apicoectomy procedure,is it necessary with every root canal in case you ever have infection later

It depends on how bad the condition is now and how often do the infections repeat, but apicoectomy is definitely the only way of making certain that the infection will not return, as far as that abscessed tooth is concerned because all infected tissue gets removed from the gym which definitely does give you far better chances of not having similar problems in surrounding area, because source of infection will be eliminated completely.