1. Introduction: Tips for Trusting Your Dentist’s Judgment

“We have no choice but to remove the nerve,” or “We should extract this tooth and get an implant.” Sitting in a dental chair and hearing these words can trigger profound anxiety. It is a heavy burden to decide the fate of a part of your own body in a split second.

Many people expect “Evidence-Based Dentistry (EBD)” to provide a single, perfect answer that guarantees success. However, the reality is not so simple. In the world of root canal treatment (endodontics), significant “uncertainty” remains. In fact, there are concerns that the term “evidence” can sometimes be used to suppress clinical freedom or serve as a mechanism for cost-cutting. This article unveils the surprising reality of evidence in dentistry to help you make treatment choices you can truly live with.

2. Evidence Consists of Three Elements: Research is Only One Part

In dentistry, “Evidence-Based Dentistry (EBD)” is often misunderstood as simply “following the latest research papers.” However, true EBD is a deeply human process formed by the overlap of three equal elements:

  1. RESEARCH: The best external evidence from systematic studies.
  2. CLINICAL EXPERTISE: The proficiency and judgment a dentist gains through experience.
  3. PATIENTS’ NEEDS AND PREFERENCES: The unique hopes and life circumstances of each individual.

The essence of EBD lies at the center where these three circles overlap. Notably, “patient preference” is included not just for customer satisfaction, but as an essential ethical obligation based on the principle of “Autonomy.” Statistical data shows “average trends,” but it cannot define the happiness of “you” as an individual. A “correct” treatment that ignores your values is not truly evidence-based medicine.

3. The Value of “Practical Wisdom”: Aristotle’s Phronesis

Root canal treatment involves a “craftsmanship” aspect that cannot be mastered solely through reading papers or attending lectures. For example, the skill required to create a proper access cavity and clean hair-thin, complex, curved canals is not acquired overnight.

Dentists must be able to judge “what to do here and now” depending on the situation. This is nothing other than what Aristotle called Phronesis (practical wisdom). As the literature emphasizes: “External clinical evidence can inform, but never replace, individual clinical expertise. It is this expertise that decides whether the external evidence applies to the individual patient at all and, if so, how it should be integrated into a clinical decision.”

A great dentist hones this phronesis through practice on models, real-world experience, and deep reflection on their own failures. Even with the “map” of research, a “skilled navigator” is needed to traverse the actual complex terrain.

4. The Shocking Fact: Top-Tier Research is Only 3.7%

The “Evidence Pyramid” is used to evaluate the reliability of information, with the apex representing the highest quality. However, a cold truth is hidden here: among papers published in major endodontic journals, only 3.7% (as of 2010) were Randomised Controlled Trials (RCTs)—the highest level of evidence.

Why so few? Because of the sheer number of variables in dentistry. Unlike drug trials, “blinded” studies (where you pretend to extract a tooth) are difficult. Furthermore, uncontrollable factors like anatomical diversity, infection status, and the length of disease processes make “perfect proof” scientifically elusive and incredibly costly to obtain.

5. The Patient is the Expert on Their Own Feelings

The final decision-maker is the patient, not the dentist. While the dentist is an expert on “how to save the tooth,” the patient is the only expert on their own Quality of Life (QOL).

  • Which symptoms are tolerable?
  • Which risks are worth taking?
  • What level of cost is acceptable?

You are the only person in the world who can decide these things. Informed consent is not a mere administrative formality; it is the vital EBD process where you filter the risks and benefits presented by the dentist through your own “survival strategy.”

6. The Trap of “Statistical Significance” vs. “Clinical Significance”

Do not be misled by the phrase “statistically significant.” Numerical “correctness” does not always align with “value” in real life. Consider a hypothetical study comparing single-visit vs. two-visit root canal treatments:

  • Healing rate for 1 visit: 87.1%
  • Healing rate for 2 visits: 91.5%

Is this 4.4% difference important? In a small study, this might be labeled “not significant.” Conversely, in a study of tens of thousands of people, even a 1% difference is “statistically significant.” But is that tiny difference worth the extra cost or time to you? If a patient’s priority is “minimizing visits,” that choice carries great clinical significance even if the numbers are similar. You must look behind the numbers to see what actually matters to you.

7. Conclusion: Toward “Good” Dentistry for the Future

Gaps still exist in the scientific evidence for root canal treatments. Even with modern science, it is impossible to declare a “100% correct answer” for every case.

Therefore, what we should seek in a dentist is not just a volume of knowledge. It is “the attitude of attempting to apply the best available evidence in daily clinical practice.” And, when evidence is lacking, it is the integrity to prioritize “treatments based on established theoretical hypotheses” rather than guesswork.

Next time you sit in the dental chair, have the courage to share your values. The best medical care exists only where the doctor’s skill, the language of science, and your heart overlap.

“Will you choose a treatment based only on numbers, or one that respects your values?”

Reference

Bergenholtz, G., & Kvist, T. (2014). Evidence‐based endodontics. Endodontic Topics, 31(1), 3-18.

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