The comparative evaluation of the color stability of two ceramic systems with varying thickness and frequency of firing: an invitro study.
Journal Title: International Journal of Dental Science and Innovative Research (IJDSIR) - Year 2019, Vol 2, Issue 3
Abstract
Introduction : Color matching between ceramic restorations has become a major challenge in dentistry. Usually completed restorations do not match the shade guide , as esthetics of many ceramics gets affected by translucency . Ceramic translucency can be affected by many factors , including thickness , microstructures and the number of firing cycles. Failure in achieving appropriate shade of theprosthesis may result in great esthetic inconvenience for both the patient as well as the clinician. Aim : To evaluate the color stability of two Ceramic systems Aluminium oxide and Zirconium oxide and to study the effect of ceramic thickness (0.5mm , 1mm , 1.5mm ) and number of firings (3,5,7) on the color stability of Aluminium oxide and Zirconium oxide Ceramic systems. Materials and methods: 21 disc shaped specimens 10mm in diameter and 0.6mm core thickness are made from Aluminium oxide Ceramic systems as well as Zirconium oxide ( 4mm diameter and 10mm core thickness). These two Ceramic systems are divided into 3 groups (n=7) veneering with dentin ceramic thicknesses as 0.5,1,1.5mm . Repeated firing (3,5,7) are performed and color of the specimens is compared with the color after the initial firing. Color differences among Ceramic specimens are measured using a spectrophotometer (SpectroshadeTM micro-MHT s.p.a) and data expressed in CIE lab system coordinates.Results: Increase in Ceramic thickness resulted reduction in L* values and increase in a* and b* values for both Aluminium oxide and Zirconium oxide. Increase in number of firings resulted decrease in L* values making the specimen darker. Increase in a* and b* values making the specimens redder and yellower in Chroma. Discussion: This invitro study measured the color changes of ceramic specimens prepared at different thicknesses (0.5, 1, 1.5mm) and fired at 3, 5, 7 times. The results of this study support the hypothesis that color differences would be noted relative to firing times and dentin ceramic thicknesses. There were significant differences in color changes within groups. In the current study, the specimens had ceramic thicknesses of 0.5, 1, or 1.5 mm, with a core thickness of 0.6 mm for Aluminium oxide and 1mm for Zirconium oxide.Conclusion: Lab values of Aluminium oxide and Zirconium oxide were affected by number of firings and Ceramic thicknesses . Lab values of Aluminium oxide and Zirconium oxide were affected by number of firings and Ceramic thicknesses.
Authors and Affiliations
Dr. Keerthi Palagiri
Keywords
Related Articles
- EP ID EP596970
- DOI -
- Views 76
- Downloads 0
Expression of Human Papilloma Virus in Oral Sub mucous Fibrosis Patients- A PCR Based Assay Study.
Oral submucous fibrosis is a chronic disease of oral mucosa characterized by inflammation and progressive fibrosis of the lamina propria and deeper connective tissues, followed by stiffening of oral mucosa resulting in d...
Apexification – Apex Fixed Then And Now: Review of Case.
Apexification is a technique to generate a calcific barrier in a root with an open apex or the sustained apical development of an incomplete root in teeth with necrotic pulp. In contrast, apexogenesis describes the conti...
Radiographic Profile of Symptomatic Impacted Mandibular Third Molars in the Arab Israeli Population.
Introduction: Impaction may be defined as the failure of complete eruption into a normal functional position of one tooth within normal time due to lack of space in the dental arch, caused by obstruction by another tooth...
Role of Gingival Biotype on Implant Esthetics -An Observational Study
Implant dentistry has seen enormous innovations made to achieve primary implant stability and improve bone-to-implant contact. The focus has now shifted towards creating an esthetic restoration that is indistinguishable...
Chronic Suppurative Osteomyelitis in Anterior Maxilla: A Rare Variety.
Osteomyelitis is an inflammatory disease of infectious origin. Progressive destruction of bone and sequestra formation are hallmark of osteomyelitis. Due to extensive vascular supply of maxilla it is less prone to infect...