Objectives: The purpose of this study was to ascertain the effect of a new sealer, Pro Seal (Reliance Orthodontic Products), on the bond strength of an orthodontic resin cement bonded to enamel exposed to a cariogenic solution. Methods: Non-carious, extracted human third molars stored less than three months in 0.25% sodium azide solution were sectioned into buccal and lingual halves and mounted in acrylic. Specimens were pumiced and air dried for five seconds and then etched and sealed with ProSeal. Primer was then applied, and an orthodontic resin cement was bonded using an inverted cone mold (3-mm base, 4-mm height). Twenty specimens were stored for 14 days in a Ten Cate cariogenic solution (pH 3.5) at 37°C. Ten specimens were prepared the same way and stored in water (control). Specimens were then debonded using an Instron machine at a crosshead speed of 0.5 mm/min. Data were analyzed by one-way analysis of variance and a Scheffe interval at the 0.05 level of significance to compare the bond strength of the cariogenically challenged teeth to the control group. After debonding, the Adhesive Remnant Index (ARI) at the bond site was recorded. Results: The bond strength for the Ten Cate group was 18 (7) MPa, whereas the bond strength for the control group was 24 (4) MPa. ANOVA indicated that the two groups were significantly different (p= 0.04). Although some degradation of bond strength occurred, the bond strength for the cariogenically challenged teeth was well above what is needed clinically for orthodontic bonding. Conclusion: The bond strength of the specimens sealed with Pro Seal and stored in Ten Cate cariogenic solution was 25% lower than the bond strength of sealed specimens stored in water.

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