"pain for week after treatment"
"After 14 months knew some type of infection"
Possibly your dentist was never convinced about you tooth's long-term successful outcome, and was hesitant to recommend the expense of crown placement. This would be a judgment call.

"xrayed and stated tooth had cracked (not visible externally)"
Whether the crack had existed originally (and not detected or detectable) and was the reason for the continued problems with the tooth, or whether the tooth cracked, or the crack progressed in size, later on (would have benefited from the protection of a crown) probably can never be known.

If the crack extends below the gum line (into the root, which likely seems the case here), there is no possible repair, hence extraction is indicated.

If, per chance, the crack is confined to just one root, possibly "root amputation" could provide a solution. But even knowing that the crack was confined to a single root and didn't extend into other portions of the tooth would be difficult to definitively ascertain. This route isn't chosen very often.

"unlucky and said had been difficult due to adjacent molar"
Unlucky, yes. A crown might have made the difference. But like mentioned above, it's not always a easy recommendation to make. Also, if the tooth had been cracked originally (before its root canal treatment), having a crown may not have changed your outcome.

It's unclear/difficult to understand what the "difficult due to adjacent molar" refers to in regard to performing conventional root canal therapy.

"no antibiotics given"
Dentists have an obligation not to prescribe antibiotics if they don't think they are medically indicated.

"corner of RC treated molar cracked off and within 15 minutes large chunk of metal filler fell out"
Metal fillings are usually held in place by mechanical retention. If its corner was lost, evidently the shape of the tooth could no longer confined/retain its filling.

"apptmt made with dentists same practice who stated unsavable and would need extraction"
Possibly this could be considered a second opinion.

"showed infection at base of tooth root which said could be healing infection"
An x-ray doesn't provide an explanation for what is seen. In some cases, current problematic and historic non-problematic (healed) conditions might look similar on a film.
In your case, you have a history of symptoms with your tooth, suggesting that what is seen is infection-related.

"adjacent molar giving no probs is dead (root)"
An x-ray can be used to diagnose a dead tooth (when confirmed via other testing).
It does seem strange that your dentist hadn't noticed this.

"and needs to come out"
Generally, an extraction is the only recourse if: 1) The tooth has an advance gum disease condition that can't be remedied. 2) Something about the tooth makes it obvious that performing root canal treatment is unlikely to be successful. 3) The tooth is so damaged (decay, fracture) that it can't be rebuilt.

Extraction is sometimes discussed because not performing an expensive series of procedures for a single tooth might provide funds for other reconstructive procedures (like making a lower partial denture that would replace both molars for one fee). That's not to say that that is necessarily a good plan (and there are better (more ideal) ways to replace teeth). Just a possible option.

"Dental dam not used when root canal treatment carried out."
Here are our comments about not using a rubber dam during conventional endodontic procedures where it is possible to apply one.

After further discussion with your dentist, you may find that it just seems that its extraction is the only practical option left. In regard to your most recently diagnosed tooth, they need to provide you with further explanation. Good luck.

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