| Autor: |
Vichi A; Dental Academy, University of Portsmouth, Portsmouth PO1 2QG, UK., Fabian Fonzar R; Private Practice, Studio Fonzar, 33030 Campoformido, Italy., Carrabba M; Private Practice, Studio Associato, 53100 Siena, Italy., Louca C; Dental Academy, University of Portsmouth, Portsmouth PO1 2QG, UK., Scotti N; Department of Surgical Sciences, Dental School Lingotto, University of Turin, 10126 Turin, Italy., Mazzitelli C; DIBINEM, University of Bologna, 40125 Bologna, Italy., Breschi L; DIBINEM, University of Bologna, 40125 Bologna, Italy., Goracci C; Department of Medical Biotechnologies, University of Siena, 53100 Siena, Italy. |
| Abstrakt: |
This study aimed at evaluating the effects of different surface conditionings on the microshear bond strength (µSBS) of a self-adhesive resin cement to VITA Suprinity (ZLS) and IPS e.max CAD (LD). Three surface conditioning protocols were performed on ZLS and LD before luting with a self-adhesive resin cement (RelyX Unicem 2, RXU): hydrofluoric acid (HF), HF + silane (HF + S), or Monobond Etch & Prime (EP). In each group, 15 cylindrical buildups of RXU were prepared on five milled bars and submitted to a µSBS test. Data were statistically analyzed with two-way ANOVA and Tukey's post hoc test ( p < 0.05). Failure modes were recorded and classified as adhesive, mixed, cohesive in resin, or ceramic, and statistically analyzed with Fisher's exact test ( p = 0.05). One additional bar per group was used for the morphological characterization of the conditioned surface by means of SEM. The material per se did not significantly influence adhesion ( p = 0.744). Conditioning protocol was a significant factor: EP yielded significantly higher μSBS than HF ( p = 0.005), while no significant differences emerged between EP and HF + S ( p = 0.107), or HF + S and HF ( p = 0.387). The material-conditioning protocol interaction was not statistically significant ( p = 0.109). Significant intergroup differences were found in distribution of failure modes: mixed failures were predominant in the ZLS/EP group, while the other groups showed a prevalence of adhesive failures. The self-etching primer showed promising results in terms of immediate bond strength of a self-adhesive resin cement to lithium-silica-based glass ceramics, suggesting its alternative use to hydrofluoric acid and silane conditioning protocols. |
