made in France Medical Device - Classe I
IAN Block made Easy


Injecting anesthetic in the standard inferior alveolar nerve block is a classical practice for dentists. But in numerous cases, the lack of clear anatomical landmarks makes the injection uneasy.

Dentalgic has developped and patented EZ-Block®, an syringe positioner which relies on extra-oral landmarks, easy to identify. It is a Class I medical device that allows the needle to be positioned in the theoretically ideal place to realize an IANB anesthesia with a success of about 100 %.


Benefits for you:

  • Reproductibility of injections: the needle is ideally positionned, whatever the morphology of your patient;
  • Control of height, deepth and axis of the injection to enhance efficiency and security;
  • Optimal protection: your fingers remain at distance from the injection point, which reduces the risk of accidental stings and blood exposure.

Benefits for your patients:

  • Reduction of the injected dose: your patient receives a reduced quantity of anesthesic product;
  • Reduction of injection stress: the length of the needle is hidden from your patient.

Avantages: security, patient’s comfort, time savings, simplicity

EZ-Block® is easy to use

The syringe is introduced into the tube...
"The syringe is introduced into the tube...
...until the needle reaches the exit orifice.
...until the needle reaches the exit orifice.
The dentist locates the ear lobe and the posterior edge of the mandibular ramus.
The dentist locates the ear lobe and the posterior edge of the mandibular ramus.
The tube and the positioned syringe are introduced into the oral cavity.
The tube and the positioned syringe are introduced into the oral cavity.
The retro-mandibular end is applied against the posterior edge of the mandibular ramus.
The retro-mandibular end is applied against the posterior edge of the mandibular ramus.
The tube is applied agains the occlusal suface of the maxillary premolars.
The tube is applied agains the occlusal suface of the maxillary premolars.
The stitch of the needle is done in one step, until contact with bone or with stop. The anesthetic is slowly injected after performing aspiration.
The stitch of the needle is done in one step, until contact with bone or with stop. The anesthetic is slowly injected after performing aspiration.
Attention : for some patients, the penetration point may look upper than usual (for free hands anesthesia), but the injection point of EZ-Block® is calculated. It will be optimal.
Attention : for some patients, the penetration point may look upper than usual (for free hands anesthesia), but the injection point of EZ-Block® is calculated. It will be optimal.

Video: how to use EZ-Block?

(French with English subtitles)



Preparation of EZ-Block®

User's manual

Guide de démarrage rapide

Medical Publications

BioMedical Journal of Scientific and Technical Research Journal of Odonto Stomatology Clinical trials

Questions and Answers

I am considering using EZ-Block®

Is EZ-Block® easy to use?
Yes, EZ-Block® is very easy to use: after 4 or 5 injections, you will know how to position it in few seconds.
Basically, there are two landmarks to identify, well explained in the User guide which is inclued in the box :
  • a hollow which appears when the patient opens the mouth, in front of the earlobe
  • the maxillary premolars
These landmarks are very important, but easy to identify.
Does EZ-Block® really give 100% success rate?
Honnestly... yes...
Well, maybe it's only 98% or 99%. But it was used on thousands of patients by hundreds of practitionners, and no failure was reported.
The success rate (100%) is clearly far higher than the free-hand success rate (70%).
Does EZ-Block® reduce risks?
Yes, EZ-Block® reduces risks!
Using EZ-Block® does not increase any risk for the patient: the device enables to position the syringe towards the right injection point. But the injetion remains similar to a free-hand injection.
Moreover, one unique cartridge of anesthesics is enough (vs. 2, 3, 4, or more, with free-hand technique).

But EZ-Block® reduces the risks for you:
  • no risk of failure
  • no risk of injury with the needle: you don't need to palpate the penetration point, so your fingers remain far from the needle.
Does EZ-Block® reduce the anesthesia delay?
Yes, it does: with EZ-Block®, the anesthesia is effecive within 2 minutes, and sometimes less!
Do you propose specific training sessions?
We do not propose training sessions, because such sessions are not necesary: they would last 10 minutes...
The practitionners who test EZ-Block® during tradeshows learn how to use it in seconds!
There are many videos on this web site, and the user guide which is included in the box will answer to all your queestions.

Of course, we can be reached by phone (+33 9 83 36 25 47) or by email (contact at
What is patients' feedback?
The patients consider EZ-Block® as an additional tool, and a sign of professionalism.
Moreover, EZ-Block® hides the length of the needle, and this limits the patients' stress.

I am using EZ-Block®

Do you advise to use adrenalin at 1/100 000 or 1/200 000?
We reommend to use adrenalin at 1/200 000.
Which needle should I use?
It is necessary to use 35 mm needles: everything is calculated with precision...
It is recommended to use 25 G.
The needles sold on our shop are perfectly adapted.
The penetration point of the needle sometimes looks higher and deeper compared with free-hand technique. Is it normal?
Yes, it is on purpose: you can inject with confidence.
Free-hand anesthesia uses oral landmarks (the mucous triangle) to determine the penetration point of the needle.
EZ-Block® uses extra-oral landmarks to determine the injection point of anesthetic.
Consequently, it is possible that the penetration point seems unusual, but the injection will in reality be more efficient..
LThe penetration point of the needle seems too high and to deep.
What is the best injection point? (short answer)
The best injection point is located on top and rear of the mandibular foramen, because the anesthetic liquid will spread downwards and to the front.
  • too low, or too much to the front: the anesthesia may fail
  • too high, or to deep: the anesthesia may reach the parotid gland and cause a temporary facial paralysis.
With freehand technique, the practitionner does not dare to inject too high. So he sometimes injects too low...
EZ-Block® controls the injection point to have it at the right place.
What is the best injection / penetration point? (long answer)
With freehand technique, the penetration point must be located in the middle of the mucous triangle, limited by:
  • the pterygomandibular raphe
  • the anterior border of the mandibular branch
  • the inferior border of the lateral pterygoid
Also, the syringe body must be oriented at the level of the teeth according to the axis of the mandibular branch (this is the variable aspect of freehand injections ...)
However, it is not always easy to assess the orientation of the axes of the mandibular branch, and it often happens that bone contact is obtained too early (then the syringe body is then straightened to push the needle deeper) or on the contrary no bone contact at all (and the practitionner wonders where to inject ...)

With EZ-Block®, the point is different : computed tomography studies performed to design EZ-Block® enabled to fix the orientation of the syringe body at the premolars regardless of the orientation of the patient's mandibular branches.
This implies that, for mandibular foramen analgesia with EZ-Block®:
  • the point of needle penetration varies from one patient to another (it is not always located in the middle of the mucous triangle and is quite often close to the raphe)
  • the injection site is always located 15mm in front of the posterior edge of the mandibular branch (therefore always behind the mandibular foramen)
  • the injection site is, depending on the orientation of the mandibular branch:
    • is located at bone contact,
    • is located 2 or 3mm from contact with the medial face of the mandibular branch (but always 15mm in front of the posterior edge of the branch)
The position of the injection site with EZ-Block® is therefore compatible with the success of anesthesia regardless of variations in the axis of your patient's anatomy.
How many anesthesic cartridges should I use?
Generally, one cartridge is enough.
In case of pulpitis, a second cartridge is recommended, but thanks to EZ-Block®, it will be injected at the same (and right) spot.

I don't need EZ-Block®

I always perform freehand anesthesia
Congratulations! You are one member of a (very) restricted club.
I purchased an electronic device to perform ostocentral anesthesia
You should not have done this, but it's too late...
With EZ-Block®, you don't need any specific training. You don't have to bear maintenance fees, you don't have risks to break the needle in the patient's bone...
With EZ-Block®, your patiens would not have the stress to feel vibrations in their jaw...

Save time and money, thanks to EZ-Block®

Have you ever calculated the time you spend waiting for the anesthesia to be effective?
Thanks to EZ-Block®, mandibular anesthesia can block the nerve in 90 seconds!
The following calculator will enable you to estimate the time and money that you can save thanks to EZ-Block®.

Activity in your practice
Anesthesia habits
5 min
A mandibular anesthesia is rarely effective in less than 3 minutes

Missed revenues
Nicolas Caillieux

About EZ-Block®

DENTALGIC is a company created by Dr. Nicolas Caillieux, dental surgeon, who invented and patented the concept of EZ-Block®. Through his experience in Hospitals and Universities, he gathered anatomical inputs to create these new products.

EZ-Block® has been developed and patented between 2005 and 2014.


  • 2015 : Caillieux N, Rousset P, Vidaud C, Robert C, Arreto C-D, Mahler P, Tager F, Tilotta F. Utilisation d'un angulateur pour analgésie au foramen mandibulaire. Etude préliminaire comparative avec une technique "à main levée". Rev Odont Stomat. 2016; 45 : 106-117.
  • 2012 : Laujac MH, Caillieux N. Les techniques analgésiques et leurs indications dans la région molaire mandibulaire. Information Dentaire. 2012 ; 41 : 28-2.
  • 2008 : Robert C, Caillieux N, Wilson CS, Gaudy JF, Arreto CD. World orofacial pain research production : a bibliometric study (2004-2005). J Orofac Pain. 2008 ; 22(3) : 181-9.

Accademic background

  • 2006-2020: Manager in the Société d'Anatomie et de Pathologie Orale S.A.P.O. (Anatomy andOral Pathology Society).
  • 2004-2009: Accademic assistante in the Anatomy and Physiology Deparments (Paris V).

Clinical duties

  • 2014-2020: Dental surgeon in the Stomatology Department of private hospital Ursulines in Troyes (France).
  • 2006-2009: Dental surgeon in the Stomatology Department of the Troyes hospital (France).
  • 2004-2009: Assistant in the Oral Surgery Department of the Albert Chenevier hospital (Créteil, France).

Users feedback

I tested the product for chirurgy on patients with a wide variety of ages and for pulpits, and clearly, every time the anesthesia works at an incredible speed.
Dr Adrien B.
Today, (after reading your recommendations), the IANB is effective within less than 1 minute, and even 30 seconds are enough.
No more gingival wounds on the papillae (intraseptal), no more pain for the patient.
True working comfort for the practitioner and for the patient.
Kudos to you for this revolutionary tool.

Please note that all the practitioners at the dental center have asked me for a demo. Those who do not practice IANB are amazed by the efficiency and those who already do are surprised at the speed with which the anesthesia takes and especially the success rate.
I myself am in a hurry to be able to order a box because I will not be able to do without it anymore.
I wish you great success.
I believe in it and talk about it as if I had invented it myself.
Dr. Olivier S.
Hello Nicolas,
I am very satisfied with the system for making the tronculars. I made about 10 injections and all of them worked within 3 minutes and the last within 5 minutes.
Dr. Patrick S.
I did not see any difference in terms of handling compared to the prototype: systematically I palpate the anatomical landmarks and I show the kinetics empty to familiarize my patient.
Then I perform spix anesthesia (1 cartridge of 1/200 000) which I systematically complete with a periapical disto-vestibular of the 7 (read in the jpio "endodontics").
It is very rare for me to perform a second injection. If ever a small sensitivity persists, I treat it with an intra ligament point.
I noticed that the friction of the plastic syringe in the syringe positioner was softer than that of the metal with the prototype. By putting the head in extension with a rotation of the side to be anesthetized, I only have to accompany the syringe body until the stop. It seems more comfortable to the patient.
I do not perform suction before injection but when disassembling the piston, I actually see a nice suction effect which suggests that the absence of harpoon does not prevent suction for practitioners who want it.
In conclusion, I find the finished product in line with the prototype with as much success on arrival. The risks associated with this type of anesthesia are not increased in my opinion (paraesthesia) with this technique, but the results are much more predictable once the gesture is acquired.
The learning curve is generally rapid: ten anesthesias will be enough to use the syringe positioner without apprehension.
I wish you all the success you deserve with this project which is reaching its goal and I thank you for allowing me to participate in the adventure.
Dr. David D.
The tests are going well, I have a little more difficulty using it on the right side.
I have 2 really impressive cases of patients resistant to anesthesia even osteocentree that I managed to anesthetize in less a minute !!
They couldn't believe it (and neither did I)
Dr. Adrien B.
I took a little time to start because the size of the system scared me a little. To tell you everything I have already done two and I had very good results and as soon as it occurs I will continue to use it.
Dr. Jérôme C.
Not being a fan of IANB because I almost always missed them, I had stopped practicing them.
I became a fan of the Ez-Block,
  • Very easy to use,
  • Reproducibility, not a single failure
  • I work more in sector
  • No more stress on the bottom 7 pulpites .....
  • Another advantage is that the patient does not see the needle, which can easily be hidden in the cylinder.
Last week, pulpitis in a 93 year old lady, two cartridges as you advised me, in 9 min deep anesthesia and clinical silence.
Nothing else to add, I am a big fan.
Dr. Aziz I.
During my studies at the university, 3 years ago, I only practiced few times the IANB anaestesia, and without much success. Today, when I have to practice a deep treatment, or to work on a mandibular molar, I automatically do a loco-regional anaestesia, but moreover, I use the device imagined by Dentalgic. This tool requires some training at start, but it really helped me to demystify this anaesthesia. I continue to use it (with 35 mm needles) but I don't practice aspiration test.
The Quicksleeper tool was also tempting but many times but at such price... ouch ouch... For this reason, I will never thank enough Nicolas Caillieux.
Dr. David D.
I am happy to hear about you again, Docteur Caillieux, to tell you that I am very satisfied with your product, and that I use it nearly every day.
I will sadly not be n Köln [IDS 2019], but we will stay in contact in the future.
Best regards.
Dr. Enrico T.
Dear friend,
I am satisfiee with the use of my device to position syringes.
I don't use it every day, but pretty often.
Possibly you can think about an extension for biggger people!!!
Best regards
Dr Catherine A.
I use "EZ-Block®" for every spix, I am satisfied with the product, my success rate is higher.
I first inject some anesthedic product with an syringe in para-apical mode, and then I do a spix with the "EZ-Block®" system.
Dr Olivier G.
Easy, comfortable, I use your product for all injections in the standard inferior alveolar nerve block.
Dr Jérôme B.
I reply to your letter.
I am very satisfied with your product. I don't use it very frequently because I don't do a lot of injections in the standard inferior alveolar nerve block, but I must admit the success rate is 100%.
I would need a short YouTube video to rememeber how to use it. Possibly I did not see it...
Dr Benjamin C.
Good evening Dr CAILLIEUX,
I answer to your letter regarding my purchase of your guiding device.
I smiled when I received your letter, because I thought about calling you just after the purchase.
Indeed, I have been overwhelmed by the efficiency of this device, which enables me to deal with pulpites with serenity. The device is well engineered, easy to use, and very efficient.
I am really happy with it, and I use it systematically for all avulsions and canal obturation on the mandibular molars and premolars, as well as for multiple care.
This device deserves to be popular!
Thank you very much!
Dr Jean-Philippe B.
I thank you for your letter, and I will share with you my experience about your guiding device.
To make it short, this fantastic tool changed my professional life!
I must admit I was really not very good at Spix. Over 75% of miss rate after first injection! I tried again and again to take anatomy courses, to read again and again my practical bood about dental anesthesia, nothing could help! Whatever the method I used to get references, I constantly cought the mouth nerve, or the toungue nerve, or even (yes, believe me!) the face nerve, but never this f*** mandibular neve. Extracting a mandibular tooth was always a nightmare, with some attempts to use infitrations through ligaments, but it constantly ended up in dry alveolite.
And then I discovered your tool, whilst moving around the booths during the ADF trade show (in 2011 if I remember well).
When I was expalined how to use it, it was like seing the light at the end of the tunnel.
Back at my office, I did not wait, and I tested it on the fist mandibular spine of the day, and in less than one minute, half of the lower jaw of my patient was alseep. You can not imagine the relief of all fears related to mandible acts, the sense of liberation that gave me the use of super-gadget. It's a pity you have not won the Innovation Award in the ADF because this tool is truly life-changing, and greatly facilitates the practice. No need to ask ideological and metaphysical questions, take a Xanax before (!), to use a voodoo sorcerer (!!!), to twist the wrist to find the thing ligament, the concavity branch etc ... I can practice almost blindly thanks to this tool.
The few times I have failed are related to the fact that I have not positioned the ball at the earlobe. I advised my best friend and colleague who also encountered some difficulties in placing this anesthesia.
Sorry for all that spiel, but I wanted to share my personal story with infiltration in the mandibular nerve, so that you understand all the good things of the guidance system, which I systematically use when I have such anesthesia to practice.
And needless to say, I would recommend it to 100% of practitioners who have difficulties with mandible anesthesia, and who would ask questions about its reliability. It is extremely reliable.
From a practical point of view, there is an additional security, because the size of the guiding sheath requires the patient to keep the mouth open, and tongue naturally remains aloof.
Thank you so much for having developed this tool, I would say it gives to mandibular anesthesia the same advantages as WAMkey for loosening crowns.
Dr Anh A.

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