Success of a root canal treatment is very case sensitive as it is dependent on many factors
. It is dictated by what we see in a x-ray. There are many problems which we can disclose by seeing the x-ray, like a large periapical lesion, a super numerary root or root canal, a curved or dilacerated root apex, a wide apical foramen in young tooth, a partially or completely calcified root canal
Four main factors that mainly decides to do or not to do an R.C.T. are as follows
Accessibility of apical foramen through root canal.
Certain cases cant be corrected only by root canal treatment and periodontic treatment modalities are needed along with endodontic surgeries like apicosectomies treatment for an R.C.T. to be successful.
Local contraindications :-
1.When there is extensive destruction of periapical tissue involving more than 1/3rd the length of the root.
2.When the root canal of tooth is obstructed by curved root, tortuous canal, pulp stone, calcified canal, malformed tooth structure or broken instrument in the canal.
3.When there is incomplete development of root apex with death of the pulp.
4.When there is accidental or pathological perforation of root surface.
5.When there is persistent excessive exudates that can not be controlled prior to root canal filling.
6.In cases of re-treatment of root canal treated tooth when a foreign body such as fragment of gutta-percha lies in the peri-apical tissues of radiolucent teeth.
7.When an acute dental infection in previously treated or filled pulp less teeth has occurred.
8.When the root apex has fractured and pulp has died.