title: Influence of sodalite zeolite infiltration on the coefficient of thermal expansion and bond strength of all-ceramic dental prostheses.
abstract: In all-ceramic systems, a high incidence of veneer chip-off has been reported in clinical studies. Coefficient of thermal expansion (CTE) behaviour is one of the factors that may increase residual stress in the interface and influence the veneer/core bond strength. Therefore, this study aimed to evaluate the effect of sodalite zeolite-infiltration on the CTE behaviour and bond strength of different all-ceramic prostheses. The case-study groups were synthesized sodalite zeolite-infiltrated alumina (IA-SOD) and synthesized sodalite zeolite-infiltrated zirconia-toughened alumina (ZTA) (IZ-SOD), while the control groups were glass-infiltrated alumina (IA-glass) and glass-infiltrated ZTA (IZ-glass). Forty cylindrical-shaped samples measuring 5 mm in diameter and 10 mm in height were tested for CTE using a thermo-mechanical analyser machine, and forty disc-shaped ceramic samples measuring 12 mm in diameter and 1.2 ± 0.2 mm in thickness were prepared using specially designed stainless steel split mould and veneered by cylinder-shaped (2 mm high × 2 mm diameter) low-fusing porcelain (Vita VM7). The veneer/core samples were sintered and tested for shear bond strength using a high precision universal testing machine. Scanning electron microscope, stereo microscope, atomic force microscope, and energy-dispersive X-ray spectroscopy were used to investigate the structural characteristics of samples at the fracture surface. The collected data were analyzed with a one-way ANOVA and Tukey HSD test (α=.05). IZ-SOD revealed highest CTE and shear bond strength values, while the IA-glass revealed the lowest values than the other groups. There was no significant difference in CTE and bond strength among IZ-SOD, IA-SOD and IZ-glass samples (p>0.05). The experimental SOD zeolite-infiltrated samples revealed higher CTE mismatch and bond strength along with a more favourable mode of failure than did the commercial glass-infiltrated samples. Sandblast technique is considered as effective conditioning procedure for enhancing the surface roughness of SOD zeolite-infiltrated frameworks which subsequently improving the bond strength.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur 50603, Malaysia; Department of Prosthetic Dentistry, College of Dentistry, University of Baghdad, Bab-Almoadham, P.O. Box 1417, Baghdad, Iraq. Electronic address: dr_ghassan74@yahoo.com.
authors.forename: Ghassan Abdul-Hamid
authors.initials: GA
authors.lastname: Naji
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur 50603, Malaysia. Electronic address: anitaomar@um.edu.my.
authors.forename: Ros Anita
authors.initials: RA
authors.lastname: Omar
authors.affiliation: Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia.
authors.forename: Rosiyah
authors.initials: R
authors.lastname: Yahya
mesh_terms: D000537:Aluminum Oxide; D002516:Ceramics; D001840:Dental Bonding; D003776:Dental Porcelain; D017266:Dental Prosthesis; D003799:Dental Stress Analysis; D003801:Dental Veneers; D006801:Humans; D008422:Materials Testing; D033081:Shear Strength; D013499:Surface Properties; D017641:Zeolites / Q000032:analysis*
chemical_list: D003776:Dental Porcelain; D017641:Zeolites; D000537:Aluminum Oxide
keywords: CTE mismatch; In-Ceram Alumina; Shear bond strength; Sodalite zeolite-infiltration; Zirconia-toughened alumina