Tomasz Gedrange

Technische Universität Dresden, Dresden, Saxony, Germany

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Publications (79)96.69 Total impact

  • W Harzer · E Tausche · T Gedrange
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    ABSTRACT: IntroductionThe DentEd Thematic Networks (TNP) were funded from the EU to converge and harmonise the dental curricula. Forty-four dental schools participated in this visitation process between 1998 and 2002. The aim of the survey was to evaluate the implementation of the Dented outcomes in the curricula and if the concept of core competences are integrated in the curriculum.Material and Method In October 2012, questionnaires were sent out to all dental schools participated in the visitation process of Dented and Dented evolves. The main question blocs were as follows: structure of the curriculum and facilities, education of students, content and quality of education, assessment, research, European involvement and value of visit for the school.ResultsTwenty-five dental schools (57%) answered to the questionnaire. The responder represented 20 European countries of 22, whose schools were involved (91%). The self-assessment report was stimulating the continuation of curriculum improvement. Most of them acknowledge that major competences are essential outcome for the graduated dentist. Twelve schools (58%) rated the value of the DentEd visit with strong positive influence.DiscussionThe visits showed strengths, weaknesses and threats. Three-quarter of all schools implemented the European Credit Transfer System (ECTS). But most of them did not realize the unit of ECTS with modules among the Bologna process.Conclusion The self-assessment report was a core issue for the continuation of curriculum improvement. The challenge for the ongoing curriculum improvement is the implementation of the module system among the Bologna recommendations.
    No preview · Article · Sep 2015 · European Journal Of Dental Education
  • Ute Botzenhart · Julia Seeliger · Tomasz Gedrange

    No preview · Article · Jun 2015 · Zahnmedizin up2date
  • Agnieszka Mielczarek · Tomasz Gedrange · Joanna Michalik
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    ABSTRACT: To compare the effect of combinations of fluoride (F) products on remineralization of caries-like lesions. Demineralized human enamel specimens were assessed by surface microhardness (SMH), stratified and allocated to five treatments groups: (1) Toothpaste containing 1% nano hydroxyapatite (HAP) + 1,450 ppm F; (2) Tooth mousse containing 10% casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) + 900 ppm F plus F toothpaste (1,450 ppm F as NaF); (3) F varnish containing 22,600 ppm F plus F toothpaste (1,450 ppm F as NaF); (4) F toothpaste (1,450 ppm F as NaF); and (5) placebo--distilled water (P). Each group was treated in a 21-day pH-cycling model. Groups 1, 4 and 5 were treated 2x/day. In Group 3, the tooth mousse was administered 1x/day plus 2x/day F toothpaste treatment. In Group 4, F varnish was administered 1x/week plus 2x/day treatment with F toothpaste. After cycling, SMH was re-measured and cross-sectional microhardness measurements were taken. Groups 1-4 produced significant rehardening of enamel. In the superficial layer (25-50 μm deep) significantly higher mineralization (up to 83%, by Volume (V), P < 0.0001) was achieved for Groups 2 and 3. In the area of 75-100 μm deep, the highest mineralization was observed for Groups 1 and 4 (V% = 68-83%).
    No preview · Article · Feb 2015 · American journal of dentistry
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    ABSTRACT: The aim of the present study was to identify properties of pure collagen for augmentation techniques and compare to a proved xenogenic material and natural bone regeneration. For that the osteogenesis of extraction alveoli after augmentation with a collagen cone covered with an absorbable collagen membrane in a single product (PARASORB Sombrero®, Resorba) was evaluated in a pig model. Extraction alveoli were treated with the collagen cone and the collagen membrane in a single product (test group; n = 7) or demineralized bovine bone mineral and a collagen membrane (two separate products; positive control; n = 7). Untreated alveoli were used (n = 6) as negative controls.1 Bone specimens were extracted 1 and 3 months after teeth extraction. Serial longitudinal sections were stained with Masson Goldner trichrome. Furthermore, bone specimens were examined using X-ray analyses. Significant differences of bone atrophy were detected 12 weeks after material insertion using X-ray analyses. The bone atrophy was reduced by approximately 32% after insertion of the positive control (P = 0.046). Bone atrophy reached 37.6% of those from untreated alveoli (P = 0.002) using the test group. After 4 weeks, bone formation was noticeable in most sites, whereas after 12 weeks of healing, specimens of all groups exhibited nearly complete osseous organization of the former defected area. The mandibulary bone texture showed typical spongious bone structures. Histomorphometric analyses revealed after 4 and 12 weeks significant higher levels of bone marrow in test and negative control than in positive control. Quantification of bone tissue and osteoid does not show any significant difference. The present study confirms reduced bone resorption following socket augmentation with an absorbable collagen membrane with collagen cone while the resulting bone structure is similar to natural bone regeneration. Pure collagen can be used for bone augmentation, and shows over other xenogenic materials, a clear advantage with respect to the bone density and structure.
    Full-text · Article · Jan 2015 · Materials Science and Engineering C
  • Marzena Dominiak · Tomasz Gedrange
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    ABSTRACT: Gingival recession (GR) is a common clinical situation observed in patient populations regardless of their age and ethnicity. It has been estimated that over 60% of the human population has gingival recession. It is the final effect of the interaction of multiple etiological factors. Identification and definition of the range of influence is often not possible, with the result that new methods for testing and elimination of potential etiological factors are still being sought. The aim of this study is to present the etiopathogenesis of gingival recessions with regard to the analysis of morphological and functional factors. For the assessment of the bone factors, we will describe the new cephalometric method for measuring sagital width of the bone in the central incisors area, places when GR are most commonly observed. Also, a review will be presented of modern methods of treatment; in particular classes recessions; usage substitute of autogenous tissue will be emphasized - collagen matrix, and primary culture fibroblasts on collagen net.
    No preview · Article · Nov 2014 · Advances in Clinical and Experimental Medicine
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    ABSTRACT: Aims: The objective of the present study was to discuss the practical application of a new method for measuring bone width in the anterior section of the mandible to assess the progression of gingival recessions after orthodontic treatment based on a description of case studies. Methods: Three cases with skeletal classes I, II and III aged 20-29 were presented. We assessed the risk of gingival recessions around lower incisors by analysing cephalograms before and after orthodontic treatment. The following values were analysed: the angle of buccal bone thickness in the anterior section of the mandible (API-CEJ2-B), the height of bone dehiscence (CEJ2-Id) and the width of the mentalis (B-D). Recession height (RD) and width (RW) were clinically measured using calibrated 1mm periodontometer. Results: The mean baseline angle of API-CEJ2-B[°] was 22.23° before and no lower than 16° after treatment. In all patients CEJ2-Id was 0.56 mm before and greater than 1.4 mm following treatment. This was reflected clinically in the absence of new gingival recessions or the progression of an already existing recession in the area of the lower incisors in the first two cases. In the third case, height of recessions was increased to 1.25 mm average value. The mean baseline width for B-D was 13.46 mm; in all cases it increased up to 14.5 mm after treatment, most significantly in the case of a female patient with skeletal class II. Conclusions: An analysis of cephalometric images, including basic cranio- and gnathometric measurements together with a careful assessment of bone, mucosal and dental parameters of the alveolar ridge, can be a useful instrument to determine the risk of gingival recessions and to choose the right orthodontic treatment option, ensuring the highest possible aesthetic-functional treatment outcome.
    No preview · Article · Sep 2014 · Oral health and dental management
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    ABSTRACT: Bone density and quantity are primary conditions for the insertion and stability of dental implants. In cases of a lack of adequate maxillary or mandibulary bone, bone augmentation will be necessary. The use of synthetic bioactive bone substitution materials is of increasing importance as alternatives to autogenously bone grafts. It is well known that bone can influence muscle function and muscle function can influence bone structures. Muscles have a considerable potential of adaptation and muscle tissue surrounding an inserted implant or bone surrogate can integrate changes in mechanical load of the muscle and hereupon induce signaling cascades with protein synthesis and arrangement of the cytoskeleton. The Musculus latissimus dorsi is very often used for the analyses of the in vivo biocompatibility of newly designed biomaterials. Beside macroscopically and histologically examination, biocompatibility can be assessed by analyses of the biomaterial influence of gene expression. This review discusses changes in the fiber type distribution, myosin heavy chain isoform composition, histological appearance and vascularization of the skeletal muscle after implantation of bone substitution materials. Especially, the effects of bone surrogates should be described at the molecular-biological and cellular level.
    No preview · Article · Aug 2014 · Annals of Anatomy - Anatomischer Anzeiger
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    ABSTRACT: Introduction: New biomaterials and their various surface modifications should undergo in vitro and in vivo evaluation before clinical trials. The objective of our in vivo study was to evaluate the biocompatibility of newly created zirconium implant surfaces after implantation in the lower jaw of pigs and compare the osseointegration of these dental implants with commercially available zirconium and titanium implants. Materials and methods: After a healing period of 12 weeks, a histological analysis of the soft and hard tissues and a histomorphometric analysis of the bone-implant contact (BIC) were performed. Results: The implant surfaces showed an intimate connection to the adjacent bone for all tested implants. The 3 newly created zirconium implant surfaces achieved a BIC of 45% on average in comparison with a BIC of 56% from the reference zirconium implants and 35% from titanium implants. Furthermore, the new zirconium implants had a better attachment to gingival and bone tissues in the range of implant necks as compared with the reference implants. Conclusion: The results suggest that the new implants comparably osseointegrate within the healing period, and they have a good in vivo biocompatibility.
    No preview · Article · Jul 2014 · Implant Dentistry
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    ABSTRACT: Tissue engineered cell-seeded constructs with poly(3)hydroxybutyrate (PHB) induced ectopic bone formation after implantation into the back muscle of rats. The objective of our in vivo study was to evaluate the osteogenic potential of pure PHB patches in surgically created cranial defects. For this, PHB patches were analyzed after implantation in surgically created defects on the cranium of adult male rats. After healing periods of 4, 8 and 12 weeks, the bone tissue specimens containing PHB patches were processed and analyzed histologically as well as molecular-biologically. After 4 weeks, the PHB patches were completely embedded in connective tissue. Eight weeks after PHB insertion, bone regeneration proceeding from bearing bone was found in 50% of all treated animals, whereas all PHB treated cavities showed both bone formation and embedding of the patches in bone 12 weeks after surgery. Furthermore, all slices showed pronounced development of blood vessels. Histomorphometric analysis presented a regenerated bone mean value between 46.4 ± 16.1% and 54.2 ± 19.3% after 4 to 12 weeks of healing. Caveolin-1 staining in capillary-like structures showed a 1.16 to 1.38fold increased expression in PHB treated defects compared to controls. Real-time RT-PCR analyzes showed significantly lower expressions of Alpl, Col1a1 and VEGFA in cranium defects after treatment with PHB patches compared to untreated bony defects of the same cranium. Within the limits of the presented animal investigation, it could conclude that the tested PHB patches featured a good biocompatibility and an osteoconductive character.
    No preview · Article · May 2014 · Annals of Anatomy - Anatomischer Anzeiger
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    ABSTRACT: Understanding the changes in bone density after insertion of dental implants and their relation to immediate loading is essential to achieving improvements in their survival rate. Histological investigations of the bone bed in humans are limited, which in turn hampers opportunities to deepen knowledge about the remodelling process around dental implants. The aim of the present study was to follow the change in bone density by measuring the grey values of cone beam computed tomography (CBCT) at different periods subsequent to implant insertion. The CBCTs of twenty individual immediately loaded implants were evaluated at three time points: Prior to surgery, one month following, and six months after the operation. The grey values were measured at different regions around the implants. Reduction in the grey values was observed with respect to the reference values after one month and six months from implant insertion in the apical, middle, and cervical regions. No correlation was detected either between the change in grey values and drilling method or with the measured primary and secondary stabilities by Osstell ISQ instrument. Cone beam computed tomography can be used as a qualitative method to support clinical follow up and monitor the changes in bone density around implants in critical cases.
    No preview · Article · Mar 2014 · Annals of anatomy = Anatomischer Anzeiger: official organ of the Anatomische Gesellschaft
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    ABSTRACT: Reduced vertical bone level in the implantation area is often considered one of the limiting factors before implant insertion. Inserting implants of reduced length might be useful in order to avoid vertical bone augmentation prior to implantation. To the present day, no official guidelines exist as to the optimal length for these implants. It is nevertheless well known that the stability of an implant depends primarily on its osseointegration, which could otherwise be influenced by modifying implant surface texture. The aim of our study was to evaluate osseointegration in correlation with implant length and surface texture. Three different variations of titan implants (n = 5) were compared: two types, each with an acid-etched and ceramic blasted surface, were inserted in the upper jaw of adult female minipigs at different lengths (tioLogic ST Shorty, 5 mm length; tioLogic ST, 9 mm length) and were compared to a control group (tioLogic ST, 9 mm length, ceramic blasted surface). Eight weeks after unloaded healing, bone tissue specimens containing the implants were processed, stained with Masson-Goldner-trichrome and analyzed histologically. Regardless of implant length and surface texture, new bone formation with no signs of inflammation could be detected in the area of the threads. Implants with a modified surface showed no statistically significant difference in bone-implant-contact (BIC) (tioLogic ST Shorty, 56.5%; tioLogic©ST; 77.2%), but a statistically significant difference could be found, when the 9 mm implants were compared to the control group (BIC 48.9%). Surface modification could positively influence osseointegration as well as contribute to overcoming the adverse effects of length reduction.
    Full-text · Article · Mar 2014 · Annals of anatomy = Anatomischer Anzeiger: official organ of the Anatomische Gesellschaft
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    ABSTRACT: In orthodontics, bone structure, its density and dimensions play an essential role by explaining limitations in magnitude, size and extent of tooth movement. Severe anterior crowding is one of the most frequently encountered dental malocclusions. Its therapy is mostly limited by lack of basal and alveolar bone and it often involves tooth extractions. Mandibular midline distraction osteogenesis is a method of natural bone generation and also a treatment option to achieve space regaining in a much-reduced lower jaw with distinctive frontal place deficit and severe anterior crowding, without sacrificing permanent teeth. McCarthy and Guerrero were of the first researchers reporting on this method applied on human lower jaws and they increased clinical interest in this approach. Although this method has been clinically used ever since, many questions concerning effects on bone regeneration speed, bone quality, tooth movement into regenerated area, periodontal health and long-time stability of treatment outcomes have not been sufficiently investigated. This overview should present the current clinical and biological state of knowledge about bone gain and tooth movement through regenerate bone. Furthermore it should encourage interest in further research on this topic.
    Full-text · Article · Dec 2013 · Oral health and dental management
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    ABSTRACT: The aim of this study was to evaluate the in vivo biocompatibility of a biphasic calcium phosphate (BCP) bone graft substitute consisting of 60% hydroxyapatite and 40% ß-tricalcium phosphate (ß-TCP) in comparison to a pure ß-TCP of identical shape and porosity. The materials were evaluated using an established rat cranial defect model in 24 animals. One bone defect with a diameter of 5 mm was created per animal. The defects were filled with either BCP or ß-TCP and left to heal for 4 weeks. Twelve samples (6 per material) were processed for histological evaluation and immunohistochemistry. The remaining 12 samples were processed for mRNA expression analysis. No signs of inflammation or adverse material reactions were detected. New bone formation in the former defect site did not differ between the two groups (BCP: 49.2%; ß-TCP: 52.4%). Osteoblast-like and TRAP-positive osteoclast-like cells were found at the surface of the bone graft substitute granules. The ß-TCP group showed significantly higher mRNA levels for the bone resorption marker Acp5 and osteogenic differentiation marker Runx2. The expression of IGF1, IGF2, VEGF, Phex, Alpl, Col1, Col2, Bglap and MMP8 did not differ between the groups. The in vivo biocompatibility of BCP is to a large part identical to those of TCP. Within the limitation of the animal model, the implantation study shows that BCP can be used as bone graft substitute, due to the fact that the material integrates into tissue, remains stable in the implantation bed and serves as an osteoconductive scaffold.
    Full-text · Article · Dec 2013 · Annals of anatomy = Anatomischer Anzeiger: official organ of the Anatomische Gesellschaft
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    ABSTRACT: Masticatory muscle weakness in patients with Duchenne muscular dystrophy may influence cranial bone development and cause changes in cranio- and dentofacial morphology. To examine whether masticatory muscle weakness and thus disturbed muscle function is accompanied by changes of geometry of the craniofacial complex, we compared craniofacial morphology of dystrophic mdx mice with those of controls during growth and adulthood. For that 30, 100 and 365 days old control and mdx mice were investigated. Standardized radiographs and cone-beam computed tomographies of each mouse head were taken; cephalometric landmarks identified and processed by the computer programs FR-WIN and Osirix. In 30 days old mdx mice, which display muscle weakness, all measured dimensions were smaller compared to controls with exception of incisor length. Only four of eight analysed dimensions were found to be smaller through all age groups investigated when compared to controls. The reduction of measurements in young mdx mice suggests that muscle function may influence the geometry of the craniofacial complex during growth. Muscle regeneration and functional recovery that occur in older mice may compensate for bone growth deficiencies during earlier stages of development.
    Full-text · Article · Aug 2013 · Archives of oral biology
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    ABSTRACT: Objectives: To histologically analyze the early angiogenesis-osteogenesis interplay in post-extraction sockets augmented with magnesium-enriched hydroxyapatite (Mg-enriched HA). Material and methods: Ten post-extraction sites underwent post-extraction ridge preservation procedure. According to randomization, sites were divided into two balanced groups and bone specimens were collected 2 or 4 months after surgery. Sections were stained with hematoxylin/eosin, Masson-Goldner trichrome, and tartrate-resistant acid phosphatase (TRAP), respectively. Furthermore, indirect immunohistochemistry was performed using alkaline phosphatase, CD34 and caveolin-1 antibodies. Mean values and standard deviations were calculated for each outcome variable. Data were then compared using one-way ANOVA test. P < 0.05 was considered statistically significant. Results: Histomorphometric analysis presented 15.0% (±3.5) regenerated bone after 2 months of healing. After 4 months, regenerated bone increased 5.1-fold up to 77.4% (± 8.6) (P < 0.001). On the contrary, vessels and capillary reduced from 645 (±33) to 255 (± 94) (caveolin-1 expression, P = 0.008). These findings were confirmed by CD34 expression (301 ± 95 and 88 (±24), respectively, at 2 and 4 months (P = 0.046). Conclusions: Within the limits of the present randomized controlled study, it can be concluded that Mg-enriched HA is a suitable material for socket preservation and ensures early angiogenesis and early osteogenesis.
    No preview · Article · Apr 2013 · Clinical Oral Implants Research
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    ABSTRACT: Voluminous research has focused on the identification of sources of adult stem cells in human body. Recent progress on the isolation and regulation of stem cells may enable the future development of novel therapeutic strategies based on the concept of regeneration of damaged or diseased organs. Recently various subpopulations of mesenchymal stem cells were identified in dental tissues, including dental pulp, apical papilla and periodontal ligament. They are considered to offer potential for regeneration of tooth structure and bone. Additionally, dental stem cells can possibly be applied in therapy of other disorders such as Alzheimer's disease, Parkinson's disease or cardiac ischemia. This review describes the stem cell subpopulations derived from dental tissues and their potential role in tooth regeneration and other therapies.
    No preview · Article · Jan 2013 · Central-European Journal of Immunology
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    ABSTRACT: The paper presents clinical-radiological research on the impact of the new semi-cement luting agent in the immediately loaded implant-supported restoration on alveolar ridge resorption. 25 patients with a partially edentulous alveolar ridge in the anterior section of the maxilla or mandible were included in the study. The implants were inserted with the application of traditional burs or with a Piezosurgery device supplied by Mectron. Taking into account the method of implant bed preparation, the scientific material was divided into two groups. The implants were loaded immediately with single crown restorations cemented with the Implantlink semi cement application. The following indices were taken into consideration: pocket depth around implant calculated at four measuring points, marginal alveolar bone loss measured using radio-visiography, the 3-degree Wachtel scale of healing of the soft tissue. In addition, the presence and possible width or height of any recession around the implants was measured. The success of the implant treatment was assessed according to the Albrektsson success criteria. The research results were subjected to statistical analysis. The results of our study revealed no influence of the Implant-link semi cement on the crestal bone level, regardless of the bone bed preparation technique.
    No preview · Article · Jan 2013 · Annales Academiae Medicae Stetinensis
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    ABSTRACT: Background In most cases, the natural healing of intrabony defects only leads to restoration of tissue continuity without differentiation and function. However, repair is not regarded to be an optimal treatment method, as confirmed in many clinical cases. Thus it is important to choose a surgical procedure which makes it possible to achieve restitution ad integrum of the bone structure. The choice of the GBR technique is crucial, in terms of the clinical conditions and limitations resulting from the use of a particular material. Objective The objective of this study has been the analysis of effectiveness of selected surgical treatment techniques of intrabony defects in rabbits. Materials and methods Research was conducted on 36 white rabbits. The operation technique was a criterion of division into 3 groups: BG/BOC (Bio-Oss Collagen® + Bio-Gide Perio®), BOC/PRP (Bio-Oss Collagen® + PRP), C (control group). Qualitative and quantitative histopathological evaluation was carried out after 1, 3, 6 and 12 months. Results The highest value of the bone surface area 31.9% (SD 1.8) was achieved in BOC/BG group three months after the implantation, while the lowest was revealed in C – group – 12.5% (SD 1.32) one month following the procedure. Conclusions Upon quantitative histological assessment, the bone tissue presented the most intensive osteogenesis within one month from the application of BOC/PRP, whereas this was observed after the application of BOC/BG in later stages. The application of two regenerative methods influenced the rate, quality and overall treatment of intraosseus defects.
    Full-text · Article · Nov 2012 · Annals of anatomy = Anatomischer Anzeiger: official organ of the Anatomische Gesellschaft
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    ABSTRACT: New biomaterials including surface modifications should undergo in vitro and in vivo evaluation before clinical trials. The objective of our in vivo study was to evaluate the biocompatibility of one of the newly fabricated zirconia implant surfaces, called "mds". For this purpose, the osseointegration of these implants was analyzed after implantation in surgically created defects in the cranium of adult male rats. After a healing period of 28 and 56 days, respectively, bone tissue specimens containing the implants were processed and histologically analyzed. For this purpose, sections were stained with haematoxylin/eosin and Masson Goldner trichrome. No signs of cellular inflammatory infiltrate were found in any of the animals. After 28 days, slices showed pronounced development of blood vessels and bone regeneration. After 56 days of healing, direct bridging of the bone defects was detectable with distinctly visible kit lines. There were cell rich areas of connective tissue/bone marrow between zirconia discs and bearing bone. Histomorphometric analysis presented a regenerated bone mean value of 36.3% after 28 days of healing. After 56 days of healing, a 1.6 fold increased bone mean value was observed (58.2%). Using the same analysis, 1% and 39.9% of bone-implant-contact was visible after both healing periods, respectively. On average, connective tissue/marrow spaces occupied 99% of implant-contact-area after 28 days of healing. This area was reduced to 60.1% after 56 days. Within the limits of the animal investigation presented, it was concluded that the tested surface modification of zirconia implants were biocompatible and osseoconductive.
    No preview · Article · Oct 2012 · Annals of anatomy = Anatomischer Anzeiger: official organ of the Anatomische Gesellschaft

  • No preview · Article · May 2012 · Czasopismo stomatologiczne

Publication Stats

488 Citations
96.69 Total Impact Points


  • 2004-2015
    • Technische Universität Dresden
      • • Center for dental, oral and maxillofacial surgery
      • • Faculty of Medicine Carl Gustav Carus
      Dresden, Saxony, Germany
    • Universitätsklinikum Dresden
      • Poliklinik für Kieferorthopädie
      Dresden, Saxony, Germany
  • 2007-2012
    • Carl Gustav Carus-Institut
      Pforzheim, Baden-Württemberg, Germany
  • 2005-2012
    • University of Greifswald
      • • Department of Orthodontics
      • • Department of Preventive and Pediatric Dentistry
      Griefswald, Mecklenburg-Vorpommern, Germany