Calcfied Canal Management Case Study

CALCFIED CANAL MANAGEMENT        

INTRODUCTION

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With an increasingly aging population, and one which is remaining dentate, the endodontic implications of sclerosis is one which we are perhaps more exposed to now, more than ever. Sclerosis of the pulp is a natural process and happens due to both pathological & physiological causes. Secondary and tertiary dentine are deposited over time, thus reducing the viable pulp space as we age. Secondary dentine is deposited once apexification has occurred and continues throughout our lifetime. Tertiary dentine (reactionary/reparative dentine) is deposited in response to trauma to the pulp, this can be in the form of caries, bruxism, fractures, physical trauma or even tooth preparation. The process of tertiary dentine deposition is described quite eloquently by Trowbridge who describes the process as dentines response to shield the ‘King Pulp’ during invasion attempts by bacteria.¹

Fortunately advances in knowledge and especially endodontic armamentaria means that the management of calcified root canals can be more predictable, thus allowing resolution & restoration of teeth that perhaps would previously have been extracted, despite potentially being functional & restoratively sound.² In an age where patients have a greater expectation regarding retaining their own teeth it’s important to be aware of how best to manage these cases.

The most common way in which calcified canals will first be identified is from the pre-op radiograph (or radiographs in the case of multi-rooted teeth). From there on the management of calcified canals follows the same basic principles that all endodontic cases do:

• Magnification
• Access
• Instrumentation
• Chemo-mechanical disinfection

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MAGNIFICATION

Studies have highlighted the importance of magnification in location of canals, Scharwze et al³ demonstrated the benefit of magnification in locating MB2s in 6s, canals which are traditionally difficult to locate. It therefore goes without saying that in teeth which show sclerosis and calcified canals that magnification, whether in the form of dental loupes (figure 3) or an operating microscope (figure 4), is of paramount importance in terms of managing these cases. These aid in providing visualisation and illumination into a small working area, and help to highlight landmarks in the pulp chamber that can aid in location and management of calcified canals

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Figures 1&2: Sclerosed canals tooth 12 & 36m canals

Figure 3: Dental loupes with light

Figure 4: Leica Dental operating microscope

ACCESS

Pre-operative radiographs assessment is essential in cases with sclerosis. For teeth with more than one canal it is therefore recommended to have more than one pre-op radiograph at different angulation. These should be studied to help gauge the depth from the crown to the pulp chamber, or in cases where the sclerosis is deep into the root, the depth to the beginning of the canal. Many digital radiograph systems will have built in software which can be used to measure these depths as a rough guideline.

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Within teeth with calcification of the pulp chamber, the aim of access is the same as in ‘normal’ endodontics – allowing unimpeded access into the pulp chamber and the root canal system with as minimal destruction to sound tooth tissue, thus allowing restoration post endodontic work. The issue with cases with severe calcification of the pulp chamber is that access is more to do with location of the canal orifices, rather than locating the pulp chamber as this is non-existent. This unfortunately generally leads to more tooth structure being removed than desired in pursuit of the canal system. This can have dramatic consequences in the form of perforations or removal of too much tooth structure thus rendering the tooth unrestorable.

Figures 5 & 6: A case referred to me after GDP perforated looking for sclerosed palatal canal. Palatal canal was found & perforation repaired with MTA, access sealed GI & composite. 2^nd radiograph is 6months post op which shows excellent healing of apical pathology.

Fortunately, there are some ways & equipment available which help us in our locations of the root canals. As stated previously, the sclerosis process is down to the deposition of secondary & tertiary dentine over the root canals, this fact allows us to use the differences in dentine types to help locate the root canals. Krasner & Rankow⁴ describe several laws which aid in location of root canals, all of which are excellent rules to use as a guide in orifice location.

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One of these rules is that the colour of the pulp chamber is always darker than the walls of tooth. Under magnification & illumination these subtle changes in dentine colour can be noted. When in the pulp chamber & troughing for canals, ensure that it is dry and it can be noted that in use a bur or ultrasonic will remove ‘whitish chips’ which end up accumulating in one specific location – this often being a canal orifice. Therefore, against the backdrop of the dark dentine of the pulp chamber floor, canal orifices can often appear as little white spots.⁵ The use of magnification is pivotal here to see the slight changes in dentine colour.

Personally, I find the use of ultrasonics and gooseneck burs (figures 6 & 7) key pieces of equipment to use in such cases. These both allow careful, selective, controlled removal of dentine. The use of an endodontic DG16 probe or Micro-orifice openers are also routinely used to aid initial penetration and exploration of these ‘white spots’.

Figures 6 & 7: Long neck gooseneck burs (Meisinger) & ultrasonic endo tips allow more controlled removal of dentine when searching for canal orifices. They can both even be introduced into the orifice to aid initial exploration.

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In multi rooted teeth use of dyes can also be beneficial in terms of locating canal orifices. An example of this is Cerkameds ‘Canal Detector’ which works by having a dye contained in the product which invades into the root canal orifices and dyes them blue thus enabling easier detection. The product can also be used in the same manner to detect cracks within teeth.

Figures 8: Cerkameds Canal Detector – contains methylene blue which can aid canal orifice detection

INSTRUMENTATION

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Once any calcified canals are identified, negotiation of them presents another challenge. As with all endodontic cases the use of both stainless steel (SS) hand files and NiTi files (rotary and/or reciprocating) are the mainstays of treatment.

The small hand files are important in creating a ‘glide path.’ This is effectively an initial preparation of the root canal structure from orifice to apex, which preceding rotary/reciprocating files are to follow.⁶

Benefits of glide path creation include:

-scouting of canal structure

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-initial introduction of irrigant

-lubricates canal before introducing bigger files

The use of pre-curved smaller hand files such as .06 & .08 is often the first step in initial exploration of calcified canals. In canals which are extremely calcified or curved, traditional SS K files can struggle to negotiate the canal system and often unwind, twist and thus run the risk of fracturing. Dentsplys (Dentsply Sirona Endodontics) C-Pilot files are often a good alternative in such cases. These files are made from a special steel alloy with a uniform structure which offers maximum resistance to fracture, but with no limitations re flexibility. The files have an inactive tip which allow the instrument to follow the canal rather than cutting its own pathway, thus decreasing the risk of perforation of the root canal system.

In all cases it is imperative to achieve a reproducible glide path before thinking of introducing any mechanically driven file.

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Mechanically Driven Glide path

To aid in glide path production there are a number of files on the market these days whose aim are to assist in initial preparation of canals by aiming to create/ enhance glide paths. These NiTi files are designed to do the job that SS hand files can do but more efficiently & safely. Traditional SS files have the disadvantage in that if not managed properly they can end up creating their own pathway within the root canal system (transportation) and thus run the risk of perforating or blocking the canal, due to lack of flexibility of the file.

With their improved metallurgy and engineering, NiTi endodontic files with small tapers & apical tips have been shown to follow natural canal curvatures better than hand SS files.^7,8

Examples of such files include: Proglider, Pathfiles & WaveOne Gold glider.

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Improved NiTi Files For Main Preparation

Newer generations of NiTi alloys such as WaveOne Gold, ProTaper Gold, Reciproc Blue are thermomechanically treated NiTi alloys. The process of manufacture allows the files to be more flexible with improved cyclic fatigue resistance and greater angle of deflection at failure when compared to conventional NiTi and therefore offer many advantages when looking to negotiate calcified canals.⁹ Certain files, due to the heat-treated process in how they are manufactured, can also be pre-bent thus giving another advantage in terms of negotiating tight canals.

CHEMO-MECHANICAL

Chemo-mechanical preparation remains arguably the most important aspect of root canal treatment in terms of trying to disinfect the root canal system. With calcified canals its especially important to never try to instrument in dry canals, to limit the chance of file separation, creating blockages etc…

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Irrigants remain the most popular way of providing lubrication within the root canals & of all the irrigants available sodium hypochlorite (NaOCl) is the most commonly used as it meets most of the requirements for an endodontic irrigant compared to every other compound.¹⁰ It has the ability to dissolve necrotic tissue and the organic components of the smear layer and it has a broad antimicrobial spectrum. 17% EDTA can also be used to aid in removal of smear layer. If used, it’s important not to mix NaOCl and EDTA.

Rather than irrigation, EDTA in the form of a lubricant gel (such as Glyde, File-eze, Canal+ etc….) can be used as an adjunct to irrigation to aid the passage of files.

OTHER COMMENTS

Time

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Time is imperative in these cases especially as you go deeper into the tooth in search of an opening. Make sure you have plenty of time for the appointment as rushing to locate canals in areas where there is minimal leeway for error, will ultimately lead to error.

Tiredness and Limitations

If you find yourself searching and searching, there is no shame in dressing the tooth and coming back to it another day. The best weapon in our armamentaria for locating root canals are our eyes, and like all muscles if used a lot are prone to fatigue. I have countless anecdotal evidence in cases where I haven’t been able to find all canals by the end of a long appointment and yet I’m able to locate them within minutes of a second appointment.

Stop and Continually Reassess

If you are going deeper and deeper into a root canal system looking for an opening, it is worthwhile stopping and re-assessing at regular intervals. It is common to become fixated on one spot within the tooth and continually work there until you’ve located the canal or perforated. I advocate stopping every so often and re-assessing with radiographs to make sure you aren’t going off-course. In these difficult cases CBCT is incredibly useful to aid location, if you have access to one.

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Limitations

Even with all the advice there will be some cases where you may have to stop mid-treatment and admit defeat. There is no shame in stopping if you’re having difficulty and then referring on to someone better equipped. It’s much better to realise your limitations and refer on before you potentially create other problems e.g. worsening a ledge, creating an apical block or perforating.

Figures 9 & 10: A case referred to me after GDP was unable to locate sclerosed canal through an existing crown. You can see in the post op how close they came to perforation.

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CASE STUDY

New patient attended practice after seeing an emergency dentist due to a veneer debonding. The veneer was replaced temporarily & patient was advised to see a dentist.

Patient was 58 years old, medical history was unremarkable but, they hadn’t seen a GDP for over 6years. Her primary concern was her debonded veneer and their overall aesthetics (which had been present for over 10years) but was aware that would likely need a lot of dental work.

She was seen by a colleague who recorded that gingival health was fair, the dentition was heavily restored with a number of leaking restorations, with all upper anterior veneers except 13 showing gross secondary decay. Periapical radiographs of teeth 11 & 21 showed severe sclerosis of the root canal system. Due to the decay present & lack of sound coronal tooth structure, the canal space of 11 & 21 were required for restoration with post crowns.

A treatment plan was devised as follows:

Stabilisation Phase: