Root canal treatment must be done properly by the dentist. Care must be taken to have a good oral hygiene. Systemic illness like uncontrolled diabetes may compromise the tooth status. This in turn can affect the life of your crown in future.

Firstly, RCT should be perfect ( no flaws etc ). After that proper filling and crown should be given.. If there is improper rct done by doctor then a good crown is of no use.. Re- infection again occurs in the same tooth due to improper rct and filling.

no ..u have t take proper care fr dat...firstly avoid bitting on hard foods...brush properly and keep dat area clean...we gaurrenty 10yrs life....but it is advisable t replace d crown every 5-7 yrs ....depending on tooth condition

Yes

RCT and capping are two separate procedures which are done in tandem but have different reasons behind the purpose that they solve. RCT is done to remove the infection in and around the tooth and relieve the patient of the symptoms, and because root canal treatment is mostly required for teeth which are grossly damaged otherwise, capping is done to add strength to such hollow teeth so that they can withstand the forces of chewing efficiently. So these two procedures are interdependent but actually independent of each other. A good quality cap will definitely provide excellent strength to the tooth but failure of RCT is mainly because of Re infection and that is because of plaque accumulation which is not removed efficiently by the patient and that does not depend upon the quality or the type of cap put on the tooth. Your role in meticulous oral hygiene maintenance cannot be overruled under any circumstances. Regards.