Document Type : Original Article
Authors
- Hossein Chalakinia 1
- Farideh Darabi 2
- Yasaman Sadeghi 2
- Reza Tayefe Davalloo 2
- Seyedeh Maryam Tavangar 2
- Aidin Sooratgar 3
1 Dept. of Restorative Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
2 Dept. of Restorative Dentistry, Dental School, Guilan University of Medical Science, Guilan, Iran.
3 Dept. of Endodontics, Dental school, Tehran University of Medical Science, Tehran, Iran.
Abstract
Statement of the Problem: A few studies have examined the masking ability of the combined application of opaquer and resin composites on tooth discoloration.
Purpose: This study investigated combining two types and thicknesses of composites with two opaquers to mask discolored backgrounds.
Materials and Method: In this in vitro research, we used two composite resins, Vitalescence (Ultradent) and Gradia Direct (GC), and two opaquers: Pink opaque (Cosmedent) and Creative Color A2 (Cosmedent). Seventy-two specimens were made as disks in 8 groups (n=9), with 1.0 mm and 0.5 mm thicknesses. One surface of each disk was coated by one of the opaquers and cured. The 4 mm-thick composite disks from both composite brands were also made as a reference, representing the inherent color of the material. Then, the composite disks from the opaquer-coated surface were placed on a C4 porcelain disk as a background to simulate a discolored tooth. Color measurement for all specimens was performed using a spectrophotometer device. The color difference of each test group and 4 mm thick disks of the same composite were measured using the formula CIELAB (ΔE * ab). Statistical analysis was performed by using ANOVA and Tukey's Post hoc tests.
Results: Statistically significant differences were observed between the eight groups (p= 0.001). The thickness, composites, and opaquer variants significantly affected the ΔE*. The samples with 1mm thickness, the Vitalescence composite, and the Creative Color opaquer A2, had significantly lower ΔE* than the 0.5-mm samples, the Gradia composite, and the Pink opaquer, respectively. The number of samples with desirable ΔE was significantly higher in the Vitalescence composite group than in the Gradia composite, and the Creative Color A2 opaquer had significantly more desirable ΔE than the Pink opaquer.
Conclusion: Most results that achieved acceptable masking ability were obtained with combinations of Creative Color opaquer A2+ Vitalescence / Gradia composite in 0.5 or 1mm thicknesses.
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