Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7170851 | International Journal of Adhesion and Adhesives | 2018 | 7 Pages |
Abstract
This study evaluated the effect of distinct bonding strategies on the retention of full-contour zirconia ceramic (Y-TZP, FCZ) crowns, and it characterized some physicochemical and mechanical properties of FCZ ceramic and its corresponding glazing system. To evaluate retention strength, dies were made with a dentin-analogue material to simulate a prepared tooth. FCZ crowns were manufactured using CAD-CAM technology and allocated into groups according to the bonding strategy: no ceramic treatment (PF - Panavia F cementation), glaze (GL), tribochemical silica coating (CJ), CJ + GL, and piranha solution followed by glaze (PS + GL). The specimens were subjected to thermocycling and storage in distilled water for 100 days before the retention tests. FCZ presented a porosity volume fraction of 0.2%, an apparent density of 6.06â¯g/cm3, Vickers hardness of 12.4 ± 0.07â¯GPa, and fracture toughness of 5.54 ± 0.24â¯MPaâ¯m1/2. SEM revealed a homogeneous microstructure composed of submicron-sized grains. XRD identified mainly zirconia's tetragonal phase. Glaze powder morphology was observed to be irregular, with a nanometric particle size, and a diffraction pattern characteristic of an amorphous material with several peaks of leucite. The PF and GL groups had higher retention values. The majority of the groups presented pre-test bonding failures, and two catastrophic failures of the FCZ-crown (GL and PF groups) were noted. The use of an MDP-containing resin cement or glaze application might improve retention of the FCZ crowns.
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Authors
Sabrina A. Feitosa, Fernanda Campos, Walter Kenji Yoshito, Dolores R.R. Lazar, Valter Ussui, Luiz Felipe Valandro, Marco A. Bottino, Marco C. Bottino,