Microtensile Bond Strength of Lithium Disilicate to Zirconia with the CAD-on Technique
Abstract
Purpose: Recently, a novel technique was introduced to combine lithium disilicate and zirconia into one restoration. The purpose of this study was to compare the microtensile bond strength of veneering ceramic to a zirconia core in two different techniques: the e.max(registered trademark) CAD-on technique and the Press-on technique (Ivoclar Vivadent). Materials and Methods: Group A was prepared by veneering sintered zirconia blocks (e.max(registered trademark) ZirCAD, Ivoclar Vivadent) with lithium disilicate blocks (e.max(registered trademark) CAD, Ivoclar Vivadent) using the CAD-on technique according to manufacturers instructions. Group B was prepared by taking sintered e.max(registered trademark) ZirCAD blocks and veneering them with fluorapatite glass-ceramic (e.max(registered trademark) ZirPress, Ivoclar Vivadent) using the Press-on technique according to manufacturers instructions. Each block was loaded in a dynamic cyclic loading machine. The blocks were then sectioned into 1mm x 1mm beams (n=43) using a precision saw, thermocycled, and loaded in tension until failure on a universal testing machine (Instron). A mean and standard deviation were determined per group. Data were analyzed using an unpaired t-test (=0.05). Results: The mean microtensile bond strengths were 44.0 + or - 13.8 MPa for the CAD-on technique and 14.9 + or - 8.8 MPa for the Press-on technique. Significant differences were found between the two groups (p<0.05). Conclusions: The CAD-on technique (lithium disilicate / zirconia) resulted in greater microtensile bond strength than the Press-on technique (fluorapatite glass-ceramic / zirconia).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 10, 2014
- Accession Number
- AD1127835
Entities
People
- James J. Renda
Organizations
- Uniformed Services University of the Health Sciences