Figure 9 - Tooth UL1 (21) requires a crown, but there is insufficient coronal tissue remaining.
From the following article
Verifiable CPD Paper:
Endodontics: Part 2 Diagnosis and treatment planning
P Carrotte
British Dental Journal 197, 231 - 238 (2004) Published online: 11 September 2004
doi:10.1038/sj.bdj.4811612

One possible treatment plan would be elective endodontic treatment followed by the provision of a post-retained core build-up and crown.
