Effect of final temperature and heating rate on the mechanical and optical properties of a zirconia veneering ceramic
Küçük Resim Yok
Tarih
2024
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Purpose: To evaluate the effect of firing temperature and heating rate on the volumetric shrinkage, translucency, flexural strength, hardness, and fracture toughness of a zirconia veneering ceramic.Material and methods: Zirconia veneering ceramic specimens (N = 45) with varying final temperatures (730 degrees C, 750 degrees C, and 770 degrees C) and heating rates (70 degrees C/min, 55 degrees C/min, and 40 degrees C/min) were fabricated (n = 5). Each specimen's shrinkage, translucency, flexural strength, hardness, and fracture toughness were determined. Two-way analysis of variance, Scheff & eacute; test, and Pearson's correlation analysis were used to evaluate data (alpha = 0.05).Results: The shrinkage (44.9 +/- 3.1-47.5 +/- 1.6 vol%) and flexural strength (74.1 +/- 17.4-107.0 +/- 27.1 MPa) were not affected by tested parameters (P >= 0.288). The interaction between the main factors affected the translucency, hardness, and fracture toughness of the specimens (P <= 0.007). Specimens with 770 degrees C final temperature and 70 degrees C/min heating rate had the lowest (21.8 +/- 3.2 %) translucency (P <= 0.039). The hardness ranged between 4.98 +/- 0.51 GPa (730 degrees C; 70 degrees C/min) and 5.60 +/- 0.37 GPa (770 degrees C; 70 degrees C/min). Fracture toughness ranged between 0.54 +/- 0.04 MPa root m and 0.67 +/- 0.08 MPa root m with the highest values for specimens fired at 730 degrees C with 70 degrees C/min (P <= 0.001). There was a positive correlation between translucency and hardness (r = 0.335, P = 0.012), and a negative correlation between fracture toughness and all parameters other than shrinkage (translucency: r = -0.693/P < 0.001, flexural strength: r = -0.258/P = 0.046, hardness: r = -0.457/P < 0.001).Conclusions: Heating rate and final temperature should be considered while fabricating veneered zirconia restorations with tested ceramic as they affected the translucency, hardness, and fracture toughness.
Açıklama
Anahtar Kelimeler
Veneering Ceramic, Firing, Translucency, Shrinkage, Mechanical Properties
Kaynak
Journal of the Mechanical Behavior of Biomedical Materials
WoS Q Değeri
N/A
Scopus Q Değeri
Q2
Cilt
149
