Abstract
This study evaluated the bond strength of veneering porcelain with an experimental conditioner-coated zirconia. Pre-sintered Y-TZP specimens (n = 44) were divided in two groups based on conditioning type. After sintering, all sample surfaces were sandblasted and layered with veneering porcelain. Additionally, half of the specimens in each group underwent thermal cycling (10,000 cycles, 5–55 °C), and all shear bond strengths were measured. After testing, the failure mode of each fractured specimen was determined. Differences were tested by parametric and Fisher’s exact tests (α = 0.05). The differences in bond strength were not statistically significant. Adhesive fractures were dominantly observed for the non-thermal cycled specimens. After thermal cycling, the conditioner-coated group showed cohesive and mixed fractures (p = 0.0021), whereas the uncoated group showed more adhesive fractures (p = 0.0021). Conditioning of the pre-sintered Y-TZP did not change the shear bond strength of the veneering porcelain, but did improve the failure mode after thermal cycling.
Highlights
Commercial zirconia products are widely used as substrates of dental prostheses, and as monolithic or full-contour restorations [1,2]
The purpose of this study is to test the shear bond strength between a veneering material and a commercial zirconia product treated with the conditioner before sintering, and evaluate the failure mode on its fractured surface
This study focused on the influence of a specific conditioner method on the bonding of a zirconia
Summary
Commercial zirconia products are widely used as substrates of dental prostheses, and as monolithic or full-contour restorations [1,2]. Based on a recent systematic review of bilayer ceramic restorations, zirconia-based single crowns have survival rates comparable with metal-ceramic single crowns [1]. Zirconia ceramics have superior mechanical properties that are similar to those of some metallic materials. Loss of retention and veneering ceramic fracturing are much more significant issues in zirconia-based ceramic restorations compared with metal-ceramic restorations [1]. To address the loss of retention issue, previous studies have indicated simple and clinically-reliable bonding methods in resin-bonded oxide ceramic restorations [3]. Complex mechanisms with a variety of risk factors are present in the oral cavity [4], making it difficult to identify the primary causes of chipping and delamination of veneering porcelain in clinical situations
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