Marginal fitness and marginal leakage of fiber-reinforced composite crowns depending upon luting cements

Sun-Jong Kim, DDS, MSD,(a) Sang-Wan Shin, DDS, MSD,(a) Kyu-Won Suh, DDS, MSD,(a) and Jung-Suk Han, DDS, MSD(b)

(a)Department of Prosthodontics, Korea University, and bDepartment of Prosthodontics, Seoul National University, Seoul, Korea

Purpose: The purpose of this in-vitro study is to compare the marginal fitness and microleakage of the fiber-reinforced composite crowns (Targis/Vectris) cemented with various luting agents after thermocycling and dye penetration technique.
Materials and Methods: Fifty crowns were randomly assigned to 5 groups and cemented on the prepared natural extracted premolars with five different luting cements (Bistite II, Super-Bond, Variolink II, zinc phosphate, and glass-ionomer cement). After 24 hours of cementation, all specimens were thermocycled three hundred times in water baths of 5°Cand 55°C with 60 s soaking time. The marginal gap and leakage of each specimen were measured and recorded by a digital measuring microscope.
Results: The mean values of marginal discrepancy were 46.78 μm for Bistite II, 56.25 μm for Variolink II, 56.78 μm for Super-Bond, 99.21 μm for Fuji-I glass-ionomer cement, and 109.49 μm for zinc phosphate cement. There were significant differences in the marginal fit among three different cement systems (resin, glass ionomer, and zinc phosphate cement) (p<0.01). The less microleakage between tooth-cement and restoration-cement interface was observed in the order of Variolink II, Bistite II, Super-Bond, glass-ionomer, and zinc phosphate.
Conclusion: Specimens luted with resin cements (Bistite II, Super-Bond, Variolink II) exhibited less marginal leakage and marginal discrepancy than those of conventional glass-ionomer and zinc phosphate cement. (Int Chin J Dent 2002; 2: 33-47.)