Using the CBCT image as a map, Navident guides dentists just like a GPS guides drivers. The dental surgeon plans where implants should be placed in the image. Navident, constantly tracking the drill and
the patient's jaw, provides clear drilling guidance and visual feedback to ensure the implants are placed according to plan. This provides a range of benefits:
- Reduces errors. With Navident, implants are typically placed 3 times more accurately than freehand, providing increased safety and improved esthetics.
- Enables flapless drilling, which reduces chair time, patient trauma, pain, and recovery time.
- Reduces or eliminates the need for bone augmentation, saving time, cost, pain and hassles.
- Reduces dentist anxiety and allows less experienced dentists to perform as well as highly experienced ones.
- Maximizes flexibility . the plan can be modified at any time, even during operation.
- Attracts patients by providing a clear and visible competitive advantage
Dynamic navigation systems have been successfully tested since the early 2000s, and proven to provide these benefits in numerous papers. They have not gained
widespread use, however, mainly due to
their high purchase price and to usage difficulties caused by their immature design. Navident is different. It is affordable, practical and robust.
A simple, yet highly flexible system.
Navident consists of four main components:
- A small, lightweight, notebook computer positioned above the patient's chest. The Navident software running on the computer provides both planning and navigation functionalities, tightly
- A handpiece attachment. The attachment consists of a universal handpiece-hugging removable metal clamp, and a specially marked plastic part, named DrillTag, which latches on the clamp in
- A customizable patient jaw attachment consisting of a stent part, named JawRef, and a matching specially marked plastic tag, named JawTag. JawRef can be formed, customized and tested for fit
directly on the patient's jaw or on a plaster model in a few minutes. The patient wears the JawRef during the CT scan and again during the surgery. Using a proprietary method, Navident is able to continuously register JawRef's
position during surgery with its
appearance in the CT scan automatically, quickly and at a very high precision.
- An optical position sensor which detects the special patterns printed on the DrillTag and JawTag and constantly reports their relative positions, to a small fraction of a millimeter, to the
Minimal operational overhead.
To allow Navident to provide accurate guidance, the dentist fits the JawRef stent to the patient's jaw in a chair-side process that takes only a few minutes. No lab is involved, and the stability of
the fit can be immediately evaluated to ensure predictable results. When a plaster model is made and guide teeth are indicated, JawRef can be fitted to the plaster model, retaining the guide teeth in place for scanning.
The patient is CT-scanned with the JawRef in place, as with any CT-guide stent. Navident is compatible with all dental CBCTs on the market, including small field ones. The CT data is loaded into
Navident and optionally, an implant placement plan is prepared by the surgeon. Navident is compatible with any implant type and size available on the market. The plan can be created and modified at any time, even during
Prior to start of drilling for implants, JawRef is placed in the patient.s mouth, the drill tag is latched on the drill clamp, and the drill axis location is calibrated in a single motion. When a
new drill bit is inserted, its length is calibrated simply by touching a point on the JawTag prior to inserting it into the mouth.
During surgery, Navident automatically infers the surgeon's intent from the handpiece's motions. When the drill bit approaches a pre-planned implant location, Navident provides a cross-hairs
display that guides the hand motions of the surgeons towards precisely locating the planned entry point, adjusting the drill axis to the planned angle, and drilling to the planned depth. Planning can also be done "on the fly"
using Navident's real-time visual feedback showing the bone densities in the region in front of the drill's tip.
Unlike with static mechanical guides, the drilling site remains open and visible. There is no friction with a sleeve which reduces tactile feedback and increases wear, and no additional risk of
overheating due to insufficient irrigation. Also, unlike with such guides, the accuracy of the navigation can be validated easily by touching visible surfaces and ensuring the tip is shown correctly on the navigation screen.
A single one-hour appointment may be sufficient, in uncomplicated cases, for a complete Navident-guided procedure, including JawRef fitting, scanning (on site), planning, flapless guided drilling
and implants insertion.
Accurate and affordable.
With its high precision optical tracking, tightly controlled production tolerances and fully automated volumetric registration algorithms, Navident is arguably the most accurate clinical navigation
system on the market. In lab experiments, accuracy better than 0.5mm/1° is routinely measured. Clinical studies (in progress) show that even inexperienced users achieve sub-millimeter accuracy in actual practice.
What good is this accuracy if its cost is out of reach? Navident's purchase price is incremental to that of a CBCT scanner and its procedure kit's cost much lower than that of custom
static guides. The cost can be easily included in the implantation procedure's pricing to patients, who gain a faster, better, less painful treatment.
Navident is currently for investigational use only. Regulatory approvals pending.