[HỎI ĐÁP BÁC SĨ]: Can I Replace My Removable Upper Denture with a Fixed All-on-4 Arch, and How Long Should I Stay in Vietnam?

Linh Pham, 54, currently wears a removable upper denture that slips while eating and is considering a fixed All-on-4 restoration in Vietnam. A fixed full-arch implant prosthesis may provide substantially greater stability and comfort when bone, sinus anatomy, restorative space and oral hygiene conditions are suitable. For an Australian patient, treatment is usually better planned as two trips rather than one continuous stay: approximately 10–14 days for implant surgery and the provisional restoration, followed by about 4–6 months of healing, then another approximately 10–14 days for the definitive full-arch prosthesis. Additional grafting or a more complex maxillary condition may change that schedule.

Linh Pham, 54 – Australia

Condition: Currently wears a removable upper denture but is increasingly frustrated by movement and instability during meals. Linh is considering replacing it with a fixed implant-supported full-arch restoration in Vietnam.

“I currently wear a removable upper denture and I'm tired of it slipping when I eat. Can I switch to a fixed All-on-4 arch, and how long would I need to stay in Vietnam for the whole process?”

Hello Linh. Yes, moving from a removable upper denture to a fixed All-on-4-type prosthesis is certainly possible for many patients, and dissatisfaction with denture movement during eating is one of the common reasons people consider an implant-supported fixed arch.

The important qualification is that I would not make the decision simply because your denture slips.

Before recommending All-on-4, I need to know whether your maxillary bone allows four implants to be placed in useful prosthetic positions, how much bone has been lost after wearing the denture, where the maxillary sinuses are located, how much lip and facial support your current denture provides, and whether a fixed prosthesis can be designed so that you can clean underneath it effectively.

If those conditions are favorable, a fixed full-arch prosthesis can give you something a conventional removable denture cannot: the teeth are retained by implants and are not removed by you for routine daily use. That generally provides much greater stability when speaking and chewing.

International Team for Implantology consensus data support both implant-retained removable prostheses and fixed complete-arch prostheses as effective treatments for edentulous patients. When clinically appropriate, fixed complete-arch prostheses can provide particularly high levels of stability, retention and comfort. At the same time, removable implant prostheses are generally easier for some patients to clean, so “fixed” is not automatically the best design for every edentulous upper jaw.

For you, the decision should therefore be based on both function and anatomy, not only on the frustration of having a denture that moves.

What I would assess	Why it matters for switching to fixed All-on-4
Available maxillary bone	Four implants need to be placed in positions that provide appropriate support for the planned full-arch prosthesis, not simply wherever some bone remains.
Maxillary sinus anatomy	Posterior bone loss and sinus expansion can limit implant positions. Angled posterior implants may reduce the need for sinus augmentation in selected cases, but All-on-4 does not guarantee that grafting can always be avoided.
Primary implant stability	This is critical if a fixed provisional restoration is intended early after surgery. The stability of each implant must be confirmed clinically.
Lip and facial support	Your removable denture may replace not only teeth but also a substantial amount of lost gum and bone volume. A fixed bridge has different contours and may not provide the same amount of flange-based lip support.
Restorative space	There must be enough vertical and horizontal room for the implants, abutments, framework and prosthetic teeth without creating an excessively bulky restoration.
Ability to clean underneath a fixed bridge	A fixed full-arch prosthesis still requires daily cleaning underneath it. If the design needed to replace severe tissue loss becomes very bulky or difficult to clean, another prosthetic design may be more appropriate.

The upper jaw deserves particular attention because many long-term denture wearers have already experienced a considerable degree of maxillary ridge resorption.

As bone volume decreases, a conventional denture may gradually lose the fit it once had. This is one reason a denture can begin to move during eating even if it worked reasonably well when it was first made.

Implants can address the retention problem in a fundamentally different way because the prosthesis receives support from implants anchored in the jawbone rather than relying primarily on suction, denture borders and the residual ridge.

However, the amount of tissue your current denture replaces is important.

A removable upper denture usually has a broad acrylic base and often a labial flange. In patients with significant maxillary bone and soft-tissue loss, that flange may contribute noticeably to upper-lip support.

If I simply remove that denture and replace it with a much smaller fixed bridge, your teeth may become stable but your upper lip may look less supported.

This is why the fixed-versus-removable decision in an edentulous maxilla is not just a question of whether enough implants can be placed.

I also need to determine where the prosthetic teeth need to be in relation to the bone.

If the teeth can be positioned appropriately over the implant foundation and sufficient missing tissue can be replaced with a cleansable fixed prosthesis, All-on-4 or All-on-6 may be an excellent solution.

If an unusually large volume of lost tissue has to be replaced to support the lip and restore facial contours, an implant-supported removable prosthesis can sometimes be the more appropriate design despite the patient's initial preference for fixed teeth.

The advantage of that approach is not that it is “less advanced.” It is that a removable prosthesis can use a larger flange to replace missing tissues while still receiving strong implant retention.

In your case, because the main complaint is slipping during meals, I would compare the two options rather than automatically assuming that the only solution is All-on-4.

Fixed full-arch prosthesis	Implant-supported removable prosthesis
Patient does not routinely remove the teeth.	Patient removes the prosthesis for cleaning.
Provides a very high level of stability and retention when properly designed.	Implants greatly improve retention compared with a conventional denture, although the prosthesis remains removable.
Often preferred by patients who strongly dislike denture movement.	Can be particularly useful when substantial lip and tissue support must be replaced.
Cleaning underneath the bridge requires specific techniques and daily commitment.	Generally easier for the patient to remove and clean directly.
Requires sufficient prosthetic space and implant positions compatible with a cleansable fixed restoration.	May tolerate larger tissue-replacement requirements without making the fixed bridge excessively bulky.

If your examination shows that a fixed restoration is appropriate, the next question is whether four implants are actually the correct number.

All-on-4 is not automatically the best plan simply because you are replacing a denture.

The ITI consensus on complete-arch fixed prostheses found no statistically significant implant or prosthesis survival advantage in the maxilla simply from using five or more implants compared with fewer than five. However, the same consensus emphasizes that the final prosthetic plan, bone volume, arch form, anatomy and implant distribution should determine the surgical plan.

Therefore, four well-distributed implants may be sufficient in one patient, while six strategically positioned implants may provide a better prosthetic foundation in another.

I would not recommend All-on-6 simply because six sounds stronger, and I would not select All-on-4 simply because it requires fewer implants and appears easier for an overseas patient.

Your CBCT and the position of the planned teeth should decide.

If you are suitable for full-arch dental implant treatment, the travel schedule from Australia is another important part of planning.

You would normally not need to remain in Vietnam continuously for the entire 4–6 month biological treatment period.

For an uncomplicated international case, I would generally aim to organize treatment into two major trips.

The first trip is the surgical and provisional phase. The second trip takes place after osseointegration for the definitive prosthesis.

Based on Dr. Care's current full-arch workflow, I would advise an overseas patient to reserve approximately 10–14 days for the first stay rather than arriving for only three or four days.

This is a practical travel allowance, not a guarantee that every patient will require exactly the same number of days.

The reason is that the current full-arch workflow includes implant surgery followed by a provisional base try-in approximately two days later, a wax-tooth try-in approximately two days after that, delivery of the provisional fixed teeth after the trial stages, and an occlusal review in the following days.

If you are flying back to Australia, I would prefer to complete those early checks while you are still in Vietnam rather than fit the provisional teeth and have you board an international flight immediately afterward.

Treatment period	What would generally happen	Suggested planning for an Australian patient
Before flying to Vietnam	Send medical history, medication list, existing dental records and any recent panoramic radiograph or CBCT if available. This is useful for preliminary screening but does not replace the final examination in Vietnam.	Can be organized remotely before travel.
Trip 1	In-person examination, CBCT, medical assessment, final prosthetic planning, implant surgery, provisional records and try-ins, delivery of the provisional restoration and early bite review.	Approximately 10–14 days is a sensible travel window for planning purposes in an uncomplicated case.
Healing period in Australia	The implants undergo osseointegration while you use the provisional prosthesis according to dietary and hygiene instructions. Remote follow-up is maintained when clinically appropriate.	Usually approximately 4–6 months; Dr. Care's current international-patient pathway commonly schedules the return around the 6-month point.
Trip 2	Assessment of implant integration, definitive implant records, verification procedures, jaw-relation records, esthetic trial, bar/framework trial, definitive delivery and occlusal adjustment.	I would again reserve approximately 10–14 days because the definitive full-arch restoration involves several accuracy and esthetic checkpoints.

This means that, in a straightforward case, you should think of the “whole process” as roughly 4–6 months from surgery to the definitive arch, but you would not spend those months in Vietnam.

Your actual time physically in Vietnam may be roughly two stays of around two weeks each.

That schedule can change.

For example, if your upper jaw has enough bone in strategic positions and the four implants achieve appropriate primary stability, a fixed provisional restoration can be planned during the first treatment phase.

If the implants do not reach the stability needed for immediate loading, I would protect osseointegration rather than attach a fixed load simply because you need to return to Australia.

According to ITI consensus recommendations, primary implant stability is critical for predictable osseointegration, and the stability of each implant should be confirmed before immediate loading of an edentulous arch.

ITI also identifies substantial simultaneous bone augmentation or sinus floor elevation as a relative contraindication to immediate loading.

This is particularly relevant in your upper jaw because long-term denture wear is often accompanied by posterior maxillary bone loss.

All-on-4 may sometimes reduce the need for a sinus graft because the posterior implants can be strategically angled to use available bone anterior to the sinus. However, I would not promise you a graft-free procedure until I have reviewed the CBCT.

If there is simply not enough bone in the positions required for a stable prosthesis, the correct approach may be bone augmentation, sinus treatment, a different implant configuration or a staged procedure.

In that situation, you may require a longer healing interval or occasionally a third trip.

Clinical situation	Likely effect on your Vietnam schedule
Good strategic bone and suitable primary implant stability	A two-trip pathway is often realistic: surgery/provisional restoration, then return after osseointegration for the definitive arch.
Posterior bone loss but four implants can still be appropriately distributed without major augmentation	A two-trip plan may still be possible depending on actual implant stability and prosthetic design.
Major sinus augmentation or bone reconstruction is required	Treatment may need to be staged. Healing can be longer and an additional trip may be necessary.
Implants can be placed but do not achieve the stability required for immediate fixed loading	The provisional plan has to change. The long-term implant prognosis takes priority over an immediate fixed bridge.
Severe ridge loss means a fixed bridge cannot provide adequate lip support without becoming bulky	I would discuss an implant-supported removable design rather than forcing a fixed All-on-4 solution.
Unexpected healing or prosthetic issue	An additional clinical review may be required rather than waiting until the next scheduled international trip.

I also want to distinguish the provisional restoration from your definitive teeth.

Patients sometimes hear “fixed teeth soon after All-on-4” and assume the treatment is completely finished during the first stay.

It is not.

Immediate loading means that an implant-supported restoration is connected within the early period after implant placement. The implants are still biologically healing underneath that restoration.

Your provisional arch therefore has two jobs: it gives you teeth to smile, speak and function with, but it also has to protect the new implants from excessive forces while osseointegration develops.

You would normally be placed on a controlled diet and instructed not to test the new bridge with very hard, chewy or crunchy foods simply because it feels stable.

A full-arch provisional restoration splints the implants together, which can make the arch feel very secure. That sensation should not be confused with complete osseointegration.

The definitive restoration comes later.

Dr. Care's current full-arch pathway separates the initial implant/provisional phase from the definitive restorative phase after implant integration. For patients who live far away or overseas, the clinic maintains contact during healing and currently describes a return at approximately six months to begin the definitive phase.

The second trip is also not simply a one-hour visit to exchange the temporary bridge for a permanent one.

A definitive full-arch prosthesis is a precision reconstruction involving multiple implants. Dr. Care's current workflow includes an initial definitive impression, a second verification stage, jaw-relation records, an esthetic wax-tooth trial, bar and tooth verification, definitive delivery and further occlusal adjustment.

If one of those verification stages is not sufficiently accurate, it should be repeated.

That is why I recommend keeping approximately 10–14 days available for the second trip when traveling from Australia. This is a practical buffer so that the laboratory and clinical team are not forced to accept a compromised step because your flight leaves the next morning.

For the same reason, I would not purchase a non-changeable second-trip ticket six months in advance based solely on the calendar.

Osseointegration should determine when the definitive prosthesis begins.

If your clinical review shows that the implants need additional healing, delaying the definitive arch is preferable to completing it early simply because the flights have already been booked.

Your treatment would continue to follow the standard clinical dental implant protocol, which includes health assessment, CBCT evaluation, treatment planning, implant placement, healing assessment and final prosthetic reconstruction.

For an overseas patient, the aim is to combine appointments intelligently, not to remove medically necessary steps.

Between the two trips, remote follow-up can reduce unnecessary international travel. However, remote review is not a substitute for urgent examination if you develop symptoms such as persistent or increasing pain, swelling, drainage, a loose provisional bridge, a fracture or a significant change in your bite.

If such a problem occurs after you have returned to Australia, you should contact Dr. Care promptly. Depending on the issue, the clinic can determine whether it can be monitored remotely, whether a local Australian dentist can assist with an interim examination, or whether an earlier return is necessary.

For cost planning, Dr. Care's current dental implant price list lists the implant component of one All-on-4 arch as follows:

Implant system	All-on-4 implant component / arch
Neodent	VND 109,000,000
JD Dental Care or Straumann SLA	VND 129,000,000
Nobel Active or Straumann SLActive	VND 149,000,000

These figures are for the implant component and currently include VAT, but they do not include the definitive fixed full-arch prosthesis.

The definitive All-on-4 prosthetic options currently range from VND 30,000,000 to VND 74,000,000 per arch depending on the material and bar design.

Therefore, using the currently listed combinations, a complete All-on-4 treatment consisting of the implant component plus the definitive prosthesis is approximately VND 139,000,000–223,000,000 per arch before any additional grafting or other individually required procedures.

If your CBCT shows that All-on-6 is more appropriate, the current implant-component range is VND 158,000,000–218,000,000 per arch, with the definitive prosthesis priced separately.

If DCARER dynamic navigation is clinically indicated to assist implant positioning, the current additional fee is VND 5,000,000 per case.

I would not choose the most expensive implant system simply to try to shorten your stay in Vietnam.

A particular implant design or surface may form part of the treatment decision, but immediate fixed provisionalization still depends on your bone, implant distribution, primary stability, occlusion and overall treatment plan.

No implant brand can guarantee an immediate fixed bridge if the implants are not sufficiently stable.

From a travel perspective, I would therefore suggest that you think about the treatment in this way:

If your case is uncomplicated	Practical plan
Number of major Vietnam trips	Usually plan around 2 trips.
First stay	Approximately 10–14 days for final assessment, surgery, provisional stages, provisional delivery and early occlusal review.
Time back in Australia	Approximately 4–6 months of osseointegration and provisional use, with remote follow-up where appropriate.
Second stay	Approximately 10–14 days reserved for definitive records, verification, esthetic and framework trials, final delivery and bite refinement.
Total biological treatment time	Usually around 4–6 months or longer depending on healing, even though only part of that period is spent in Vietnam.
When a third trip may become necessary	Major grafting, staged sinus treatment, inadequate implant stability for the original protocol, an unexpected healing complication or a definitive prosthetic stage that cannot safely be completed during the planned second visit.

Because you are currently wearing a removable denture, I would also ask you to bring that denture to your first appointment even if you dislike it.

It provides useful information.

I can see how much lip support it currently gives you, where the teeth are positioned, what you like and dislike about the appearance, whether the bite has collapsed over time, and how much tissue volume the denture is replacing.

That information can help us design the provisional and definitive implant prostheses rather than starting from zero.

If you have photographs from before losing your upper teeth, particularly a natural smiling photograph, those can also be useful when planning tooth length, smile line and facial support.

Before flying from Australia, you can send Dr. Care your existing dental radiographs, medical history and medication list for preliminary review. If you already have a recent CBCT, it can also be reviewed initially, although a final treatment plan may still require updated imaging and an in-person examination.

My recommendation for you, Linh, is therefore not simply “yes, replace the denture with All-on-4.”

The better answer is that a fixed implant-supported arch is a very reasonable option to investigate when a conventional denture is repeatedly slipping and affecting eating, and it can provide substantially greater retention and stability when properly indicated.

But before committing to fixed treatment, I would make sure your upper jaw has the necessary implant foundation and that the fixed design can replace the missing teeth and tissues without compromising facial support, speech or cleaning access.

If those conditions are met, I would generally plan your treatment from Australia around two stays in Vietnam rather than one continuous stay: roughly 10–14 days for the first surgical/provisional phase, approximately 4–6 months of healing back in Australia, and roughly 10–14 days for the definitive restorative phase.

If your maxilla requires substantial grafting, sinus augmentation or a staged treatment approach, the number of trips and the interval may increase.

This consultation is for general guidance only because I have not yet seen your CBCT, residual ridge anatomy, sinus position, lip-support requirements, occlusion or medical history. Those findings are what determine whether fixed All-on-4 is truly the best replacement for your current removable denture and whether a two-trip international schedule is appropriate for your specific case.

References

International Team for Implantology. Loading Protocols for Fixed Prostheses in Edentulous Jaws — ITI states that primary implant stability is critical before immediate loading and that substantial simultaneous bone augmentation or sinus floor elevation is a relative contraindication to immediate loading.
International Team for Implantology. Number of Implants Placed for Complete-Arch Fixed Prostheses — Evidence does not demonstrate that simply using five or more implants improves maxillary full-arch implant or prosthesis survival compared with fewer than five; the definitive prosthetic plan, anatomy and implant distribution should guide implant number.
International Team for Implantology. Treatment Effect of Implant-Supported Fixed Complete Dentures and Implant Overdentures on Patient-Reported Outcomes — Both fixed and implant-supported removable prostheses improve stability and comfort compared with conventional complete dentures; fixed complete-arch prostheses may provide the highest levels of stability and retention when clinically indicated.
Goodacre C, Goodacre B. Fixed vs removable complete arch implant prostheses: A literature review of prosthodontic outcomes — Reviews the advantages, complications and patient-related considerations involved when selecting between fixed and removable implant-supported complete-arch prostheses.
Dr. Care Implant Clinic. Full-Arch Dental Implant Treatment — Current All-on-4/All-on-6 pathway at Dr. Care, including provisional stages, approximately six months of integration for overseas patients and the subsequent definitive prosthetic workflow.
Dr. Care Implant Clinic. Standard Clinical Dental Implant Protocol — Current Dr. Care information on CBCT assessment, treatment planning, implant surgery, postoperative review and the usual 3–6 month integration period.
Dr. Care Implant Clinic. 2026 Dental Implant Price List — Current reference prices for All-on-4, All-on-6, definitive full-arch prostheses and DCARER Navigation.

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