Akademik Veri Yönetim Sistemi
Restoratif Dişhekimliği Derneği 23.Uluslararası Bilimsel Kongresi, Antalya, Türkiye, 6 - 08 Aralık 2019, ss.37
AIM: The aim of this study is to evaluate the effect of different surface treatments on microtensile
bond strength between dentin and resin cements.
MATERIALS & METHODS: Sixteen caries-free human molars were extracted and the teeth were
removed from all residues and stored in chloramine T solution until treated. The teeth were
sectioned horizontally at the mid-coronal level of crown to obtain flat sound dentin surfaces
by using water-cooled low-speed diamond saw. Each dentin surface was ground with 600-grit
silicon carbide abrasive paper to produce a standard smear layer. In this study, three different resin
cements were used; two dual-cured self-adhesive cement 3M Rely X U 200 and G-CEM LinkAce
also 1 light-cured adhesive cement G-CEM Veneer. According to surface treatment, 8 sub-groups
were obtained. Sub-groups were determined according to the procedures applied on the dentine
surface before the resin cement as follows; Group 1: 3M-Rely X-U 200 as self-adhesive, Group 2:
35% Phosphoric acid followed by universal adhesive (GC G-Premio bond) followed by 3M Rely
X U 200, Group 3: Universal adhesive(GC G-Premio bond) followed by 3M RelyX U 200, Group 4:
G-CEM LinkAce as self-adhesive, Group 5: 35% Phosphoric acid followed by universal adhesive
(GC G-Premio bond) followed by G-CEM LinkAce, Group 6: Universal adhesive (GC G-Premio
bond) followed by G-CEM LinkAce, Group 7: 35% Phosphoric acid followed by universal adhesive
(GC G-Premio bond) followed by G-CEM Veneer, Group 8: Universal adhesive (GC G-Premio
bond) followed by G-CEM Veneer. Resin cement samples were prepared by polymerizing 4 x
4 x 4 mm size silicone molds for each 2 mm thickness using an LED curing unit (Valo Ultradent)
according to the manufacturer’s instructions. Then, dentin-resin cement sticks with a surface area
of approximately 1 x 1 mm were obtained from all specimens using a low-speed diamond saw. For
each subgroup, 10 sticks were obtained. The resulting dentin-resin cement sticks were subjected
to micro-tensile testing with a micro-tensile tester (Bisco microtensile tester). Debonded values
of each sample, measurements made using digital calipers were recorded and the data obtained
were analyzed by one-way ANOVA and Tukey HSD tests (p <0.05).In addition, failure types of the
debonded specimens were classified as adhesive, mixed or cohesive.
RESULTS: The highest bond strength value in the groups showed the 3M RelyX U200 group (2nd
group) applied after acid-etching (34.14 MPa) (p <0.05). Universal adhesive with GC G-CEM Linkace
group (31.92 MPa) and universal adhesive with 3M RelyX U200 group (31.03 MPa) showed similar
values. (P> 0.05). The lowest bond strenght values in the groups showed the with 3M RelyX U200
(15.34 MPa) and GC G-Cem Linkace (14.39 MPa) groups which were applied as self-adhesive, and
GC G-Cem Veneer (17.27 MPa) groups used with universal adhesive after acid etching (p <0.05).
CONCLUSION: Within the limits of this study, it was found that the acid etching of the dentin
surface before applying self-adhesive resin cement and then using universal adhesive increased
the bonding strength of resin cement to dentin. For the light-cured resin cement used in the
study, it may be suggested to prepare the dentin surface by self-etch procedure in order to
increase the bond strength.
Keywords: dentin, resin cement, mictotensile bond strength