Guided Implant Surgery
Guided implant surgery plans the implant position digitally and transfers it with a custom guide. What a guide does and does not do, how accurate it actually is, and when a flapless approach is possible.
What Is Guided Implant Surgery?
Guided implant surgery is an approach in which three-dimensional imaging and intraoral data are used together to plan an implant's position, angle and depth. A surgical guide is then made to help transfer that plan into the mouth. The aim is not only to place the implant in bone, but to assess from the outset where the tooth on top of it needs to sit.
A guide does not replace the surgeon's judgement. During the procedure, how the guide seats, and the state of the bone and soft tissue, are checked; if necessary the plan or the method of delivery is changed.
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- Records are aligned — The necessary images and intraoral records are aligned in the same digital environment.
- The planned position — The implant position is planned together with the tooth it will carry and the neighbouring anatomy.
- A custom guide — The guide helps transfer the digital plan into the mouth; it does not replace the surgeon's judgement.
- Checks and a safety margin — How the guide seats is checked throughout; the final position can differ from the plan.
- Not every digital plan is carried out with a guide.
- A guide does not increase the amount of bone available.
- Guided surgery and flapless surgery are not the same thing.
Who Is It Suitable For?
It can be considered for a single missing tooth or where several implants are planned. It is not the only usable method for every implant candidate. The examination assesses mouth opening, the existing teeth, the surface the guide will rest on, and the bone and gum.
- Bone and gum. A need for bone augmentation or soft tissue adjustment may make an open approach necessary.
- General health. Medication, diabetic control, smoking and previous treatment affect planning. Using a guide does not remove these risks.
- The prosthetic plan. Implant positions are set according to the fixed or removable prosthesis to be made.
Is Guided Surgery Always Flapless?
No. Guided surgery and flapless surgery are not the same thing. Where bone and gum conditions allow, the procedure can be done through a small opening. Where the tissues need to be seen directly, or bone augmentation or soft tissue adjustment is required, the gum is opened and sutures may be used.
Three-dimensional imaging and digital planning can also be used in freehand implant surgery. The essential difference between the two approaches is the physical guide used during the operation. It is not correct to say that one method causes less pain or fewer complications in every patient.
How Accurate Is It, Really?
This is where the published numbers matter more than the marketing. All of them are averages across studied groups.
In short, a guide improves accuracy measurably, and it introduces complications of its own. Neither half of that sentence should be dropped. "Millimetre precision" is not what these papers describe, which is why a safety margin to the nerve is planned rather than assumed away.
- Tahmaseb and colleagues (2018) pooled 20 studies covering 2,238 implants in 471 patients placed with static guides. The mean error was 1.2 mm at the entry point, 1.4 mm at the apex, and 3.5° of angular deviation. Their conclusion is explicit: accuracy is within a clinically acceptable range in most situations, but a safety margin of at least 2 mm should be respected. Accuracy was significantly better in partially edentulous than in fully edentulous cases.
- Vercruyssen and colleagues (2014) randomised 60 patients (72 jaws) between guided surgery, mental navigation and a pilot-drill template. Guided groups deviated on average 0.9 mm vertically and 0.9 mm horizontally; non-guided groups 1.7 mm and 2.1 mm. The difference was statistically significant, and the authors note that the largest remaining inaccuracy with guided surgery is in depth.
- Schneider and colleagues (2009) found mean deviation of 1.07 mm at the entry point and 1.63 mm at the apex — and reported early surgical complications in 9.1% of cases, early prosthetic complications in 18.8% and late prosthetic complications in 12%, concluding that "a considerable number of technique-related perioperative complications were observed."
Risks and the Limits of the Method
A guide that seats poorly, deviations arising from the imaging or the manufacturing, and difficult access in the mouth can all produce a position different from the one planned. Guided surgery therefore does not mean zero error, and a safety margin around anatomical structures is still needed.
Implant surgery carries risks of infection, bleeding, damage to neighbouring structures and failure to integrate. Your individual risks and the alternatives are discussed at the examination.
Recovery and Review
How much pain and swelling you have depends on what was done. Follow the instructions you are given on eating, cleaning, medication and review appointments. Maintenance and regular review are needed after a guided procedure just as after any other.
Frequently Asked Questions
Can fixed teeth be fitted the same day?
For some patients a temporary fixed prosthesis is possible. It depends on the implant's initial stability, the bone and the prosthetic plan. A temporary tooth on the day does not mean treatment is complete or that the definitive prosthesis is in place.
Does using a guide make a bone graft unnecessary?
No. Where bone is insufficient, an additional procedure or a different plan may be needed. A guide does not increase the amount of bone available.
Is guided surgery suitable for everyone?
No. Mouth opening, the support available for the guide, and the need for augmentation or soft tissue work all affect whether it can be used, and an open approach is sometimes the better choice.
How are the fee and the appointment decided?
The number of implants, manufacture of the guide, any additional surgery and the choice of prosthesis all affect the total. After the examination a personal plan setting out the stages and the scope is prepared.
Scientific References
- Tahmaseb A, Wu V, Wismeijer D, Coucke W, Evans C. The accuracy of static computer-aided implant surgery: A systematic review and meta-analysis. *Clinical Oral Implants Research*. 2018;29(Suppl 16):416-435. PMID 30328191. DOI
- Schneider D, Marquardt P, Zwahlen M, Jung RE. A systematic review on the accuracy and the clinical outcome of computer-guided template-based implant dentistry. *Clinical Oral Implants Research*. 2009;20(Suppl 4):73-86. PMID 19663953. DOI
- Vercruyssen M, Cox C, Coucke W, Naert I, Jacobs R, Quirynen M. A randomized clinical trial comparing guided implant surgery (bone- or mucosa-supported) with mental navigation or the use of a pilot-drill template. *Journal of Clinical Periodontology*. 2014;41(7):717-723. PMID 25179585. DOI
- Tatakis DN, Chien HH, Parashis AO. Guided implant surgery risks and their prevention. *Periodontology 2000*. 2019;81(1):194-208. PMID 31407433. DOI
Treatment Steps
Examination and Imaging
The missing teeth, the bite, the gums and general health are assessed, and the necessary imaging and intraoral records are chosen. Bring any previous scans and your current medication list.
The Digital Plan and the Guide
The implant and the prosthesis are planned together. Distances to structures such as the nerve and the sinus are assessed. An extra appointment may be needed to make the custom guide and check how it fits in the mouth.
Placing the Implant
The implant is placed under anaesthesia and the guide's fit is checked throughout. Operating time depends on the number of implants, additional procedures and the anatomy; a single figure does not apply to every patient.
Healing and the Prosthesis
Integration and tissue healing are followed up. When a temporary tooth can be used, and the timetable for the definitive prosthesis, are set separately. Using a guide does not shorten the biological healing of the implant.
Examination and Imaging
The missing teeth, the bite, the gums and general health are assessed, and the necessary imaging and intraoral records are chosen. Bring any previous scans and your current medication list.
The Digital Plan and the Guide
The implant and the prosthesis are planned together. Distances to structures such as the nerve and the sinus are assessed. An extra appointment may be needed to make the custom guide and check how it fits in the mouth.
Placing the Implant
The implant is placed under anaesthesia and the guide's fit is checked throughout. Operating time depends on the number of implants, additional procedures and the anatomy; a single figure does not apply to every patient.
Healing and the Prosthesis
Integration and tissue healing are followed up. When a temporary tooth can be used, and the timetable for the definitive prosthesis, are set separately. Using a guide does not shorten the biological healing of the implant.