When most or all of the teeth in a jaw are missing, or the remaining ones are failing, replacing every tooth with its own implant is rarely necessary. Instead, a complete arch of fixed teeth can be anchored on just four or six carefully positioned implants. The bridge is screwed in place, so it stays put when you eat, talk and laugh, and you do not take it out at night. This page explains how the concept works, who tends to be a good candidate, what happens during treatment and healing, how to keep a full-arch bridge clean and how it compares with removable dentures.
Is it right for you?
A full-arch bridge on implants is designed for people who have lost, or are about to lose, most of their teeth in the upper jaw, the lower jaw or both. It may be worth exploring if you:
- have no teeth left in one or both jaws and currently wear a full denture
- have remaining teeth that are loose, badly decayed or affected by advanced gum disease and cannot be saved in the long term
- struggle with a denture that moves, rubs or makes eating and speaking difficult
- want fixed teeth that you do not remove at night
- are in reasonable general health and prepared to look after the implants carefully
As with any implant treatment, some factors need careful discussion. Smoking, poorly controlled diabetes, previous radiotherapy to the jaws and certain bone-related medicines can affect healing and may change what your dentist recommends. Heavy clenching or grinding puts extra strain on a full-arch bridge, so it is worth mentioning at your consultation. And because the bridge is fixed, you need to be comfortable with a daily cleaning routine around and underneath it.
Sometimes a full arch is not the best answer. If several of your own teeth are healthy enough to keep, saving them and replacing only the missing ones may be the better choice. A good dentist will tell you honestly if that is the case.
How the concept works
Instead of one implant for each missing tooth, a full-arch bridge spreads the load of a whole row of teeth across a small number of implants. The implants are joined together by a rigid bridge, which makes the whole structure strong and stable.
Four implants or six?
With All-on-4, four implants support the arch; with All-on-6, six are used. Six implants spread chewing forces over more anchor points and give a little extra reserve. They are often considered when there is enough bone along the whole jaw, particularly in the upper jaw, where the bone tends to be softer. Four implants can be a good solution when bone is more limited towards the back of the mouth. Which number suits you depends on your bone, your bite and your dentist's assessment of your 3D scan, not on a fixed rule.
Why the back implants are angled
In a typical All-on-4 plan, the two front implants are placed fairly upright, while the two back implants are tilted. Angling them lets the dentist use the denser bone towards the front of the jaw while still supporting teeth further back. It also helps to steer clear of the sinuses in the upper jaw and the main nerve in the lower jaw. For many people this means a full arch can be placed without a major bone graft, though that is not true for everyone.
The bridge itself
The bridge replaces the teeth and, where needed, some of the gum and bone that have been lost, which helps support the lips and cheeks. Final bridges are commonly made from a strong framework with acrylic or composite teeth, or from ceramic materials such as zirconia. Each has its own balance of strength, appearance and ease of repair, and your dentist will explain which they suggest for you. The bridge is screwed onto the implants, so a dentist can remove it for maintenance, but you cannot take it out yourself.
Bone loss and grafting
After teeth are lost, the jawbone gradually shrinks because it is no longer stimulated by chewing. Years of wearing a denture can add to this. As a result, many people considering a full arch have less bone than they would have had with their natural teeth.
The angled-implant approach was developed partly to make the most of the bone that remains, and it often allows treatment without extensive grafting. However, if the bone is very thin or low, your dentist may recommend a bone graft or a sinus lift before or during surgery, or discuss other implant techniques suited to severe bone loss. Grafting usually lengthens the overall treatment, because the new bone needs time to mature. A 3D scan is essential here: it shows exactly how much bone you have and where, so the plan is based on your anatomy rather than on assumptions.
Your treatment step by step
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Step 1
Consultation and 3D scan
Your dentist examines your mouth, reviews your medical history and takes a 3D scan of your jaws. Photos and a scan or impressions of your bite are often taken as well, so the new teeth can be designed around your face, lip line and speech. This is the time to ask questions, talk about how you would like your teeth to look and understand the risks and alternatives.
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Step 2
Surgery
On the day of surgery, any remaining teeth that cannot be saved are removed, infected tissue is cleaned away and the implants are placed. This is usually done under local anaesthetic, often combined with sedation, and in some cases under general anaesthesia; your dentist will discuss which is appropriate for you. Treating one jaw commonly takes a few hours.
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Step 3
Fixed temporary teeth
If the implants are firmly anchored when they are placed, a fixed temporary bridge can often be attached soon after surgery, frequently within a few days. This means many people do not have to go without teeth while they heal. It is not possible in every case, though. If the implants are not stable enough, your dentist may advise letting them heal without load first and providing a removable temporary denture in the meantime.
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Step 4
Healing
Over the following months, the bone bonds to the implants and the gums settle after the extractions. This phase usually lasts several months, and your dentist will tell you what to expect in your case. While it is going on, you follow a soft diet and avoid biting hard foods with the temporary bridge, which is not designed for full chewing force.
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Step 5
The final bridge
Once healing is complete, new scans or impressions are taken and your final bridge is made. There may be a try-in stage so you can check the look and fit before it is finished. The final bridge is then screwed onto the implants, and your bite is fine-tuned so that chewing feels even and comfortable.
One trip or two?
Because the implants need to integrate before the final bridge is made, full-arch treatment usually involves at least two visits. The first trip covers the consultation, surgery and, where possible, fitting of the fixed temporary teeth, along with check-ups before you travel home. You then heal at home for several months before returning for the final bridge. Sometimes an extra visit is needed, for example if grafting is done or the final bridge needs a try-in.
Your dentist will tell you how long each stay should last and when it is safe to fly. Sending your X-rays, a recent scan and photos in advance helps with planning, although a final treatment plan can only be confirmed after an examination in person.
Recovery and aftercare
Full-arch surgery is a bigger procedure than a single implant, so it is sensible to plan a few quiet days afterwards. Swelling and bruising often peak around the second or third day and then fade. Discomfort is usually controlled with the pain relief your dentist recommends or prescribes.
During the early weeks it helps to:
- stick to soft foods that need little chewing, such as soups, eggs, yoghurt, mashed vegetables and soft fish
- avoid hard, crunchy or very sticky foods that could strain the implants or crack the temporary bridge
- use cold packs on the first day and sleep with your head slightly raised
- rinse gently as instructed and keep the area clean
- avoid smoking and alcohol while you heal
- attend all your follow-up appointments, even if everything feels fine
Your speech may sound slightly different for the first days or weeks while your tongue and lips get used to the new teeth. This usually settles as you adapt.
Caring for a full-arch bridge
A fixed bridge cannot decay, but food and plaque can collect between the bridge and the gum. If they are left there, the gums around the implants can become inflamed, and over time this can threaten the bone that holds them. Daily cleaning is therefore the single most important thing you can do:
- brush the bridge twice a day with a soft toothbrush, angling the bristles towards the gum
- use a water flosser to flush out debris from underneath the bridge
- clean around each implant with interdental brushes, special bridge floss or a small single-tuft brush
- keep up regular check-ups and professional cleanings, during which your dentist may occasionally remove the bridge to clean and inspect it
- ask about a night guard if you grind your teeth
With good care and regular maintenance, a full-arch bridge on implants can serve you well for many years. The teeth on the bridge may show wear over time and need repair or renewal at some point, while the implants beneath are intended to stay in place. Your own habits and health play a big part in how long everything lasts.
Fixed bridge or removable denture?
It helps to compare a fixed full arch honestly with the main alternatives, because each has real advantages and drawbacks.
Conventional full denture
A traditional denture rests on the gums and is held by suction and sometimes adhesive. It needs no surgery and is the quickest option. On the other hand, upper dentures usually cover the palate, which some people feel affects taste and comfort, and lower dentures in particular can feel loose. Because nothing stimulates the bone, the jaw tends to keep shrinking, so dentures often need relining or replacing over the years.
Implant-retained overdenture
Here a removable denture clips onto two or more implants. It is much more stable than a conventional denture and usually needs fewer implants than a fixed bridge. You take it out to clean it, which some people find easier. It can still move slightly, and the clips or attachments need occasional replacement.
Fixed full arch on implants
A fixed bridge on four or six implants stays in place, does not cover the palate and feels closer to natural teeth for many people. The implants also load the bone where they sit. The trade-offs are surgery, a healing period, more involved cleaning and the fact that you cannot remove the bridge yourself. For some people, individual implants with several smaller bridges may be another route, especially when there is plenty of bone.
Your personal assessment
Whether a full arch on four or six implants is right for you depends on your bone, your health and what you want from your new teeth. If you are thinking about it, you are welcome to send us recent photos of your teeth and any X-rays or 3D scans you have. Our team will look at them carefully and get back to you with an honest view of the options that may suit you and the likely next steps.
