Effect of ceramic type and thickness on the masking ability of chairside machinable all-ceramic crowns

doi:10.7518/hxkq.2024.2023263

Abstract

Abstract:

Objective This study aimed to evaluate the influence of ceramic type and thickness on the masking ability and final aesthetic effects of chairside machinable all-ceramic crowns. Methods Six kinds from three types chairside machinable ceramic materials (IPS e.max CAD HT/MT/LT, IPS Empress LT, and VITA Suprinity HT/T) in shade A2 were fabricated to slice specimens into 1.0, 1.5, and 2.0 mm-thick sections (n=10). The color parameters of the specimens against black and white tiles and four resin substrates (A2, A4, B3, and C4 shade) were measured with a spectrophotometer. The translucency parameter (TP) was calculated using color parameters measured over standard white and black backgrounds. The color differences (ΔE) were calculated between there substrate shades (A4, B3, C4 ) and A2 shade (control group). Two-way analysis of variance (ANOVA) was performed on the TP values. The two va-riables were ceramic type and ceramic thickness. Three-way ANOVA was used to determine the effects of ceramic materials, ceramic thickness, and substrate shades on the ΔE values, followed by Tukey test for multiple comparisons (α=0.05). Results Ceramic type, ceramic thickness, and substrate shade significantly affected the ΔE values (P<0.001). The L* and b* values of the specimens increased with increasing ceramic thickness, except in substrate A2, whereas the ΔE values decreased. The color difference of all 1.0 mm-thick specimens or all specimens over the substrates C4 shade exceeded the clinically acceptable threshold (ΔE>3.3). Conclusion The masking ability of chairside machinable all-ceramic crowns is influenced by ceramic type and thickness, and ceramic material. The thickness of ceramic less than 2.0 mm cannot mask the gray shade abutment.

Key words: chairside machinable ceramic, all-ceramic crown, masking ability, resin background, color diffe-rence

CLC Number:

R783.1

Li Sinuo, Zhang Luyao, Liang Shanshan, Liu Yuqiang, Xing Wenzhong. Effect of ceramic type and thickness on the masking ability of chairside machinable all-ceramic crowns[J]. West China Journal of Stomatology, 2024, 42(1): 56-61.

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References 19

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商品名	材料简称	瓷材料种类	主要成分	厂家
IPS e.max CAD HT型	LD-HT	二硅酸锂基切削陶瓷	57%~80%SiO₂、11%~19%Li₂O，晶粒大小0.2~2.0 μm	义获嘉伟瓦登特
IPS e.max CAD MT型	LD-MT
IPS e.max CAD LT型	LD-LT
IPS Empress CAD LT型	LR-LT	白榴石增强切削陶瓷	60%~65%SiO₂、16%~20%Al₂O₃、10%~14%K₂O，晶粒大小1~5 μm	义获嘉伟瓦登特
VITA Suprinity HT型	ZLS-HT	氧化锆加强型硅酸锂基切削陶瓷	8%~12%ZrO₂、56%~64%SiO₂、15%~21%Li₂O，平均晶体直径0.5 μm	Vita
VITA Suprinity T型	ZLS-T	氧化锆加强型硅酸锂基切削陶瓷	8%~12%ZrO₂、56%~64%SiO₂、15%~21%Li₂O，平均晶体直径0.5 μm	Vita

材料简称	试样厚度			F值	P值
材料简称	1.0 mm	1.5 mm	2.0 mm	F值	P值
LD-HT	39.72（0.63）^aA	33.64（0.64）^aB	28.98（0.91）^aC	536.317	0.000
LD-MT	37.12（1.23）^bA	31.09（1.88）^bB	24.22（0.61）^bC	231.222	0.000
LD-LT	33.29（0.69）^cA	25.37（1.47）^cB	20.48（1.41）^cC	270.828	0.000
LR-LT	36.31（1.07）^bA	29.37（1.62）^bB	22.87（0.91）^dC	294.252	0.000
ZLS-HT	32.54（1.04）^cA	24.58（0.98）^cB	18.82（0.83）^eC	517.253	0.000
ZLS-T	23.50（0.40）^dA	17.32（1.52）^dB	10.56（0.48）^fC	467.573	0.000
F值	402.124	168.840	465.339
P值	0.000	0.000	0.000

材料简称	1.0 mm			1.5 mm			2.0 mm
材料简称	ΔE_A4	ΔE_B3	ΔE_C4	ΔE_A4	ΔE_B3	ΔE_C4	ΔE_A4	ΔE_B3	ΔE_C4
LD-HT	6.85±0.62^a	4.94±0.97^a	12.29±0.42^a	5.86±0.32^a	4.01±0.26^a	10.42±0.31^a	4.78±0.35^a	3.39±0.34^a	8.69±0.32^a
LD-MT	6.63±0.71^ab	4.52±0.58^ab	11.62±0.61^ab	5.41±0.47^ab	3.85±0.40^ab	9.68±0.75^ab	4.08±0.15^b	2.94±0.15^b	7.21±0.33^b
LD-LT	5.96±0.54^b	4.21±0.39^b	10.63±0.76^c	4.56±0.52^c	3.14±0.23^c	7.93±0.84^c	3.29±0.28^c	2.61±0.19^c	6.03±0.40^c
LR-LT	6.56±0.21^ab	4.61±0.19^ab	11.52±0.39^b	5.20±0.27^b	3.77±0.30^b	9.06±0.53^b	4.04±0.24^b	2.98±0.13^b	6.84±0.30^b
ZLS-HT	4.61±0.61^c	4.04±0.46^c	9.26±0.65^d	4.45±0.37^c	3.17±0.24^c	7.61±0.67^c	3.05±0.25^c	2.32±0.37^c	5.36±0.27^d
ZLS-T	4.08±0.30^c	3.42±0.42^c	7.25±0.60^e	2.94±0.47^d	2.54±0.59^d	5.28±0.63^d	2.04±0.41^d	1.84±0.26^d	3.71±0.41^e
F值	36.632	11.828	70.939	38.313	12.551	52.901	102.787	31.413	139.967
P值	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000

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