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The Journal of Adhesive Dentistry
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J Adhes Dent 20 (2018), No. 6     28. Dec. 2018
J Adhes Dent 20 (2018), No. 6  (28.12.2018)

Page 535-540, doi:10.3290/j.jad.a41629, PubMed:30564800


Effects of Lithium and Phosphorus on the Efficacy of a Liner for Increasing the Shear Bond Strength Between Lithium Disilicate and Zirconia
Lee, Young-Hoon / Park, Chan-Jin / Cho, Lee-Ra / Ko, Kyung-Ho / Huh, Yoon-Hyuk
Purpose: To evaluate the effect of the chemical formulation of liners on the shear bond strength (SBS) between lithium disilicate veneering ceramic and zirconia core.
Materials and Methods: Four experimental groups (n = 12) were designed according to liner composition: negative control group (lithium and phosphorus removed from the conventional liner), Li group (lithium added to the negative control group), P group (phosphorus added to the negative control group), and Li+P group as the positive control (conventional liner). After applying the liner, lithium disilicate was pressed on zirconia. Specimens were stored in distilled water (37°C, 24 h) before testing the SBS. To test the SBS, shear force was applied perpendicular to the lithium disilicate-zirconia interface. The differences in the SBS between the veneer lithium disilicate and zirconia substructure were evaluated with one-way ANOVA (significance level of 0.05).
Results: The presence or absence of lithium and phosphorus influenced the efficacy of the liner. The negative control and P groups showed mainly cohesive failures, and the Li group mainly showed mixed failures. Both adhesive and mixed failures were observed in the Li+P group. The groups including lithium showed significantly higher SBS than the negative control or Li+P group (p < 0.05). The group including phosphorus, which showed higher crystallinity, showed significantly lower SBS than the negative control and Li+P groups (p < 0.05).
Conclusions: The differences in the composition of the liner can affect the wettability and reactivity, and as a result, the SBS was different.

Keywords: zirconia, lithium disilicate, liner, shear bond strength, liner composition