Hands OnResin bonding to high-strength ceramics
Section snippets
Background
New ceramics have been developed to meet the demand for high-performance esthetic restorations. These include glass-infiltrated alumina and zirconia, densely sintered alumina, and yttria-partially stabilized tetragonia zirconiapolycrystalline ceramic (Y-TZP). Although conventional adhesive bonding techniques have proved effective with silica-based or feldspathic ceramics, they have difficulty establishing a strong, stable bond with these new high-strength ceramics, which are hard,
Methods
The PubMed and Google Search databases were searched, along with hand searches, to identify publications in the English language that addressed resin-ceramic bonds and similar topics. Multiple techniques have been tried, and various ways to test bond strength have been undertaken.
Bonding Results
Mechanical methods of obtaining a strong bond include airborne particle abrasion (APA) and tribochemical silicoating. Some studies found that APA substantially increases the roughness and surface area of ceramic surfaces, increases the potential for micromechanical retention, and increases bond strength. It can also clean the surface of contaminants or saliva, which may compromise chemical bonding. Several studies also noted an increase in the flexural strength of Y-TZP zirconia with APA.
Testing Methods
Many of the basic concepts that are used in shear testing have been demonstrated to be incorrect. Recently tests have been suggested that measure microtensile bond strength with a perpendicular load and small specimen size; the combination of bond strength tests and chemical analysis, fractographic analysis, and cyclic loading; an assessment of the tooth/composite/porcelain interface; and clinical trial results. The microtensile test is tedious and requires considerable time and effort to avoid
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Luthra R, Kaur P: An insight into current concepts and techniques in resin bonding to high strength ceramics. Austral Dent J 61:163-173, 2016
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