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Schubert A, Griesmüller C, Gersdorff N, Bürgers R, Wiechens B, Wassmann T. Antibacterial coating of orthodontic elastomeric ligatures with silver and bismuth nanofilms by magnetron sputtering: A feasibility study. Clin Exp Dent Res 2024; 10:e864. [PMID: 38433291 PMCID: PMC10909824 DOI: 10.1002/cre2.864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 01/11/2024] [Accepted: 01/20/2024] [Indexed: 03/05/2024] Open
Abstract
OBJECTIVES Magnetron sputtering was evaluated to equip surfaces of orthodontic elastomeric ligatures with silver and bismuth nanofilms. MATERIAL AND METHODS Antibacterial properties were evaluated by the adhesion of Streptococcus mutans. Polyurethane-based elastomeric ligatures were coated with silver and bismuth nanofilms via direct current magnetron sputtering. Surface roughness (Ra ) and surface-free energy (SFE) were assessed. Coated specimens were incubated with S. mutans for 2 h. Adhering bacteria were visualized by Hoechst staining and quantified by an ATP-based luminescence assay. One-way analysis of variance with Tukey post hoc testing and Pearson correlation analysis were performed (p < .05) to relate bacterial adhesion to surface roughness and surface-free energy. RESULTS Elastomeric ligatures were successfully coated with silver and bismuth nanofilms. Ra was significantly reduced by silver coating. Silver and bismuth coatings showed significantly higher SFE than controls. Adhesion of S. mutans was significantly decreased by silver coating. No correlation between bacterial adhesion and SFE was found. Correlation between bacterial adhesion and Ra was positive but not statistically significant. CONCLUSIONS Magnetron sputtering proved to be a feasible method to equip orthodontic elastomeric ligatures with silver and bismuth nanofilms. Silver coatings of elastomeric ligatures may reduce white spots and carious lesions in orthodontic patients. Future research is required to stabilize coatings.
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Affiliation(s)
- Andrea Schubert
- Department of ProsthodonticsUniversity Medical Center GoettingenGoettingenGermany
| | - Carolin Griesmüller
- Department of ProsthodonticsUniversity Medical Center GoettingenGoettingenGermany
| | - Nikolaus Gersdorff
- Department of ProsthodonticsUniversity Medical Center GoettingenGoettingenGermany
| | - Ralf Bürgers
- Department of ProsthodonticsUniversity Medical Center GoettingenGoettingenGermany
| | - Bernhard Wiechens
- Department of OrthodonticsUniversity Medical Center GoettingenGoettingenGermany
| | - Torsten Wassmann
- Department of ProsthodonticsUniversity Medical Center GoettingenGoettingenGermany
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Wiechens B, Brockmeyer P, Hampe T, Schubert A, Bürgers R, Wassmann T. How to register static occlusion - Correlation of contemporary techniques. Heliyon 2024; 10:e28130. [PMID: 38524618 PMCID: PMC10958416 DOI: 10.1016/j.heliyon.2024.e28130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 03/11/2024] [Accepted: 03/12/2024] [Indexed: 03/26/2024] Open
Abstract
Statement of problem A working knowledge of the analytical capacities of contemporary registration methods is essential for prosthetic treatment; however, there is a paucity of studies which coherently investigate the capabilities and limitations of the various diagnostic procedures utilized for prosthetic occlusion. Purpose The present prospective clinical study aimed to evaluate the similarities and differences among contemporary registration methods through comparative analysis. Material and methods The habitual static occlusion of 19 healthy individuals (14 women; mean age ± standard deviation, 30.8 ± 4.8 years) was analyzed 3 times a day, using shimstock foil, occlusal foil, wax registration, silicone registration, and computerized registration. The procedures were repeated after 14 days. Statistical analyses included all registrations referencing the first measurement point to assess the mean values of antagonistic contacts and the differences between these measurements. Pearson's and Kendall's correlation analyses were performed as part of the coherent mixed logistic regression model, and marginal probabilities were calculated using the registration technique and repeated measurements. Results Strong correlations were found among the various registration techniques. The largest effect sizes were observed among the wax, silicone, occlusion foil, and computerized registrations (r = 0.95, P < 0.001 to r = 0.62, P < 0.001), while the lowest effect sizes were found for shimstock correlations (τ = 0.41, P < 0.001 to τ = 0.27, P < 0.001). Occlusal changes per maxillary arch were observed referencing the first measurement time with wax registration (P < 0.001; 7.4%), shimstock foil (P < 0.001; 13.8%), computerized registration (P < 0.001; 20.3%), silicone registration (P = 0.009; 66.3%), and occlusion foil (P < 0.001; 98.8%). Occlusal changes per maxillary tooth were observed from the first incisor (P < 0.001; 5.7%) to the third molar (P < 0.001; 18.1%). Conclusions The results of the present study revealed that there are strong overall correlations among the various contemporary registration techniques. The different affinities of the techniques used to register occlusal changes, however, showed differences in the measurement techniques, which should be neither over- nor underestimated. The differential tendencies of teeth to change should be considered, even if a hypervariable system is assumed.
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Affiliation(s)
- Bernhard Wiechens
- Department of Prosthodontics and Department of Orthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Phillipp Brockmeyer
- Department of Maxillofacial Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Tristan Hampe
- Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Andrea Schubert
- Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Ralf Bürgers
- Professor and Head of Department, Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Torsten Wassmann
- Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
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Voß AS, Bunz O, Kurbad O, Bürgers R. Fully digital workflow of an occlusal device including digital facebow record: A clinical report. J Prosthet Dent 2024:S0022-3913(24)00061-1. [PMID: 38365524 DOI: 10.1016/j.prosdent.2024.01.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 01/09/2024] [Accepted: 01/10/2024] [Indexed: 02/18/2024]
Abstract
In many current digital workflows for the production of occlusal devices and dentures, the traditional facebow record for the individual determination of the hinge axis has been omitted. A novel digital facebow record procedure including a scannable occlusal fork is described as a straightforward to use, cost-effective, and less time-consuming alternative to close this gap in fully digital prosthetic workflows.
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Affiliation(s)
- Anna-Sophia Voß
- Prosthodontist, Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Oskar Bunz
- Prosthodontist, Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Oliver Kurbad
- Prosthodontist, Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Ralf Bürgers
- Professor and Head of Department, Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany.
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Wiessner A, Wassmann T, Wiessner JM, Schubert A, Wiechens B, Hampe T, Bürgers R. In Vivo Biofilm Formation on Novel PEEK, Titanium, and Zirconia Implant Abutment Materials. Int J Mol Sci 2023; 24:ijms24021779. [PMID: 36675292 PMCID: PMC9865206 DOI: 10.3390/ijms24021779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 12/16/2022] [Accepted: 01/11/2023] [Indexed: 01/18/2023] Open
Abstract
The formation of biofilms on the surface of dental implants and abutment materials may lead to peri-implantitis and subsequent implant failure. Recently, innovative materials such as polyether-ether-ketone (PEEK) and its modifications have been used as abutment materials. However, there is limited knowledge on microbial adhesion to PEEK materials. The aim of this in vivo study was to investigate biofilm formation on the surface of conventional (titanium and zirconia) and PEEK implant abutment materials. Split specimens of titanium, zirconia, PEEK, and modified PEEK (PEEK-BioHPP) were manufactured, mounted in individual removable acrylic upper jaw splints, and worn by 20 healthy volunteers for 24 h. The surface roughness was determined using widefield confocal microscopy. Biofilm accumulation was investigated by fluorescence microscopy and quantified by imaging software. The surface roughness of the investigated materials was <0.2 µm and showed no significant differences between the materials. Zirconia showed the lowest biofilm formation, followed by titanium, PEEK, and PEEK-BioHPP. Differences were significant (p < 0.001) between the investigated materials, except for the polyether-ether-ketones. Generally, biofilm formation was significantly higher (p < 0.05) in the posterior region of the oral cavity than in the anterior region. The results of the present study show a material-dependent susceptibility to biofilm formation. The risk of developing peri-implantitis may be reduced by a specific choice of abutment material.
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Affiliation(s)
- Andreas Wiessner
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Torsten Wassmann
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany
- Correspondence:
| | - Johanna Maria Wiessner
- Department of Orthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Andrea Schubert
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Bernhard Wiechens
- Department of Orthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Tristan Hampe
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Ralf Bürgers
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany
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Wiechens B, Brockmeyer P, Wassmann T, Rödiger M, Wiessner A, Bürgers R. Time of day-dependent deviations in dynamic and static occlusion: A prospective clinical study. J Prosthet Dent 2022:S0022-3913(22)00353-5. [PMID: 35811164 DOI: 10.1016/j.prosdent.2022.05.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 05/30/2022] [Accepted: 05/31/2022] [Indexed: 11/23/2022]
Abstract
STATEMENT OF PROBLEM The registration of dental occlusion is essential for prosthodontic treatment. However, studies on time-dependent changes of static and dynamic occlusion that may affect definitive restorations are lacking. PURPOSE The purpose of this prospective clinical study was to use conventional and digital occlusal registration techniques to evaluate time-dependent fluctuations in static and dynamic occlusion. MATERIAL AND METHODS The static and dynamic occlusion of 19 healthy individuals (14 women and 5 men with a mean ±standard deviation age of 30.8 ±4.8 years) was examined 3 times a day using occlusal foil (12-μm occlusion foil) and a digital sensor (T-Scan III). The procedure was repeated after 14 days. The statistical analysis covered all registrations referencing the first measurement point to assess occurring differences, and changes per tooth and arch were determined (α=.05). Potential influencing factors were calculated by using mixed logistic regression. Marginal probabilities were calculated considering the registration technique and the time of measurement. RESULTS Significant differences were found between registered occlusal patterns and the different registration techniques. Occlusal changes per maxillary dental arch were observed with static foil registration (P<.001; 98.8%), left laterotrusion foil registration (P=.001; 29.6%), right laterotrusion foil registration (P=.001; 29.6%), static sensor registration (P<.001; 20.3%), left laterotrusion sensor registration (P=.001; 71.7%), and right laterotrusion sensor registration (P=.005; 67.7%). None of the techniques showed higher probabilities of occlusal changes at a given time of day with respect to time-dependent changes. CONCLUSIONS The study revealed that occlusion cannot be considered constant and that the topography and intensity of the contact points vary. Circadian occlusion variance can be assumed without preferring a specific time of the day. This differentiated view of occlusion as a changing system helps to clarify the challenge of dental restorations for both the patient and the practitioner.
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Affiliation(s)
- Bernhard Wiechens
- Postdoctoral Researcher, Doctor of Medicine in Dentistry, Department of Prosthodontics and Department of Orthodontics, University Medical Center Göttingen, Göttingen, Germany.
| | - Phillipp Brockmeyer
- Senior Physician, Doctor of Medicine, Doctor of Medicine in Dentistry, PhD, Department of Maxillofacial Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Torsten Wassmann
- Senior Physician, Doctor of Medicine in Dentistry, Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Matthias Rödiger
- Assistant Professor, Doctor of Medicine in Dentistry, PhD, Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Andreas Wiessner
- Postdoctoral Researcher, Doctor of Medicine in Dentistry, Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Ralf Bürgers
- Professor and Head of Department, Doctor of Medicine in Dentistry, PhD, Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
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Wiechens B, Paschereit S, Hampe T, Wassmann T, Gersdorff N, Bürgers R. Changes in Maximum Mandibular Mobility Due to Splint Therapy in Patients with Temporomandibular Disorders. Healthcare (Basel) 2022; 10:healthcare10061070. [PMID: 35742121 PMCID: PMC9222556 DOI: 10.3390/healthcare10061070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 06/06/2022] [Accepted: 06/07/2022] [Indexed: 11/16/2022] Open
Abstract
Splint therapy is widely used in the treatment of myofascial pain, but valid studies on the efficacy of this therapy are rare. The purpose of the present study was to investigate which qualifiable and quantifiable effects of splint therapy are detectable. For this purpose, 29 patients (21 women, mean age 44.6 ± 16 years) diagnosed with myofascial pain (RDC/TMD) were investigated in this prospective clinical trial (10/6/14An). Patients were treated with Michigan splints applied overnight for three months. Before (T1) and after three months of treatment (T2), patients were registered with an electronic ultrasound device with qualitative and quantitative evaluation of the registrations and a qualitative assessment of pain symptoms using a verbal analog scale. Significant differences were found between maximum mouth opening (MMP) (p < 0.001) and right condylar movement (CM) at MMP (p = 0.045). Qualitative assessment revealed that 24 of 29 patients experienced an improvement in pain symptoms, 17 of whom experienced complete remission. The results of the qualitative and quantitative analysis provide indications of the effectiveness of the splint therapy. In addition to quantitative measurements, the ultrasound facebow technique was also able to provide qualitative information.
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Affiliation(s)
- Bernhard Wiechens
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (T.H.); (T.W.); (N.G.); (R.B.)
- Department of Orthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany
- Correspondence:
| | - Svea Paschereit
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (T.H.); (T.W.); (N.G.); (R.B.)
| | - Tristan Hampe
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (T.H.); (T.W.); (N.G.); (R.B.)
| | - Torsten Wassmann
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (T.H.); (T.W.); (N.G.); (R.B.)
| | - Nikolaus Gersdorff
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (T.H.); (T.W.); (N.G.); (R.B.)
| | - Ralf Bürgers
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (T.H.); (T.W.); (N.G.); (R.B.)
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Bürgers R, Schubert A, Müller J, Krohn S, Rödiger M, Leha A, Wassmann T. Cytotoxicity of 3D‐printed, milled, and conventional oral splint resins to L929 cells and human gingival fibroblasts. Clin Exp Dent Res 2022; 8:650-657. [PMID: 35570327 PMCID: PMC9209804 DOI: 10.1002/cre2.592] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 05/01/2022] [Indexed: 11/22/2022] Open
Abstract
Objectives Evidence on the biocompatibility of three‐dimensional (3D)‐printed and milled resins for oral splints is limited. This in vitro study assessed the influence of the manufacturing method on the cytotoxicity of oral splint resins on L929 cells and human gingival fibroblasts (GF1). Materials and Methods Standardized specimens of four 3D‐printed, two‐milled, one‐thermoformed, and one‐pressed splint resin were incubated with L929 and GF1 cells for 24 h. Immunofluorescence and WST‐8 assay were performed to evaluate cytotoxic effects. One‐way analysis of variance and Tukey's multiple comparison test were applied with the variables “splint resin” and “manufacturing method” (p < .05). Results Immunofluorescence showed attachment of L929 and GF1 cells to the splint resins. Irrespective of the manufacturing method, the WST‐8 assay revealed significant differences between splint resins for the viability of L929 and GF1 cells. L929 cells generally showed lower viability rates than GF1 cells. The evaluation of cell viability by the manufacturing method showed no significant differences between 3D printing, milling, and conventional methods. Conclusions The cytotoxic effects of 3D‐printed, milled, and conventional oral splint resins were similar, indicating minor influence of the manufacturing method on biocompatibility. Cytotoxicity of the resins was below a critical threshold in GF1 cells. The chemical composition might be more crucial than the manufacturing method for the biocompatibility of splint resins.
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Affiliation(s)
- Ralf Bürgers
- Department of ProsthodonticsUniversity Medical Center GöttingenGöttingenGermany
| | - Andrea Schubert
- Department of ProsthodonticsUniversity Medical Center GöttingenGöttingenGermany
| | - Jonas Müller
- Department of ProsthodonticsUniversity Medical Center GöttingenGöttingenGermany
| | - Sebastian Krohn
- Department of ProsthodonticsUniversity Medical Center GöttingenGöttingenGermany
| | - Matthias Rödiger
- Department of ProsthodonticsUniversity Medical Center GöttingenGöttingenGermany
| | - Andreas Leha
- Department of Medical StatisticsUniversity Medical Center GöttingenGöttingenGermany
| | - Torsten Wassmann
- Department of ProsthodonticsUniversity Medical Center GöttingenGöttingenGermany
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Hampe T, Wiessner A, Frauendorf H, Alhussein M, Karlovsky P, Bürgers R, Krohn S. Monomer Release from Dental Resins: The Current Status on Study Setup, Detection and Quantification for In Vitro Testing. Polymers (Basel) 2022; 14:polym14091790. [PMID: 35566958 PMCID: PMC9100225 DOI: 10.3390/polym14091790] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 04/23/2022] [Accepted: 04/25/2022] [Indexed: 02/04/2023] Open
Abstract
Improvements in mechanical properties and a shift of focus towards esthetic dentistry led to the application of dental resins in various areas of dentistry. However, dental resins are not inert in the oral environment and may release monomers and other substances such as Bisphenol-A (BPA) due to incomplete polymerization and intraoral degradation. Current research shows that various monomers present cytotoxic, genotoxic, proinflammatory, and even mutagenic effects. Of these eluting substances, the elution of BPA in the oral environment is of particular interest due to its role as an endocrine disruptor. For this reason, the release of residual monomers and especially BPA from dental resins has been a cause for public concern. The assessment of patient exposure and potential health risks of dental monomers require a reliable experimental and analytical setup. However, the heterogeneous study design applied in current research hinders biocompatibility testing by impeding comparative analysis of different studies and transfer to the clinical situation. Therefore, this review aims to provide information on each step of a robust experimental and analytical in vitro setup that allows the collection of clinically relevant data and future meta-analytical evaluations.
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Affiliation(s)
- Tristan Hampe
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany; (A.W.); (R.B.); (S.K.)
- Correspondence:
| | - Andreas Wiessner
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany; (A.W.); (R.B.); (S.K.)
| | - Holm Frauendorf
- Institute for Organic and Biomolecular Chemistry, University of Göttingen, 37077 Göttingen, Germany;
| | - Mohammad Alhussein
- Molecular Phytopathology and Mycotoxin Research, University of Göttingen, 37077 Göttingen, Germany; (M.A.); (P.K.)
| | - Petr Karlovsky
- Molecular Phytopathology and Mycotoxin Research, University of Göttingen, 37077 Göttingen, Germany; (M.A.); (P.K.)
| | - Ralf Bürgers
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany; (A.W.); (R.B.); (S.K.)
| | - Sebastian Krohn
- Department of Prosthodontics, University Medical Center Göttingen, 37075 Göttingen, Germany; (A.W.); (R.B.); (S.K.)
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Hampe T, Wiessner A, Frauendorf H, Alhussein M, Karlovsky P, Bürgers R, Krohn S. A comparative in vitro study on monomer release from bisphenol A-free and conventional temporary crown and bridge materials. Eur J Oral Sci 2021; 129:e12826. [PMID: 34879174 DOI: 10.1111/eos.12826] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 08/02/2021] [Indexed: 11/25/2022]
Abstract
This study aimed to investigate the release of common monomers from two conventional and two bisphenol A (BPA)-free temporary crown and bridge materials. Cylindrical samples of all materials were prepared (N = 90; five samples for each material and cycle of analysis). All samples were immersed in high-performance liquid chromatography (HPLC)-grade water and incubated for 1 h, 12 h, 24 h, and 7 days in an incubation shaker at 37°C and 112 rpm. Extraction was performed in accordance with ISO 10993-12. Eluted monomers were detected and quantified by HPLC coupled with ultraviolet-visible spectroscopy and mass spectrometry (HPLC-UV/Vis-MS). Analysis of BPA was performed by HPLC coupled with ultraviolet-visible spectroscopy (HPLC-UV/Vis) and positive results were verified by HPLC-tandem mass spectrometry (HPLC-MS/MS). Neither bisphenol A-glycidyl methacrylate (Bis-GMA) nor BPA was quantifiable in any of the crown and bridge samples investigated in the present study. However, all samples contained triethylene glycol dimethacrylate (TEGDMA) and/or urethane dimethacrylate (UDMA) after 24 h of incubation. Statistical analysis showed that significantly more UDMA was released from the BPA-free materials than from the conventional materials. All concentrations of UDMA measured were below the effective cytotoxic concentrations previously reported. However, for a few materials, especially BPA-free temporary crown and bridge materials, the levels of UDMA were above previously reported potentially harmful concentrations for local cells. As BPA-free materials were introduced as being more biocompatible than materials containing BPA, substitution of Bis-GMA with UDMA should be further investigated.
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Affiliation(s)
- Tristan Hampe
- Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Andreas Wiessner
- Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Holm Frauendorf
- Institute for Organic and Biomolecular Chemistry, University of Göttingen, Göttingen, Germany
| | - Mohammad Alhussein
- Molecular Phytopathology and Mycotoxin Research, University of Göttingen, Göttingen, Germany
| | - Petr Karlovsky
- Molecular Phytopathology and Mycotoxin Research, University of Göttingen, Göttingen, Germany
| | - Ralf Bürgers
- Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Sebastian Krohn
- Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
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Schubert A, Bürgers R, Baum F, Kurbad O, Wassmann T. Influence of the Manufacturing Method on the Adhesion of Candida albicans and Streptococcus mutans to Oral Splint Resins. Polymers (Basel) 2021; 13:polym13101534. [PMID: 34064561 PMCID: PMC8150722 DOI: 10.3390/polym13101534] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 05/05/2021] [Accepted: 05/06/2021] [Indexed: 02/07/2023] Open
Abstract
Microbial adhesion to oral splints may lead to oral diseases such as candidiasis, periodontitis or caries. The present in vitro study aimed to assess the effect of novel computer-aided design/computer-aided manufacturing (CAD/CAM) and conventional manufacturing on Candida albicans and Streptococcus mutans adhesion to oral splint resins. Standardized specimens of four 3D-printed, two milled, one thermoformed and one pressed splint resin were assessed for surface roughness by widefield confocal microscopy and for surface free energy by contact angle measurements. Specimens were incubated with C. albicans or S. mutans for two hours; a luminometric ATP assay was performed for the quantification of fungal and bacterial adhesion. Both one-way ANOVA with Tukey post hoc testing and Pearson correlation analysis were performed (p < 0.05) in order to relate manufacturing methods, surface roughness and surface free energy to microbial adhesion. Three-dimensional printing and milling were associated with increased adhesion of C. albicans compared to conventional thermoforming and pressing, while the S. mutans adhesion was not affected. Surface roughness and surface free energy showed no significant correlation with microbial adhesion. Increased fungal adhesion to oral splints manufactured by 3D printing or milling may be relevant for medically compromised patients with an enhanced risk for developing candidiasis.
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Krohn S, Frahm J, Mahler A, Dathe H, Sedaghat S, Kubein-Meesenburg D, Linss F, Wassmann T, Bürgers R. Biomechanical analysis of temporomandibular joint dynamics based on real-time magnetic resonance imaging. Int J Comput Dent 2020; 23:235-244. [PMID: 32789311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
AIM The traditional hinge axis theory of temporomandibular joint (TMJ) dynamics is increasingly being replaced by the theory of instantaneous centers of rotation (ICR). Typically, ICR determinations are based on theoretical calculations or three-dimensional approximations of finite element models. MATERIALS AND METHODS With the advent of real-time magnetic resonance imaging (MRI), natural physiologic movements of the TMJ may be visualized with 15 frames per second. The present study employs real-time MRI to analyze the TMJ biomechanics of healthy volunteers during mandibular movements, with a special emphasis on horizontal condylar inclination (HCI) and ICR pathways. The Wilcoxon rank sum test was used to comparatively analyze ICR pathways of mandibular opening and closure. RESULTS Mean HCI was 34.8 degrees (± 11.3 degrees) and mean mandibular rotation was 26.6 degrees (± 7.2 degrees). Within a mandibular motion of 10 to 30 degrees, the resulting x- and y-translation during opening and closure of the mandible differed significantly (10 to 20 degrees, x: P = 0.02 and y: P < 0.01; 20 to 30 degrees, x: P < 0.001 and y: P = 0.01). Rotation of both 0 to 10 degrees and > 30 degrees showed no significant differences in x- and y-translation. Near occlusion movements differed only for y-translation (P < 0.01). CONCLUSION Real-time MRI facilitates the direct recording of TMJ structures during physiologic mandibular movements. The present findings support the theory of ICR. Statistics confirmed that opening and closure of the mandible follow different ICR pathways, which might be due to muscular activity discrepancies during different movement directions. ICR pathways were similar within maximum interincisal distance (MID) and near occlusion (NO), which might be explained by limited extensibility of tissue fibers (MID) and tooth contact (NO), respectively.
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Krohn S, Hampe T, Brack F, Wassmann T, Bürgers R. Intraoral sensor-based monitoring of stabilization splint therapy in patients with myofascial pain. Int J Comput Dent 2020; 23:11-16. [PMID: 32207457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
AIM The present study aimed to evaluate intraoral microsensors for the objective measurement of patient compliance during splint therapy and to comparatively analyze the duration of mandibular and maxillary splint application in patients with myofascial pain. MATERIALS AND METHODS Thirty-two patients with sole myofascial pain without limited opening (Research Diagnostic Criteria for Temporomandibular Disorders [RDC/TMD] Ia) were divided into two groups. To ensure patient comparability, all pressure-sensitive sites from the initial palpation were summarized as pain scores. The subjects in group 1 were treated with maxillary stabilization splints, and those in group 2 with mandibular stabilization splints. All splints were equipped with a microsensor without interfering static or dynamic occlusion. Wear pattern was recorded at three intervals of 30 days each. Following the observation period, the data were retrieved and statistically evaluated using multi-factor analysis of variance (ANOVA) and the Bland-Altman analysis. RESULTS During the observation period, maxillary splints were applied in 44.4% and mandibular splints in 44.2% of the days. Regarding patient compliance, there was no significant difference between the maxillary and mandibular splints (P = 0.359). Patients with an increased pain score (P < 0.0001) and female patients (P = 0.013) wore their splints significantly more often. The wear time decreased over the observation period, whereas only the initial and terminal interval differed significantly across both the mandibular and maxillary splint groups (P < 0.0001). CONCLUSION The microsensor used in the present study was an effective and reliable tool for monitoring patient compliance in patients with temporomandibular disorders (TMD). This method also allows for the reliable recording of intraoral splint application prior to the required bite elevations. The two types of splints analyzed in the present study had no significant influence on compliance.
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Bürgers R, Morsczeck C, Felthaus O, Gosau M, Beck HC, Reichert TE. Correction to: Induced surface proteins of Staphylococcus epidermidis adhering to titanium implant substrata. Clin Oral Investig 2019; 23:3139. [PMID: 30915556 DOI: 10.1007/s00784-019-02879-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
There is a mistake in the original published version of this article. The word 'Streptococcus' in the article title should have been 'Staphylococcus'.
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Affiliation(s)
- R Bürgers
- Department of Prosthodontics, UniversityMedical Center Göttingen, Robert-Koch-Strasse 40, 37075, Göttingen, Germany.
| | - C Morsczeck
- Department of Oral and Maxillofacial Surgery, University Hospital, Regensburg, Franz-Josef Strauss Allee 11, 93053, Regensburg, Germany
| | - O Felthaus
- Department of Oral and Maxillofacial Surgery, University Hospital, Regensburg, Franz-Josef Strauss Allee 11, 93053, Regensburg, Germany
| | - M Gosau
- Department of Oral and Maxillofacial Surgery, University Hospital, Regensburg, Franz-Josef Strauss Allee 11, 93053, Regensburg, Germany
| | - H C Beck
- Department of Clinical Biochemistry and Pharmacology, Centre for Clinical Proteomics, Odense University Hospital, DK-5000, Odense, Denmark
| | - T E Reichert
- Department of Oral and Maxillofacial Surgery, University Hospital, Regensburg, Franz-Josef Strauss Allee 11, 93053, Regensburg, Germany
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Rödiger M, Kloß J, Gersdorff N, Bürgers R, Rinke S. Removal forces of adhesively and self-adhesively luted implant-supported zirconia copings depend on abutment geometry. J Mech Behav Biomed Mater 2018; 87:119-123. [DOI: 10.1016/j.jmbbm.2018.07.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 07/17/2018] [Accepted: 07/18/2018] [Indexed: 11/15/2022]
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Rinke S, Schneider L, Schulz X, Wiedemann V, Bürgers R, Rödiger M. Overdentures borne on less than four abutments with telescopic crowns: 5-year results of a retrospective clinical study. Clin Oral Investig 2018; 23:3153-3160. [PMID: 30377829 DOI: 10.1007/s00784-018-2734-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 10/23/2018] [Indexed: 11/26/2022]
Abstract
OBJECTIVE Retrospective evaluation of the clinical performance of tooth-supported overdentures retained by resilient telescopic crowns with occlusal clearance fit (ODRTC) in severely reduced dentition (1-3 remaining teeth). MATERIALS AND METHODS A total of 313 ODRTCs were inserted in an undergraduate prosthodontic program (University Medical Center, Goettingen, Germany) between 2000 und 2012. Data regarding 263 ODRTCs in 221 patients were reevaluated (observational period: 64.5 ± 34.8 months), and time-dependent survival and success rates (Kaplan-Meier-Estimator) were calculated. The number of the abutment teeth was analyzed as an influencing factor (Cox regression model (p < 0.05)). RESULTS The 5- and 8-year overdenture survival rates were 62% [CI: 0.55; 0.69] and 38% [CI: 0.30; 0.45]. The 5- and 8-year success-rates (biologically and technically event-free restorations) were 13% [CI: 0.09; 0.17] and 3% [CI: 0.01; 0.05]. On the abutment level, the 5- and 8-year survival rates were 55% [CI: 0.48; 0.62], and 34% [CI: 0.27; 0.42]. The number of abutment teeth significantly influenced the overdenture and abutment survival rates. Restorations with 1 or 2 abutments were significantly associated with an increased number of technical and biological complications (decementation of the primary crown, abutment fracture) compared to ODRTCs with 3 abutments. CONCLUSIONS The survival and success rates of ODRTCs are significantly influenced by the number of abutments. CLINICAL RELEVANCE For ODRTCs, reduced survival and success rates are expected, especially when only 1 or 2 abutment teeth are included.
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Affiliation(s)
- Sven Rinke
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Lea Schneider
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Xenia Schulz
- Department of Medical Statistics, Georg-August-University, Goettingen, Germany
| | - Vicky Wiedemann
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Ralf Bürgers
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Matthias Rödiger
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany.
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Rinke S, Wehle J, Schulz X, Bürgers R, Rödiger M. Prospective Evaluation of Posterior Fixed Zirconia Dental Prostheses: 10-Year Clinical Results. INT J PROSTHODONT 2018; 31:35-42. [PMID: 29316569 DOI: 10.11607/ijp.5283] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
PURPOSE To investigate the clinical survival and success rates of conventionally luted three- and four-unit fixed dental prostheses (FDPs) with zirconia frameworks (Cercon Smart Ceramics, DeguDent) after a mean observation period of 119 ± 36 months. MATERIALS AND METHODS A total of 75 patients were treated in the Department of Prosthodontics at the University of Goettingen, Germany, and a total of 99 posterior FDPs were inserted and luted with zinc phosphate cement. Time-dependent survival and success rates were calculated using Kaplan-Meier curves, and their relationships with the type of veneer (ceramic), location (maxilla vs mandible), and span length (three-unit vs four-unit) were analyzed with a Cox regression model (P < .05). RESULTS Of the 99 inserted FDPs, 24 were lost to follow-up, 51 remained functional and passed the 10-year examination (overall survival rate: 75.0%; 95% confidence interval [CI]: 0.64, 0.85), and 13 were absolute failures caused by technical events (technical survival rate: 84%; 95% CI: 0.64, 0.85). In 50 FDPs, relative failure required a clinical intervention to maintain function (overall success rate: 40%; 95% CI: 0.29, 0.52). For 35 of these FDPs, the relative failure was caused by technical events (technical success rate: 61%; 95% CI: 0.49, 0.73). None of the evaluated factors showed an association with overall or technical survival or success. CONCLUSION Zirconia-based posterior FDPs produced with a first-generation computer-assisted manufacturing (CAM) system revealed high rates of absolute and relative failure, mainly due to technical events, after a mean observational period of 10 years. Further clinical studies with updated computer-assisted design (CAD)/CAM systems are needed to determine the long-term performance of zirconia-based FDPs.
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Schubert A, Ziegler C, Bernhard A, Bürgers R, Miosge N. Cytotoxic effects to mouse and human gingival fibroblasts of a nanohybrid ormocer versus dimethacrylate-based composites. Clin Oral Investig 2018; 23:133-139. [DOI: 10.1007/s00784-018-2419-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 03/12/2018] [Indexed: 01/31/2023]
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Rödiger M, Heinitz A, Bürgers R, Rinke S. Fitting accuracy of zirconia single crowns produced via digital and conventional impressions-a clinical comparative study. Clin Oral Investig 2016; 21:579-587. [PMID: 27469102 DOI: 10.1007/s00784-016-1924-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 07/21/2016] [Indexed: 11/26/2022]
Abstract
OBJECTIVES This study focused on the clinical investigation of the internal and marginal fit of CAD/CAM-fabricated zirconia single crowns produced via conventional and digital impression techniques. MATERIALS AND METHODS In a private practice, 20 molar teeth, one from each of 20 patients, were prepared with a circumferential 1.0-mm deep chamfer and an occlusal reduction of 1.5 mm. Conventional impression (CI) taking with a polyvinylsiloxane material (Aquasil Monophase + Aquasil XLV; Dentsply, Konstanz, Germany) and intraoral scanning (IS) (Cara TRIOS; Heraeus, Hanau, Germany) of each of the preparations was performed, and then two respective zirconia copings per tooth were produced (20 crowns per group). The marginal and internal fit of the restorations was evaluated employing a replica technique. For statistical analysis, a pairwise comparison (Wilcoxon rank test) was performed. RESULTS Zirconia single crowns produced with the IS technique revealed a statistically significant better precision of internal fit only in specific areas (chamfer area/occlusal area). The evaluation of marginal fit showed no significant differences between the two groups. All restorations of both groups offered internal and marginal gaps within the postulated clinical tolerance ranges. CONCLUSIONS CAD/CAM-fabricated zirconia single crowns produced with CI and IS techniques offer adequate marginal and internal precision. However, the IS technique provides lower internal gaps in some specific areas. CLINICAL RELEVANCE The clinical precision of fit of restorations produced with a CI and an IS technique appeared to be equivalent. Therefore, the IS technique can be rated as a suitable alternative for the manufacturing of single crowns.
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Affiliation(s)
- Matthias Rödiger
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Arthur Heinitz
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Ralf Bürgers
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany
| | - Sven Rinke
- Department of Prosthodontics, University Medical Center Goettingen, Georg-August-University, Robert-Koch-Str. 40, 37075, Goettingen, Germany.
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Rinke S, Kramer K, Bürgers R, Roediger M. A practice-based clinical evaluation of the survival and success of metal-ceramic and zirconia molar crowns: 5-year results. J Oral Rehabil 2015; 43:136-44. [DOI: 10.1111/joor.12348] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/24/2015] [Indexed: 12/22/2022]
Affiliation(s)
- S. Rinke
- Private Practice; Hanau Germany
- Department of Prosthodontics; Georg-August-University; Göttingen Germany
| | - K. Kramer
- Department of Medical Statistics; Georg-August-University; Göttingen Germany
| | - R. Bürgers
- Department of Prosthodontics; Georg-August-University; Göttingen Germany
| | - M. Roediger
- Department of Prosthodontics; Georg-August-University; Göttingen Germany
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Abstract
Dental implants are one of the most frequently used treatment options for tooth replacement. Approximately 30% of patients with dental implants develop peri-implantitis, which is an oral inflammatory disease that leads to loss of the supporting tissues, predominately the bone. For the development of future therapeutic strategies, it is essential to understand the molecular pathophysiology of human dental peri-implant infections. Here, we describe the gene and protein expression patterns of peri-implantitis bone tissue compared with healthy peri-implant bone tissue. Furthermore, cells from the osteoblastic lineage derived from peri-implantitis samples were immortalized and characterized. We applied microarray, quantitative reverse transcription polymerase chain reaction, fluorescence-activated cell sorting, and Western blot analyses. The levels of typical bone matrix molecules, including SPP1, BGLAP, and COL9A1, in patients with peri-implantitis were reduced, while the inflammation marker interleukin 8 (IL8) was highly expressed. RUNX2, one of the transcription factors of mature osteoblasts, was also decreased in peri-implantitis. Finally, the human telomerase reverse transcriptase immortalized cell line from peri-implantitis exhibited a more fibro-osteoblastic character than did the healthy control.
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Affiliation(s)
- B Schminke
- Tissue Regeneration and Oral Biology Work Group, Department of Prosthodontics, Georg August University, Goettingen, Germany
| | - F Vom Orde
- Tissue Regeneration and Oral Biology Work Group, Department of Prosthodontics, Georg August University, Goettingen, Germany
| | - R Gruber
- Department of Oral and Maxillofacial Surgery, Georg August University, Goettingen, Germany
| | - H Schliephake
- Department of Oral and Maxillofacial Surgery, Georg August University, Goettingen, Germany
| | - R Bürgers
- Tissue Regeneration and Oral Biology Work Group, Department of Prosthodontics, Georg August University, Goettingen, Germany
| | - N Miosge
- Tissue Regeneration and Oral Biology Work Group, Department of Prosthodontics, Georg August University, Goettingen, Germany
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Raue L, Hartmann CD, Rödiger M, Bürgers R, Gersdorff N. Anisotropic local physical properties of human dental enamel in comparison to properties of some common dental filling materials. Acta Odontol Scand 2014; 72:591-6. [PMID: 24460030 DOI: 10.3109/00016357.2013.878391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE A major aspect in evaluating the quality of dental materials is their physical properties. Their properties should be a best fit of the ones of dental hard tissues. Manufacturers give data sheets for each material. The properties listed are characterized by a specific value. This assumes (but does not prove) that there is no direction dependence of the properties. However, dental enamel has direction-dependent properties which additionally vary with location in the tooth. The aim of this paper is to show the local direction dependence of physical properties like the elastic modulus or the thermal expansion in dental hard tissues. With this knowledge the 'perfect filling/dental material' could be characterized. MATERIALS AND METHOD Enamel sections of ∼400-500 μm thickness have been cut with a diamond saw from labial/buccal to palatal/lingual (canine, premolar and molar) and parallel to labial (incisor). Crystallite arrangements have been measured in over 400 data points on all types of teeth with x-ray scattering techniques, known from materials science. RESULTS X-ray scattering measurements show impressively that dental enamel has a strong direction dependence of its physical properties which also varies with location within the tooth. Dental materials possess only little or no property direction dependence. Therefore, a mismatch was found between enamel and dental materials properties. CONCLUSION Since dental materials should possess equal (direction depending) properties, worthwhile properties could be characterized by transferring the directional properties of enamel into a property 'wish list' which future dental materials should fulfil. Hereby the 'perfect dental material' can be characterized.
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Affiliation(s)
- Lars Raue
- Department of Prosthodontics, Center for Dentistry, Oral Medicine and Craniomaxillofacial Surgery, University Clinical Center, Georg-August-University , Goettingen , Germany
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Rödiger M, Rinke S, Ehret-Kleinau F, Pohlmeyer F, Lange K, Bürgers R, Gersdorff N. Evaluation of removal forces of implant-supported zirconia copings depending on abutment geometry, luting agent and cleaning method during re-cementation. J Adv Prosthodont 2014; 6:233-40. [PMID: 25006388 PMCID: PMC4085248 DOI: 10.4047/jap.2014.6.3.233] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 06/03/2014] [Accepted: 06/11/2014] [Indexed: 12/15/2022] Open
Abstract
PURPOSE To evaluate the effects of different abutment geometries in combination with varying luting agents and the effectiveness of different cleaning methods (prior to re-cementation) regarding the retentiveness of zirconia copings on implants. MATERIALS AND METHODS Implants were embedded in resin blocks. Three groups of titanium abutments (pre-fabricated, height: 7.5 mm, taper: 5.7°; customized-long, height: 6.79 mm, taper: 4.8°; customized-short, height: 4.31 mm, taper: 4.8°) were used for luting of CAD/CAM-fabricated zirconia copings with a semi-permanent (Telio CS) and a provisional cement (TempBond NE). Retention forces were evaluated using a universal testing machine. Furthermore, the influence of cleaning methods (manually, manually in combination with ultrasonic bath or sandblasting) prior to re-cementation with a provisional cement (TempBond NE) was investigated with the pre-fabricated titanium abutments (height: 7.5 mm, taper: 5.7°) and SEM-analysis of inner surfaces of the copings was performed. Significant differences were determined via two-way ANOVA. RESULTS Significant interactions between abutment geometry and luting agent were observed. TempBond NE showed the highest level of retentiveness on customized-long abutments, but was negatively affected by other abutment geometries. In contrast, luting with Telio CS demonstrated consistent results irrespective of the varying abutment geometries. Manual cleaning in combination with an ultrasonic bath was the only cleaning method tested prior to re-cementation that revealed retentiveness levels not inferior to primary cementation. CONCLUSION No superiority for one of the two cements could be demonstrated because their influences on retentive strength are also depending on abutment geometry. Only manual cleaning in combination with an ultrasonic bath offers retentiveness levels after re-cementation comparable to those of primary luting.
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Affiliation(s)
- Matthias Rödiger
- Department of Prosthodontics, School of Dentistry, University Medical Center Goettingen, Goettingen, Germany
| | - Sven Rinke
- Department of Prosthodontics, School of Dentistry, University Medical Center Goettingen, Goettingen, Germany
| | - Fenja Ehret-Kleinau
- Department of Prosthodontics, School of Dentistry, University Medical Center Goettingen, Goettingen, Germany
| | - Franziska Pohlmeyer
- Department of Prosthodontics, School of Dentistry, University Medical Center Goettingen, Goettingen, Germany
| | - Katharina Lange
- Department of Medical Statistics, University Medical Center Goettingen, Goettingen, Germany
| | - Ralf Bürgers
- Department of Prosthodontics, School of Dentistry, University Medical Center Goettingen, Goettingen, Germany
| | - Nikolaus Gersdorff
- Department of Prosthodontics, School of Dentistry, University Medical Center Goettingen, Goettingen, Germany
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Winkler C, Schäfer L, Felthaus O, Allerdings J, Hahnel S, Behr M, Bürgers R. The bacterial adhesion on and the cytotoxicity of various dental cements used for implant-supported fixed restorations. Acta Odontol Scand 2014; 72:241-50. [PMID: 24074394 DOI: 10.3109/00016357.2013.828320] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
OBJECTIVE Bacterial adhesion on and cytotoxicity of eight luting agents used for implant-supported restorations were investigated. MATERIALS AND METHOD Surface roughness (Ra), surface free energy (SFE) values and three-dimensional images by atomic-force microscopy of circular specimens were determined. Bacterial suspensions of Streptococcus sanguinis and Streptococcus epidermidis were incubated at 37°C for 2 h. Adhering bacteria were examined with fluorescence dye CytoX-Violet, stained with 4',6-diamidino-2-phenylindole (DAPI) and visualized by fluorescence-microscopy. Cytotoxicity-testing was done with WST-1-tests (water soluble tetrazolium). No significant differences, neither with regard to Ra nor regarding SFE were determined. RESULTS Adherence of S. sanguinis was less on titanium, TempBondNE and TempBond. TempBond, TempBondNE, RelyX Unicem and Implantlink Semi Classic presented low amounts of S. epidermidis. WST-testing showed high cytotoxic potential of Harvard, Aqualox, TempBondNE and TempBond. No combination of low adherent bacteria with low cytotoxicity was found. CONCLUSION From a biological in-vitro perspective, none of the cements may be recommended for implant-supported restorations.
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Koch C, Bürgers R, Hahnel S. Candida albicansadherence and proliferation on the surface of denture base materials. Gerodontology 2013; 30:309-13. [DOI: 10.1111/ger.12056] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/07/2013] [Indexed: 11/30/2022]
Affiliation(s)
- Carola Koch
- Department of Prosthetic Dentistry; University Medical Center Regensburg; Regensburg Germany
| | - Ralf Bürgers
- Department of Prosthetic Dentistry; University Medical Center Regensburg; Regensburg Germany
| | - Sebastian Hahnel
- Department of Prosthetic Dentistry; University Medical Center Regensburg; Regensburg Germany
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Schminke B, Muhammad H, Bode C, Sadowski B, Gerter R, Gersdorff N, Bürgers R, Monsonego-Ornan E, Rosen V, Miosge N. A discoidin domain receptor 1 knock-out mouse as a novel model for osteoarthritis of the temporomandibular joint. Cell Mol Life Sci 2013; 71:1081-96. [PMID: 23912900 DOI: 10.1007/s00018-013-1436-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Revised: 07/19/2013] [Accepted: 07/22/2013] [Indexed: 11/25/2022]
Abstract
Discoidin domain receptor 1 (DDR-1)-deficient mice exhibited a high incidence of osteoarthritis (OA) in the temporomandibular joint (TMJ) as early as 9 weeks of age. They showed typical histological signs of OA, including surface fissures, loss of proteoglycans, chondrocyte cluster formation, collagen type I upregulation, and atypical collagen fibril arrangements. Chondrocytes isolated from the TMJs of DDR-1-deficient mice maintained their osteoarthritic characteristics when placed in culture. They expressed high levels of runx-2 and collagen type I, as well as low levels of sox-9 and aggrecan. The expression of DDR-2, a key factor in OA, was increased. DDR-1-deficient chondrocytes from the TMJ were positively influenced towards chondrogenesis by a three-dimensional matrix combined with a runx-2 knockdown or stimulation with extracellular matrix components, such as nidogen-2. Therefore, the DDR-1 knock-out mouse can serve as a novel model for temporomandibular disorders, such as OA of the TMJ, and will help to develop new treatment options, particularly those involving tissue regeneration.
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Affiliation(s)
- Boris Schminke
- Oral Biology and Tissue Regeneration Work Group, Department of Prosthodontics, Medical Faculty, Georg-August-University, Robert Koch Straße 40, 37075, Goettingen, Germany
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Abstract
Staphylococcus epidermidis plays a major role in capsular contractures of silicone breast implants. This in vitro study evaluates the antibacterial effect of copper on S. epidermidis in silicone implants. Specimens of a silicone material used for breast augmentation (Cu0) and specimens coated with different copper concentrations (Cu1, Cu2) were artificially aged. Surface roughness and surface free energy were assessed. The specimens were incubated in an S. epidermidis suspension. We assessed the quantification and the viability of adhering bacteria by live/dead cell labeling with fluorescence microscopy. Additionally, inhibition of bacterial growth was evaluated by agar diffusion, broth culture, and quantitative culture of surface bacteria. No significant differences in surface roughness and surface free energy were found between Cu0, Cu1 and Cu2. Aging did not change surface characteristics and the extent of bacterial adhesion. Fluorescence microscopy showed that the quantity of bacteria on Cu0 was significantly higher than that on Cu1 and Cu2. The ratio of dead to total adhering bacteria was significantly lower on Cu0 than on Cu1 and Cu2, and tended to be higher for Cu2 than for Cu1. Quantitative culture showed equal trends. Copper additives seem to have anti-adherence and bactericidal effects on S. epidermidis in vitro.
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Affiliation(s)
- Martin Gosau
- Department of Cranio-Maxillo-Facial Surgery, University Medical Center Regensburg, Germany
| | - Ralf Bürgers
- Department of Prosthetic Dentistry, University Medical Center Regensburg, Germany
| | - Tobias Vollkommer
- Department of Cranio-Maxillo-Facial Surgery, University Medical Center Regensburg, Germany
| | - Thomas Holzmann
- Institute for Medical Microbiology and Hygiene, University Medical Center Regensburg, Germany
| | - Lukas Prantl
- Department of Trauma and Plastic Surgery, University Medical Center Regensburg, Germany
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Hahnel S, Mühlbauer G, Hoffmann J, Ionescu A, Bürgers R, Rosentritt M, Handel G, Häberlein I. Streptococcus mutans and Streptococcus sobrinus biofilm formation and metabolic activity on dental materials. Acta Odontol Scand 2012; 70:114-21. [PMID: 21780966 DOI: 10.3109/00016357.2011.600703] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES To examine potential correlations between streptococcal biofilm formation and lactate production in streptococcal biofilms formed on the surface of dental materials with different surface characteristics. MATERIALS AND METHODS Samples of a glass-ionomer cement (Ketac Molar) and a ceramic (Empress 2) were incubated with whole saliva and suspensions of Streptococcus mutans ATCC 25175 or Streptococcus sobrinus ATCC 33478 for initiating single-species biofilm formation for either 4 or 24 h. The relative amount of adherent, viable cells was determined using a Resazurin and a MTT assay. Metabolic activity was assessed by quantifying lactate production with a modification of the commercial Clinpro Cario L-Pop kit. RESULTS Both assays identified similar S. sobrinus biofilm formation on the two substrata; for S. mutans, the MTT test showed significantly fewer streptococci on the glass-ionomer cement than on the ceramic. Concerning metabolic activity, for S. sobrinus, significantly higher lactate production was observed for biofilms formed on the glass-ionomer cement in comparison to the ceramic, whereas similar values were identified for S. mutans. CONCLUSIONS Within the limitations of the study, the results suggest that the pure amount of adherent streptococci does not a priori indicate the metabolic activity of the cariogenic bacteria organized in the respective biofilm. Thus, comparisons between the relative amount of adherent streptococci and their metabolic activity may allow for an improved understanding of the effect of dental material surfaces on the formation and metabolic activity of streptococcal biofilms.
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Affiliation(s)
- Sebastian Hahnel
- Department of Prosthetic Dentistry, Regensburg University Medical Center, Regensburg, Germany.
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Behr M, Hahnel S, Faltermeier A, Bürgers R, Kolbeck C, Handel G, Proff P. The two main theories on dental bruxism. Ann Anat 2012; 194:216-9. [DOI: 10.1016/j.aanat.2011.09.002] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Revised: 09/11/2011] [Accepted: 09/13/2011] [Indexed: 11/26/2022]
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Bürgers R, Witecy C, Hahnel S, Gosau M. The effect of various topical peri-implantitis antiseptics on Staphylococcus epidermidis, Candida albicans, and Streptococcus sanguinis. Arch Oral Biol 2012; 57:940-7. [PMID: 22365324 DOI: 10.1016/j.archoralbio.2012.01.015] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Revised: 01/17/2012] [Accepted: 01/28/2012] [Indexed: 10/28/2022]
Abstract
OBJECTIVE Although peri-implantitis has presented an ever increasing problem in modern dentistry, satisfying therapeutic strategies or scientifically based treatment recommendations are still not available. The main object of the present study was to evaluate the antibacterial efficacy of six different topical antiseptics on three test microorganisms attached to titanium implant specimens. MATERIAL AND METHODS For biofilm formation, plane titan specimens were incubated either in Candida albicans, Streptococcus sanguinis, or Staphylococcus epidermidis for 2h. The specimens were then treated with different topical antiseptics for 60s (sodium hypochlorite 1.0%, hydrogen peroxide 3.0%, chlorhexidine gluconate 0.2%, citric acid 40.0%, Plax, or Listerine) and with sterile saline as control. Remaining vital fungi were quantified by means of a bioluminometric assay and the bacterial load and the viability of adhering S. epidermidis and S. sanguinis by live or dead cell labelling in combination with fluorescence microscopy. RESULTS Sodium hypochlorite was effective against all three species, whereas hydrogen peroxide was solely effective against C. albicans. CHX and Listerine showed antimicrobial activity against S. sanguinis and C. albicans and citric acid and Plax against both tested bacteria. CONCLUSIONS None of the tested antimicrobial agents, except for sodium hypochlorite, showed a significant in vitro effect on all three test microbes. Considering the possible toxicity of sodium hypochlorite, none of the tested - and so far widely used - antiseptics showed any broad-spectrum antimicrobial effect and could therefore not be recommended for the topical disinfection and detoxification of infected implant surfaces.
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Affiliation(s)
- Ralf Bürgers
- Department of Prosthetic Dentistry, University Hospital Regensburg, Regensburg, Germany.
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Zorzin J, Bürgers R, Rosentritt M, Bechert T, Steinrücke P, Konradt T, Petschelt A, Frankeberger R. Microsilver loaded adhesives: Antimicrobial activity and microtensile bond strength. Dent Mater 2012. [DOI: 10.1016/j.dental.2012.07.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Behr M, Meier S, Hahnel S, Bürgers R, Handel G, Rosentritt M. Glass ionomer layer thickness and its influence on zirconia failure. J Mech Behav Biomed Mater 2011; 4:1567-70. [DOI: 10.1016/j.jmbbm.2011.05.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Revised: 05/10/2011] [Accepted: 05/11/2011] [Indexed: 11/25/2022]
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Vielsmeier V, Kleinjung T, Strutz J, Bürgers R, Kreuzer PM, Langguth B. Tinnitus with temporomandibular joint disorders: a specific entity of tinnitus patients? Otolaryngol Head Neck Surg 2011; 145:748-52. [PMID: 21705788 DOI: 10.1177/0194599811413376] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Tinnitus is frequently associated with temporomandibular joint (TMJ) dysfunction. However, the nature of the relationship is not fully understood. Here the authors compared 30 patients with a confirmed diagnosis of temporomandibular joint dysfunction and tinnitus to a group of 61 patients with tinnitus but without any subjective complaints of TMJ dysfunction with respect to clinical and demographic characteristics. STUDY DESIGN Case-control study. SETTING Tertiary referral center. SUBJECTS Tinnitus patients with and without TMJ dysfunction presenting at the Department of Prosthetic Dentistry and th: Tinnitus Clinic at the University of Regensburg. RESULTS Tinnitus patients with TMJ disorder had better hearing function (P < .0005), lower age (P = .001), and lower age at tinnitus onset (P = .002) and were more frequently female (P = .003). Their subjectively perceived tinnitus loudness was lower (P = .01), and more of them could modulate their tinnitus by jaw or neck movements (P = .001). CONCLUSION Classical risk factors for tinnitus (age, male gender, hearing loss) are less relevant in tinnitus patients with TMJ disorder, suggesting a causal role of TMJ pathology in the generation and maintenance of tinnitus. Based on this finding, treatment of TMJ disorder may represent a causally oriented treatment strategy for tinnitus.
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Affiliation(s)
- Veronika Vielsmeier
- Department of Otorhinolaryngology, University of Regensburg, Regensburg, Germany.
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Hahnel S, Rosentritt M, Bürgers R, Handel G, Lang R. Candida albicans biofilm formation on soft denture liners and efficacy of cleaning protocols. Gerodontology 2011; 29:e383-91. [DOI: 10.1111/j.1741-2358.2011.00485.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Hahnel S, Henrich A, Bürgers R, Handel G, Rosentritt M. Investigation of mechanical properties of modern dental composites after artificial aging for one year. Oper Dent 2010; 35:412-9. [PMID: 20672725 DOI: 10.2341/09-337-l] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This in vitro study investigated the aging behavior of dental composites with regard to surface roughness (SR), Vickers hardness (VH) and flexural strength (FS), and the study elucidated the impact of artificial aging parameters. One hundred and sixty-five rectangular specimens were prepared from five composites (Filtek Supreme XT, Filtek Silorane, CeramX, Quixfil, experimental ormocer) and subjected to various artificial aging protocols (storage in distilled water/ethanol/artificial saliva for 7, 90 and 365 days; thermal cycling, 2 x 3000 cycles 5/55 degrees C). SR, VH and FS were determined at baseline and after each aging treatment. Means and standard deviations were calculated; statistical analysis was performed using three-way ANOVA and the Tukey-Kramer multiple comparison test (alpha=.05). The results showed a significant influence in the composite and aging duration on mechanical parameters; the aging medium did not have a significant influence on VH and FS, but there was a significant influence on SR. The highest overall VH was found for theexperimental ormocer; Filtek Silorane yielded the lowest values. For FS, the significantly highest values were found for Filtek Silorane, and the lowest values were found for the experimental ormocer. Prolonged aging periods (90 or 365 days) or thermal cycling led to significant decreases in both VH and FS and significant increases in SR. The findings of the current study indicate that composites differ significantly for SR and its mechanical properties with regard to FS and VH, as well as in aging behavior. Generally, artificial aging leads to a significant decrease in mechanical properties, which underlines the relevance of continuous improvement of dental composites.
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Affiliation(s)
- Sebastian Hahnel
- Department of Prosthetic Dentistry, University Medical Center Regensburg, Regensburg, Germany.
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36
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Gosau M, Hahnel S, Schwarz F, Gerlach T, Reichert TE, Bürgers R. Effect of six different peri-implantitis disinfection methods onin vivohuman oral biofilm. Clin Oral Implants Res 2010; 21:866-72. [DOI: 10.1111/j.1600-0501.2009.01908.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Hahnel S, Henrich A, Rosentritt M, Handel G, Bürgers R. Influence of artificial ageing on surface properties and Streptococcus mutans adhesion to dental composite materials. J Mater Sci Mater Med 2010; 21:823-833. [PMID: 19830528 DOI: 10.1007/s10856-009-3894-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2009] [Accepted: 10/02/2009] [Indexed: 05/28/2023]
Abstract
The aim of this in vitro study was to investigate the influence of artificial ageing on the surface properties and early Streptococcus mutans adhesion to current dental composites for the direct restoration of class II defects. Three hundred and thirty specimens each were prepared from five dental composites, and were randomly allotted to various artificial ageing protocols (storage in distilled water/ethanol/artificial saliva for 7/90/365 days; thermal cycling, 6,000 cycles 5/55 degrees C). Prior and after each treatment, surface roughness (R(a)) and hydrophobicity were determined, and S. mutans adhesion (ATCC 25175; 2.5 h, 37 degrees C) was simulated with and without prior exposition to human whole saliva (2 h, 37 degrees C). Adherence of S. mutans was determined fluorometrically. Means and standard deviations were calculated, and analyzed using three-way ANOVA and post-hoc analysis (alpha = 0.05). For both R(a) and S. mutans adherence to uncoated and saliva-coated specimens, significant influences of the composite material, the ageing medium and the ageing duration have been observed; for surface hydrophobicity, significant influences of the composite material and the ageing duration were found. For uncoated specimens, significant increases in S. mutans adhesion were observed with prolonged artificial ageing, whereas significant decreases in S. mutans adhesion were found for the saliva-coated specimens. The data indicate influences of the artificial ageing method on surface parameters such as R(a) and hydrophobicity as well as microbial adhesion. The results underline the relevance of saliva coating on the outcome of studies simulating microbial adhesion, and highlight differences in the susceptibility of dental composites for the adhesion of oral bacteria.
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Affiliation(s)
- Sebastian Hahnel
- Department of Prosthetic Dentistry, University Medical Center Regensburg, 93042, Regensburg, Germany.
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Müller S, Bürgers R, Ehrenfeld M, Gosau M. Macroplate fixation of fractures of the edentulous atrophic mandible: immediate function and masticatory rehabilitation. Clin Oral Investig 2010; 15:151-6. [PMID: 20066447 DOI: 10.1007/s00784-009-0375-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2009] [Accepted: 12/14/2009] [Indexed: 11/30/2022]
Abstract
The present study aimed at evaluating the treatment outcome of fractures of the edentulous atrophic mandible by means of an extraoral approach using open reduction and internal fixation with macroplates. Eighteen patients with 21 fractures of the atrophic mandible, who had been treated between 1997 and 2006, were retrospectively analysed. Mandible height was categorised according to the Luhr classification and the patients' general health (The American Society of Anesthesiologists (ASA) classification). Three types of titanium macroplates were used. Demographic data, treatment outcomes and the pre- and postoperative ability to wear mandible dentures were evaluated. The study population consisted of five men and 13 women with a median age of 78 years. The mean follow-up duration was 28 months. The most common cause of fractures was accidental falls (50%); the mandible was affected in 77.8%. Three fractures occurred in class I (bone height 15-20 mm), seven in class II (10-15 mm), and 11 in class III atrophy (<10 mm). According to the ASA classification, the collective showed a mean value of 3. An overall complication rate of 16.7% was noted, consisting of two minor and one major complication that required a second intervention. Five patients needed removal of the osteosynthesis material for prosthetic reasons. Only 50% of the patients were able to wear their dentures before surgery, and all but one were able to wear their prosthesis postoperatively. Treatment of atrophic mandible fractures with macroplates by means of an extraoral approach showed good results and a low complication rate. This procedure allows elderly patients to instantly load the mandible in the means of prosthetic and masticatory rehabilitation, preventing the necessity for second interventions.
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Affiliation(s)
- Steffen Müller
- Department of Oral and Maxillofacial Surgery, Technical University Munich, Munich, Germany
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Rosentritt M, Behr M, Bürgers R, Feilzer AJ, Hahnel S. In vitroadherence of oralstreptococcito zirconia core and veneering glass-ceramics. J Biomed Mater Res B Appl Biomater 2009; 91:257-63. [DOI: 10.1002/jbm.b.31397] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Hahnel S, Rosentritt M, Handel G, Bürgers R. Surface characterization of dental ceramics and initial streptococcal adhesion in vitro. Dent Mater 2009; 25:969-75. [DOI: 10.1016/j.dental.2009.02.003] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2008] [Revised: 02/02/2009] [Accepted: 02/12/2009] [Indexed: 10/21/2022]
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Hahnel S, Leyer A, Rosentritt M, Handel G, Bürgers R. Surface properties and in vitro Streptococcus mutans adhesion to self-etching adhesives. J Adhes Dent 2009; 11:263-269. [PMID: 19701506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
PURPOSE The aim of this in vitro study was to investigate the surface properties and in vitro adhesion of Streptococcus mutans to dental self-etching two-step adhesives using an artificial mouth system. MATERIALS AND METHODS Carriers of a denture base resin supplemented with hydroxyapatite were manufactured, polished, and surface treated with various two-step self-etching dental adhesives (Clearfil Protect Bond, Silorane System Adhesive, Adper Scotchbond SE) according to the manufacturers' instructions. For each adhesive, 14 samples were inserted in an artificial mouth system and successively rinsed with mucin solutions (2 h) and Streptococcus mutans NCTC 10449 suspension (4 h). Surface free energy of the specimens was determined before and after mucin coating. The amount of adhered bacteria was quantified using a fluorescent dye (Resazurin/Alamar Blue) for viable cell quantification. RESULTS Before mucin coating, significant differences in surface free energies were found between the various adhesives, with total surface free energies ranging from 34.26 mJ/m(-2) to 42.30 mJ/m(-2). Mucin coating clearly levelled surface free energy differences. Significantly lower fluorescence intensities, indicating lower adhesion of Streptococcus mutans, were found for Silorane System Adhesive than for Clearfil Protect Bond and Adper Scotchbond SE, regardless of mucin coating. DISCUSSION The findings of this in vitro study indicate that the initial adhesion of Streptococcus mutans is lower to Silorane System Adhesive than to Clearfil Protect Bond or Adper Scotchbond SE. Our data correlated with the common thermodynamic approaches explaining streptococcal adherence to solid surfaces.
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Affiliation(s)
- Sebastian Hahnel
- Department of Prosthetic Dentistry, Regensburg University Medical Center, Regensburg, Germany.
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Hahnel S, Behr M, Handel G, Bürgers R. Saliva substitutes for the treatment of radiation-induced xerostomia--a review. Support Care Cancer 2009; 17:1331-43. [PMID: 19495809 DOI: 10.1007/s00520-009-0671-x] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2008] [Accepted: 05/21/2009] [Indexed: 11/28/2022]
Abstract
GOAL The aim of this review is to summarize the in vitro and in vivo evidence on the performance of contemporary saliva substitutes in the treatment of xerostomia and hyposalivation caused by radiation therapy for head and neck malignancies. METHODS A literature search was conducted during July to September 2008 in PubMed, using the query terms "saliva substitute", "saliva substitute and xerostomia", "artificial saliva", and "artificial saliva and xerostomia"; for clinical studies, only studies in patients suffering from radiation-induced xerostomia have been included in the review. RESULTS AND CONCLUSION Fifty-two studies met the inclusion criteria and were allotted either to the in vitro topics "viscosity", "lubrication", "wetting properties", "antimicrobial effects", and "enamel and dentin de- and remineralization", or to the in vivo topics "clinical acceptance" or "influence on plaque formation and oral mucosa and microflora". The findings suggest that there are significant differences in the performance of various saliva substitutes concerning the review parameters, yet indicate that further in vitro and in vivo studies on the properties of saliva substitutes are necessary.
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Affiliation(s)
- Sebastian Hahnel
- Department of Prosthetic Dentistry, Regensburg University Medical Center, 93042 Regensburg, Germany.
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Bürgers R, Eidt A, Frankenberger R, Rosentritt M, Schweikl H, Handel G, Hahnel S. The anti-adherence activity and bactericidal effect of microparticulate silver additives in composite resin materials. Arch Oral Biol 2009; 54:595-601. [DOI: 10.1016/j.archoralbio.2009.03.004] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2008] [Revised: 02/02/2009] [Accepted: 03/14/2009] [Indexed: 10/20/2022]
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Gosau M, Draenert FG, Müller S, Frerich B, Bürgers R, Reichert TE, Driemel O. Two modifications in the treatment of keratocystic odontogenic tumors (KCOT) and the use of Carnoy’s solution (CS)—a retrospective study lasting between 2 and 10 years. Clin Oral Investig 2009; 14:27-34. [DOI: 10.1007/s00784-009-0264-6] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2008] [Accepted: 03/02/2009] [Indexed: 11/28/2022]
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Bürgers R, Cariaga T, Müller R, Rosentritt M, Reischl U, Handel G, Hahnel S. Effects of aging on surface properties and adhesion of Streptococcus mutans on various fissure sealants. Clin Oral Investig 2009; 13:419-26. [DOI: 10.1007/s00784-009-0256-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2008] [Accepted: 01/27/2009] [Indexed: 11/27/2022]
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46
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Hahnel S, Rosentritt M, Handel G, Bürgers R. In vitro evaluation of artificial ageing on surface properties and early Candida albicans adhesion to prosthetic resins. J Mater Sci Mater Med 2009; 20:249-255. [PMID: 18758916 DOI: 10.1007/s10856-008-3570-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2008] [Accepted: 08/18/2008] [Indexed: 05/26/2023]
Abstract
OBJECTIVE The aim of this in vitro study was to examine potential changes and influences of prosthetic resin surface properties on Candida albicans adhesion after surface treatment or artificial ageing. MATERIALS AND METHODS Standardized specimens of a denture base resin and a veneering composite were prepared, polished, and randomly subjected to different surface roughness treatments or artificial ageing protocols (storage in ethanol or artificial saliva for 7/90 d, thermocycling). Surface roughness (Ra) and surface free energy were determined prior and after each treatment. Specimens were incubated with phosphate buffered saline or whole saliva for 2 h at 37 degrees C, and later with Candida albicans suspension (2.5 h, 37 degrees C). Adherent viable fungi were quantified using a bioluminescence assay. RESULTS Artifical ageing did not affect substratum surface roughness, yet slight increases in substratum surface free energy and significant increases in Candida albicans adhesion were observed. Saliva coating marginally influenced Candida albicans adherence to reference and surface treated specimens, yet more pronounced differences in Candida albicans adhesion between the various artificially aged specimens were found. CONCLUSION No correlation between substratum surface roughness or surface free energy and Candida albicans adhesion could be established.
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Affiliation(s)
- Sebastian Hahnel
- Department of Prosthetic Dentistry, Regensburg University Medical Center, Regensburg, 93042, Germany.
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Hahnel S, Rosentritt M, Handel G, Bürgers R. Influence of saliva substitute films on initial Streptococcus mutans adhesion to enamel and dental substrata. J Dent 2008; 36:977-83. [DOI: 10.1016/j.jdent.2008.08.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2008] [Revised: 07/20/2008] [Accepted: 08/07/2008] [Indexed: 11/29/2022] Open
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Hahnel S, Rosentritt M, Bürgers R, Handel G. Surface properties and in vitro Streptococcus mutans adhesion to dental resin polymers. J Mater Sci Mater Med 2008; 19:2619-2627. [PMID: 18197372 DOI: 10.1007/s10856-007-3352-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2007] [Accepted: 12/21/2007] [Indexed: 05/25/2023]
Abstract
OBJECTIVES This study aimed to characterize the surface properties of experimental resin polymers consisting of monomers differing in functionality and chain length, and to evaluate differences in Streptococcus mutans adhesion. MATERIAL AND METHODS Six resins were prepared (70/30 ratio UDMA/monomer); camphorquinone and ethyl-4-dimethylaminebenzoate were added for light activation. A conventional composite was used as a control. Surface free energy was determined prior and after saliva exposition (2 h, 37 degrees C). After saliva incubation (2 h, 37 degrees C), specimens were incubated with Streptococcus mutans NCTC 10449 for 2.5 h at 37 degrees C. Adherent bacteria were quantified by determining the relative substratum area covered by bacteria using SEM analysis, and by using a fluorometric assay for viable cell quantification. RESULTS No statistically significant differences in total surface free energies were found for uncoated specimens (mean total surface free energies ranging from 39.79 to 49.73 mJ/m(-2)); after saliva coating, statistically significant differences were observed for some of the polymers (mean total surface free energies ranging from 44.13 to 65.81 mJ/m(-2)). Few differences were observed between SEM and fluorescence quantification, finding statistically significant differences in streptococcal adhesion to the experimental polymers. Median bacteria surface coverage ranged from 1.4% for UDMA mixed with 1,10-decandiol dimethacrylate to 16.2% for the control composite material; lowest fluorescence intensities indicating lowest adhesion of bacteria were found for UDMA mixed with 1,10-decandiol dimethacrylate (median 712), and highest values indicating highest adhesion of bacteria were found for UDMA mixed with polyethyleneglycol (600) dimethacrylate (median 11974). CONCLUSION Streptococcus mutans adhesion appears to be different on polymers differing in monomer mixtures, yet correlations between substratum surface free energy and streptococcal adhesion were poor. Further studies are necessary to evaluate additional substratum surface properties and pellicle distribution and composition more thoroughly.
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Affiliation(s)
- Sebastian Hahnel
- Department of Prosthetic Dentistry, Regensburg University Medical Center, Germany.
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Rosentritt M, Hahnel S, Gröger G, Mühlfriedel B, Bürgers R, Handel G. Adhesion ofStreptococcus mutans to various dental materials in a laminar flow chamber system. J Biomed Mater Res B Appl Biomater 2008; 86:36-44. [DOI: 10.1002/jbm.b.30985] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Faltermeier A, Bürgers R, Rosentritt M. Bacterial adhesion of Streptococcus mutans to esthetic bracket materials. Am J Orthod Dentofacial Orthop 2008; 133:S99-103. [DOI: 10.1016/j.ajodo.2007.03.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2007] [Revised: 03/01/2007] [Accepted: 03/01/2007] [Indexed: 10/22/2022]
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