subocclusal surface

sub·oc·clu·sal sur·face

a portion of the occlusal surface of a tooth that is below the level of the occluding portion of the tooth.
Farlex Partner Medical Dictionary © Farlex 2012

sub·oc·clu·sal sur·face

(sŭbŏ-klūzăl sŭrfăs)
Portion of occlusal tooth surface below level of occluding portion.
Medical Dictionary for the Dental Professions © Farlex 2012