Einfluss eines Universal- und Mehr-Schritt-Adhäsivs auf den Randspalt von Klassse-V-Restaurationen aus Keramik und Komposit nach thermischer Wechselbelastung
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Aim of the study: The universal adhesive ScotchbondTM Universal Plus Adhesive (3MTM) and the multi-step adhesive system Syntac® (Ivoclar) were used in this in-vitro study for bonding composite fillings, composite inlays and ceramic inlays. The aim of this study was to determine which combination of adhesive system and restoration exhibits the least marginal gap formation after thermal cycling, in order to provide a recommendation for clinical application.
Materials and methods: 48 standardize class V cavities measuring 4 mm in width, 3,5 mm in height and 2 mm in depth were prepared in extracted third molars using cylindrical diamond-coated burs. The sample teeth were randomly divided into 6 groups of 8 cavities each. In the first two groups, ceramic inlays made of Celtra® Duo were fabricated using CEREC CAD/CAM technology (Dentsply Sirona Inc.). For the third and fourth group, composite inlays made of nanohybrid composite (Venus® Diamond Flow and Venus® Pearl, both from Kulzer GmbH) were produced in the cavities. Groups 5 and 6 were restored with direct resin fillings consisting of a lining layer (Venus® Diamond Flow) followed by a layer of high-viscosity composite (Venus® Pearl). Syntac® (ivoclar) was used as the adhesive system for groups 2, 4 and 6. As silane coupling agent for the ceramic inlay Monobond® Plus (ivoclar) was used in group 2. ScotchbondTM Universal Plus Adhesive (SBU+) was used for adhesive bonding in groups 1, 3 and 5. The restorations were polished and impressions were taken to create epoxy resin replicas before the thermal cycling load. The samples underwent 10 000 cycles in a thermocycler at 5°C and 55°C. Afterwards, impressions were taken again and new replicas were produced. The marginal gaps of all replicas were examined under a scanning electron microscope at 200 x magnification and subsequently analyzed.
Results : A complete marginal seal (100 %) to enamel was observed in all groups prior to thermocycling. In dentin, groups 5 and 6 performed significantly worse than groups 1-4. After thermocycling, all groups showed a slight to significant deterioration in marginal integrity compared to baseline values. Group 1 (ceramic inlays + SBU+), closely followed by group 2, achieved the best results in enamel and dentin without significant deviation from the baseline measurements. Groups 3 (composite inlays + SBU+) and 5 (composite fillings + SBU+) were significantly different from the baseline result after thermocycling. After group 4 (composite inlays + Syntac®), group 6 (composite filling + Syntac®) achieved the worst results. Compared to all other groups the values in enamel (after thermocycling) and dentin (before and after thermocycling) were significantly worse in this group.
Conclusion: The combination of SBU+, closely followed by Syntac®, and the ceramic inlay made of zirconia-reinforced lithium silicate achieved the best marginal seal and can be recommended for restoration margins involving both enamel and dentin. No additional silane is required when using SBU+ with Celtra® Duo. When treating a tooth with a composite inlay or a composite filling, the use of the universal adhesive is recommended due to the significantly better results obtained with SBU+ compared to Syntac®.
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Issued: 2026-02-05
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FB20:Medizin
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de
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DoctoralThesis
Keywords
AdhäsivtechnikUniversaladhäsivuniversal adhesiveKeramikinlayceramic inlayKlasse VClass VKompositinlaycomposite inlayKompositfüllungcomposite fillingSyntac®Celtr® DuoVenus®Scotchbond Universal Plus AdhesiveThermocycling
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Stadtmüller, Alexia: Einfluss eines Universal- und Mehr-Schritt-Adhäsivs auf den Randspalt von Klassse-V-Restaurationen aus Keramik und Komposit nach thermischer Wechselbelastung. : 2026-02-05.
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This item has been published with the following license: In Copyright