Immediate loading is attractive for obvious reasons. Patients usually do not want to spend months without fixed teeth, and when the clinical conditions are right, there is little reason to make them wait. But a full-arch case should not begin by asking, “Can I give this patient teeth tomorrow?” The first questions should be whether the natural teeth can still be predictably maintained and, if not, whether immediate implant placement is appropriate. If the implants can be placed immediately, do the biology, primary stability, prosthetic plan, and patient behavior justify immediate loading?

The clinical sequence is simple: preserve the natural tooth whenever possible. If extraction becomes unavoidable and the site is suitable, consider immediate implant placement. If the conditions are still favorable, then consider immediate loading. Each step has to earn the next one.

Start with the patient, not the torque wrench

Primary stability matters, but before looking at insertion torque, it is important to know whether the healing environment can be trusted. Systemic health, smoking, oral hygiene, and patient compliance all influence that decision. Diabetes is one condition that requires close assessment. When a patient reports that diabetes is “controlled,” reviewing a recent HbA1c is still important.

My own thresholds are deliberately conservative. Ideally, HbA1c should be below 6.0%. Around 6.4%—if the patient is compliant, medically followed, and maintains good oral hygiene—proceeding with treatment is generally reasonable. Once values reach approximately 6.7% or above, greater caution is warranted, particularly with immediate loading. These are my clinical risk-management thresholds, not universal implant cutoffs. The literature does not support one HbA1c value that determines success or failure.¹ What it does show is a broader trend toward less favorable peri-implant conditions as glycemic control worsens.²

The laboratory result is only part of the picture. A patient can have an acceptable HbA1c and still be a poor candidate if hygiene is poor or postoperative instructions are unlikely to be followed. The same applies to smoking. Implant treatment in a heavy smoker should generally be delayed until smoking has been substantially reduced or stopped. Smoking remains associated with a higher risk of early implant failure.³ Immediate loading starts with a patient who is capable not only of healing, but of protecting that healing.

Additional reading: Combatting diabetes and gum disease together with advanced oral medicine and clinical chemistry

Torque matters, but 45 Ncm is not a pass-or-fail number

When planning to immediately load a full arch, my usual target is insertion torque above approximately 45 Ncm. That is a working target, not a universal rule. The evidence supports the importance of primary stability, but there is no single torque value that guarantees success. Consensus literature on full-arch immediate loading has commonly reported inclusion thresholds around 30 Ncm and ISQ values around 60, depending on the protocol and study design.^4,5

Each implant should also be considered within the larger biomechanical system. For example, if six implants are placed and five are highly stable while one reaches around 30 Ncm, the lower-torque implant may still be included in the provisional restoration if it is located between stronger implants and will be relatively protected from functional load. A 20 Ncm implant in a terminal or highly loaded position is very different. In that situation, the implant would usually be left out of the immediately loaded provisional.

The important point is that torque numbers should not simply be added together. The stability of the whole biomechanical system must be considered: individual implant stability, implant position, distribution, and the ability of a rigid cross-arch provisional restoration to control micromovement. When uncertainty exists, resonance frequency analysis can provide an additional measurement rather than relying on torque alone.

Four implants are not automatically the first choice

Treatment planning should not begin by deciding that the patient needs an All-on-4. If anatomy and biology allow it, my preference is generally six implants in a full arch. One reason is better implant distribution and less dependence on distal cantilevers.

That does not mean four implants are inappropriate. In an elderly patient, for example, extensive augmentation may create more biological burden than benefit. In that situation, four strategically placed implants may be a more reasonable treatment than subjecting the patient to additional surgery simply to reach six.

The implant count should follow the anatomy and prosthetic plan, not the name of a treatment concept. Consensus recommendations similarly emphasize that implant number and distribution should be determined by the prosthetic design, arch form, and available bone volume.^4,5

Augmentation does not always mean the patient has to remain without fixed teeth

Simultaneous augmentation or sinus-floor elevation is generally considered a relative contraindication for immediate loading.^4,5 The word “relative” matters. Consider an upper arch where six implants are placed along with bilateral sinus augmentation. If the four anterior implants provide sufficient stability, those four implants may support the immediate provisional while the posterior implants within the augmented sites remain unloaded.

The provisional should be designed conservatively: no distal cantilever, a convex and hygienic tissue surface, reduced cusp anatomy, balanced posterior contacts in centric occlusion, and canine guidance with posterior disclusion during lateral movements. Not every implant placed during surgery has to participate in the immediate provisional.

Immediate placement is a separate decision

Immediate implant placement is often preferable when the extraction site allows it. Using the existing socket and available bone can be advantageous, but the concept should not be forced. After extraction, the remaining facial bone, socket morphology, infection, available apical or surrounding bone for stability, and soft-tissue conditions must all be evaluated. If the defect is too extensive, if acute infection cannot be predictably managed, or if adequate primary stability cannot be obtained, implant placement should be delayed.

In my own protocol, when the facial gap approaches or exceeds approximately 2 mm, it is routinely grafted rather than left unmanaged. Again, that is my clinical protocol rather than a universal cutoff. If stability is not there, attempting to rescue the idea of an immediate implant simply because the patient expected one is not justified.

The provisional is part of the diagnosis

The immediate PMMA is more than just a temporary set of teeth. It provides approximately three months of valuable clinical information, including how the patient chews, whether the planned vertical dimension feels natural, how the muscles and temporomandibular joints adapt, whether parafunctional contacts develop, and whether the patient can actually maintain the prosthesis.

For the provisional itself, my preference is rigid milled PMMA with cantilevers avoided whenever possible. Posterior contacts are balanced in centric occlusion. During lateral movements, the goal is canine guidance with posterior disclusion, while relatively shallow cusp anatomy helps reduce unfavorable lateral forces. Patients also receive strict soft-diet instructions.

Of course, patients are patients. I have had patients admit afterward that they ate a hamburger or kebab almost immediately after treatment. Experiences like that affect the way a provisional should be designed. It is better to assume that instructions will occasionally be tested.

Bruxism also warrants greater caution, but it is not automatically an absolute contraindication. If implant stability is adequate and the case is otherwise favorable, immediate loading may still be appropriate, although the approach to occlusion, cantilever, vertical dimension, and lateral contacts should become much more conservative.

Accuracy becomes more important as the span becomes longer

For complete-arch cases, my approach combines photogrammetric implant-position capture with intraoral scanning of the soft tissues and prosthetic records. Conventional intraoral scanning alone is not my preferred method for recording multiple implant positions across a full arch.

Recent systematic reviews and meta-analyses have reported improved trueness and precision with photogrammetric workflows in complete-arch implant recording compared with conventional IOS techniques.^6,7 That does not mean photogrammetry eliminates verification or guarantees passive fit. It provides another tool to reduce positional error in a prosthetic situation where small errors can accumulate across the arch.

The provisional is then milled in PMMA with a convex, cleanable intaglio surface to make hygiene easier during healing.

Fixed teeth tomorrow do not mean definitive teeth tomorrow

This is an important point to communicate clearly to patients. A fixed provisional restoration may be delivered on the day of surgery or the following day, but that does not mean the definitive prosthesis should be delivered immediately. Secondary stability needs time to develop, soft tissues need to mature, and the patient needs time to demonstrate comfort at the planned vertical dimension while the muscles, joints, and occlusion adapt.

In an uncomplicated case, my provisional phase is typically around three months. When substantial augmentation is involved, it may extend toward six months. Before moving to the definitive restoration, implant stability and osseointegration, peri-implant tissues, pain, mastication, occlusion, muscle and joint adaptation, vertical dimension, and the patient’s ability to maintain hygiene should all be reassessed.

If primary stability is inadequate for immediate loading, that should be explained directly to the patient. A few months of inconvenience is preferable to increasing biological or mechanical risk simply to satisfy a promise that should never have been made before surgery.

Immediate loading can be an excellent treatment protocol in properly selected full-arch cases, and systematic reviews report high implant survival when appropriate criteria are followed.^4,8 But that is exactly the point. Immediate loading is a clinical protocol. It should never become a promise made before the patient has been examined.

Additional reading: Digital vs. analog in implant dentistry: Is the investment worth it—or just another cost?

References

1. Eskow CC, Oates TW. Dental implant survival and complication rate over 2 years for individuals with poorly controlled type 2 diabetes mellitus. Clin Implant Dent Relat Res. 2017;19(3):423-431. doi:10.1111/cid.12465
2. Naujokat H, Kunzendorf B, Wiltfang J. Dental implants and diabetes mellitus—a systematic review. Int J Implant Dent. 2016;2(1):5. doi:10.1186/s40729-016-0038-2
3. Fan YY, Li S, Cai YJ, Wei T, Ye P. Smoking in relation to early dental implant failure: a systematic review and meta-analysis. J Dent. 2024;151:105396. doi:10.1016/j.jdent.2024.105396
4. Papaspyridakos P, Chen CJ, Chuang SK, Weber HP. Implant loading protocols for edentulous patients with fixed prostheses: a systematic review and meta-analysis. Int J Oral Maxillofac Implants. 2014;29(Suppl):256-270. doi:10.11607/jomi.2014suppl.g4.3
5. Gallucci GO, Benic GI, Eckert SE, et al. Consensus statements and clinical recommendations for implant loading protocols. Int J Oral Maxillofac Implants. 2014;29(Suppl):287-290. doi:10.11607/jomi.2013.g4
6. Pozzi A, Arcuri L, Carosi P, Laureti A, Londono J, Wang HL. Photogrammetry versus intraoral scanning in complete-arch digital implant impression: a systematic review and meta-analysis. Clin Implant Dent Relat Res. 2025;27(3):e70059. doi:10.1111/cid.70059
7. Altalla H, Alhelou H, Karaduman F, Alawawda O, Bayindir F. Comparative accuracy of photogrammetry and intraoral scanners in recordings for complete arch implant-supported prostheses: a systematic review and meta-analysis. J Prosthet Dent. 2026;135(5):e60-e70. doi:10.1016/j.prosdent.2025.10.059
8. Jiang X, Zhou W, Wu Y, Wang F. Clinical outcomes of immediate implant loading with fixed prostheses in edentulous maxillae: a systematic review. Int J Oral Maxillofac Implants. 2021;36(3):503-519. doi:10.11607/jomi.8509