Failure loads, fatigue resistance and modes of failure of different veneering systems on zirconia copings
Date
2015
DOI
Authors
Hajjaj, Maher S.
Version
OA Version
Citation
Abstract
Objectives: The most common technical complication associated with zirconia based allĀ ceramic restorations is veneer fracture. Objectives of this study were to evaluate the effect of veneering techniques, coping design and chewing simulation on the failure load and the mode of failure of veneered zirconia crowns.
Materials and Methods: 2 zirconia materials were used in this study; Vita In-Ceram YZ and IPS e. max ZirCAD. 160 Zirconia copings/material (320 specimens) were designed into standard uni-thickness or anatomically reduced copings. Correspoonding veneering porcelains were applied using 4 different techniques; conventional hand layering (VM9, IPS e. max Ceram), pressed-on (PM9, IPS e. max Zirpress), CAD/CAM (Vita Mark II, IPS e. max CAD) cemented using resin cement and fused using low fusing porcelain onto zirconia copings. Final crowns were cemented on prefabricated aluminum dies using Multilink Automix resin cement. 10 specimens/ group were loaded under compression using universal testing machine at a rate of 0.5 mm/minute until fracture. Another 10 specimens were subjected to cyclic loading (chewing simulation) at 30% of the mean failure load in water bath for 105 cycles at frequency of 1 Hz, and then were loaded under compression to fracture. Data were statistically analyzed using ANOVA and post hoc Scheffe test at a =0.05.
Results: Veneering technique, cyclic fatigue and coping design had a significant effect on the failure load of veneered zirconia crowns.
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Thesis (DScD) --Boston University, Henry M. Goldman School of Dental Medicine, 2015 (Department of Prosthodontics).
Includes bibliographic references: leaves 170-181.
Thesis (DScD) --Boston University, Henry M. Goldman School of Dental Medicine, 2015 (Department of Prosthodontics).
Includes bibliographic references: leaves 170-181.
License
This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.