IADR Abstract Archives
Effect of Immediate Dentin Sealing on Microleakage of Cemented Crowns
Objectives: To evaluate the effect of Immediate dentin sealing (IDS) on the depth of microleakage of different luting agents used to cement CAD/CAM e.max crowns.
Methods: Eighteen extracted molar teeth were prepared to receive a crown. Then all teeth received a temporary crown cemented with Temp-Bond NE (Kerr) and then stored in distilled water for two weeks to simulate the clinical situation. Temporary crowns were fabricated using Luxatemp (DMG America). IPS e.max CAD/CAM crowns (Ivoclar) were fabricated using Omnicam (Dentsply-Sirona) software version 4.2 and machined with the CEREC MCXL (Dentsply-Sirona) with a thickness of no more than 1 mm all around.
Three different luting agents were used to cement these crowns. GC FujiCem 2 (GC America), Variolink Esthetic LC (Ivoclar), and Multilink Automix (Ivoclar). Two different groups with different dentin conditions were used for each cement type, either Immediate Dentin Sealing (IDS) or Delayed Dentin Sealing (DDS). The IDS groups were sealed using OptiBond Fl (Kerr), and it was done immediately after the preparation.
Then all teeth were placed in 50 % (w/v) ammoniacal silver nitrate for 24 h followed by submerging in a developer solution D-76 (Kodak) under light for 8 h. Specimens were then embedded in epoxy resin (Buehler), sectioned, and prepared for reading of the depth of penetration of silver particles by FE-SEM (Hitachi SU6600, Japan) using backscattering imaging. The depth of penetration of silver was analyzed with One-way ANOVA t-test, a=0.05.
Results: The DDS groups using both GC FujiCem 2 and Multilink automix show significant higher microleakage compare to their counterpart IDS groups (Table 1).
Conclusions: Delayed sealing of the dentin negatively affect the microleakage when using GC FujiCem 2 and Multilink Automix for cementation of ceramic crowns.
Methods: Eighteen extracted molar teeth were prepared to receive a crown. Then all teeth received a temporary crown cemented with Temp-Bond NE (Kerr) and then stored in distilled water for two weeks to simulate the clinical situation. Temporary crowns were fabricated using Luxatemp (DMG America). IPS e.max CAD/CAM crowns (Ivoclar) were fabricated using Omnicam (Dentsply-Sirona) software version 4.2 and machined with the CEREC MCXL (Dentsply-Sirona) with a thickness of no more than 1 mm all around.
Three different luting agents were used to cement these crowns. GC FujiCem 2 (GC America), Variolink Esthetic LC (Ivoclar), and Multilink Automix (Ivoclar). Two different groups with different dentin conditions were used for each cement type, either Immediate Dentin Sealing (IDS) or Delayed Dentin Sealing (DDS). The IDS groups were sealed using OptiBond Fl (Kerr), and it was done immediately after the preparation.
Then all teeth were placed in 50 % (w/v) ammoniacal silver nitrate for 24 h followed by submerging in a developer solution D-76 (Kodak) under light for 8 h. Specimens were then embedded in epoxy resin (Buehler), sectioned, and prepared for reading of the depth of penetration of silver particles by FE-SEM (Hitachi SU6600, Japan) using backscattering imaging. The depth of penetration of silver was analyzed with One-way ANOVA t-test, a=0.05.
Results: The DDS groups using both GC FujiCem 2 and Multilink automix show significant higher microleakage compare to their counterpart IDS groups (Table 1).
Conclusions: Delayed sealing of the dentin negatively affect the microleakage when using GC FujiCem 2 and Multilink Automix for cementation of ceramic crowns.
