الفهرس 
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Abstract
Purpose: To evaluate and compare the 2-year clinical performance of an ormocer-based composite with that of methacrylate-based composite in class V anterior restorations. Laboratory investigations of their color matching and surface topography were assessed after storage in different staining media. Materials and Methods: Regarding the clinical trial, 35 patients, each with two class V anterior lesions, were enrolled in the study. Seventy restorations were placed 50% for each material; an ormocer-based composite, Admira Fusion X-tra/Futrabond M+; a methacrylate-based composite, Omnichroma/Plafique universal bond. A single operator placed all restorations according to the manufacturer instructions. Immediately after placement, the restorations were finished/polished and the patient was advised to return for follow-up at 6 month, 1 year and 2 year. The clinical performance of all restorations was evaluated for patients whom attended the 2-year recall visit. Two independent examiners perform all evaluations according to the World Dental Federation FDI criteria immediately after placement of restorations and at subsequent recall visits. The changes in the FDI parameters during the 2-years period were analyzed with Chi-square test. Comparison of the baseline scores with those at the recall visits was assessed using Friedman test. The level of significance was set at p< 0.005. Concerning laboratory investigations, a total 60 cylindrical centralized cavities (diameter: 5mm; depth: 2 mm) was prepared in sound extracted human central incisors and assigned into two equal groups according to the restorative material used (n=30). According to the staining media, the teeth of each group were assigned into three subgroups (n=10): artificial saliva, black tea, and cola. The color matching was measured for all restorations at baseline and after four weeks with a reflective spectrophotometer (X-Rite, model RM200QC, Neu-Isenburg, Germany). The surface topography was assessed using three-dimensional optical profilometry (Wyko, Model NT 1100, Veeco, Tucson, USA). The extracted data were analyzed using two-way analysis of variance (ANOVA), one-way ANOVA and Student’s t-test. Results: Regarding the clinical trial, there was no statistically significant difference among the two tested materials (p< 0.005). Both materials showed only minor changes between their performance at baseline and after 2 years except for their esthetic parameters. No failure was detected in both ormocer and methacrylate-based restorations. Concerning the laboratory baseline evaluation, there was no significant difference with respect to color matching or surface topography results between the two studied restorative materials. However, the differences were statistically significant after storage in different media. Conclusions: After 2 years, the ormocer and methacrylate-based composites showed acceptable clinical performance in Class V anterior restorations. In addition, they showed satisfactory color matching with different teeth shades and accepted surface smoothness, whereas the aging procedure exerted a negative effect on their blending capacity and surface characteristics especially the cola soft drink.