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7163 Yonge St Unit 265
416 855 0302
Hermetic Endo
Dr. Farzad Salehipour
About Us
Our Office provides top-notch patient care

First and foremost, we believe that people should have their own healthy teeth for an entire lifetime.


Our endodontic office is equipped with sophisticated OPMI Zeiss Microscope.


Endodontic treatments can be very challenging due to the complexity of the anatomy of the root canal system. In the past root canal treatment was performed predominantly by feel. With the aid of the OPMI, structures can be seen that remain hidden to the naked eye and treatment can be carried out with far greater precision and predictably than ever before. Microscopy in endodontics has become a way of life.


Uses of the OPMI in endodontics:


Identification of internal cracks


The dentist should always look for internal vertical coronal and radicular cracks and fractures when using the OPMI. These would be difficult or impossible to detect without the high magnification and illumination provided by the OPMI.


Canal location


The root canal anatomy of teeth can be very variable and missed canals are a major cause of failure of root canal treatment. The OPMI plays a vital role in helping to identify accessory canals at whatever level they may be. Commonly missed canals are the MB2 canal in maxillary molars and to a lesser degree, the mid-mesial canal in mandibular molars, buccal canals of lower incisors and second and third canals in premolars.


Endodontic root-end surgery


Thanks to the improved visualization provided by the OPMI along with microsurgical instruments, this procedure can be performed much more conservatively. For instance, the amount of apical bone removal/osteotomy size does not need to be large when using the OPMI. Hence, the procedure could be considered as minimally invasive. • The smaller apical osteotomy / access improves hard-tissue healing and success rates. • The OPMI enables the dentist to locate isthmuses (often infected) joining adjacent canals (ie isthmus between MB1 and MB2 in maxillary molars or MB and ML canals in lower molars) • The OPMI enables the identification of fractured instruments at the root apex.•  Using an OPMI enables the dentist to diagnose/locate root-end microfractures. •   Root-end canal preparation can be done more precisely and conservatively with use of micro-ultrasonic tips made specifically for surgery. For this, one should use high magnification and high illumination. •  Flaps are improved with the ability to make incisions more precisely with micro-scalpels. •  Suturing under the OPMI should be more precise and less traumatic. This is made possible since very fine sutures (i.e. 6-0) could be better visualized under the OPMI. This is especially important in the aesthetic area.


The benefits of the OPMI extend far beyond the obvious and well-proven clinical benefits.


Many of the procedures highlighted could not be performed without the OPMI and therefore it enables the clinician to offer many more treatments than would otherwise be possible.


Having more control of the clinical environment can lead to greater efficiency (i.e. reduced time looking for sclerosed canals), less stress and more predictable outcomes.


Patients rapidly come to understand that a dentist using the OPMI is working at the very highest standards of the profession and with the ability to document, this greatly increases acceptance of treatments.


The use of the image capturing capabilities of the OPMI provides a powerful communication tool. Whether it is with still or video images, showing patients the state of their oral health makes it easier for them to understand the problem at hand. It is easier for patients to agree to treatment when, for instance, they are shown a closeup of a faulty restoration margin and are recommended to have it replaced. Acceptance of treatment would be reduced if it were only discussed verbally. The OPMI can therefore help  to increase acceptance rates and  treatment fees.


 A picture is worth a thousand words and this is very significant when it comes to record keeping. For instance, not only is it easy to diagnose hairline fractures, but it is also easy to record them in the patient’s chart. 



Our office is equipped with nitrous oxide and our doctors and staff are highly trained in the safe administration and management of nitrous oxide. Please feel free to discuss this option further with the doctor.


Nitrous oxide, commonly called "laughing gas”  is a colorless gas with a pleasant taste and odor. People first inhale 100% oxygen through a soft nosepiece or mask. Then, nitrous oxide is slowly mixed in with the oxygen. Nitrous oxide usually starts to work in less than five minutes. Your dentist will adjust the mixture of nitrous oxide and oxygen to a level to ensure your comfort.


When used for mild (conscious) sedation, nitrous oxide may make you feel:


Relaxed, Warm, Pleasant, Happy or silly


You also may feel:


  • Tingling in your hands and feet
  • Numbness in your mouth, feet or hands
  • Heaviness or lightness


Changes in the way you hear sounds (everything sounds far away or muffled or you may hear a sound described as "white noise")


  • Sleepiness
  • A sense that everything is wonderful
  • Nausea
  • In rare cases, anxiety


Nitrous oxide does not put you to sleep. You can still respond to your dentist's requests and answer questions. Your speech may be slightly slurred, and your responses may be slower than usual. In general, you will be relaxed and cooperative. You will know when you are receiving an injection, and you may even feel it. But you probably won't care. Your breathing and heartbeat will still be normal.


Nitrous oxide is very safe when used by a properly trained dentist. Ask your dentist about his or her training with nitrous oxide. Side effects may include headache, nausea or vomiting. While you are receiving nitrous oxide, tell your dentist right away about any discomfort or anxiety you feel or concerns you have. You should never be left alone in the dental treatment room when you are receiving nitrous oxide.


If you have side effects, your dentist will turn off the nitrous oxide and allow you to breathe oxygen for up to five minutes. This flushes the nitrous oxide out of your blood.


You should feel normal and alert after breathing the oxygen. However, your motor skills and attention can be affected for as long as 15 minutes after you stop breathing the nitrous oxide. If you leave the dental office sooner than that, ask your dentist if it is okay for you to drive.


People with stuffy noses or breathing problems cannot receive nitrous oxide for dental procedures. The gas enters your lungs through your nasal passages, so these must be clear for the gas to work. Nitrous oxide also is not recommended for people with certain lung conditions. These include emphysema, bronchitis and severe chronic obstructive pulmonary disease (COPD).


Any use of nitrous oxide or other drugs during pregnancy should occur only after your dentist talks with your obstetrician.


If you take medicine for psychiatric conditions, talk to your physician before receiving any sedatives. If you are a recovering alcoholic or substance abuser, speak with your psychiatrist or drug counselor before you schedule treatment with nitrous oxide. The euphoric feeling that nitrous oxide gives may be harmful to your recovery.


Your dentist may want to talk to your medical doctor before giving you nitrous oxide if you have certain conditions. This includes:


  • Chronic obstructive pulmonary disease
  • Congestive heart failure
  • Sickle cell disease
  • Ear infection (acute otitis media)
  • Recent head injury
  • Recent surgery to repair an eardrum
  • Recent eye surgery


Nitrous oxide is safe for children, but not all children will be able to receive it. Children must be able to put up with having the soft nose piece or mask placed over the nose. They also must be able to breathe through the nose, and follow instructions from the dentist.


Tell your dentist about all the medicines you take. This should include over-the-counter vitamins and herbal supplements. Also, let your dentist know if you have had a sensitive or allergic reaction to any medicine