Objective To study the shape and location of root canal orifice in maxillary first permanent molar and provide a morphological basis for locating canal orifice in endodontic therapy.

目的研究上颌第一磨牙根管口形态和位置关系，为根管治疗时寻找根管口提供解剖学依据。

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An open G chord is technically third position given its location of the root note, but in Rock Band 3, that particular variant displays a "2" that falls on the A string.

ENGADGET: Rock Band 3 Pro guitar preview: the guitarist vs. the guitar hero