Related Experiment Video
Updated: Feb 1, 2026

Behavioral Assessment of the Aging Mouse Vestibular System
Published on: July 11, 2014
Y-TZP surface behavior under two different milling systems and three different accelerated aging protocols
Amanda M Dal Piva1, João Paulo Tribst2, Laísa D Gondim3
1Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, Brazil - amodalpiva@gmail.com.
Background:
To evaluate the influence of aging and milling system on zirconia surface roughness (SR) and phase transformation.
Methods:
Eighty crowns were divided in two groups according to yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramic milling system (CAD-Neodent or MAD-Zirkonzahn). The crowns were submitted to different aging protocols (N.=10): 1) no aging; 2) autoclaving; 3) pH cycling; or 4) thermocycling. Next, the samples were submitted to an optical profilometry analysis to determine differences in the SR (µm). An X-ray diffraction analysis (XRD) was performed to quantify the percentage of monoclinic phase transformation. SR data was analyzed by two-way ANOVA (α=0.5%).
Results:
Aging protocol (P=0.42) and milling system (P=0.08) had no influence on the SR. However, the number of monoclinic phases was influenced by the autoclaving and pH cycling.
Conclusions:
The surface roughness of zirconia-based crowns was not influenced by low temperature degradation or milling system. Regarding the phase transformation, autoclaving and pH-cycling aging presented a monoclinic phase increase when compared to the control group and thermocycled groups.
Related Concept Videos
Variation in Acceleration due to Gravity near the Earth's Surface
The difference between the true and apparent weights is proportional to the square of the Earth's...
Accelerators
The effectiveness of calcium chloride can...
Aging
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Average Acceleration
Instantaneous Acceleration
Acceleration Vectors

