Abstract
This study evaluated the effect of the accelerated artificial aging (AAA) on feldspar ceramic strength and the reinforcing effect promoted by adhesive cementation with resin luting agent. One hundred twenty feldspar ceramic disks were obtained. Sixty disks were acid-etched, silanized, and coated with an experimental resin luting agent simulating the adhesive luting procedures. Four groups were created (n=30): uncoated ceramic (control group), uncoated ceramic submitted to AAA, ceramic coated with resin luting agent, and coated ceramic submitted to AAA. Biaxial flexural testing with ball-on-ring setup was carried out. Biaxial flexural strength (s bf , MPa), characteristic strength (s 0 , MPa), and Weibull modulus (m) were calculated for axial positions z=0 (ceramic surface) and z=-t2 (luting agent surface). Data of s bf at positions z=0 and z=-t2 were separately submitted to statistical analyses (a=0.05). The uncoated ceramic submitted to AAA had no significant difference in s bf and s 0 compared with the control group. Resin coating of the ceramic increased s bf and s 0 at z=0. The AAA increased the s bf and s 0 for the resin-coated ceramic specimens at z=0 and also the s 0 at axial position z=-t2. The structural reliability at z=0 and z=-t2 was not influenced by the variables tested. In conclusion, resin coating improved the mechanical strength of the feldspar ceramic. The AAA procedure was not effective in aging the uncoated or resin-coated feldspar ceramic specimens.
Highlights
Feldspar dental ceramics are used in several rehabilitation treatments due to their biocompatibility, satisfactory functional and esthetic clinical outcomes [1, 2]
Four groups were tested: uncoated ceramic disks, uncoated ceramic disks submitted to artificial aging (AAA) (C-AAA), ceramic coated with resin luting agent (CR), and ceramic coated with resin luting agent submitted to AAA (CR-AAA)
The AAA had no significant influence on the σbf (p=0.129) and σ0 of the ceramic disks
Summary
Feldspar dental ceramics are used in several rehabilitation treatments due to their biocompatibility, satisfactory functional and esthetic clinical outcomes [1, 2] These ceramics are intrinsically brittle, they may be strengthened by adhesive cementation to the dental structure using resin luting agents [3,4,5]. Studies have used several methods of accelerated artificial aging (AAA) to simulate the effects of intraoral aging and evaluate the mechanical strength and other physical properties of dental materials [12,13,14,15]. The literature presents limited information about the effect of the AAA on the strength of the ceramic and of the ceramic-resin luting agent set This issue is relevant considering that very thin feldspar ceramic laminate veneers have been extensively used in restorative dentistry
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