Abstract : Purpose : Invasive cervical resorption is a complex form of absorption that can be difficult to diagnose clinically. The amount of information available in the two-dimensional evaluation by radiographic examination is limited. Moreover, not only the pathological condition but also the diagnosis of the pulp and apical periodontal tissue may significantly change the treatment planning. We report here a case in which the pathophysiology of invasive cervical resorption was accurately grasped using CBCT and the treatment was planned accordingly.
Case : The mandibular right second molar showed a positive reaction in the electric pulp test, and the cold test showed a transient strong positive reaction, which was clearly different from the control tooth, although there was no persistent pain. Periodontal pocket testing revealed a 6-mm pocket from the distal buccal side to the furcation area of the second molar. Radiographic examination revealed a transmission image in the distal crown. The affected tooth was the right second molar of the lower jaw, the pulp was diagnosed as reversible pulpitis, and the apical periodontal tissue was diagnosed as normal apical periodontal tissue. As for the pathological condition, caries, internal resorption or external resorption was considered. Therefore, CBCT imaging was performed. From the laboratory findings, the medullary cavity and root canal structure were normal, but a resorption site was found in the cervical region, suggesting invasive cervical resorption. Aiming to achieve a better prognosis, we decided to perform root canal treatment and curettage/repair of the resorption part.
Discussion : In this case, CBCT images showed 3Bp invasive cervical resorption according to Patel’s classification, and the spread of the pathological condition could be accurately grasped. As a result, problems could be identified accurately, which helped to determine the treatment planning, resulting in the success of this case and a better prognosis.
Conclusion : For cases of invasive cervical resorption, performing 3D CBCT imaging to consider the location, extent, and proximity to the medullary cavity of the resorption site may assist better treatment planning.
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