The Effect of Toothbrushing Regimes via Different Toothpastes in Removing the Discoloration of Three-Dimensional Printed Laminate Veneer Restorations

Background: The aim of this in vitro study is to investigate the effectiveness of toothbrushing applied with different toothpastes for removing the discoloration of 3D-printed laminate veneer restorations. Methods: Two different 3D printing resins (Alias Temporary 3D Printing Resin-Dokuz Kimya and VarseoSmile Crown Plus-Bego) were tested. A 3D-printer (Varseo XS-Bego) was used to produce a total of 80 laminate veneer restorations, 40 of each resin type. After the baseline color measurement by spectrophotometer (Vita Easyshade Advance 5.0-Vita Zahnfabrik), the specimens were immersed in distiled water and coffee (Nescafe-Nestle) for 15 days and the color measurement was repeated. Then, the specimens were subjected to toothbrushing simulation for 3 minutes twice a day for 15 days via an electric toothbrush (Vitality-Oral B) with different toothpastes as Colgate Sensation White-Palmolive, Ipana Pro-Expert-Ipana and Bioniq-Dr. Wolff. The color measurement was repetaed and the color changes after discoloration (ΔE1) and toothbrushing simulation (ΔE2) were calculated. Results: The differences between ΔE1 values of all resin groups were significant (p˂0.05). After toothbrushing simulation, the VarseoSmile Crown Plus resins stored in coffee showed significant color restitution (ΔE2bioniq=11.70, ΔE2colgate=11.79, ΔE2ipana=11.79), but Alias Temporary 3D printing resin showed significant color restitution (ΔE2=18.69) only via Ipana Pro-expert toothpaste (p