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Advisory Committee Chair

Nathaniel C Lawson

Advisory Committee Members

John O Burgess

Daniel A Givan

Amjad Javed

Keith E Kinderknecht

Document Type

Thesis

Date of Award

2020

Degree Name by School

Master of Dentistry (MDent) School of Dentistry

Abstract

The purpose of this study was to determine the bond strength of a light cured resin when cured through 3 different types of dental ceramics (traditional zirconia with 3 mol% yttria, translucent zirconia with 5 mol% yttria, and lithium disilicate) at 2 different thicknesses. A total of 135 specimens were prepared from traditional zirconia (IPS e.max ZirCAD LT, Ivoclar Vivadent, Liechtenstein), translucent zirconia (IPS e.max ZirCAD MT, Ivoclar Vivadent, Liechtenstein), and lithium disilicate (IPS e.max CAD LT, Ivoclar Vivadent, Liechtenstein) into a plate shape, but in different thicknesses (1mm and 1.5mm). Ceramic buttons were fabricated by pressed lithium disilicate (IPS e.max Press LT A3.5, Ivoclar Vivadent, Liechtenstein). By following the surface treatment protocols applied to different ceramics, the ceramic buttons were bonded to plate specimens by curing through specimens for 10 seconds with the light-cured resin cement (Variolink Esthetic LC Neutral, Ivoclar Vivadent, Liechtenstein). In control groups, additional curing around the sides/ top of the button for 40 seconds was performed. All the bonded specimens were stored in the moist, dark, and 37 oC environment for 24 hours, then thermocycled between 5 and 55 oC with a 30 sec dwell time for 10,000 cycles. The shear load test was then performed to debond the button from each specimen, and the values were recorded as shear bond strength (MPa). The results demonstrated the insignificant reduction in shear bond strength when the light-cured resin cement was cured through a low translucency lithium disilicate specimen in A2 shade with up to 1.5 mm thickness. With the same curing settings, the bond strength reduced in both traditional and translucent zirconia when the thickness went up to 1.5mm, with translucent zirconia also showing a reduction in bond at 1 mm.

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