ANALYSIS OF PROCEDURES THAT MAY INFLUENCE THE RETENTION OF GLASS-FIBER POSTS, MEASURED IN TRACTION TESTS.

Glass-fiber prefabricated posts are used as an alternative in restoration and later reconstruction of endodontically treated teeth; they are sealed with resinous cement to increase their retention and improve the mechanical performance of the restored tooth. They reduce the incidence of root fractures, since elasticity modules of fiber posts are closer to the dentin than those of metal posts.
The purpose of this study is to analyze each of the factors involved in the retention of preformed glass-fiber posts to the root dentin substrate and thus acquire new key concepts about retention of this type of posts for future implementation of new methods that will ensure restoration permanence, under oral conditions, as well as clinical success.
Objectives: To analyze some procedures that may influence the retention of glass-fiber posts, measured in traction tests. These procedures comprise glass-fiber post surface sandblasting, and silane coating, to investigate their influence in the retention of root canal posts. To compare the different fiber post designs, to establish the root diameter and the fiber post diameter ratio, the use of dual cure autoconditioning cement, as an alternative in the reduction of steps for fiber post cementation technique.
Materials and Methods: The sample will consist of 180 right teeth with one root. Each will be cleaned and X-rayed to observe the root anatomy and to discard those that do not comply with the study expectations. Later on this sample will be divided into 3 groups. Group 1 will have 4 subgroups, each with n = 15; Group 2 will have 2 subgroups, n = 30 each; Group 3 will have 4 subgroups with n = 15 each. The traction test comprises the preparation of samples to be subjected to a microtensile test in its two variants, trimming and non-trimming, and the pull-out test as a complementary technique.