OCCLUSION VERTICAL DIMENSION
\əklˈuːʒən vˈɜːtɪkə͡l da͡ɪmˈɛnʃən], \əklˈuːʒən vˈɜːtɪkəl daɪmˈɛnʃən], \ə_k_l_ˈuː_ʒ_ə_n v_ˈɜː_t_ɪ_k_əl d_aɪ_m_ˈɛ_n_ʃ_ə_n]\
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The length of the face determined by the distance of separation of jaws. Occlusal vertical dimension (OVD or VDO) or contact vertical dimension is the lower face height with the teeth in centric occlusion. Rest vertical dimension (VDR) is the lower face height measured from a chin point to a point just below the nose, with the mandible in rest position. (From Jablonski, Dictionary of Dentistry, 1992, p250)
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