Effect of fluoride-containing desensitizing agents on the bond strength of resin-based cements to dentin.
OBJECTIVE
The objective of this study was to evaluate the effect of desensitizing agents containing different amounts of fluoride on the shear bond strength of a dual polymerized resin cement and a resin-modified glass ionomer cement (RMGIC) to dentin.


METHODS
One hundred human molars were mounted in acrylic resin blocks and prepared until the dentin surface was exposed. The specimens were treated with one of four desensitizing agents: Bifluorid 12, Fluoridin, Thermoline and PrepEze. The remaining 20 specimens served as untreated controls. All groups were further divided into 2 subgroups in which a dual polymerized resin cement (Bifix QM) or a resin-modified glass ionomer cement (AVANTO) was used. The shear bond strength (MPa) was measured using a universal testing machine at a 0.5 mm/min crosshead speed. The data were analyzed statistically with a 2-way ANOVA, Tukey HSD test and regression analysis (alpha=0.05). The effect of the desensitizing agents on the dentin surface was examined by scanning electron microscopy.


RESULTS
The fluoride-containing desensitizing agents affected the bond strength of the resin-based cements to dentin (p<0.001). PrepEze showed the highest bond strength values in all groups (p<0.001).


CONCLUSIONS
Regression analysis showed a reverse relation between bond strength values of resin cements to dentin and the amount of fluoride in the desensitizing agent (p<0.05).
Saraç
Duygu
D
Department of Prosthetic Dentistry, Faculty of Dentistry, Ondokuz May s University, Samsun, Turkey. dsarac@omu.edu.tr
Külünk
Safak
S
Saraç
Y Sinasi
YS
Karakas
Ozlem
O
D000268:Adhesiveness; D002124:Calcium Fluoride / Q000737:chemistry; D002327:Cariostatic Agents / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D057133:Dentin Desensitizing Agents / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D005460:Fluorides, Topical / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D012969:Sodium Fluoride / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
C515607:Bifix composite; C094502:Bifluorid 12; D002327:Cariostatic Agents; D003188:Composite Resins; D057133:Dentin Desensitizing Agents; D017220:Dentin-Bonding Agents; D005460:Fluorides, Topical; D005899:Glass Ionomer Cements; D019279:Resin Cements; C112191:fluoridin N-5; D014867:Water; D012969:Sodium Fluoride; D002124:Calcium Fluoride; D005459:Fluorides