Shaping Ability of XP-Endo Shaper Files With Extended Use Time and R40 Blue in Oval Canals: A Microcomputed Tomography Study in Contralateral Premolars.

Introduction: This study evaluated the shaping ability of the single-file XP-endo Shaper (XP-S) system, employing an extended working time, and the Reciproc Blue number 40/.06 (REC) instrument during the preparation of oval-shaped canals.

Methods: Eleven pairs of contralateral premolars with a single canal were divided into two groups (n = 11) according to the canal preparation protocol: XP-S (with an additional 45 seconds of instrumentation) and REC.

Hearing preservation with the retrosigmoid approach for vestibular schwannoma: myth or reality?

Objective: The purpose of this study is to present our experience with the retrosigmoid approach for vestibular schwannoma resection, emphasizing our hearing results, discussing selection and reporting results criteria.Study design and setting The notes of 65 consecutive cases of vestibular schwannoma undergoing the retrosigmoid approach were reviewed. Hearing data were reported according to the recommendations of the American Academy of Otolaryngology-Head and Neck Surgery (AAO-HNS).