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Root canal re-treatment.
Root canal treatment doesn't always success. Sometimes, it fails because the root canal system is too complicated. Sometimes, it fails...

Dr Changjie Guo
Mar 24, 2023


Teeth grinding
Teeth clenching and grinding (also called bruxism), can cause excessive wear and damage to your teeth, potentially resulting in cracks,...

Dr Changjie Guo
Nov 14, 2022


Apicoectomy - root canal surgery.
Like all dental procedures, root canal treatment may fail and the tooth becomes infected again. In most cases, root canal re-treatment ...

Dr Changjie Guo
Dec 5, 2021


Work hard to save the natural tooth.
Dental implants and implant-supported restorations are an excellent treatment in dentistry, and getting more and more popular. However,...

Dr Changjie Guo
Nov 28, 2021


Root canal re-treatment - fix failed root canal treatment.
Failure happens in all aspects of dentistry including root canal treatment . There are many factors can contribute to failure of root...

Dr Changjie Guo
Jun 4, 2021


A different approach to root canal treatment.
Root canal treatment is the only way to save the tooth when the nerve gets infected inside the root canal. For front teeth, root canals...

Dr Changjie Guo
Jul 4, 2020


How complicated is root canal system?
We all know root canal treatment is a lengthy and not cheap procedure, but shouldn't be a painful procedure. Root canals can be narrow...

Dr Changjie Guo
May 10, 2020


Treatment of calcified root canals.
Calcified root canals happen when calcium gets deposited in the root canals and the canal space shrinks. This can pose a challenge if a tooth needs a root canal therapy because it can be difficult to get even the smallest of tools down them. The cause for calcification may vary, prolonged infection and trauma, the natural process of ageing, fillings or crowns over a long period of time are the common reasons for it. The incidence of calcified canals is highly correlated wi

Dr Changjie Guo
Jan 5, 2020


How deep is the crack?
A cracked tooth can result from chewing on hard foods, grinding your teeth at night, injury and can even occur naturally as you age. The most common cause seen clinically is fillings so large they weaken the integrity of the tooth. Teeth can crack in several different ways: Craze lines. These are tiny cracks that affect only the outer enamel of the tooth. They are common in all adult teeth and cause no pain. Craze lines need no treatment. Fractured cusp. This kind of crack

Dr Changjie Guo
Dec 15, 2019


Internal tooth resorption - root canal treatment with 5 canals.
Tooth resorption refers specifically to the inflammation and loss of dentin (inner tissue) or cementum (outer material) to absorption. Tooth resorption is classified internally and externally, depending on where the loss of tooth occurs. External resorption is much more common than internal resorption, and often easier to see than internal resorption because it commonly occurs on the outer surface of a tooth. Internal resorption affects the inside of a tooth. This is usuall

Dr Changjie Guo
Aug 27, 2019


Do I really need a crown after a root canal?
Crowns are one of the more common restorations that people need on their teeth. But it is a completely fair to ask “Do I really need a crown?” because even with insurance, crowns may cost you hundreds of dollars at a time. The reason they are recommended frequently is that a dental crown is often the best option to extend the life of a tooth for years to come, especially after root canal therapy , when lots of tooth structures have been removed. For many root canal procedur

Dr Changjie Guo
Mar 28, 2019


RCT - No crown - Tooth split - Extraction.
Sometimes teeth need root canal treatment because of deep decay, crack or chip in the tooth, and trauma etc. In most cases, the dentist will suggest to put a crown after root canal treatment. But what if I just leave the tooth without a crown? This is what may happen to a root canal treated tooth without a crown - It splits and needs extraction . From the x-ray, we can see lots of tooth structure had been removed because of root canal treatment . The tooth was weak and th

Dr Changjie Guo
Oct 16, 2018


Save the tooth!
What happens when only tooth root stump left? Is extraction the only option? This case will show you what can be done to save the tooth. To save the tooth, the procedures performed included root canal treatment , surgical crown lengthening , post and core buildup and a zirconia crown . That's lots of effort! But it's worthy! #Surgicalcrownlengthening #RootCanalTreatment #veneerscrownsandbridges

Dr Changjie Guo
Jul 7, 2018


External Root Resorption.
Root resorption is not a common dental condition but it can lead to tooth extraction. There are two main types of resorption that may happen to a tooth: internal and external. The causes of external resorption can be trauma, rapid orthodontic movement and infection etc. The troublesome tooth in this x-ray caused toothache and pus oozing out of gums. On the x-ray, the tooth showed dark area on the root but the margins of the nerve was quite clear. Thus we highly suspected e

Dr Changjie Guo
May 25, 2018


Challenge of root canal treatment
Root canal anatomy variations present a constant challenge in successful diagnosis and endodontic treatment , especially the multirooted teeth. The most challenging root for endodontic treatment at the level of location, shaping, avoidance of iatrogenic events, and obturation is the fourth (MB2) canal of the upper first molars. Maxillary first molar is the most commonly treated tooth yet with the highest endodontic failure rate because of undetected canals, especially the mes

Dr Changjie Guo
Apr 20, 2018


Don't give it a crack!
Tooth enamel is the hardest part of the body but it still can crack, chip and break. When it has a small crack, it may cause crack tooth syndrome which involves sharp pain when biting on it. When the crack travels deeper and touches the nerve inside the tooth, it will cause severe toothache, often it's too painful to sleep and ends up with dental emergency . In this case, the crack on the distal was too deep for the nerve to survive and a root canal treatment was unavoidabl

Dr Changjie Guo
Dec 23, 2017


Healing of dental abscess and success of root canal treatment.
Acute dental nerve infection could be one of the most painful experience a dental patient has ever had. It can cause very severe pain, even strong pain killer doesn't help too much. It's also one of the most common reasons of dental emergencies . When it becomes chronic, dental abscess can be formed. Infection of dental nerve is normally caused by dental caries (decay), deep cracks, gum disease or trauma. The treatment option is either root canal treatment or extraction .

Dr Changjie Guo
Oct 15, 2017


As rare as a hen's tooth!
As a dentist, I see abnormal tooth structure or anatomy sometimes. Most of them are not often to be seen and very few are rare cases. But this one is extremely rare, like a hen's tooth. From the first picture, we can see the tooth had two dental abscesses. Obviously the tooth's nerve got infection, which can be seen on the x-ray clearly. Also we can see something abnormal on the x-ray - the tooth got an extra root! After successfully completing the root canal treatment , we

Dr Changjie Guo
Jun 4, 2017


I'LL BE BACK! - Do Not Ignore Tooth Decay.
This patient came in for an emergency dental treatment with a very bad toothache. He couldn't sleep much because of the severe pain. On our records, we found one of his top left teeth got a decay 18 months ago but he didn't come back to have the filling done. Unfortunately today's x-ray showed the decay had progressed and touched the nerve. The only way to save the tooth was root canal treatment . Pulp extirpation (removal of the nerve) was performed as an endodontic emergen

Dr Changjie Guo
May 20, 2017


Root Canal Re-treatment
The patient came to our practice complaining of abscess on and off around one of her back teeth. She had root canal treatment and crown done two years ago. On the x-ray, we can see a defective root canal treatment with underfilled root filling and periapical infection. The tooth was also loose after the bridge was cut off because of bone loss caused by persist infection. After discussing the options with the patient, we decided to re-do the root canal treatment , which in

Dr Changjie Guo
Apr 23, 2017
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