Effect of CAD/CAM Ceramic Thickness on Shade Masking Ability of Discolored Teeth: In Vitro Study

Abstract

Shade matching is a common challenge that dentists face during fabrication of esthetic dental restoration. Thus, the aim of the current study was to assess the masking ability of two types of CAD/CAM ceramics for gaining high esthetic prosthesis. This in vitro study used a total sample size of 66 lithium disilicate (LD) and leucite reinforced (LR) CAD/CAM ceramics sub-grouped into three thicknesses: 0.5, 1, and 1.5 mm. Nine shades of natural dentin die materials were prepared as a replica of the underlying tooth structure. The difference in color (ΔE) and translucency parameter (TP) were assessed for both tested ceramics at the three thicknesses. One-way ANOVA was performed to compare the three thicknesses of each ceramic, followed by multiple pairwise comparisons between both ceramics. LR had significantly higher ΔE than LD at all thicknesses used unlike the case in TP. Thickness of 0.5 mm exhibited the highest ΔE and TP, while 1.5 mm thickness showed the lowest ΔE and TP in both ceramics. Increase in ceramic thickness had a great impact on both color masking ability of the underlying tooth structure and its translucency. The higher the ceramic thickness, the better the masking ability and the lower the translucency was reported.

Influences of Different CAD/CAM Ceramic Compositions and Thicknesses on the Mechanical Properties of Ceramic Restorations: An In Vitro Study

“…Therefore, this finding supports the benefit of limiting the use of a 0.5 mm ceramic thickness in the fabrication of dental veneers for esthetic purposes only, while the use of a 1 mm thickness can be extended to the fabrication of inlays and onlays. The 1.5 mm thickness can be considered the optimum thickness for the fabrication of full-coverage restorations subjected to heavy masticatory loads [ 12 , 31 ].…”

“…Among the available CAD/CAM ceramics, lithium disilicate (LD), leucite-reinforced (LE) glass ceramics, and zirconia have proven to be the most favorable ceramic materials used in the oral cavity [ 8 , 9 , 10 ]. LD ceramic is considered the material of choice for the fabrication of posterior and anterior restorations because of its superior mechanical and esthetic properties [ 11 , 12 ]. Previous studies reported that LD ceramics showed comparable 5-year survival rates to those of zirconia when used for the fabrication of posterior crowns and fixed partial dentures [ 13 , 14 ].…”

“…Another factor to be considered in the fabrication of definitive restorations is the minimum ceramic thickness that can enable conservative tooth preparation, maintain pulp vitality, and provide the retention and resistance of the final restoration [ 30 ]. A ceramic thickness in the range of 0.5–1 mm can be used for the fabrication of veneers [ 30 ], while a thickness of at least 1.5 mm has shown to be appropriate for the fabrication of full-coverage CAD/CAM ceramic restorations [ 12 , 31 ]. Previous studies demonstrated an acceptable fracture resistance of monolithic zirconia crowns with a 0.5 mm thickness fabricated on the posterior molars [ 32 , 33 ].…”

Monolitikus cirkónium-dioxid fogpótlások anyagának spektrofotometriai vizsgálata

“…Az évek múlásával a dentin színe egyre inkább a sötétebb sárgás, illetve szürkés árnyalatok irányába tolódik el a szekunder dentin képződése és a zománcréteg elvékonyodása miatt [18]. A kerámia rétegvastagsága is befolyásolja a végleges restaurátum színét: a vastagabb kerámiaréteg jobb fedőképességgel rendelkezik [5,8,9]. A fogzománc optikai tulajdonságainak fontos eleme a transzlucencia, amely reprodukálására a korszerű fogászati kerámiaanyagok alkalmasak [16,21].…”

Masking Ability of Monolithic and Layered Zirconia Crowns on Discolored Substrates

“…Several recent studies evaluated the masking ability and shade reproduction of dental materials [ 26 , 27 , 28 , 29 , 30 ]. The studies investigated the properties of monolithic samples when placed over discolored substrates.…”