A new approach to endodontic treatment and operative procedure in nonendodontically treated posterior crown root fractures.

We report a case of nonendodontically treated first upper premolar crown root fracture in which the palatal cusp fracture extended below the cementoenamel junction. Reattachment of the palatal cusp in its original position by acid-etch and flowable composite allowed the creation of a standard access opening as in an intact tooth, avoiding apex location errors and contamination of the root canal. During crown-lengthening surgery, the palatal cusp fragment was hollowed out and used as a natural individual matrix for placement of the core material.