Tooth loss is not merely an aesthetic issue; it is a serious health problem that brings with it numerous negative consequences, ranging from eating habits to speech disorders and from loss of self-confidence to facial collapse. Whereas removable dentures were the only solution for cases of complete tooth loss in the past, today the All-on-4 treatment concept offers patients the opportunity to have fixed, functional, and aesthetic teeth on the same day.
In this comprehensive article prepared by Dento Dream, we will explain what All-on-4 treatment is, how it is applied, and other details.
What is All-on-4?
The All-on-4 treatment concept is a rehabilitation method that provides a full jaw restoration (bridge) fixed on just four implants for patients who are completely edentulous or who will lose their teeth in the near future.
The most fundamental difference between this method and traditional implant treatments is that it utilizes the existing bone to the maximum extent.
Why Only Four Implants?
The name 'All-on-4' comes from the fact that all teeth in a jaw (All) are placed on just four (4) implants. The system's success relies on the strategic placement of the implants:
1. Front region implants: Two implants are placed vertically (axially) in the front part of the jaw.
2. Posterior implants: Two implants are placed in the posterior region at an angle of up to 45 degrees.
Why Are the Implants Placed at an Angle?
Placing the implants at an angle in the posterior region offers several critical advantages:
Increases Bone Support:
Angled placement increases the implant's contact surface with the bone, providing stronger support.
Preserves Anatomical Structures:
It allows implants to be placed without damaging vital structures such as the sinus cavities in the upper jaw and the mental nerve (jaw nerve) in the lower jaw.
Reduces the Need for Bone Grafting:
In cases where bone dust (graft) supplementation is normally required due to bone resorption in the posterior regions, the angled placement allows utilization of existing sound bone and avoids invasive surgical procedures.
When is All-on-4 Treatment Used?
The most common reasons for getting All-on-4 therapy are:
- Losing all of your teeth in your jaw – when the patient has lost all teeth in the lower, upper, or both jaws, or when remaining teeth can't be saved.
- Problems with removable dentures – when dentures don't work well, aren't comfortable, or don't look good; when the denture is loose, makes speech difficult, or hurts the gums.
- Limited bone volume – this treatment makes the most of existing bone without the need for bone grafting.
- Need for same-day teeth – when the patient wants fixed, functional teeth on the same day as the surgery.
The Process of All-on-4 Treatment
The All-on-4 therapy idea is a groundbreaking way to use modern technology and biomechanics to greatly improve patients' quality of life in just one day. It is one of the best options for patients who want to stop feeling insecure and uncomfortable with removable dentures, eat freely again, and smile with confidence. The first and most crucial step in finding out if this therapy is right for you is to have a thorough conversation with your dentist. All-on-4 treatment needs careful planning and execution.
Steps to Your New Smile
From planning to permanent teeth
Planning & Examination
The initial step is to check the patient's overall health, gums, and jawbone structure. A 3D map of the jawbone is made with CBCT scans. Computer software shows the best places and angles for the implants.
Surgery
Most of the time, the surgery is done with local anesthesia. Any teeth that are loose or can be pulled out are taken out, the bone is shaped, and four implants are put in at specific angles. A surgical guide may be used for precise placement.
Temporary Restoration (Same Day)
After the implants are put in, multi-unit abutments are affixed right away. The same day, an acrylic temporary bridge is screwed onto the implants if they are tight enough (torque value usually at least 35 Ncm).
Healing Phase
It takes between 3 and 6 months for the implants to properly fuse with the bone. Patients keep using their temporary teeth during this time. Stick to a soft diet and avoid hard foods so the bone can join with the implant.
Final Restoration
After the healing process is over, the temporary bridge is removed and new measurements are made. In the lab, a permanent final bridge is made to fit your oral structure and aesthetic needs, then fastened into the implants.
Why Choose All-on-4?
All-on-4 has a lot of benefits over standard implant procedures or detachable dentures:
Considerations After All-on-4
Disadvantages
The All-on-4 treatment idea has a lot of good points, but it also has some problems, hazards, and limits, such as the following:
- Requirement for primary stability: The main benefit of the therapy, the "same-day teeth" (instant function) aspect, is that the implants must reach a torque value of at least 35 Ncm during installation. If this tightness can't be reached, the patient can't get their teeth fitted right away. Instead, they have to wait 3 to 6 months without teeth or with a detachable prosthesis.
- Bone reduction surgery requirement: If the patient's "smile line" is too high, the line where the prosthesis meets the natural gum may be apparent. Some trimming of the jawbone (alveolar bone reduction) may be necessary during surgery to fix this cosmetic problem.
- Short-term speech and functional problems: The gums may be red, swollen, and painful during the first few days after surgery. Patients may also have trouble speaking, like lisping, at first, but this normally goes away in a few days.
- Strict dietary restrictions: Patients must eat soft foods during the osseointegration process (around 3 to 6 months) to avoid putting too much stress on the implants and damaging them.
- Hygiene and gum disease risk: Even though prosthetic teeth don't decay, there is still a chance that gum disease will develop around the implant. Regular professional checkups and careful oral hygiene (using interdental brushes and dental floss) are very important because this can cause the implant to fail.
- Cost: All-on-4 is a complicated technique that needs a lot of skill and unique parts, like multi-unit abutments and CAD/CAM bridges. As a result, the price could be exorbitant.
The All-on-4 System's Materials and Restoration Choices
The parts that make up the All-on-4 system are made of biocompatible materials that last a long time.
Implants:
These parts, which are usually constructed of titanium, serve as fake tooth roots.
Abutments:
These are parts that connect to the implants and fix the angle while also supporting the prosthesis. There are options at different angles, such as 17° and 30°.
Choices for Prosthetics:
Basic: Acrylic gums and teeth on a titanium frame. Medium: A titanium frame with a composite coating that looks good and is easy to fix. Premium: Zirconium or ceramic crowns are glued to a titanium bridge one at a time, making the bridge look and last the best.
Who is a Good Fit for All-on-4?
Statistics show that nearly 95% of people who have lost all of their teeth or are going to lose them are good candidates for All-on-4 therapy. The following are the requirements for candidates:
- Enough bone volume (the upper jaw should be at least 10 mm high and the lower jaw should be at least 8 mm high, and the width should be at least 5 mm).
- No major systemic disease, like uncontrolled diabetes.
- No serious parafunctional habits, like grinding your teeth too much.
What Should You Think About After All-on-4 Treatment?
The All-on-4 treatment idea gives patients functional teeth on the same day, but how well it works and how long it lasts depends a lot on how well they take care of themselves after the surgery and how often they come back for checkups. The most important stages and processes that need to happen after treatment are as follows:
The Initial Few Days and the Time It Takes to Heal
The time just after treatment is particularly important for the implants to biologically fuse with the jawbone (osseointegration). The first few days after surgery are the most delicate time, so the surgical site needs to be kept safe.
- Oral hygiene: Don't brush the region around the surgery for the first few days. Instead, use mouthwashes that your dentist suggests, or rinse your mouth with water that has a little salt in it.
- Pain control: It's common for the gums to be a little red, swollen, or painful following surgery. This normally goes away on its own within a few days.
- Speech adaptation: Some patients may have a minor lisp initially, but their tongue will become used to the new prosthesis in a few days and go back to normal.
Food and Nutrition
When implants are osseointegrating (typically 3 to 6 months), they shouldn't be put under too much stress:
- Requirement for a soft diet: Patients must be fed soft meals while they are recuperating. Eating hard meals can hurt implants that haven't fully integrated yet and make them fail.
- After getting a permanent prosthesis: Patients can go back to chewing normally and eating normally 4 to 6 months after getting the permanent bridge (final restoration).
Daily Cleaning and Care for the Long Term
All-on-4 prostheses don't rot like real teeth do, but the most important thing that affects how long the system lasts is keeping the tissues around the implant healthy.
- Brushing every day: You should clean your prosthesis at least twice a day with a regular soft toothbrush. This is needed to get rid of food scraps and keep the surface clean.
- Flossing: Use floss or interdental brushes made for implants to get rid of food and plaque that has built up behind the dentures.
- Health of the gums: Not taking care of your mouth might cause gum disease (peri-implantitis) around the implant and foul breath. One of the most prevalent reasons for losing an implant is gum disease.
Professional Check-Ups:
The system has to be checked by professionals to last:
- Regular check-ups: Patients should see the dentist once or twice a year. The implants' stability, the prostheses' condition, and the gums' health are all checked during these check-ups.
- Care and cleaning: The dentist uses special tools to clean regions that the patient can't clean at home, which makes the system last longer.
All-on-4/All-on-6: Which Should I Choose?
The comparison table we have prepared to help you decide is below:
| Criterion | All-on-4 | All-on-6 |
|---|---|---|
| Basic Principle | Achieve maximum support with a minimum number of implants (4 per jaw). | Create a broader, more balanced support structure with more implants (6 per jaw). |
| Bone Condition | Often the first choice for patients with moderate bone loss. Angled posterior implants frequently avoid the need for bone grafting. | Suitable for patients with adequate bone volume (not severe resorption). May sometimes require bone grafting. |
| Prosthetic Support | A fixed bridge supported by 4 implants. Provides sufficient and reliable support. | Theoretically, has a wider support area. Chewing forces are distributed across more implants. |
| Cost | More economical (fewer implants, surgical components, and lower prosthetic lab costs). | More expensive (cost of 2 extra implants and additional prosthetic components). |
| Long-Term Durability | Excellent and well-documented long-term success rates (20+ years). | The additional support points may theoretically contribute to a longer prosthetic lifespan, but this is not an absolute rule. |
| Chewing Function | Provides excellent chewing function. Most patients eat normally. | Designed for maximum chewing force and stability. Can be advantageous for patients with strong jaw muscles or who prefer a very rigid feel. |
| Prosthesis Design | The back part of the bridge may sometimes be shorter due to the limited number of implants. | Allows for a prosthesis with a potentially more natural, broader design and sometimes more teeth, as it's supported by more points. |
F.A.Q.
You won't feel any discomfort during the surgery because of the anesthesia. There may be some swelling, redness, or pain after the surgery, but symptoms normally go away in a few days.
All-on-4 costs different amounts based on the quality of the materials used (acrylic, porcelain, etc.), the clinic's equipment, and any more surgeries that may be needed. However, it is a less expensive option than older methods that require 8–10 implants.
For the first few days, you could notice a slight slur or lisp (whistling-like speech), but the tongue quickly gets used to the new prosthesis, and speech goes back to normal.
For patients with severely resorbed bone, the All-on-4 concept can also be applied using advanced techniques such as 'zygomatic' (cheekbone) implants.
All-on-4 implants are generally planned to serve for a very long time; however, whether this period is 'lifelong' largely depends on the patient's care discipline and regular follow-up with the dentist.
Unlike traditional removable dentures, this system does not experience issues such as loosening, slipping, or wear caused by friction on the gums; this increases the mechanical lifespan of the system.
However, the lifespan of the denture used varies depending on the material and usage:
Acrylic (plastic) teeth and acrylic palate: Generally used in economical protocols. Wear, discoloration, or breakage may occur after 5-8 years. May require maintenance and repair.
Porcelain/ceramic teeth and zirconia framework: the most durable and aesthetic option. More expensive but lasts 10-15 years or longer. There is a possibility of wear on the chewing surfaces or, rarely, breakage.