Gow-Gates Technique for Mandibular Nerve Block

The Gow-Gates technique is a method of numbing the lower jaw for dental procedures by depositing local anesthetic near the neck of the mandibular condyle, higher and more lateral than the standard inferior alveolar nerve block most dentists use. Developed by Australian dentist George Gow-Gates in the early 1970s, the approach targets the mandibular nerve trunk shortly after it exits the base of the skull, which in theory numbs a broader territory with a single injection. It remains one of the most discussed alternatives to the conventional block, though its adoption in everyday practice has been slower than its clinical track record might suggest.

What the Technique Actually Does

In a standard inferior alveolar nerve block (IANB), the needle aims for the mandibular foramen on the inner surface of the jaw, targeting the inferior alveolar nerve after it has already branched off from the main trunk. The Gow-Gates technique takes a fundamentally different approach. The patient opens wide, and the clinician directs the needle toward the neck of the condyle, depositing anesthetic solution close to where the mandibular branch of the trigeminal nerve emerges from the foramen ovale at the skull base.¹ Because the injection site is upstream of where the nerve divides, a successful Gow-Gates block anesthetizes the inferior alveolar, lingual, mylohyoid, and long buccal nerves all at once. That means no separate buccal nerve injection is needed for procedures on the cheek side of lower molars, which the conventional block typically requires as a supplement.

The original description used extraoral landmarks to guide needle placement: the clinician identifies the intertragic notch of the ear and the corner of the mouth, then uses these reference points alongside the patient’s wide-open jaw to aim for the correct depth and angle.² This reliance on bony and surface landmarks rather than internal soft-tissue feel is part of what makes the technique reproducible once learned, but also part of what makes the learning curve steeper for clinicians accustomed to the conventional block.

How Well Does It Work Compared to the Standard Block

The honest answer is that the evidence is mixed, and where you look matters. In routine dentistry on healthy, non-inflamed teeth, the Gow-Gates technique and the conventional IANB perform similarly in terms of how often they achieve adequate numbness. A study comparing the two in patients with vital, symptom-free teeth found that for those who got lip numbness, anesthetic success rates were comparable between the techniques.³ A systematic review pooling data from multiple trials also found no significant difference in success rates between the two approaches overall.⁴

Where things get more interesting is in difficult clinical situations. When patients have irreversible pulpitis, the severely inflamed, painful molars that are the hardest teeth to numb, some evidence favors the Gow-Gates approach. A systematic quantitative review found evidence of higher efficacy for the Gow-Gates technique compared with the standard block in these cases.⁵ One clinical trial reported a success rate of 52% for Gow-Gates versus 36% for the conventional block in patients with irreversible pulpitis, a statistically significant difference.⁶

But not every study agrees. Another randomized trial in symptomatic irreversible pulpitis found success rates of 50% for Gow-Gates and 42.5% for the conventional block, with no statistically significant difference between them.⁷ And a separate study evaluating both Gow-Gates and Vazirani-Akinosi techniques concluded that neither provided adequate pulpal anesthesia for mandibular posterior teeth with symptomatic irreversible pulpitis, even in patients who achieved lip numbness. In that trial, only 35% of patients getting the Gow-Gates block achieved successful pulpal anesthesia.⁸ The takeaway is that inflamed teeth are hard to numb with any technique. The Gow-Gates block may offer a modest edge, but it is not a silver bullet.

The Onset Time Trade-Off

One consistent finding across studies is that the Gow-Gates technique takes longer to kick in. Because the anesthetic is deposited farther from the target teeth, it has to diffuse through more tissue before the nerves are fully blocked. In a direct comparison, the Gow-Gates technique had a statistically slower onset of pulpal anesthesia than the conventional IANB.⁹ Another study measured this more precisely and found the two techniques were not dramatically different in absolute terms: the IANB anesthetized the pulp in roughly 7.7 to 8.8 minutes, while the Gow-Gates technique took 8.3 to 9.3 minutes, a gap that was not statistically significant in that particular trial.¹⁰

A three-way comparison study found a more pronounced difference. The mean onset time for Gow-Gates was about 344 seconds (roughly five and a half minutes), versus about 177 seconds for the conventional block and 193 seconds for the Vazirani-Akinosi technique. The difference between Gow-Gates and both other techniques was statistically significant.¹¹ In practice, this means clinicians using the Gow-Gates technique need to plan for a longer wait before starting the procedure, something that can feel inconvenient in a busy clinic but is manageable when anticipated.

Why Volume of Anesthetic Matters

The Gow-Gates technique typically requires a larger volume of anesthetic solution than the conventional block, and this is not just a preference but a finding backed by clinical data. A pilot study that compared a standard cartridge of anesthetic (1.8 mL) against a double volume (3.6 mL) found a stark difference: the higher volume produced an 82.5% success rate, while the lower volume succeeded only 17.5% of the time.¹² Complete anesthesia within eight minutes was achieved in over half the patients receiving the larger volume, but in only one out of sixteen patients getting the smaller dose.

This makes anatomical sense. The injection site is in a relatively open tissue space near the condylar neck, and the anesthetic needs to spread to reach the nerve trunk reliably. Clinicians who attempt the technique with a single cartridge, as they might with a conventional IANB, are likely to see disappointing results. Most protocols and instructional guides recommend two cartridges as the standard for this block. The trade-off is minimal for most patients, since local anesthetic volumes in this range are well within safe limits, but it does mean using more material per injection.

Safety and the Aspiration Advantage

One of the Gow-Gates technique’s most frequently cited benefits is its low rate of positive aspiration, meaning how often the needle tip ends up inside a blood vessel. A large study of 3,000 Gow-Gates blocks reported a positive aspiration rate of just 1.6%, and the authors noted that the preferred injection site for maximum efficacy is also the site least likely to result in vascular penetration.¹³ The conventional IANB, by comparison, has historically reported positive aspiration rates in the range of 10 to 15% or higher in some series, because the injection site near the mandibular foramen sits close to the inferior alveolar artery and vein.

A randomized controlled trial comparing both techniques during surgical removal of impacted wisdom teeth found no significant difference in aspiration rates between the groups in that particular study, but the overall numbers were small.¹⁴ A modification of the Gow-Gates technique tested in a randomized trial also demonstrated a much lower positive aspiration rate in the modified Gow-Gates group (about 7%) compared to a conventional approach (about 26%).¹⁵ The lower vascular risk is a genuine advantage, particularly for patients on anticoagulants or in situations where intravascular injection could cause complications.

When the Technique Shines Most

The Gow-Gates block is most valuable when the standard IANB fails, and the most common reason that block fails is anatomical variation. Some patients have accessory nerve pathways that supply the lower teeth from directions the conventional block does not cover. Because the Gow-Gates technique anesthetizes the mandibular nerve trunk before it divides, it catches accessory branches that a lower injection would miss entirely. A review in the Journal of the American Dental Association noted that the technique is particularly advantageous when a patient has a history of standard IANB failure due to anatomical variability or accessory innervation.¹⁶

This is the clinical situation where many practitioners first learn to appreciate the technique. A patient who consistently cannot be numbed with repeated conventional blocks may get reliable anesthesia from a single Gow-Gates injection. For clinicians who see a high volume of these difficult-to-numb patients, having the technique in their repertoire is genuinely useful. It also eliminates the need for a separate long buccal nerve injection, which simplifies the workflow for molar extractions and other procedures on the cheek side of lower back teeth.

Rare but Reported Complications

Serious complications from the Gow-Gates technique are uncommon, but a few unusual ones have been documented in the literature. One case report describes a patient who developed temporary double vision (diplopia) following a Gow-Gates injection. The authors discussed possible mechanisms including accidental intra-arterial injection, intravenous injection, or diffusion of the anesthetic through tissue planes to reach the nerves controlling eye movement.¹⁷ The diplopia resolved on its own.

Another report described a patient who developed middle ear symptoms after a Gow-Gates injection, including inner ear pressure, difficulty equalizing ear pressure, decreased hearing, pain, and severe headache. The symptoms persisted for about ten days before resolving completely without further treatment. The suspected cause was either a hematoma, trauma from the needle, an anatomical variation, or some combination of these factors.¹⁸ Both complications reflect the proximity of the injection site to structures that are not present around the conventional IANB injection site, including the maxillary artery and the structures of the middle ear. These are isolated case reports rather than common events, but they underline why correct technique and aspiration before injecting are important.

The Learning Curve Problem

Despite its advantages, the Gow-Gates technique has never become the default mandibular block in most dental practices. The main barrier is familiarity. The conventional IANB is taught as the primary technique in nearly all dental schools, and most clinicians become comfortable with it through thousands of repetitions during training and practice. Switching to a technique with different landmarks, a different needle trajectory, and a different feel requires deliberate effort.

The learning curve is real but surmountable. A systematic review noted that both the Gow-Gates and conventional techniques can be mastered through training.¹⁹ The initial success rates a clinician achieves with the technique tend to be lower than what they see with the conventional block, simply because they are less practiced. The large study reporting a 1.6% aspiration rate specifically noted that these results came from operators skilled in the technique, implying that less experienced operators may not replicate them immediately.²⁰ Many practitioners who ultimately swear by the technique describe a period of frustration early on, followed by increasing reliability as they refine their feel for the landmarks and needle angulation.

How It Compares to the Vazirani-Akinosi Technique

The other major alternative mandibular block is the Vazirani-Akinosi technique, sometimes called the closed-mouth mandibular block. It is performed with the patient’s jaw closed, making it particularly useful for patients with limited mouth opening due to trismus, infection, or jaw problems. This contrasts directly with the Gow-Gates technique, which requires a wide-open mouth.

Head-to-head comparisons between the two alternatives show variable results depending on the study. One trial found the Vazirani-Akinosi technique had the highest anesthetic success at about 96%, significantly better than the Gow-Gates technique.²¹ But another trial in patients with irreversible pulpitis found the opposite pattern: Gow-Gates achieved 52% success versus 41% for Vazirani-Akinosi, and only the Gow-Gates result was statistically better than the conventional block.²² In yet another study focused on symptomatic irreversible pulpitis, the Gow-Gates approach outperformed Vazirani-Akinosi (35% versus 16% success among patients with lip numbness), though neither was considered adequate on its own.²³

The practical upshot is that the three techniques are complementary tools rather than strict competitors. The conventional block is fastest and most familiar. The Gow-Gates block covers the widest nerve territory and has the lowest aspiration risk, making it ideal for cases of IANB failure or when the long buccal nerve also needs to be blocked. The Vazirani-Akinosi block is the rescue option for patients who cannot open their mouths wide enough for either of the other two.

Modifications and Modern Adaptations

Researchers have continued to tinker with the Gow-Gates approach to address its main drawbacks, particularly the slower onset time. One recent modification, tested in a randomized controlled trial, adjusted the injection landmarks and needle path while retaining the general principle of targeting the nerve trunk high on the ramus. The modified technique showed a significantly lower need for additional injections (about 19% versus 74% in the conventional group) and a lower positive aspiration rate, though the onset time was somewhat longer than the control.²⁴ The dramatically lower need for supplemental injections in that trial is noteworthy, since having to give a second injection is both a time cost for the clinician and a comfort issue for the patient.

Ultrasound-guided approaches have also been explored in the broader field of oral nerve blocks, though widespread adoption for intraoral mandibular techniques remains limited. The general trajectory of innovation around the Gow-Gates technique has been less about reinventing it and more about refining the landmarks, the volumes used, and the clinical situations where it is most sensibly deployed.

Use in Children

The Gow-Gates technique has been evaluated in pediatric patients, though the evidence base is thinner than for adults. The anatomical landmarks used in the technique are present in children, but the proportions are different: the condylar neck sits in a relatively different position, and the ramus of the mandible is shorter. These factors require the clinician to adjust the angle and depth of needle insertion. Early clinical evaluations suggested the technique was feasible in children, but most pediatric dentists still default to the conventional IANB, partly because they are more comfortable with it and partly because the longer onset time of the Gow-Gates block is harder to manage with young, anxious patients who may not sit still.

For pediatric patients who consistently fail to get numb with conventional techniques, the Gow-Gates block remains a useful option. The wide-open-mouth requirement is the main practical challenge, since some children find it uncomfortable to hold their jaw open to the degree needed for proper needle placement.

What Patients Should Know

If you are a patient and your dentist mentions using a Gow-Gates block, you can expect a few things that differ from the more common injection. You will be asked to open your mouth as wide as possible, and the injection will feel higher and further back than usual. The area of numbness will likely be broader: in addition to the lower teeth, jaw, and chin on the treated side, you may notice numbness of the cheek and tongue without needing any additional injections. The numbness may take a few extra minutes to set in compared to what you have experienced before, so do not be concerned if the dentist waits a bit longer before starting the procedure.

The broader area of numbness also means a longer duration of post-procedure numbness. Because more branches of the nerve are affected, your lip, tongue, and cheek on that side may remain numb for several hours. The same lip-biting and tongue-biting precautions that apply after any lower jaw block apply here, perhaps even more so given the wider territory involved. For patients who have a history of dental injections not working well, asking your dentist whether an alternative technique like the Gow-Gates block might be worth trying is a reasonable conversation to have.