• Suparit Chantchaimongkol D.D.S.
• Sirivimol Srisawasdi D.D.S., M.S., Ph.D.

Objective To evaluate the effect of pretreatment and aging process, by means of water storage,
on microtensile bond strength (μTBS) of a self-adhesive resin composite to dentin.

Materials and methods 72 extracted human molars were selected. μTBS was evaluated using
mid-coronal dentin. According to pretreatment methods, type of materials and water storage time,
teeth were randomly divided into 4 groups: control group: dentin pretreatment with Single Bond^TM
Universal followed by FiltekTM Z350 XT Flowable; group without pretreatment followed by
Vertise^® FlowTM.group with pretreatment with 37.5% phosphoric acid followed by Vertise^® Flow^TM;
and group with pretreatment with 37.5% phosphoric acid and Optibond^® Solo PlusTM followed
by Vertise^® FlowTM. Each group was further randomly divided into 2 subgroups, total of 8 groups to
be tested for 24 hours or 3 months. The specimens were tested for μTBS after water storage, and
failure modes were recorded. Data were analyzed using two-way ANOVA and Bonferroni post hoc
test (p = 0.05).

Results The μTBS revealed the highest in group of dentin pretreatment with 37.5% phosphoric acid
and Optibond^® Solo PlusTM followed by Vertise^® Flow^TM at 24 hours (42.63 ± 4.57 MPa) and the
lowest in group without pretreatment followed by Vertise^® Flow^TM at 3 months (23.39 ± 3.88 MPa).
Considering the effect of pretreatment, groups with pretreatment showed significantly higher μTBS
than groups without pretreatment. In terms of influence of aging process, μTBS were significantly
decreased by water storage.

Conclusion Dentin pretreatment and water storage had effect on μTBS of self-adhesive resin
composite to dentin.

(CU Dent J. 2015;38:21-34)