Long-term follow-up of camouflage effects following resin infiltration of post orthodontic white-spot lesions in vivo

Abstract

Objectives: To reassess the long-term camouflage effects of resin infiltration (Icon, DMG, Hamburg, Germany) of white spot lesions (WSL) and sound adjacent enamel (SAE) achieved in a previous trial. The null hypothesis was tested that there were no significantly different CIE-L*a*b*-ΔE-values between WSL and SAE areas of assessment after at least 24 months (T24) compared to those at baseline (T0). Materials and Methods: Of twenty subjects who received previous resin infiltration treatment of nteeth = 111 nonrestored, noncavitated postorthodontic WSL after multibracket treatment during a randomized controlled trial and were contacted 20 months after baseline, eight subjects (trial teeth nteeth = 40; m/f ratio 1/7; age range (mean; SD) 12–17 [15.25; 2.12] years); response rate: 40%) were available for follow-up after at least 24 months (T24). CIE-L*a*b* differences between summarized color and lightness values (ΔEWSL/SAE) of WSL and SAE were assessed using a spectrophotometer and compared to baseline data assessed prior to infiltration (T0), and those after 6 (T6), and 12 (T12) months using paired t tests at a significance level of α = 5%. Results: T24 assessments were performed after a mean 33.86 (SD: 8.64; Min: 24; Max: 45) months following T0. Mean (SD) ΔEWSL/SAE units of available teeth were 8.76 (5.33) at baseline; 5.5 (2.75) at T6; 5.2 (2.41) at T12; and 5.57 (2.6) at T24. Comparisons of T6, T12, and T24 with T0 yielded highly significant differences, whereas T6–T24 and T12–T24 differences were found to be not significant. Conclusions: Assimilation of infiltrated WSL to the color of adjacent enamel by resin infiltration is considered to be suitable for the long-term improvement in the esthetic appearance of postorthodontic WSL.

Color evaluation of white spot lesions treated with resin infiltration after water or grape juice storage

“…Resin infiltration was shown to reliably mask artificial caries lesions in vitro, following the trend of a previous studies 7,35 . Within the limitation of this in vitro experiment, the results obtained from the present study could be of clinical relevance.…”

“…Previous studies have demonstrated that such parameters are enough to evaluate white spot lesions, since these lesions are more opaque and whiter than healthy enamel. Although some studies use CIEDE2000 system (ΔE 00 ) to assess color measurements, the CIE-Lab system is still a reliable system used and has been used in recent studies to evaluate color stability of white spot lesions 7,26 .Based on this CIE-Lab system, it is possible to calculate the ΔE ab and compare it with a visual perception already reported in the literature (color variation is imperceptible when <1, clinically acceptable when ≤3.3 and unacceptable when above 3.3) 22 . In the present study, color coordinates were obtained at several time intervals as described in the materials and methods section.…”

“…In addition, the introduction of resinous materials to seal pits and grooves and to infiltrate white spot lesions brought the advantage of being an immediate treatment. However, studies with infiltrant in anterior teeth have questionable esthetic in masking white spot lesions in the long-term [5][6][7] .…”

In vitro and in vivo assessment of enamel colour stability in teeth treated with low-viscosity resin infiltration – a literature review

“…In addition, according to the authors, these values were so low that they were not visible to the naked eye in clinical conditions. The camouflage effect did not change over the entire observation period [20].…”

“…The longest observation so far was conducted by Knösel et al on a group of 20 patients with demineralisation changes of enamel after permanent treatment with an orthodontic appliance [20]. Spectrophotometer testing showed colour stability of the treated surfaces for up to 24-45 months.…”