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    STUDIA CHEMIA - Issue no. 4 / 2014  
         
  Article:   TRANSLUCENCY VARIATION OF LITHIUM DISILICATE CERAMICS WITH CLINICALLY RELEVANT THICKNESSES.

Authors:  . 		 
       
         
  Abstract:   The aim of this study was to investigate the relationship between translucency and thickness of IPS e.max lithium disilicate ceramics (Ivoclar Vivadent). 100 ceramic disks were pressed out in four opacities (high opacity (HO), medium opacity (MO), low translucency (LT) and high translucency (HT) and in five clinically relevant thicknesses (0.3mm, 0.6mm, 0.9mm, 1.2mm, 1.5mm /-0.1mm) (n=5). The CIE L*a*b* colour parameters against black and white backgrounds were recorded with a dental spectrophotometer (VITA Easyshade®, VITA Bad Säckingen, Germany), in D65 light source (JUST LED Color Viewing Light, JUST Normlicht, Weilheim/Teck, Germany) in a dark room. The translucency parameter (TP) was calculated for each sample. The data were statistically processed with a 2-way ANOVA test, followed by the Tuckey Honestly Significant Difference (HSD). Results showed that TP values recorded for ceramic materials with higher opacity (HO, MO) were lower than those for materials with lower opacity (higher translucency) (LT, HT), with a high statistical significance (P<.01). There was an exponential regression curve between thickness and the TP values, with a very good correlation (R2=0,981-0,998). In conclusion, translucency of dental ceramics was significantly influenced by thickness and type of material, with an exponential relationship between TP and thickness.

Keywords: Lithium disilicate, translucency, ceramic thickness
 
         
     
         
         
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