The Dental Wand STA System
What is the Wand?
The Wand is essentially a computer-controlled dental injection. The flow rate of the local anaesthetic is controlled by a computer. This means that the injection is guaranteed to be slow and steady and therefore comfortable.
Many people who have had a bad experience with injections think that needles sting because the skin is pierced, but this is usually not so. Mostly, the stinging sensation is caused by the anaesthetic being fired in too quickly.
Obviously, it is possible for the dentist to control the speed with a standard syringe. But the idea of the Wand is to take out the “human error”. This can be very reassuring for people with previous bad experiences. A lot of people with needle phobia describe the Wand as their “Magic Wand”!
What does the Wand look like?
The Wand doesn’t look like a syringe. Welcome to the space age…
As you can see in the photo, the “hardware” looks similar to a miniature computer tower, but curvier. This latest incarnation of the Wand, also called the Wand STA system, has had colourful buttons added to make it look even more appealing.
On the top of the little tower sits a cartridge with local anaesthetic. A tube connects this to a pen-like handpiece (which does sport a small needle. You’ve got to get the local anaesthetic in there somehow…).
The handpiece device looks just like a ball point pen (see below).
It is even held like a pen! Because of the pen grip, it is light and easy to handle. To start the computer, the dentist uses a foot pedal (the black thingy in the photo) connected to the computer tower. The computer does the rest. That way, the operator can focus all their attention on holding the handpiece in the right position.
The flow rate is also the maximum absorption rate: this means as well as being slow and comfortable, the tooth can get more numb with less anaesthetic.
Another nifty thing about the Wand is that it has pressure feedback, so if it meets resistance, it slows down (rather than with the standard technique where some dentists might be tempted to push a little harder).
The cartridge holder, tube and wand handpiece are all single-use disposables.
A STA is born
Nowadays, the Wand is equipped with a STA (Single Tooth Anaesthesia) function (hence the name Wand® STA). The STA mode allows the tooth to be numbed with less numbness to the surrounding area. This is great if you hate the numb feeling, as the lip and tongue go far less numb, or not numb at all. It also has huge advantages for kids, as it reduces the risk of them accidentally biting their lip while numb.
The Wand STA has two modes:
- The first mode is the traditional wand technique. It now has three speeds so that the delivery can be made faster after the initial slow bit.
- The second mode is the Single Tooth Anaesthesia (STA) mode. This uses a different needle, and has a visual gauge and emits little beeps to let the operator know when they’ve placed the needle correctly.
It can even speak! For example, it will say “cruise” to let the dentist know when they can use cruise control mode.
In the following video, a dentist explains the wand:
What are the advantages?
- Looks non-threatening and almost cute. Researchers have found that the Wand induces less anxiety than any other injection method 1
- The precise control of flow rate and pressure reliably produces a comfortable injection even in potentially more difficult areas like the palate.
- Many dentists enjoy the light weight and easy handling. The penlike grasp allows the operator to rotate the handpiece, which can make it easier to glide the needle into the tissue. The traditional syringe can be quite hard on the hands (especially if your dentist is prone to getting cramps), in which case the Wand can be a blessing. Why drive a manual when you can drive an automatic?
- Some “fancy” injection techniques (the AMSA and P-ASA, for the nerds among you) are much more comfortable and effective when the Wand is used.
- You can numb a single tooth (see “A STA is born” above).
What are the disadvantages?
So why do so few dentists use the Wand if it’s that cool?
- Cost. It’s a lot more expensive than using traditional syringes, both for the machine and the disposables. And if you wanted to rely on the Wand alone, you’d have to have a backup Wand in case one breaks down sometime, which means more cost. Because the cartridge holder, tube and handpiece are disposables, there’s a larger volume of hazardous waste (and higher costs for getting rid of the extra waste).
- More plastic waste.
- Some dentists complain they lose time because it takes longer than their “standard” injection.
- Takes time (and willing guinea pigs – usually staff or other dentists) to learn.
- Takes up extra space. This can be a problem in some rooms, depending on space and layout.
- A lot of dentists are happy with their painless injection techniques and don’t see the need for it.
What people on our forum have said about the Wand
…a little spray to numb the gums then a few minutes slowly injecting small doses of anaesthetic through the computerised outlet system and I didn’t feel a thing!…My fear of needles is now a thing of the past. – from “The Magic Wand”
Not only was it painless, but it worked better than the usual injections. For anyone afraid of needles or injections, I can’t say enough good things about this system.
I didn’t even flinch when he did the freezing with The Wand…it was barely noticible! Just like many have indicated here, the Wand is truly something every dentist needs. Sure, some dentists feel its not necessary, but the regular syringes are scary!
The wand is truly awesome – it has totally changed my attitude towards visiting the dentists… I was going to have IV sedation but have now decided I’ll be ok with just the wand!
It looks like a pen and it’s wicked!
Fortunately, I found a dentist who caters to needle-phobics. He uses the wand, as well as “syringes” that don’t look like needles. I knew a shot was coming, but because I didn’t see it, I didn’t panic. It was brilliant, and the most painless injection I’ve ever had.
The wand is a gift from god.
How can I find a dentist who uses the Wand?
In the UK, you can find out which dentists in your area offer the Wand or STA system through the UK distributor, Dental Sky. They can be contacted by phone on 0800 294 4700 or by email at [email protected] Alternatively, try this search function.
If you’d like to talk about the Wand or anything else related to dental fears, visit our support forum!
- Kudo M, Ohke H, Katagiri K, et al. The shape of local anesthetic injection syringes with less discomfort and anxiety — evaluation of discomfort and anxiety caused by various types of local anaesthetic injection syringes in high level trait-anxiety people. J Jpn Dent Soc Anesthesiol 2001; 29:173–178.