Assertion: occipital bone's surface | /r/CapableOf | contact the skull
Facets:
Source sentences:
text: 1) anti-migration features, for example protrusions such as hooks or spikes; 2) anti-slip features, for example surface treatments such as roughening by means of bead-blasting on the anterior surface of the implant as the anterior surface contacts the skull; 3) bone ingrowth features; and 4) combinations of the above.