|Baltic Dental and Maxillofacial Journal|
December, 2009, Vol. 11, No. 4
Early Morphofunctional Response of Contact Tissue after Intraosal Implantation in Rabbit Jaw of Pure Synthetic Hydroxyapatite (HAp) Bioceramic Materials and HAp Saturated with Lidocaine
© 2009 Stomatologija
Stomatologija 2009; 11 (4): 105-112 273 KB
Effects of different repolishing techniques on colour change of provisional prosthetic materials
Vygandas Rutkunas, Vaidotas Sabaliauskas
Objectives. To investigate repolishing effect of stained provisional prosthetic materials in vitro.
Methods. Thirty two cylindrical specimens (10 × 2 mm) were prepared for each of light-polymerized composites (Revotek LC, Rx-Create), bis-acryl composites (Structur Premium, Protemp Garant3, Luxatemp Fluorescence), methyl-methacrylate (UnifastTRAD) and ethyl-methacrylate (DentalonPlus) based provisional material using a mould. The specimens were divided into 4 groups (n=8) according to different repolishing techniques. The specimens were stored for 24 hours at 37°C in distilled water, and then transferred into 4 different staining agents. The colour was measured with a spectrophotometer (Vita Easyshade) before exposure and after repolishing procedures, and colour changes (ΔE) were calculated. Statistical analysis: three-way ANOVA, Tukey HSD post-hoc test (p<0.05).
Results. The influence of type of provisional material, polishing procedure, food colorants and combinations of them on colour change was significant (p<0.05). After the repolishing procedures, all the specimens stored in distilled water achieved an unnoticeable colour change (ΔE<3.7), except Dentalon Plus, Rx Create, Unifast TRAD. A similar tendency was observed in artificial food colourant solution following subsequent repolishing of the specimens. As for the red wine, all repolished specimens attained unnoticeable colour change (ΔE<3.7), except Dentalon Plus using Rx polishing paste, Enhance polishing set or repeated glazing procedure.
Conclusion. Repolishing was found to be an effective way to improve aesthetic appearance for provisional prosthetic materials by partially removing staining observed on the surface of the restorations
Key words: color stability, provisional prosthesis, repolishing.
Received: 16 04 2009
Accepted for publishing: 28 12 2009
*Department of Prosthodontics, Institute of Odontology, Faculty of Medicine, Vilnius university, Vilnius, Lithuania
Vygandas Rutkunas* DDS, Assoc. prof, PhD
Vaidotas Sabaliauskas* DDS
Address correspondence to Dr. Vygandas Rutkunas, Institute of Odontology, Faculty of Medicine, Vilnius university Zalgirio str. 115, 08217 Vilnius, Lithuania.
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