Minimally invasive dentistry: bond strength of different sealant and filling materials to enamel.
OBJECTIVE
The purpose of this study was to evaluate the shear bond strength of different sealant and filling materials, used in minimally invasive dentistry, to human enamel.


METHODS
Thirty-five sound extracted third molars were selected. The crowns were longitudinally sectioned, embedded in polystyrene resin, and grounded until a flat enamel surface was reached. The samples were assigned into seven groups (n = 10), according to the materials: G1-Fluoroshield; G2-Clinpro; G3-Dyract AP; G4-F2000; G5-Vitremer; G6-Fuji IX; G7-Vidrion F. All materials were applied according to the manufacturer's instructions. The samples were stored in distilled water at 37 degrees C for 24 h and submitted to a shear bonding strength test in a universal testing machine with a crosshead speed of 0.5 mm/min. The failure sites were observed in Scanning Electron Microscopy (SEM). The data were submitted to ANOVA and Tukey's tests (p < 0.05).


RESULTS
The mean values (MPa) of shear bond strength were for Fluroshield (25.92 +/- 8.83), Vitremer (20.41 +/- 13.34), Dyract AP (17.08 +/- 6.38), Clinpro (12.82 +/- 8.38), F2000 (8.71 +/- 3.74), Fuji IX (7.64 +/- 2.57), and Vidrion F (4.54 +/- 2.11). Fluroshield resin sealant and Vitremer resin modified glass-ionomer showed statistically higher shear bond strength values than the conventional glass ionomer (GIC) cements. Clinpro and F2000 showed bond strength values with statistical difference only from Fluroshield. The failure mode varied among the groups. The majority of samples presented mixed failure.


CONCLUSIONS
FluroShield and Vitremer showed better performance of shear bond strength to enamel than conventional GIC.
Alonso
Roberta C B
RC
FOP/UNICAMP, Department of Pediatric Dentistry, Avenida Limeira 901 Areião 13414-018 Piracicaba, SP, Brazil. robalonso@yahoo.com
Correr
Gisele M
GM
Borges
Ana F S
AF
Kantovitz
Kamila R
KR
Rontani
Regina M P
RM
D000704:Analysis of Variance; D020770:Compomers; D003188:Composite Resins; D001840:Dental Bonding; D003743:Dental Enamel; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements; D006801:Humans; D008422:Materials Testing; D008963:Molar; D010895:Pit and Fissure Sealants; D019279:Resin Cements; D033081:Shear Strength
D020770:Compomers; D003188:Composite Resins; D005899:Glass Ionomer Cements; D010895:Pit and Fissure Sealants; D019279:Resin Cements