Fracture Load of Ceramic Laminate Veneers Cemented with Different Methods

Objectives: The immediate denting bonding technique has been advocated for sealing of the dentin in indirect restorations, directly following tooth preparation prior to impression taking. The aim of this study was to evaluate the fracture load of ceramic laminate veneers cemented by immediate dentin bonding technique.

Methods: Sixteen extracted maxillary central incisors were prepared entirely on dentin to receive ceramic laminate veneers. Half of the veneers (IPS Empress) were cemented by immediate dentin bonding application in which dentin adhesive (Optibond FL) was applied immediately after preparation prior to impression taking. The other half was cemented without immediate dentin bonding but following the construction of the veneers by using the Optibond FL in combination with Variolink II resin cement. Unrestored teeth were used as control (n:8). Veneers were loaded until fracture  following the thermocycling process (5-55º, 3500 times). Statistical analyses was performed using ANOVA.

Results: Mean fracture resistances and standard deviations (SD) were shown below (N):  

 The immediate dentin bonding technique did not have significant effect on fracture resistance of laminate veneers whereas fracture resistance of intact tooth was significantly higher than the veneered groups (p<0.001).

Conclusions: Ceramic laminate veneers with preparation designs entirely on dentin yielded lower fracture loads than intact central incisors. The use of immediate dentin bonding technique did not significantly affect the fracture resistance of the ceramic laminate veneers.                        

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