A comparison of a hybrid light-cured glass-ionomer base and liner vs. a light-cured resin tooth fragment attachment.
OBJECTIVE
The purpose of this study was to compare the dislodgement strengths and fracture types for reattached tooth fragments using a light-cured composite resin material, a hybrid light-cured glass ionomer base, and a hybrid light-cured glass ionomer liner.


METHODS
Seventy-five bovine incisor teeth were fractured, randomly divided into three groups of equal number, and then luted back together with three different materials (Universal Bonding Agent/TPH Composite Resin; VariGlass VLC Base; and VariGlass VLC Liner: LD Caulk Div Dentsply Int Inc, Milford, DE). The reattached fragments were subjected to thermocycling with a 40 degrees C differential and then were loaded until the force required to dislodge the fragment was reached.


RESULTS
The mean dislodgement strengths were 36.8 (+/- 25.6) kg for the composite resin, 36.4 (+/- 26.7) kg for the glass ionomer base, and 31.4 (+/- 29.5) kg for the glass ionomer liner. Cohesive fractures occurred in 73% of the dislodgements.


CONCLUSIONS
There was no statistically significant difference demonstrated (P < 0.05) between the three groups in terms of both dislodgement strength and fracture type.
Dean
J A
JA
Department of Oral Facial Development, Indiana University School of Dentistry, USA.
Minutillo
A L
AL
Moore
B K
BK
D000180:Acrylic Resins / Q000737:chemistry; D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry*; D003736:Dental Cavity Lining; D003764:Dental Materials / Q000737:chemistry; D003793:Dental Restoration, Permanent / Q000379:methods*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D007180:Incisor / Q000293:injuries / Q000503:physiopathology; D008027:Light; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry*; D013314:Stress, Mechanical; D013816:Thermodynamics; D014082:Tooth Fractures / Q000503:physiopathology*
D000180:Acrylic Resins; D003188:Composite Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; D019279:Resin Cements; C081982:VariGlass VLC