IADR Abstract Archives
Bonding of a Universal Adhesive to Differently Pretreated Lithium Disilicate
Objectives: Objectives: Per manufacturers’ instructions, glass ceramic has to be etched and silane treated before cementation. Aim of this study was to investigate the bond strength of a silane containing universal adhesive (ScotchbondTM Universal, SBU, 3M Oral Care) with its adhesive resin cement (RelyXTM Ultimate, RXU, 3M Oral Care) to lithium disilicate (LDS) with different pretreatments.
Methods: Methods: LDS disks (e.max CAD, Ivoclar-Vivadent) were etched using hydrofluoric acid (IPS Ceramic Etching Gel, HF, Ivoclar-Vivadent) or Monobond Etch&Prime (MBEP, Ivoclar-Vivadent) and primed using SBU, RelyX Ceramic Primer (RCP, 3M Oral Care) or MBEP (see table). Stainless steel rods (4mm diameter) were cemented onto the disks under standardized pressure (20g/mm2) using RXU. Multilink Automix (MLA, Ivoclar-Vivadent) with Monobond Plus (MBP, Ivoclar-Vivadent) on HF-etched LDS was used as control. All materials were applied according to manufacturer’s instructions. Specimens were stored for 24h at 36°C and 100% relative humidity. Half of the specimens were artificially aged (5000 thermal cycles (TC), 5°C - 55°C, 30sec dwell time). Shear bond strength (SBS) was measured using a universal testing machine (Zwick Z010, crosshead speed: 0.75mm/min; n=6).
Results: Results: See table. The standard deviations (SD) are given in parentheses. Data were analyzed by ANOVA and multiple comparisons using Fisher’s LSD procedure (p<0.05). Means with the same letters are statistically the same.
Conclusions: Conclusions: In order to maximize SBS, etching with HF or MBEP is necessary. On etched substrates, SBU and conventional silane primers achieve SBS of about 40 MPa and more before and after TC.
Methods: Methods: LDS disks (e.max CAD, Ivoclar-Vivadent) were etched using hydrofluoric acid (IPS Ceramic Etching Gel, HF, Ivoclar-Vivadent) or Monobond Etch&Prime (MBEP, Ivoclar-Vivadent) and primed using SBU, RelyX Ceramic Primer (RCP, 3M Oral Care) or MBEP (see table). Stainless steel rods (4mm diameter) were cemented onto the disks under standardized pressure (20g/mm2) using RXU. Multilink Automix (MLA, Ivoclar-Vivadent) with Monobond Plus (MBP, Ivoclar-Vivadent) on HF-etched LDS was used as control. All materials were applied according to manufacturer’s instructions. Specimens were stored for 24h at 36°C and 100% relative humidity. Half of the specimens were artificially aged (5000 thermal cycles (TC), 5°C - 55°C, 30sec dwell time). Shear bond strength (SBS) was measured using a universal testing machine (Zwick Z010, crosshead speed: 0.75mm/min; n=6).
Results: Results: See table. The standard deviations (SD) are given in parentheses. Data were analyzed by ANOVA and multiple comparisons using Fisher’s LSD procedure (p<0.05). Means with the same letters are statistically the same.
Conclusions: Conclusions: In order to maximize SBS, etching with HF or MBEP is necessary. On etched substrates, SBU and conventional silane primers achieve SBS of about 40 MPa and more before and after TC.