Dentin bond strength of fluoride-releasing materials.
OBJECTIVE
To evaluate the shear bond strength to dentin of fluoride-releasing materials.


METHODS
Human, noncarious extracted permanent molars stored in distilled water were used. Flat buccal and lingual dentin surfaces were ground wet on 600-grit silicon carbide paper. The teeth were then distributed at random into three groups of 8 teeth (16 surfaces) each: Group 1: Compoglass; Group 2: Fuji II LC; Group 3: Dyract. Cylindrical samples of the materials were prepared in plastic molds and bonded to the dentin surface according to the manufacturers' instructions. All samples were placed in distilled water for 24 hours, thermocycled for 500 cycles in distilled water at 6 degrees C and 60 degrees C and sheared with an Instron at a crosshead speed of 0.5 mm/minute.


RESULTS
In MPa: Group 1: 16.29 +/- 5.35; Group 2: 15.42 +/- 4.77; Group 3: 15.33 +/- 6.96. ANOVA revealed that there was no statistically significant difference between the groups. Fracture patterns, examined with the SEM, revealed material cohesive failures for all groups.
García-Godoy
F
F
Department of Pediatric Dentistry, University of Texas Health Science Center at San Antonio 78284-7888, USA.
Rodríguez
M
M
Barbería
E
E
D000704:Analysis of Variance; D020770:Compomers; D003188:Composite Resins / Q000494:pharmacology; D003793:Dental Restoration, Permanent; D017220:Dentin-Bonding Agents / Q000494:pharmacology*; D005460:Fluorides, Topical / Q000494:pharmacology*; D005899:Glass Ionomer Cements / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing / Q000379:methods; D008689:Methacrylates / Q000494:pharmacology; D008855:Microscopy, Electron, Scanning; D008963:Molar / Q000187:drug effects / Q000648:ultrastructure; D011897:Random Allocation; D012117:Resins, Synthetic / Q000494:pharmacology; D017640:Silicates / Q000494:pharmacology; D013718:Tensile Strength
C105428:Compoglass; D020770:Compomers; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C088486:Dyract; D005460:Fluorides, Topical; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D008689:Methacrylates; D012117:Resins, Synthetic; D017640:Silicates