Restor Dent Endod.  2012 May;37(2):90-95.

Color and hardness changes in artificial white spot lesions after resin infiltration

• Kim JH
• Son HH
• Chang J

Abstract

OBJECTIVES
The purpose of this study was to determine the effect of resin infiltration technique on color and surface hardness of white spot lesion (WSL) with various degrees of demineralization.
MATERIALS AND METHODS
Ten human upper premolars were cut and divided into quarters with a 3 x 4 mm window on the enamel surface. Each specimens were separated into four groups (n = 10) and immersed in demineralization solution to create WSL: control, no treatment (baseline); 12 h, 12 hr demineralization; 24 h, 24 hr demineralization; 48 h, 48 hr demineralization. Resin infiltration was performed to the specimens using Icon (DMG). CIEL*a*b* color parameters of the enamel-dentin complex were determined using a spectroradiometer at baseline, after caries formation and after resin infiltration. Surface hardness was measured by Vickers Micro Hardness Tester (Shimadzu, HMV-2). The differences in color and hardness among the groups were analyzed with ANOVA followed by Tukey test.
RESULTS
Resin infiltration induced color changes and increased the hardness of demineralized enamel. After resin infiltration, there was no difference in color change (DeltaE*) or microhardness among the groups (p < 0.05).
CONCLUSION
There was no difference in the effect of resin infiltration on color and hardness among groups with different extents of demineralization.

Keyword

Color measurement; Microhardness; Resin infiltration; White spot lesion

MeSH Terms

Bicuspid
Dental Caries
Dental Enamel
Hardness
Hardness Tests
Humans
Nitriles
Pyrethrins
Nitriles
Pyrethrins

Figure

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  Figure 1 (a) Mean values of CIE L* for three groups (12 h, 24 h, and 48 h demineralization time) measured at baseline, after careis formation, and after resin infiltration; (b) Mean values of CIE a* for three groups; (c) Mean values of CIE b* for three groups; (d) Mean values of color change (CIE ΔE*) after caries formation (BL-CA) and after resin infiltration (BL-RI) for three groups.

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