• Jintanaluk Pornchottaweesup D.D.S.
• Suchit Poolthong D.D.S., Grad. Dip. (Operative Dentistry), M.Sc., Ph.D.

Objective The present study compared the erosive effects of acidic drinks on artificial white spot
enamel lesions with or without Icon^® resin infiltration.

Materials and methods Specimens were prepared from 80 extracted human premolars, and randomly
divided into 4 groups to be immersed in one the following of solutions; 1) Cola soft drink, 2) orange
juice, 3) sports drink, or 4) de-ionized water. Each specimen was split along the mesial/distal midline,
generating two equal halves, which were embedded in resin. Each resin block was polished to expose
approximately 1 x 1 mm² of the buccal enamel and immersed in a demineralizing solution to induce
artificial white spot lesions. A specimen resin infiltrated with Icon^® (DMG, Germany), and an uninfiltrated
specimen from the same tooth as control were alternately immersed in the designated solution and
artificial saliva for 10 cycles of five seconds each. The procedure was repeated twice at six-hour
intervals. Subsequently, the volume loss and mean depth of the white spot lesions were measured using
a profilometer. The prepared specimens were treated in the same manner for each solution. Data were
analyzed by two-way ANOVA and one-way ANOVA with Tamhane multiple comparison (p < 0.05).

Results The mean of the volume loss and the mean depth of the white spot enamel lesions were
significantly higher in every group using resin Icon^® and immersed in acidic drinks compared to
control, with the highest value found when samples were exposed to a Cola soft drink. Both mean
volume loss and mean depth were significantly affected by resin Icon^® and types of solution
(p < 0.0001). The interaction between resin Icon^® and types of solution was also significant
(p < 0.0001).

Conclusion Infiltration of artificial white spot enamel lesions with resin Icon^® cannot prevent erosion
when they are exposed to acidic drinks.

(CU Dent J. 2012;35:179-88)