With guided implant surgery, most of the decisions are made before the appointment where the implant goes in. The dentist plans the implant's position, angle and depth on a 3D model of your jaw, then a custom-made guide helps carry that plan into the mouth. Across clinical studies, implants placed this way have ended up, on average, about 1 to 1.5 millimetres from where they were planned.
That accuracy is useful, but it is not perfect, and not every implant needs a guide. Here is how the process works and when it tends to earn its place.
From scan to plan to guide
Planning starts with two sets of records. A cone-beam CT scan, a type of 3D X-ray, shows the height and width of the bone and the position of structures such as the nerve in the lower jaw and the sinus in the upper jaw. A digital scan of the teeth and gums records the surface detail. Software lines the two up into a single 3D model.
On that model the dentist chooses the implant size and decides where it should sit, working backwards from where the final crown needs to be. Once the plan is set, a surgical guide is made from it. The common type is a static guide, a rigid template that fits over the teeth or gums with sleeves that direct the drill. Dynamic guidance systems do a similar job by tracking the drill on a screen in real time.
After the implant is placed, the bone gradually bonds to its surface over the following months. Our article on osseointegration explains that healing stage.
Accurate, with a safety margin built in
The best-known summary of the evidence is a systematic review by Tahmaseb A and colleagues in Clinical Oral Implants Research in 2018. Pooling 20 clinical studies with more than 2,200 implants placed with static guides, they found an average difference between plan and result of about 1.2 mm at the top of the implant, 1.4 mm at the tip and 3.5 degrees in angle. Accuracy was better where some teeth remained to hold the guide than in fully toothless jaws.
The authors judged this accuracy clinically acceptable in most situations, but advised keeping a safety margin of at least 2 mm from important structures. In other words, a guide narrows the room for error. It does not remove it, and good planning still allows for some deviation.
What better positioning means for you
An implant's position affects much more than the surgery. Set at the right angle and depth, it supports a crown that looks natural, can be cleaned properly and takes biting forces along its length. A poorly angled implant can leave the crown bulky, hard to clean or awkward to restore.
Planning in 3D also helps keep a safe distance from the nerve and the sinus. In some cases a guide allows the implant to be placed through a small opening in the gum instead of lifting a flap, which may mean less pain afterwards, although the evidence for this is still limited. Whether that is possible depends on the bone and gum at the site.
When a guide is worth it, and when it may not be
A guide is a tool, not a requirement. A single implant in a wide gap with plenty of bone can often be placed accurately freehand by an experienced dentist after careful 3D planning. Guides tend to add more value when:
- space between teeth or roots is tight
- the nerve or sinus is close to where the implant needs to go
- the bone is thin or uneven
- several implants must line up to support a bridge or a full arch
- the site is a front tooth where small differences show
When the implant is placed also affects the plan. Our article on immediate versus delayed implant placement covers that choice.
Planning several implants together
For a bridge on implants or a whole arch of teeth, the implants need to sit in positions that work together as well as individually. 3D planning, and often a guide, helps with that. Costs for that kind of treatment are discussed in our full-arch implant cost guide.
Does guidance change the cost?
The scan, the planning time and the guide itself can add to the cost of an implant case, although in many practices they are simply part of the overall treatment plan. As a typical Australian market range, not a Lumi fee, a single implant with its crown often costs about $4,000 to $7,000, depending on the site, any bone grafting and the materials used. After your assessment you will usually receive a written treatment plan, often by email, setting out what applies to you.
Common questions
Is guided implant surgery safer?
It gives more control near the nerve and sinus because the placement is rehearsed on a 3D plan first. Freehand placement by an experienced dentist can also be safe in straightforward sites.
Will I need a 3D X-ray?
Yes, for guided surgery. The cone-beam scan is what shows the bone and the structures to avoid. At Lumi we take these on our in-house 3D X-ray unit.
Does a guide mean less pain?
Not necessarily. Where a guide allows placement without lifting the gum, recovery may be gentler, but comfort depends on the site, any grafting and how you heal.
To find out whether guided planning suits your implant, book a free implant consult through our online booking page, read more about dental implants at Lumi, or see the current deals page. If you are considering replacing a whole arch of teeth, you can also read about full-arch implants at Lumi in Melrose Park.
