THE COLOR STABILITY OF MULTILAYERED SUPER TRANSLUCENT MONOLITHIC ZIRCONIA (STM-ZR) CEMENTED TO DIFFERENT IMPLANT-ABUTMENT SUBSTRATES AFTER ACCELERATED AGEING IN VITRO

Document Type : Original Article

Authors

1 Biomaterials Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt Champollion Street Azarita

2 Conservative Dentistry Department, Faculty of Dentistry, Alexandria University

3 Dental Biomaterials Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.

Abstract

BACKGROUND: As the color of super translucent monolithic zirconia (stm-Zr) cemented to underlying substrates were not widely studied, the purpose of this study was to investigate the color stability of (stm-Zr) cemented to different implant-abutment substrates after accelerated aging in vitro.
MATERIALS & METHODS: Multilayered CubeX (5mol%Y2O3) was milled in discs (n=24). Each was subdivided into three subgroups cemented to different substrate materials (n=8); titanium grade-V (subgroup-A), IPS e.max ZirCAD-MT (4mol%Y2O3) (subgroup-B), and IPS e.max ZirCAD-LT (3mol%Y2O3) (subgroup-C), to simulate commonly used implant abutment materials. Cemented samples were characterized for their color before and after accelerated aging.
RESULTS: After aging significant decrease in color stability in (subgroup A) compared to the other two subgroups, B and C (p < 0.015) & (p < 0.001).
CONCLUSION: 3Y-TZP zirconia showed a more negligible aging effect with low-temperature degradation compared to the 5Y-TZP.
CLINICAL SIGNIFICANCE: Newly developed stm-Zr were found to have minimal sensitivity to ageing in terms of their color stability. Thus, while the prosthetic treatment plan is established, clinicians need to be more cautious in selecting the abutment substrates when highly translucent esthetic ceramics are used as implant-based restorations, especially at reduced thicknesses.

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Alexandria Dental Journal
Volume 48, Issue 1
B (Endodontics, Prosthodontics, Fixed prosthodontics, Conservative dentistry, Dental Biomaterials)
April 2023
Pages 154-160

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