Endodontic Micro Surgery (Apicoectomy) Treatment
Endodontic Microsurgery (Apicoectomy) Procedure Overview​
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Last week, I shared a brief blog discussing some key reasons why an apicoectomy might be recommended. This week, I’d like to continue that conversation by breaking down and simplifying what the treatment actually involves. In particular, this post will focus on the diagnostic steps and evaluation process that help determine whether apicoectomy is the right choice. I’ll keep things clear and digestible—no dense textbook language here—and as always, feel free to reach out with any questions.
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One of the most critical stages of this procedure is the planning phase. Not every tooth qualifies for this type of surgery, and not every patient is a suitable candidate. That’s why an accurate diagnosis of the underlying issue and an open, informed discussion with the patient are absolutely essential.
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I will discuss the following factors for consideration:
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Location of the tooth as it relates to visibility and oral anatomy
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Skill and comfort of the operator
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Identifying and qualifying the proper periodontal condition that impacts the success rate of apicoectomy
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Judging the expectations and character of the patient
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Patient health considerations
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1.) Location of Teeth
The positioning of teeth plays a significant role in determining the complexity of dental treatments. In every branch of dentistry, we encounter challenges based on tooth location. For example, scaling the distal-lingual line angle of tooth #31 is far more demanding than working on the mesial surface of tooth #8. Placing a DO restoration on tooth #2 is tougher compared to a straightforward class 1 on tooth #12. Likewise, performing an apicoectomy on the distal root of #30 presents more difficulty than one on a maxillary lateral incisor.
As a general guideline, surgical procedures on anterior teeth tend to be more manageable than those on posterior teeth. Simply put—if you can clearly see the area, treatment is more feasible. If visibility is limited, expect greater challenges.
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the exceptions could be lower anterior teeth with steep buccal inclinations thus making the root tips tilted far lingually.
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tilted teeth/rotated teeth
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maxillary canines that are extremely long
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interference of anterior nasal spine with maxillary centrals
Additionally, there are anatomical structures that must be considered with the surgical approach.
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mandibular canal
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mental foramen/nerve
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maxillary sinus
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palatal approach for palatal roots (not commonly done)
Certainly with the use of CBCT imaging allows much better selectivity when offering this treatment approach by the precision of measurements and identification of the interfering anatomy. At this point in our office we never perform an apicoectomy without a CBCT regardless of tooth location.
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I will say though that while we consider ourselves to be overly safe in our selection process with regards to anatomy, I think that you might be surprised that the treatment is much safer than your original preconceptions. What I mean is that a nearby sinus is not at all an absolute contraindication (figures 1,2,3,4). Additionally, what you might think is too close for a mandibular canal is sometimes not a problem. (figure 5,6,7)​​​​​​​​​​​​​​​
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There are a host of other factors that affect visibility such as hemeostasis, appropriate flap design to exposure the surgical site, etc. Perhaps in another future blog post I will tackle those issues, but for now let us move on to the second category of this blog which is the skill and comfort of the operator.
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2.) Decision Making Process.
This part of the decision-making process leans more toward personal reflection and subjective judgment. What feels routine or comfortable for one clinician in a controlled office setting might present challenges for another. Similarly, situations that others find manageable may fall outside our personal comfort zones. While we all view ourselves as proficient in microsurgical techniques, it's important to recognize that we each have our own limitations. Personally, I avoid performing surgery on second molars and have opted out of procedures due to inadequate lip retraction, severe tooth angulation, and other complicating factors. The key, in my opinion, is to carefully evaluate the clinical scenario and make an honest assessment of whether our own expertise aligns with what’s required to achieve optimal results.
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3.) The Third Category.
The periodontal status of a tooth plays a huge factor in prognosis of treatment. Simply stated; the better the periodontal support, the better the prognosis. As you can imagine a tooth with little bone support will result in a failed surgical treatment and tooth loss.
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There is way to categorize the periodontium introduced by my mentor Dr. Kim (University of Pennsylvania). He has created 6 categories: A, B, C, D, E, F.
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Category A and B would be defined as very good periodontal support with normal sulcular depths and buccal plate intact. Category A has no apical lesion and Category B and an apical lesion. The image below would show the surgical appearance once the tissue has been flapped.
Category C has normal sulcular depth and buccal plate intact, but the apical lesion extends about half way up the root.​ Category D has an apical lesion, but in this case the buccal bone starts to become compromised and the sulcular depth extends well onto the root surface.
Category E is a condition where the apical pathology and the periodontal sulcus depth do join in a true combination periodontal/endodontic infection. The image below also shows the surgical view once the tissue has been flapped back.
Category F is of course the worst periodontal condition for a tooth with no buccal bone at all and total attachment loss to the apex of the root. You can again see the image showing this surgical view with a total lack of buccal plate.
It should be clear that category A, B will lead to the best chances for a surgical success. I also feel that category C conditions lead to predictable outcomes as well. The drop off in success really occurs most steeply at category D and the final categories of E and F should essentially be avoided entirely.
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A very good examination of the tissue and probings are very important. And now that we have CBCT imaging we can certainly better assess the presence of the bone and tightness of the bone around all root surfaces leading to better decisions.
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4.) Patient Assessment.
Naturally, this applies to nearly all dental procedures, but especially to those that are perceived as more complex—such as root canals, surgical procedures, extractions, or dental implants. There are plenty of cases where the ideal conditions are fully met: the tooth is in a visible and accessible spot, the clinician is confident and experienced with the technique, and the surrounding periodontal health is excellent. Yet even then, a patient might struggle mentally with the idea of an apicoectomy.
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In my opinion, much of the resistance stems from the word “surgery.” That one word tends to trigger anxiety. If the term “surgery” weren’t used, many patients might feel more comfortable considering the treatment. This is particularly relevant since there are often alternative paths available—like nonsurgical retreatment, extraction, or placing an implant or bridge.
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In fact, many patients tell me after the procedure that it was far easier than they imagined. They were numb the whole time, we took breaks as needed, and they felt comfortable asking questions—all of which made the process more tolerable. I also find that recovery after surgical treatment is often smoother than that of retreatment. Post-op flare-ups involving significant pain or swelling are uncommon.
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That said, even with thorough explanation and reassurance, there are always a few patients whose anxiety prevents them from being good candidates. In those cases, microsurgical endodontics may not be the right approach.
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5.) The Final Point
The final point is the most fundamental—evaluating a patient’s overall health status, which is always essential regardless of the treatment being considered. However, when it comes to surgery, a more detailed assessment of the patient’s medical condition and current medications is critical. I’ll save that deeper dive for another time, as a full review of medical history could fill volumes—not quite the right fit for a short blog post.
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I hope this offered some value and gave you a bit more perspective on just a few of the factors we take into account during the diagnostic process.
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