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The Influence of Repeated Cementation of an Old and New Glass Ceramic Lithium Disilicate Veneers on Shear Bond Strength to the Tooth Structure (In Vitro Study) 

*Sara H. Kazzaz, **Abdul Salam R. Zahawi 

MSc Student, Department of Conservative Dentistry, College of Dentistry University of Sulaimani, Sulaimani, Iraq.
*Kurdistan Board for Medical Specialties and Department of Conservative Dentistry, College of Dentistry University of Sulaimani, Sulaimani, Iraq.

Submitted: 21/04/2019; Accepted: 30/05/2019; Published 01/06/2019



Objective: Debonding of dental veneers represents the most common problems faced the patient and the dentist. The aim of this study was to compare the bond strength of repeated bonding Glass ceramic Lithium Disilicate (LD) veneers and new veneers to the tooth structure. 

Methods: Twenty veneers from (IPS e.max CAD (LD), Ivoclar Vivadent) block  (5mm length, 3mm width and 2mm thickness) were prepared. They bonded to twenty of prepared labial surfaces of bovine teeth by using Variolink resin cement (Ivoclar Vivadent) as a sample group of twenty samples. They randomly divided into two subgroups of 10 samples named as A1 and B1 and tested under the universal testing machine to measure shear bond strength (SBS). The 10 deboned veneers of A1 rebonded on the related tooth structure after conservative cleaning of both veneers and teeth structure and assigned as group A2. While for the subgroup B1, new 10 veneers bonded on the same teeth structure and assigned as group B2. The (SBS) tested for groups A2 and B2 and compared with each other and with the previous sample groups. All debonded samples evaluated under a stereomicroscope to assess the mode of failure.

Results: There is no statistical difference between all groups and the mode of failure was mostly adhesive failure between the resin and tooth structure.

Conclusions: There are no statistical differences in bond strength between re-bonding of debonded veneer compared with of bonding of the new veneer.


Keywords: IPS e.max CAD Lithium Disilicate, Veneer, Shear bond strength, Stereomicroscope.                                                                                                                                                                                           Full Article - PDF


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