Title: 0914 - Effect of Artificial Aging on Shear Bond Strength of Self-adhesive Resin Cements to Lithium Disilicate Glass Ceramic
Sigrid Hader (Presenter)
3M Deutschland GmbH
Manfred Ludsteck, 3M Deutschland GmbH
Kai Claussen, 3M
Reinhold Hecht, 3M Deutschland GmbH
Objectives: Analyze shear bond strength (SBS) of self-adhesive resin cements to IPS e.max® CAD restoration material in self-cure (sc) and light-cure (lc) mode with and without thermal aging.
Methods: Materials tested were Panavia™ SA Cement Plus (PANSA, Kuraray), Calibra® Universal (CALU, Dentsply) and RelyX™ Unicem 2 (RXU2, 3M ESPE).
72 specimens (l=14mm; w=12mm; h=4mm) of IPS e.max® CAD (Ivoclar) were fabricated and pretreated according to manufacturer’s instructions using Monobond® Etch&Prime (Ivoclar). Stainless steel rods (4mm diameter) were cemented onto the restoration specimens under standardized pressure (20g/mm2) using PANSA, CALU and RXU2 according to manufacturers’ instructions in sc- and lc-mode (n=6). Specimens were stored for 24h (36°C,100% relative humidity) or stored for 24h (36°C,100% relative humidity) and subjected to artificial aging (5000 thermal cycles(TC),5°C - 55°C,30s dwell time). SBS was measured (Zwick Z010, crosshead speed: 0.75mm/min).
Data analysis was performed using Tukey’s pairwise comparison (p<0.05).
Results: See table. Values within one row marked with different superscript characters are statistically different.
Conclusions: All cements showed comparable bond strength after 24 hours in both curing modes. However, RelyX™Unicem 2 maintained its shear bond strength level after artificial aging whereas the shear bond strength of Panavia™ SA Cement Plus and Calibra® Universal declined significantly in both curing modes.
|SBS after 24h [MPa]||Standard deviation [MPa]||SBS after 24h + TC [MPa]||Standard deviation [MPa]|
|PANSA sc||45.1 a||4.0||31.5 b||7.0|
|CALU sc||42.3 c||2.2||22.0 d||13.8|
|RXU2 sc||51.2 e||5.6||52.5 e||4.7|
|PANSA lc||47.4 f||5.9||30.5 g||10.6|
|CALU lc||49.1 h||6.2||22.2 i||1.5|
|RXU2 lc||49.2 j||9.3||40.4 j||6.9|
This abstract is based on research that was funded entirely or partially by an outside source:
3M Oral Care
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: All employees of 3M Oral Care