د. زهراء الحمداني ( المرحلة الرابعة)

🔹 𝐈𝐦𝐩𝐨𝐫𝐭𝐚𝐧𝐭 𝐍𝐨𝐭𝐞𝐬 : ♦️ 1. Hinge axis or transverse horizontal axis: An imaginary line around which the mandible may rotate within the sagittal plane. 2. Sagittal axis of the mandible : An imaginary anteroposterior line around which the mandible may rotate when view in the frontal plane. 3. Vertical axis of the mandible: An imaginary line around which the mandible may rotate through the horizontal plane. ♦️ Extreme Movements in the Sagittal Plane : A characteristic "Beak tracing". Extreme Movements in the Horizontal Plane : characteristic "Diamond tracing". Extreme Movements in the Coronal Plane : characteristic "shield tracing". ♦️ Envelope of Motion When we combine the border movements of all the three planes, we get a three-dimensional space within which mandibular movement is possible. It was first described by Posselt in 1952. #pros_fourth

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