IADR Abstract Archives

Wear Behavior of Restorative Materials Against Zirconia

Objective: The purpose of this in-vitro study was to compare the quantity of abrasive wear caused by zirconia in amalgam, composite, zirconia, and lithium-disilicate restorative materials.

Methods: Five sample specimens of amalgam (A; Tytin, Kerr), composite (C; Estelite Sigma Quick, Tokuyama), zirconia (Z; Everest, Kavo), lithium-disilicate ceramic (LD; IPS e.max, Ivoclar Vivadent), and enamel (E; from buccal cusps of premolars), were individually embedded in acrylic resin molds and then polished through a standardized protocol until level surfaces were achieved. Each sample underwent 10,000 and 220,000 cycles of wear, under 5 kg-weighted (49 N of chewing force) zirconia antagonists (Prettau Zirconia, Zirkonzahn), with an SD Mechatronik CS-4.2 economy-line chewing simulator. Light-body PVS impressions were taken of each sample’s wear facet, and the volume and height of each impression was measured with a Zygo NewView 6K series profilometer and calculated with MetroPro software. ANOVA and post hoc Tukey’s test was used to compare heights and volumes between samples (p=0.01).

Results: After 10,000 wear cycles, from greatest to least, the order of height-loss was: C (127.41µm)^a, LD (83.65µm)^b, E (46.46µm)^c, A (19.82µm)^d, Z (7.71µm)^d, and the order of volume-loss was: C (1.44x10⁸µm³)^a, LD (9.11x10⁷µm³)^b, E (2.3x10⁷µm³)^c, A (5.07x10⁶µm³)^c, Z (1.90x10⁶µm³)^c.

After 220,000 wear cycles, from greatest to least, the order of height-loss was: C (672.78µm)^a, LD (514.31µm)^b, A (157.32µm)^c, E (130.05µm)^c, Z (39.43µm)^c, and the order of volume-loss was: C (2.22x10⁹µm³)^a, LD (1.45x10⁹µm³)^b, A (1.87x10⁸µm³)^c, E (1.35x10⁸µm³)^c, Z (4.52x10⁷µm³)^c. Different letters in superscript following values indicate statistical significance.

Conclusion: Zirconia caused significantly more abrasive wear to composite and lithium-disilicate ceramic than to enamel, amalgam, and zirconia.

Division: IADR/AMER General Session
Meeting: 2014 IADR/AMER General Session (Cape Town, South Africa)
Location: Cape Town, South Africa
Year: 2014
Final Presentation ID: 325
Abstract Category|Abstract Category(s): Dental Materials 9: Other Materials - Chemistry, Properties and Performance

Authors

Seetner, Jordan ( University of Pennsylvania, School of Dental Medicine, Philadelphia, PA, USA )

Yi, Yuanfu ( General Hospital of Chinese Armed Police Forces, Department of Stomatology, Beijing, , China ; University of Pennsylvania, School of Dental Medicine, Philadelphia, PA, USA )

Ozer, Fusun ( University of Pennsylvania, School of Dental Medicine, Philadelphia, PA, USA )

Blatz, Markus ( University of Pennsylvania, School of Dental Medicine, Philadelphia, PA, USA )

SESSION INFORMATION

Poster Session
Surface Roughness and Wear
06/26/2014