Effectiveness and Color Stability of Resin Infiltration on Demineralized and Hypomineralized (MIH) Enamel in Children: Six-month Results of a Prospective Trial.

INTRODUCTION: To evaluate the masking effect and color stability of resin infiltration treatment in demineralized (white spot lesion) and hypomineralized (molar incisor hypomineralization) enamel lesions of young permanent anterior teeth. METHODS: Eighty-four (84) anterior teeth with molar incisor hypomineralization or white spot lesions were treated with resin infiltration. The CIE L*a*b* values of sound enamel and enamel lesions were assessed with spectrophotometer and digital image analysis at baseline, immediate postop, 1 week and 6 months. The difference in ΔL, Δa, Δb, and ΔE measurements between sound enamel and the enamel lesions was compared using the repeated analysis of variance (ANOVA) test at p < 0.05. RESULTS: The enamel lesions were clearly discernible from the sound adjacent enamel at baseline. After resin infiltration, there was a significant drop in ΔE values of sound enamel and enamel lesions compared to baseline, and this difference did not change for 6 months, indicating a durable masking effect. At baseline and after 6 months, there was no significant difference in the ΔE values of the test groups. CONCLUSION: The demineralized and hypomineralized enamel defects were effectively masked by resin infiltration, which remained clinically stable for 6 months.

Colour stability of low fusing porcelains: an in vitro study.

Developing porcelain manufacturing technology provides lower fusing porcelains to avoid thermal stresses in metal substructure, particularly for titanium and gold alloys. So far, aesthetic properties of low fusing ceramics have not been well documented. The purpose of this study was, therefore, to estimate the long-term colour stability of low fusing ceramics by using an accelerated aging procedure. Four different ceramics (Vita Omega 900, Vita Titankeramik, Ceramco Finesse, Ceramco II) were used. Porcelain samples 11 +/- 0.5 mm in diameter and 1.4 +/- 0.2 mm in thickness were prepared in three commonly used shades to provide 10 samples of each group. The samples were fired in accordance with the recommendations of the manufacturers. CIE Lab readings were recorded with a spectrophotometer prior to experiments and after a 100 h accelerated aging. The results revealed that only Ceramco Finesse porcelain had a colour change (DeltaE > 1) that is noticeable by human eye. When the shades of porcelains were compared, C3 had greater colour change compared with A3 and B3 shades (P < 0.05).