PROBLEM TO BE SOLVED: To provide an instrument and a method for easily and accurately measuring the position and orientation of a jaw in a patient's oral cavity in dental treatment. SOLUTION: The dental measuring instrument 1 includes a wearing tool 10 to be worn in a patient's oral cavity, and an arm portion 20 connected to the wearing tool and extending from the wearing tool to the outside of the patient's oral cavity. , A tip portion 30 provided at the tip of the arm portion, and the arm portion is deformable so that the position and direction of the tip portion can be changed. [Selection diagram] Figure 1【課題】歯科治療において、患者の口腔内の顎の位置及び向きを、簡単かつ精度よく測定する器具、及び方法を提供する。【解決手段】歯科用測定器具１であって、患者の口腔内に装着される装着具１０と、前記装着具に接続され、前記装着具から前記患者の口腔外に向かって延びるアーム部２０と、前記アーム部の先端に設けられた先端部３０と、を備え、前記アーム部は、前記先端部の位置及び向きを変更可能に変形可能である。【選択図】図１
