Mechanical Evaluation of Hybrid Ceramic compared with Zirconia as an implant abutment material
Author(s): Ehab Bassam Al-sharifee* and Ahmed Asim Saeed Al-Ali
Abstract
Aim: The aims of this in-vitro study are to evaluate and compare the different mechanical properties (microhardness, flexural strength and flexural modulus) of hybrid ceramics Cerasmart & Vita Enamic) with Y-TZP zirconia (as a prosthetic dental material. Materials and Methods: The total of 40 samples (microbars) has been prepared and tested; 20 samples of hybrid ceramics (10 of Cerasmart hybrid ceramic type from GC group, America & 10 of Vita Enamic hybrid ceramic type from Vita, Germany). 5 microbars of each type of hybrid ceramic (Cerasmart &Vita Enamic) of dimensions (1.5 *20*1 mm) have been prepared for flexural strength & flexural modulus test according to (ISO specification 6872-2015) (n=5), 5 microbars of each type of hybrid ceramic (Cerasmart &Vita Enamic) of dimensions (5*25*1.5 mm) were cut for micro-hardness according to (ISO specification 6872-2015) (n=5). 20 samples of 3Y-TZP Zirconia from Zircon Zahn, Germany has been prepared. 10 microbars of 3Y-TZP zirconia of dimensions (1.5 *20*1 mm) prepared for Flexural strength & Flexural modulus test according to (ISO specification 6872-2015), 10 microbars of 3Y-TZP zirconia of dimensions (5*25*1.5 mm) were cut for micro-hardness test according to (ISO specification 6872-2015) (n=10). Results: Zirconia has higher mechanical properties in term of hardness, flexural strength and flexural modulus than two hybrid ceramics. Cerasmart hybrid ceramics has higher hardness & flexural strength values than Vita Enamic. Cerasmart hybrid ceramics has equal value of flexural modulus with Vita Enamic. Cerasmart hybrid ceramics has high values of flexural strength than Vita Enamic Conclusion: Zirconia has better mechanical properties in term of hardness and flexural strength than two hybrid ceramics. Hybrid ceramics has higher elasticity than traditional zirconia since these materials has unique structure the acrylate polymer network ensures flexibility. Hybrid ceramics especially Cerasmart is good indication for fixed prosthesis and implant abutment.