Il substrato dentinale lungo il post-space prima della cementazione adesiva dei perni in fibra

[automatically translated] Objectives: In the following work was evaluated the morphology of dentin surfaces along the post-space, just before the phases connected with the adhesive cementation, to check the modifications induced by the procedures that "routinely" are made to make it suitable for membership of a fiber post, during the mechanical preparation of the post-space and the conditioning of the sub dentin layer. Methods: 20 of dental elements monoradicular, extracts and divided into 2 groups endodontically treated with NiTi instruments and with two different protocols of irrigation, were prepared, with the housings for the fiber post calibrated burs. The areas along the post space were examined by SEM to three levels deep. Results: l ' SEM observation showed dentin surfaces where the cleansed areas and dentinal tubules pelvis off alternated with areas with orifices occluded tubular, covered with fine smear, and other arre entirely covered by a thick and uneven smear layer. The latter become larger as you proceed towards the apical teerzo the post-space. The morphology of the dentinal walls did not show statistically significant differences correlated to two irrigation protocols used during endodontic treatment. Conclusions: The surface morphology of the dentinal walls, in particular at the level of the apical areas of the post-space, does not seem to be sufficient to ensure the formation of an adequate hybrid layer, an essential requirement for adhesive bonding of the fiber post. In addition to the anatomical variability of the different sections endodontium, it seems that due to come into factors related to the mechanical action of the cutters for the preparation of the post-space which also contribuioscono to the formation of an atypical smearlayer, impregnated by residues cementoe ndodontico and guttaoerca . A modification of the operating protocol, which provides for greater attention to the cleansing of dentin walls after the mechanical preparation of the post-space seems desirable in order to improve the adhesion of the pin on the walls. In addition, it is essential to optimize each step of the operative protocol, so that procedures and tools are adapted to the particular morphology of the post-space. mechanical action of the cutters for the preparation of the post-space which also contribuioscono to the formation of an atypical smearlayer, impregnated by residues cementoe ndodontico and guttaoerca. A modification of the operating protocol, which provides for greater attention to the cleansing of dentin walls after the mechanical preparation of the post-space seems desirable in order to improve the adhesion of the pin on the walls. In addition, it is essential to optimize each step of the operative protocol, so that procedures and tools are adapted to the particular morphology of the post-space. mechanical action of the cutters for the preparation of the post-space which also contribuioscono to the formation of an atypical smearlayer, impregnated by residues cementoe ndodontico and guttaoerca. A modification of the operating protocol, which provides for greater attention to the cleansing of dentin walls after the mechanical preparation of the post-space seems desirable in order to improve the adhesion of the pin on the walls. In addition, it is essential to optimize each step of the operative protocol, so that procedures and tools are adapted to the particular morphology of the post-space. that involving greater attention to the cleansing of dentinal walls after the mechanical preparation of the post-space seems desirabl