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

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

Article information

Restor Dent Endod. 2012;37(2):90-95
Publication date (electronic) : 2012 May 18
doi : https://doi.org/10.5395/rde.2012.37.2.90
1Department of Dentistry, Seoul National University School of Dentistry, Seoul, Korea.
2Department of Conservative Dentistry, Seoul National University School of Dentistry, Seoul, Korea.
3Clinic for Persons with Disabilities, Seoul National University Dental Hospital, Seoul, Korea.
Correspondence to Juhea Chang, DDS, MSD, PhD. Clinical assistant professor, Clinic for Persons with Disabilities, Seoul National University Dental Hospital, 101 Daehag-ro, Jongro-gu, Seoul, Korea. TEL, +82-2-2072-3831; FAX, +82-2-2072-2854; juhchang@snu.ac.kr
Received 2011 December 30; Revised 2012 February 24; Accepted 2012 February 24.

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 × 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 (ΔE*) 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.

Notes

No potential conflict of interest relevant to this article was reported.

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Article information Continued

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.

Table 1

The difference in the mean values (SD) of CIE L*, a*, b*, and ΔE* among the control and the experimental groups after caries formation for three different demineralization times and corresponding resin infiltration

Table 1

Different superscript letters denote the values that are significantly different from one another in each column (p < 0.05).

Table 2

The mean values (SD) of Vickers hardness after caries formation for three different demineralization times and corresponding resin infiltration

Table 2

Different superscript letters denote the values that are significantly different from one another in each column (p < 0.05).