Document Type


Date of Degree

Spring 2011

Degree Name

MS (Master of Science)

Degree In

Operative Dentistry

First Advisor

Bergeron, Cathia

Second Advisor

Vargas, Marcos A

First Committee Member

Cobb, Deborah S

Second Committee Member

Gratton, David G

Third Committee Member

Qian, Fang

Fourth Committee Member

Geraldeli, Saulo


Objective: To compare the translucency of six different porcelains indicated for veneers, with various shades and opacities.

Methods: 13mm diameter and 0.7mm thickness discs were fabricated for the following porcelains (A1 shade; n=5): Empress Esthetic (EE), e.maxPress (EP), InLine (IL) (Ivoclar Vivadent); VITA PM9 (VPM), Vitablocks MarkII (VMII) (Vita Zahnfabrik); Kavo Everest G-Blank (KEG) (KaVo Dental GmbH) and Lava Zirconia (LZ) (3M ESPE). IL and LZ respectively served as positive and negative controls. Groups with different shades (BL2, BL4, A1, B1), as well as high (HT) and low translucencies (LT), were fabricated for e.maxPress. The luminous reflectance (Y) and color coordinates (CIE L*a*b*) were measured with a colorimeter (CIE illuminant D65, 2-degree observer function) with the specimens placed on black and white backgrounds. Contrast ratios (CR = YB/YW) and translucency parameters (TP= [(LB* - LW*)2 + (aB* - aW*)2 + (bB* - bW*)2 ]1/2) were calculated. One-way ANOVA and post-hoc Tukey's HSD tests were used to analyze the data (α = 0.05).

Results: Statistically significant differences in CR and TP were found among porcelains (P < .0001). The CR means in order of decreasing translucency were: VPM (0.15) > VMII (0.24), IL (0.25), KEG (0.26) > EP HTB1 (0.32), EE (0.34) > EP HTA1 (0.37), EP HTBL4 (0.37) > EP HTBL2 (0.43), EP LTA1 (0.47) > LZ (0.73). The TP means in order of decreasing translucency were: VPM (40.34) > VMII (33.66), KEG (33.52), IL (32.44) > EP HTB1 (27.96), EE (27.64) > EP HTA1 (26.59), EP HTBL4 (26.14) > EP HTBL2 (22.70), EP LTA1 (21.35) > LZ (10.43). Translucency of conventional feldspathic porcelain was comparable to that of machinable feldspathic porcelain. Pressable feldspathic porcelain presented the greatest translucency. Shade and thickness influenced lithium disilicate porcelain translucency.

Conclusion: Various ceramics systems designed for porcelain veneers present various degrees of translucency.


Ceramics, Dental Materials, Translucency Parameters


viii, 82 pages


Includes bibliographical references (pages 77-82).


Copyright 2011 Karine Tenorio Landim Barizon