Feldspar Ceramic Strength and The Reinforcing Effect by Adhesive Cementation Under Accelerated Aging

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.

Substantial in-vitro and emerging clinical evidence supporting immediate dentin sealing

“…It is believed that with the IDS technique, the delayed final bonding and functional loading of the restoration, allows the development of dentin bond to develop without stress and, therefore, subjects the restoration to less crack development [ 104 , 105 ]. This, in addition to the findings that bonding ceramic restorations to tooth structure strengthen ceramic restorations [ [97] , [98] , [99] ], would contribute to improved fracture strength of bonded restorations observed following the IDS technique.…”

“…Adhesive cementation of ceramic restorations has been shown to increase the fracture strength of restored teeth [ [94] , [95] , [96] ] and bonded ceramic restorations [ [97] , [98] , [99] ]. Spohr et al [ 100 ], have provided evidence that IDS procedure increases the fracture load of full ceramic crowns [ 100 ].…”

Evaluation of zirconia and zirconia‐reinforced glass ceramic systems fabricated for minimal invasive preparations using a novel standardization method

“…Since in this technique the ceramic thickness should be minimal, the ceramic used in this study at the marginal area have a thickness of 0.5 mm only requiring materials that have higher fracture resistance. 27 This in-vitro study aimed to compare the fracture resistance applied to monolithic zirconia and zirconia reinforced glass ceramic with horizontal and vertical preparation under static compressive load (not cyclic). Moreover, modes of fracture were evaluated qualitatively using Stereomicroscope and Scanning Electron Microscope.…”

Influence of feldspar ceramic thickness on the properties of resin cements and restorative set

“…Feldspathic ceramics are considered to have better optical properties, which is attributed to their high content of glass‐matrix, and this limits their mechanical properties [3]. Thus, the clinical success and longevity of feldspathic ceramic restorations depends on the adhesive cementation procedures [4–6].…”