For teeth with moderate quantities of residual coronal tissue and treated with modern Ni-Ti instruments.
The double conical shape of Endodontic Self Posts
The greater diameter can be found near the point where, on average, the post emerges from the tooth. In this way, stresses are discharged by the more resistant portion of the post, giving a great advantage in the overall strength of the restored tooth.
The clinical advantage of Endodontic Self Posts
When the teeth have a moderate residual coronal structure or when more than one post is inserted in the canals of the same tooth, the coronal part of the post may interfere with either the residual dental structure or with the other post: the conicity of this portion has the effect of considerably reducing the interference in both cases, improving the insertion of the post, even in teeth with a considerable amount of residual coronal dentin.
The shapes and diameters have been calculated for use with Ni-Ti instruments, as they accurately reproduce the conicities, which are 0.04, 0.06 and 0.08.