Abstract
Objectives This is an in vitro study that aimed to evaluate the ability of different glass ionomer restorations
to mask the discoloration produced following silver diamine fluoride (SDF) only and
after potassium iodide (KI) application.
Materials and Methods Thirty-six extracted human adult posterior teeth were collected. Box-shaped cavities
(4 × 2 × 2 mm3 ) were prepared along the cementoenamel junction. Specimens were randomly divided
into two major groups according to the materials applied under the restorations group
(A) 38% silver diamine fluoride (SDF) followed by immediate application of potassium
iodide (KI), group (B) 38% silver diamine fluoride (SDF) only. Each group was further
subdivided according to the restorative material applied as follows (n = 6): subgroup (I) zirconia reinforced glass ionomer, subgroup (II) resin-modified
glass ionomer restoration, and subgroup (III) high viscous glass ionomer restoration.
Color assessment of all specimens was performed using a reflective spectrophotometer.
Specimens' color was assessed color of normal dentin then assessed immediately after
application of SDF (group A) and after application SDF + KI (group B) with the respective
restorative material used.
Statistical Analysis Data showed parametric distribution and variance homogeneity and were analyzed using
one-way analysis of variance followed by Tukey's post hoc test.
Results Intergroup comparisons showed that for SDF and SDF + KI samples, there was a significant
difference between the different restorative materials (p < 0.001). For glass ionomer, SDF samples had significantly higher color change value
than SDF + KI (p < 0.001), while for RMGI and zirconia reinforced glass ionomer, SDF + KI samples
had significantly higher value (p < 0.001) although zirconia reinforced glass ionomer showed the least color change
following SDF (6.00 ± 2.74).
Conclusion Within the limitations of this study, we could conclude that using zirconia reinforced
glass ionomer could have a good masking effect on discoloration produced by SDF. While
the resin-modified glass ionomer restoration showed more discoloration and darkening
effect even after using of KI. Also, using KI in combination with SDF had a good masking
effect on discoloration that produced by SDF.
Keywords laboratory research - potassium iodide - silver diamine fluoride - resin-modified
glass ionomer - zirconia reinforced glass ionomer
