| 摘要 |
An endodontic instrument for accessing a pulp chamber of a molar includes an elongated shaft having an upper end and a lower end and a stop fixed to the shaft at a distance between 6-8 mm from the lower end. The instrument also includes a cutting head located along the shaft adjacent the lower end. In certain embodiments, the cutting head has an annular cutting surface extending about a first circumferential portion of the cutting head and a flat non-cutting surface extending about a second circumferential portion of the cutting head. The lower end of the shaft may have a pointed tip.
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