Comparison of the effect of storage media on shear punch strength of resin luting cements.
OBJECTIVE
To measure the shear punch strength of eight resin-containing luting cements before and after immersion in acidic solution and ethanol at different temperatures (37 degrees C and 60 degrees C).


METHODS
Specimens were prepared from six resin luting cements; Set (SDI), Panavia F (Kuraray), RelyX Veneer (3M/ESPE), VarioloinkII (Ivoclar), Maxcem (Kerr), Nexus2 (Kerr) and two Resin-modified glass-ionomer luting cements (RM-GICs); GC Fuji Plus (GC Corporation), RelyX Luting 2 (3M/ESPE). For each material a total of 114 disc-shaped specimens were prepared. Six specimens were immersed in distilled water for 24 h at 37 degrees C, polished and subjected to baseline measurement for shear punch strength. The remaining 108 specimens were randomly divided into 18 groups of six, and immersed in three solutions; distilled water, 0.01 mol/L lactic acid, and 50% ethanol at 37 degrees C or 60 degrees C, for 1 week, 1 month or 3 months. Specimens were washed, dried and tested for final shear punch strength.


RESULTS
Values were material and solution dependent. Values of Nexus 2 and Rely X Veneer are the highest, and Rely X Luting 2 the lowest. Ethanol and lactic acid specimens showed significantly lower values compared with the distilled water specimens.


CONCLUSIONS
The shear punch strengths of the resin-containing luting cements were affected by time and storage solution. While some of the resin luting cements had significantly higher values compared to that of the RM-GICs, there were no significant differences between the RM-GICs and resin cements such as Panavia F and Set.
Bagheri
Rafat
R
School of Dental Science, Shiraz University of Medical Science, Shiraz, Iran. bagherir@unimelb.edu.au
Mese
Ayşe
A
Burrow
Michael F
MF
Tyas
Martin J
MJ
D003188:Composite Resins / Q000737:chemistry; D003775:Dental Polishing / Q000379:methods; D004356:Drug Storage; D000431:Ethanol / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D007101:Immersion; D019344:Lactic Acid / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D012997:Solvents / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
D003188:Composite Resins; D005899:Glass Ionomer Cements; C515955:Maxcem; D008689:Methacrylates; C433206:Nexus; C438843:Panavia-Fluoro; D011140:Polyurethanes; C528569:Rely-X; D019279:Resin Cements; D012997:Solvents; C084550:Vitremer; D014867:Water; C029824:urethane dimethacrylate luting resin; C103502:Variolink; D019344:Lactic Acid; D000431:Ethanol