This goes in the win column…i.e. from a Rick Schwartz ITT standpoint, this tooth might be yarded out.
From a van Velzen standpoint:
———- Forwarded message ———
From: Bayes <firstname.lastname@example.org>
Date: Tue, Dec 31, 2013 at 10:11 AM
Subject: Re: Screw retained
It is obvious, however, that the decision to treat or not to treat a tooth with an unfavorable prognosis will be one of the factors determine the rate of success or failure. To keep the records straight, the tooth extracted because of an unfavorable endodontic prognosis should be counted an endodontic failure. Probabilities of success and failure in endodontitc treatment: A Bayesian approach. Thoden van Velzen et al. 1981
So a 15 year outcome here beats an extraction, which is 0% at 15 years.