-four vs removable dentures: the key differences
Many patients arrive at Asensio having previously been treated with removable dentures and are clear about what they want to change. All-on-four addresses every major limitation of conventional removable prostheses — stability, aesthetics, comfort and bone preservation.
| Factor |
Removable denture |
All-on-four |
| Stability |
Can move when eating or speaking |
Fixed, does not move |
| Bone preservation |
Bone continues to resorb without stimulation |
Implants stimulate bone and prevent resorption |
| Daily maintenance |
Must be removed to clean |
Cleaned in place like natural teeth |
| Longevity |
Requires regular replacement |
Implants with lifetime guarantee on materials |
The cost of All-on-four at Asensio is £6,480 per arch — significantly less than equivalent treatment in the UK. View the full price breakdown on our prices page.
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Frequently asked questions about All-on-four treatment
Can I have All-on-four treatment if I have been told I have little bone?
In most cases yes. The angled implants used in All-on-four are specifically designed to maximise available bone and avoid the need for grafting. For cases of severe bone atrophy, Asensio also offers zygomatic implants as an alternative. Every case is assessed individually with a 3D CT scan before any treatment is planned.
Is All-on-four treatment painful?
The surgery is performed under local anaesthesia. Conscious sedation with nitrous oxide is available for patients who prefer it. Most patients report manageable postoperative discomfort managed with standard pain relief, and return to normal activity within a few days.
How long does All-on-four treatment take in total?
Most cases require two trips to Valencia. The consultation and surgery can be scheduled on consecutive days. The osseointegration period of three to six months is spent at home in the UK with functional provisional teeth. The second trip for the definitive prosthesis typically lasts one to two days.
What is the difference between All-on-four and All-on-six?
All-on-six uses six implants instead of four and is indicated for patients with good bone volume who want additional support. All-on-four is the more common choice because the angled implant design achieves excellent results for most patients with less surgery and lower cost. The appropriate option is determined at the diagnostic consultation.
How do I start the All-on-four treatment process?
The first step is a free consultation at Asensio, which includes a panoramic OPG X-ray and a personalised treatment plan. Call us on 0800 048 8058, email office@dentalasensio.co.uk, or visit our All-on-4 page for more information.
