Pressure-induced root resorption of 2nd molar due to impacte
The present case has been reported in the journal Endodontology. A 26-year-old male reported with a chief complaint of pain in the left lower jaw region. Clinical examination revealed a grossly carious left mandibular first molar that was sensitive to percussion and palpation. Mobility was within physiologic limits.

Pulp sensibility tests were negative. Periapical radiograph of tooth #36 revealed a radiolucency in relation to the mesial root (periapical index [8] score 3). A diagnosis of symptomatic apical periodontitis was established. Single sitting endodontic therapy was accomplished. On the same intraoral periapical radiograph (IOPA), substantial blunting of the mesial root of tooth #37 and an impacted tooth #38 were evident.

Clinically, tooth #37 was healthy. Pulp sensibility tests were positive. On scanning the occlusal surface with DIAGNOdent, a reading of 22 was noted. This indicated enamel caries and was restored with glass ionomer cement. The patient was informed regarding the incidental radiological finding. Consent was taken to further investigate.

An orthopantomograph [Figure 3] revealed a fully mature horizontally impacted third molar impinging on tooth #37. Since no other contributing factor for the unusual radiographic picture of tooth #37 could be ascertained, a provisional diagnosis of pressure-induced mesial root resorption due to impacted molar was established.

The impacted tooth was atraumatically surgically removed under local anesthesia. The patient was followed up clinically and radiographically (6 and 12 months). At 18-month follow-up, IOPA revealed arrest and subsequent repair of the mesial root resorption, thus confirming the diagnosis.

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