Assessment of Capability of Lithium Disilicate Glass Ceramics to Reproduce the A2 Shade and to Mask A4 Substrates


  • Samarla Aruna Kumari
  • Averneni Prema Latha Prema Latha
  • Naveen Reddy
  • Rohit Sharma
  • Mahesh Melkundi
  • Deepa Babji



Ceramics, discoloration, shade


Aim: Capability of lithium disilicate glass ceramics to reproduce the A2 shade and to mask A4 substrates.
Materials and Method: 32 lithium disilicate ceramic specimens were classified materials into 8 groups
of 4 each. Group I- III high translucency (HT) monolayer discs, group IV- VI had low translucency (LT)
monolayer discs, group VII- VIII had medium translucency (MO) bilayer discs. A2 shade tab shade guide
(VITA classical A1-D4) was used for CIE L*a*b* measurements of control. Color differences using thresholds
was as follows: for imperceptible (?E < 1.0), perceptible (1.0 < ?E < 3.3), and clinically unacceptable (?E
> 3.3) differences.
Results: ?E in group IV exhibited highest (9.92±0.21) and group III lowest (8.08± 0.25) value. When the
complex was compared to the A4 substrate, significant difference among all groups (p < 0.05) was found.
?E values when the complex was compared to the A2 shade tab, group III exhibited highest (4.82±0.16)
and group V lowest (0.72±0.06) value. In groups I specimens had acceptable differences, group II had
perceptible differences, group III had perceptible differences, group IV had acceptable differences, group V
had imperceptible differences, group VI and VII had acceptable differences and group VIII had imperceptible
Conclusion: Authors suggested to use LT ceramics with less thickness in the range of 0.5 mm- 0.7 mm to
mask discoloration.

Author Biographies

Samarla Aruna Kumari

Assistant Professor, Department of Prosthodontics, Government Dental College, RIMS, Kadapa, Andhra Pradesh,India

Averneni Prema Latha Prema Latha

Assistant Professor, Department of Prosthodontics, Government Dental College and Hospital, Kadapa,
Andrapradesh, India

Naveen Reddy

Assistant Professor, department of Prosthodontics, College of dentistry, Jazan University,
Saudi Arabia

Rohit Sharma

Assistant Professor, Department of Prosthodontics, NIMS Dental College, Jaipur, Rajasthan, India

Mahesh Melkundi

Professor, Department of Oral Pathology, College of Dental Sciences, Indore, Madhya Pradesh, India

Deepa Babji

Reader,Department of Oral Pathology, Maratha Mandal NG Halgekar Institute of Dental Sciences and research centre,Belgaum, Karnataka, India



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