Influence of filler geometry and viscosity of composite luting materials on marginal adhesive gap width and occlusal surface height of all-ceramic partial crowns. Issue 4 (April 2022)

• Record Type: Journal Article
• Authors: Soliman, Sebastian; Casel, Carolin; Krug, Ralf; Krastl, Gabriel; Hahn, Britta
• Is Part Of: Dental materials. Volume 38:Issue 4(2022)
• Page Start: 601
• Page End: 612
• Publication Date: 2022-04
• Subjects: CAD/CAM -- All-ceramic partial crowns -- Viscosity -- Composite luting materials -- Occlusal surface height increase -- Filler geometry -- Marginal adhesive gap -- Spherical fillers -- Heterogeneous fillers -- Amorphous fillers -- Sonic insertion technique; Dentistry -- Periodicals; Dental materials -- Periodicals; 617.695
• DOI: 10.1016/j.dental.2021.10.007
• Languages: English
• ISSNs: 0109-5641

Abstract

Abstract: Objectives: To evaluate the influence of filler geometry and viscosity of luting composites on marginal adhesive gap width (MGW) and occlusal surface height (OSH) of all-ceramic partial crowns. Methods: Forty-eight all-ceramic partial crowns (Celtra Duo, Dentsply) were created and divided into six groups (n = 8). Restorations were bonded using universal adhesive (Prime & Bond Active, Dentsply) in combination with low-viscosity composites (LV) containing amorphous fillers (Calibra Ceram, Dentsply) (LV-AF), heterogeneous fillers (Tetric EvoFlow, Ivoclar Vivadent) (LV-HF) vs. high-viscosity composites (HV) containing spherical fillers (Ceram.x, Dentsply) (HV-SF) or heterogeneous fillers (Tetric EvoCeram, Ivoclar Vivadent) (HV-HF). HV materials were used either with or without sonication. MGW [µm] was measured by SEM. Displacements of the restorations after luting, such as changes (Δ) in OSH [µm], tilting and rotation [°], were measured using a dial gauge and 3D-analytical software (OraCeck, Cyfex). Statistical analysis was by Mann-Whitney U -test and t -test with α = 0.05. Results: MGW (p = 0.002) and tilting (p = 0.001) were significantly smaller with LV (228.0 ± 112.35 µm; 0.89 ± 1.25°) than with HV (338.1 ± 97.26 µm; 1.95 ± 1.26°). Sonication had no effect on MGW in HV-HF (332.32 ± 91.39 µm) and HV-SF (343.85 ± 105.48 µm; p = 0.74). Sonication decreased ΔOSH by ~50% with HV-SF (64.21 ± 27.90 µm) but remained unchanged with HV-HF (39.06 ± 14.08 µm; p = 0.004). There was no difference in rotation between HV (0.82 ± 0.81°) and LV (0.61 ± 0.74°; p = 0.29). The LV-AF and LV-HF groups showed no statistical differences in MGW, ΔOSH, tilting or rotation (p > 0.05). Significance: Irrespective of filler geometry and insertion technique, the use of high-viscosity composites for the adhesive cementation of modern all-ceramic partial crowns increases displacement, marginal misfit and occlusal surface height. Highlights: Using high-viscosity composites for luting ceramic partial crowns causes marginal misfit Viscosity of the luting material determines occlusal surface height after luting Low-viscosity luting materials facilitate seating of ceramic partial crowns