Effect of Different Veneering Techniques on Shear Bond Strength and Translucency of Bi-layered Zirconia Ceramics

Ibrahim, Yousra; Mandour, Mona H.; Shetawey, Rania A.

doi:10.21608/adjg.2018.109420

Effect of Different Veneering Techniques on Shear Bond Strength and Translucency of Bi-layered Zirconia Ceramics

Document Type : Original Article

Authors

¹ Demonstrator, Crowns and Bridges Department, Faculty of Dental Medicine, Al-Azhar University (Girls’ branch)

² Associate Professor, Crowns and Bridges Department, Faculty of Dental Medicine, Al-Azhar University (Girls’ branch).

10.21608/adjg.2018.109420

Abstract

Purpose. This study was designed to compare the effect of different veneering techniques (CAD-on, Press-on and manual layering) on the shear bond strength of veneering ceramics to zirconia framework and translucency of bi-layered zirconia based ceramics. Materials and Methods: A total of forty-eight zirconia samples were fabricated and were divided into three equal groups (n=16) according to the veneering technique used: Group (I): samples veneered using CAD-on technique. Group (II): samples veneered using Press-on technique and Group (III): samples veneered using manual layering technique. The samples of each group were subdivided into two equal subgroups (n=8) according to the testing procedure: Subgroup (A): for translucency parameter (TP). Subgroup (B): for shear bond strength. All samples were thermocycled in thermocycling device. Samples of subgroup (A) were tested for translucency parameter (TP) by using a reflective spectrophotometer. Samples of subgroup (B) were tested by using a universal testing machine. Failure modes of fractured samples were evaluated using stereomicroscope and scanning electron microscope (SEM).Data were statistically analyzed. Results: CAD-on veneered samples, group (1), recorded higher mean translucency parameter (11.099±0.452) than manual layering veneered samples, group (3), which recorded lower translucency parameter (5.463±1.255). CAD-on veneered samples, group (1), recorded higher mean shear bond strength (16.262±4.492) than Press-on veneered samples, group (2) which recorded lower shear bond strength (8.584±1.606). Conclusions: CAD-on veneered samples showed superior translucency parameter and shear bond strength than Press-on veneered samples.

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