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  • Writer's pictureRahul Monga

Mastering Endodontic Access Preparation: A Guide For NDECC, ADC Practical Examinations

Updated: May 12


In the realm of endodontic simulations , achieving mastery in creating precise and effective access cavities is a fundamental skill for dental professionals gearing up for Australian Dental Council & National Dental Examination Board Of Canada (NDEB) exams. This detailed guide aims to provide an in-depth exploration of endodontic access cavities for exam simulations. By scrutinizing two distinct cases, each employing different techniques, we'll unravel the intricacies and variations that render both approaches not only acceptable but optimal in specific scenarios.

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Continuous checking and going back and forth are paramount to ensure the pulp chamber is adequately unroofed without creating ledges.

Case 1: Conservative Approach with Two Round Carbide Bur

Angled Round Bur Technique:

Our journey begins with a more conservative approach, utilizing a two-round carbide bur for the initial punch cut. The chosen starting point, marked as the green "X," is strategically positioned in the central groove area—midway between the buccal and lingual cusps, aligning precisely with the triangular ridges of the mesiobuccal and mesial lingual.

The technique involves angling the round bur towards the mesial, tracing the natural distal wall of the pulp chamber. This method takes advantage of the rapid effectiveness of the bur, stressing the thinness of the enamel on the dentin, requiring a delicate touch to prevent over-reduction.

LA Axxess Diamond Burr and Continuous Verification:

Transitioning to the LA Axxess Diamond bur, designed by Dr. Steven Buchanan, this segment focuses on its safe tip and its role in the unroofing procedure. Continuous checking and going back and forth are paramount to ensure the pulp chamber is adequately unroofed without creating ledges.

The peculiar wax-like pulp tissue of plastic teeth poses a unique challenge, demanding meticulous removal from the pulp chamber. The endo explorer becomes a critical tool in detecting any ledges or remnants of the roof that may need further attention.

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LA Axxes Bur

Refinement with Endo Zebra and Final Evaluation:

Moving forward, the refinement of the access cavity involves the use of an Endo Zebra bur to smooth the outline form. This bur's safe tip ensures a cautious approach, minimizing the risk of perforating into the furcation area. Maintaining straight-line access to the canals remains a crucial aspect of the procedure.

An intriguing addition to the discussion is the potential use of an orange solvent to aid in removing wax material from the pulp chamber. While this technique is suggested, its efficacy remains untested, leaving room for experimentation and potential advancements in endodontic practices. Another point of concern, this solvent may not be allowed for your examination purposes.

Final Considerations:

As the access cavity takes shape, an endo explorer is utilized to demonstrate how a well-executed access allows for a smooth entry into the canals without encountering ledges. The nuances of canal anatomy, especially the oval-shaped distal canal, are explored, showcasing the uniqueness of plastic teeth.

The final assessment of the access cavity involves its size, shape, and adherence to the principles set by the set path. The larger-than-usual size of the access, attributing it to the nature of simulation teeth, which typically demand a fairly large access.

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The creation of a smaller access cavity showcases the versatility of this bur, particularly for those cautious about using a round bur.

Case 2: Innovative 330 Diamond Bur Technique

Advantages of 330 Diamond Bur:

In the second case, an innovative approach is introduced, leveraging a 330 diamond bur for creating the access cavity. Praised for its smooth penetration of plastic teeth without chattering, this technique provides practitioners with enhanced control over the procedure. The creation of a smaller access cavity showcases the versatility of this bur, particularly for those cautious about using a round bur.

The advantages of this technique are underscored, emphasizing its potential benefits for practitioners concerned about over-reduction. The controlled nature of the 330 diamond bur allows for a more precise and measured approach, addressing the anxieties of practitioners who may be hesitant to initiate access with a round bur.

Unveiling the Distinct Anatomy:

Navigating through the tooth with the 330 diamond bur, this segment unveils the distinct anatomy of plastic teeth. Emphasizing the need for flexibility in approach, each tooth may present unique features that require adaptation of the chosen technique.

Balancing Precision and Flexibility:

The 330 diamond bur is then employed to initiate the unroofing process, showcasing its controlled removal of dentin. The emphasis on continuous adaptation and refinement is reiterated, emphasizing the need for practitioners to be responsive to the tooth's unique characteristics.

We have to acknowledge the variability in pulp chamber anatomy, so discussion delves into the importance of adapting techniques to the individual tooth. This acknowledgment reflects a departure from a one-size-fits-all approach, encouraging practitioners to tailor their methods to the intricacies of each different tooth in arches.

Adapting to Variability:

As we progresses to the removal of pulp tissue and refinement of the outline form, the adaptability of the 330 diamond bur technique becomes more apparent. The controlled nature of this bur allows for precise adjustments, ensuring optimal access while mitigating the risk of over-reduction.


Mastering endodontic access cavities for exam simulations demands a multifaceted understanding of various techniques and their application in diverse clinical scenarios. Both the conservative two-round carbide bur approach and the innovative 330 diamond bur technique offer unique advantages, catering to practitioners with different comfort levels and preferences.

The journey from initial access to final refinement is a nuanced process that requires a blend of patience, precision, and adaptability. Practitioners are urged to embrace variability in tooth anatomy and remain responsive to the unique challenges presented by each case. This comprehensive guide serves as a valuable resource for dental professionals seeking to elevate their endodontic skills and excel in exam simulations like NDECC (NDEB) and ADC Practical (Australian Dental Council). As we continue to explore the intricate world of endodontic procedures, the principles and techniques presented here will undoubtedly contribute to the success and mastery of this essential aspect of dental practice.


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