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Ella Naumova   Dr.  University Educator/Researcher 
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Ella Naumova published an article in February 2019.
Research Keywords & Expertise
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Top co-authors See all
Wolfgang H. Arnold

63 shared publications

Department of Biological and Material Sciences in Dentistry; School of Dentistry, Faculty of Health, Witten/Herdecke University; Witten Germany

Thomas Dittmar

35 shared publications

Department of Immunology, Center for Biomedical Education and Research, Faculty of Health, Witten/Herdecke University, 58453 Witten, Germany

Peter Gaengler

27 shared publications

ORMED Institute for Oral Medicine at the University of Witten/Herdecke, Witten, Germany

Rainer A Jordan

18 shared publications

Department of Operative and Preventive Dentistry, Faculty of Health, School of Dentistry, Witten/Herdecke University, Witten, Germany

Ljubisa Markovic

13 shared publications

Faculty of Health, Department of Dentistry, University of Witten/Herdecke, Alfred Herrhausenstrasse 50, 58448 Witten, Germany

Publication Record
Distribution of Articles published per year 
(2008 - 2019)
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Publications See all
Article 0 Reads 0 Citations Low-Pressure Plasma Sterilization for Test Specimens to be Worn on Splints in the Oral Cavity Ella A. Naumova, Alexander-Simon Engel, Hagen Tizian Kranz, ... Published: 06 February 2019
Coatings, doi: 10.3390/coatings9020099
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Bacterial biofilms adhere to all oral surfaces and may alter or degrade them. For investigations of the oral biofilm, growing on new restorative dental biomaterials, sterilized dental enamel surfaces as natural, control, and reference materials are used. A novel method for disinfection and sterilization of surfaces is low-pressure plasma (LPP) sterilization, which is a nondestructive and nontoxic technology. The roughness of the dental enamel surface was determined before and after LPP sterilization. Enamel discs were placed in dental splints and worn for five days in vivo. Oral biofilm was fixed for scanning electron microscopy (SEM). Biofilms growing in vitro were characterized microbiologically before and after sterilization and examined by confocal laser scanning microscopy (CLSM). Microbiology demonstrated that various bacterial strains were present in the biofilms. SEM showed multiple layers of densely packed bacteria, and CLSM demonstrated that the biofilm contained live and dead bacteria. After LPP sterilization, no biofilm could be detected, and the enamel surface remained unaltered. It may be concluded that LPP sterilization is an effective, nondestructive method for disinfection of enamel before application in the oral cavity. LPP sterilization may be suitable for sterilization of dental materials without altering their surfaces.
Article 2 Reads 0 Citations Influence of Luting Materials on the Retention of Cemented Implant-Supported Crowns: An In Vitro Study Ella A. Naumova, Felix Roth, Berit Geis, Christine Baulig, W... Published: 28 September 2018
Materials, doi: 10.3390/ma11101853
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The retention force of cemented crowns on implant abutments with various luting materials was evaluated. Cobalt–chromium crowns were cemented onto tapered titanium abutments (Camlog) with eugenol-free temporary cement (RelyX TempBond NE), composite-based temporary cement (Bifix Temp), zinc phosphate cement (Harvard Cement), glass-ionomer cements (Meron, Fuji I), and resin-modified glass-ionomer cements (Fuji II, Fuji Plus, Ketac Cem Plus). Specimen aging via hydrostress was performed in artificial saliva at 37 °C for 14 days (S1), followed by hydrothermal stress with thermocycling (S2). The crowns were removed, and the force was recorded (T1). Subsequently, the crowns were recemented, aged, and removed, and the force was recorded (T2, T3). The retention forces differences were statistically significant according to the storage conditions at T1 (p = 0.002) and T3 (p = 0.0002). After aging (S1), Ketac Cem Plus had the highest retention force median value difference (T3 versus T1) (−773 N), whereas RelyX TempBond NE had the lowest (−146 N). After aging (S2), Meron had the highest retention force median value difference (−783 N), whereas RelyX TempBond NE had the lowest (−168 N). Recementation decreased the retention force of the implant-supported cobalt–chromium crowns cemented and recemented with the same luting materials. Luting materials (at T1) and aging conditions significantly impacted the retention force.
Article 2 Reads 0 Citations Marginal quality of ceramic inlays after three different instrumental cavity preparation methods of the proximal boxes Ella A. Naumova, Fabian Schiml, Wolfgang H. Arnold, Andree P... Published: 04 June 2018
Clinical Oral Investigations, doi: 10.1007/s00784-018-2492-0
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The marginal quality of ceramic inlays was evaluated after the use of three different instrumental finishing methods in mesio-occluso-distal (mod) cavity boxes in vitro after hydrothermal loading (HTL). Caries-free human molars were divided into three groups. Mod-cavities were conventionally prepared. Box finishing was performed in every group with rotating (RI), sonic (SI), or ultrasonic (USI) instruments. Surface roughness was examined. Twelve mod-cavities remained untreated. Continuous margin quality was evaluated with scanning electron microscopy (SEM). Ceramic inlays were cemented into cavities. After HTL microleakage, marginal and absolute marginal gaps were examined. All data were analyzed statistically. Significant differences were found, between cavity surface roughness of RI and SI groups, the RI and USI groups, but not between microleakage, marginal, absolute marginal gaps after HTL and in proximal marginal quality. No correlations between microleakage and marginal gaps nor between microleakage and surface roughness were found. Mod-cavity proximal box finishing with SI or USI resulted in a higher surface roughness than the use of RI. The type of the finishing method did not influence the marginal quality of ceramic inlays. For the mod-cavity finishing, the use of SI and USI could be an alternative instrumental method to conventional RI methods with a lower risk of iatrogenic damage of the adjacent teeth. This study allows the practitioner to better determine the proper indications and limitations of the sonic and ultrasonic instruments for mod-cavity proximal box finishing.
Article 6 Reads 0 Citations Polishing of Monolithic Zirconia Crowns—Results of Different Dental Practitioner Groups Carla Kozmacs, Britta Hollmann, Wolfgang H. Arnold, Ella Nau... Published: 14 November 2017
Dentistry Journal, doi: 10.3390/dj5040030
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This pilot study evaluates the surface roughness of monolithic zirconia crowns after chairside polishing by different dental practitioner groups. Four practitioner groups (group I: dental clinical students (n = 6); group II: dentists < 2 years post-qualification experience (n = 6); group III: dentists > 2 years post-qualification experience (n = 6) and group IV: dental technicians (n = 6)) were asked to polish two CAD/CAM-fabricated full-contour zirconia crowns (48 in total). A two-step zirconia polishing kit was used in both trials. The first trial (T1) was conducted without a time limitation. In the second trial (T2), the polish was restricted to 15 seconds for each polisher. Two blinded investigators (I1 and I2) analyzed the surface roughness (Ra) before and after polishing (Alicona measuring system). No statistically significant difference in surface roughness was found between the polishing results of the dental practitioner groups. Major difference in surface finish was achieved by dental technicians, with a median value of 25.4 nm (interquartile range 10.15–35.26 nm) for I1 in T1. The lowest difference was achieved by dental students, with a median value of Ra = 6.72 nm (interquartile range 4.7–17.9 nm) in T1. In T2, experienced dentists showed the highest difference in surface finish, with a median value of 41.35 nm (interquartile range 7.77–54.11). No significant correlation was found between polishing time and polishing results. The polishing of monolithic zirconium dioxide crowns can be performed with the present polishing set directly chairside after occlusal adjustment, regardless of the practitioner’s experience level.
Article 3 Reads 1 Citation Wear Behavior of Ceramic CAD/CAM Crowns and Natural Antagonists Ella A. Naumova, Stephan Schneider, Wolfgang H. Arnold, Andr... Published: 28 February 2017
Materials, doi: 10.3390/ma10030244
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Objective: Evaluation of wear behavior of computer-aided design/computer-aided manufacturing (CAD/CAM) crowns from various restorative materials and natural antagonists. Method: Full CAD/CAM crowns fabricated with nanoceramic resin (Lava Ultimate (LU)), a glass ceramic in a resin interpenetrating matrix (Vita Enamic (VE)) and a lithium silicate reinforced ceramic enriched with zirconia (Vita Suprinity (VS)) were cemented on human molars. The crown and antagonists were subjected to simulated chewing. 3D data sets, before and after the chewing simulation, were generated and matched. Occlusal surface roughness, vertical and volume loss of the crowns and antagonists were analyzed. Results: Crown roughness was significantly different between the LU and VE groups after chewing simulation. Crown vertical loss differed in all groups. The highest crown volume loss was found in the LU group, and the lowest in the VE group. Comparisons between the LU and VE groups and the LU and VS groups were significantly different. The highest antagonist volume loss was reached in the VE group, the lowest was in the LU group. Conclusion: Roughness increased after chewing simulation. LU crowns are the most natural antagonist-friendly; these were the most susceptible to vertical and volume loss. Of the tested materials, the VE crowns are the most stable regarding occlusion.
Article 0 Reads 0 Citations Adhesion of different resin cements to enamel and dentin Ella A. Naumova, Saskia Ernst, Katharina Schaper, Wolfgang H... Published: 01 January 2016
Dental Materials Journal, doi: 10.4012/dmj.2015-174
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