IADR Abstract Archives
Influence of a novel self-priming etchant on bond-strength to glass-ceramics
Objectives: Evaluating the influence of a novel self-priming ceramic etchant (Monobond Etch, MBEP) on micro-tensile bond strength (MTBS) to leucite reinforced (IPS Empress CAD) and lithium-disilicate reinforced (IPS e.max CAD) glass-ceramic CAD/CAM blocks.
Methods: CAD/CAM blocks were cut to 6 mm thick samples. Surface treatment for IPS Empress CAD groups was: 1. no HF acid, no silane; 2. 60 s HF acid, no silane; 3. 60 s HF acid, silane; 4. MBEP applied for 20 s and left for 40 s; 5. MBEP applied for 20 s and left for 100 s. IPS e.max CAD samples were treated: 6. 20 s HF, silane; 7. MBEP applied for 20 s and left for 40 s. Sandblasted composite blocks (Lava Ultimate) of the same size were cemented to the samples using a dual-cure resin cement (RelyX Ultimate). All specimens were sectioned with a precision saw to obtain 0.64 mm2 sticks, which were tested after 72 hours of water storage for MTBS, using a universal testing machine (Instron) at a crosshead speed of 0.5 mm/min. For statistical analysis a 1 way ANOVA with Games-Howell post-hoc test was performed at α=0.05.
Results: Mean MTBS values are displayed in Table 1.
Conclusions: Bond strength to leucite reinforced glass ceramic using a self-etching primer is comparable to using HF acid and silane. However, using the self-etching primer on lithium-disilicate reinforced glass-ceramic might be a challenge with the given protocol.
Methods: CAD/CAM blocks were cut to 6 mm thick samples. Surface treatment for IPS Empress CAD groups was: 1. no HF acid, no silane; 2. 60 s HF acid, no silane; 3. 60 s HF acid, silane; 4. MBEP applied for 20 s and left for 40 s; 5. MBEP applied for 20 s and left for 100 s. IPS e.max CAD samples were treated: 6. 20 s HF, silane; 7. MBEP applied for 20 s and left for 40 s. Sandblasted composite blocks (Lava Ultimate) of the same size were cemented to the samples using a dual-cure resin cement (RelyX Ultimate). All specimens were sectioned with a precision saw to obtain 0.64 mm2 sticks, which were tested after 72 hours of water storage for MTBS, using a universal testing machine (Instron) at a crosshead speed of 0.5 mm/min. For statistical analysis a 1 way ANOVA with Games-Howell post-hoc test was performed at α=0.05.
Results: Mean MTBS values are displayed in Table 1.
Conclusions: Bond strength to leucite reinforced glass ceramic using a self-etching primer is comparable to using HF acid and silane. However, using the self-etching primer on lithium-disilicate reinforced glass-ceramic might be a challenge with the given protocol.