Journal List > J Korean Acad Conserv Dent > v.30(4) > 1056170

Cho and Kim: Microshear bond strength of adhesives according to the direction of enamel rods

Abstract

This study compared the microshear bond strength (µSBS) to end and side of enamel rod bonded by four adhesives including two total etch adhesives and two self-etch adhesives.
Crown segments of extracted human molars were cut mesiodistally. The outer buccal or lingual surface was used as specimens cutting the ends of enamel rods, and inner slabs used as specimens cutting the sides of enamel rods.
They were assigned to four groups by used adhesives: Group 1 (All-Bond 2), Group 2 (Single Bond), Group 3 (Tyrian SPE/One-Step Plus), Group 4 (Adper Prompt L-Pop). After each adhesive was applied to enamel surface, three composite cylinders were adhered to it of each specimen using Tygon tube. After storage in distilled water for 24 hours, the bonded specimens were subjected to µSBS testing with a crosshead speed of 1 mm/minute. The results of this study were as follows;
1. The µSBS of Group 2 (16.50 ± 2.31 MPa) and Group 4 (15.83 ± 2.33 MPa) to the end of enamel prism was significantly higher than that of Group 1 (11.93 ± 2.25 MPa) and Group 3 (11.97 ± 2.05 MPa) (p < 0.05).
2. The µSBS of Group 2 (13.43 ± 2.93 MPa) to the side of enamel prism was significantly higher than that of Group 1 (8.64 ± 1.53 MPa), Group 3 (9.69 ± 1.80 MPa), and Group 4 (10.56 ± 1.75 MPa) (p < 0.05).
3. The mean µSBS to the end of enamel rod was significantly higher than that to the side of enamel rod in all group (p < 0.05).

Figures and Tables

Figure 1
Specimens; end of enamel rod (left) and side of enamel rod (right).
jkacd-30-344-g001
Figure 2
Specimen adhered to the shear testing apparatus.
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Table 1
Gloup classification by adhesives and composites
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Table 2
Mean microshear bond strength to end of enamel rod (Unit: MPa, Mean ± S.D.)
jkacd-30-344-i002

Group 1: All-Bond 2, Group 2: Single Bond, Group 3: Tyrian SPE/One-Step Plus, Group 4: Adper Prompt L-Pop Superscripts of the other letter indicate values of statistically significant difference by Tukey test (p < 0.05).

Table 3
Mean microshear bond strength to side of enamel rod (Unit: MPa, Mean ± S.D.)
jkacd-30-344-i003

Group 1: All-Bond 2, Group 2: Single Bond, Group 3: Tyrian SPE/One-Step Plus, Group 4: Adper Prompt L-Pop

Superscripts of the other letter indicate values of statistically significant difference by Tukey test (p < 0.05).

Table 4
Statistical comparison between µSBS to end and side of enamel rods in each group by t-test
jkacd-30-344-i004

Group 1: All-Bond 2, Group 2: Single Bond, Group 3: Tyrian SPE/One-Step Plus, Group 4: Adper Prompt L-Pop, *: statistical signigicant difference

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