Predicting porcelain thickness required for dental shade matches.

Area of Science:

• Dental Materials Science
• Ceramic Restorations
• Color Matching in Dentistry

Background:

• Dental restoration shade matching relies heavily on porcelain thickness.
• Clinical shade matches remain difficult despite adequate porcelain thickness.

Purpose of the Study:

• To predict the required dentin porcelain thickness for achieving clinical shade matches (≤3 DeltaE units).
• To evaluate various dental porcelain systems and shades for shade matching accuracy.

Main Methods:

• Evaluated three all-ceramic (Empress, Inceram-Alumina, Inceram-Spinell) and two metal-ceramic (Vintage, VMK-95) systems.
• Fabricated specimens at thicknesses of 1.0, 1.2, 1.5, and 2.0 mm for shades A1, A3, and C2.
• Measured CIE-LAB coordinates of specimens and shade tabs using a colorimeter.

Main Results:

• Seventy percent of color difference was attributed to high L* (Munsell value) in specimens.
• All-ceramic systems showed more shade matches than metal-ceramic systems at thicknesses ≤2.0 mm.
• Higher L* values in specimens contributed significantly to color discrepancies.

Conclusions:

• Semi-translucent all-ceramic systems demonstrated superior clinical shade matches compared to metal-ceramic systems.
• Increasing dentin porcelain thickness from 1.0 to 2.0 mm did not enhance shade matching in semi-translucent systems.
• Material type significantly influences the ability to achieve accurate shade reproduction.