Incorporation of Natural Pigments with Acrylic Denture Base Material

Methods:

1022 samples were prepared of Vertex™ clear and pink heat cure acrylic resin, and divided according to additives and 68 concentrations into 3 groups: control, acrylic resin with natural pigments, and acrylic resin with synthetic Vertex™ acrylic stain additives.

          Coloring measurements, indentation hardness, volumetric changes, water sorption and solubility, residual monomer concentration, FTIR, and microscopic texture properties were tested.

The color of all prepared samples was correlated with the Vertex™ gingival shade guide, and gingival color of 24 healthy young participants selected from the Teaching hospital of College of Dentistry by using Vita Easyshade device. Statistical analysis was done by SPSS program, and a special designed program prepared for this study in Mat lab program 2010.

Results:

Color property showed that some samples with natural pigments matched the color of patient's gingiva, with synthetic stains, and gingival shade guides that (ΔE) between them is ≤ 6.8.

Properties showed significant differences at (P<0.05) between control group and groups with both natural pigments and synthetic™ stain. FTIR showed homogenous distribution, which will improve the mechanical properties of HCAR.

Conclusions: Mechanical and physical properties were within the range ADA specification No.12, (2002). Natural pigments (Vanilla 10% or Amaranth 0.1%) instead of the synthetic Vertex™ acrylic stains are clinically acceptable in relation to patients' attached gingiva and gingival Vertex™ shade guide.