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A case-control study was carried out at the University of North Carolina School of Dentistry in the US. PARTICIPANT SELECTION: Dental charts from the university's dental clinical were audited for patients who had a single-cast crown between 1 January 1998 and 31 December 2002. Cases were defined as individuals who underwent root canal treatment at some time after the insertion of a single-cast crown up to 1 July 2004. The control group consisted of people who did not have root canal treatment after the insertion of a full-cast crown.

Patient's age and extent of coronal and root destruction predict root canal treatment subsequent to after a full-cast crown