Fate of root shell after pontic/socket shield techniques, is it better to extract the whole tooth?

Figure 3 The ‘Socket-shield’ technique step-by-step. A: Tooth in bony socket; B: The tooth in concern is sectioned horizontally 1 mm above the bone crest; C: Root is sectioned longitudinally in facial and palatal halves; D: The palatal section is extracted; E: The facial root section is concaved with a long shank dental bur; F: Immediate placement of dental implant palatal to the retained root fragment. The jumping space if any can be grafted is possible.