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Hanafi A, Donnermeyer D, Schäfer E, Bürklein S. Perception of a modular 3D print model in undergraduate endodontic education. Int Endod J 2020; 53:1007-1016. [PMID: 32220071 DOI: 10.1111/iej.13299] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [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: 01/15/2020] [Accepted: 03/20/2020] [Indexed: 11/30/2022]
Abstract
AIM To evaluate a modular 3D print training dental model with embedded human teeth and electronic working length determination for undergraduate endodontic education. METHODOLOGY Cone-beam volume tomography data of a human skull were transferred into stereolithographic (STL) data, and a customizable modular 3D print model with individually removable sextants and teeth was generated for the use in commercially available phantom heads. Each of sixty-eight students performed a complete root canal treatment on an extracted human tooth. Working lengths were determined with electronic apex locators (EAL) and verified radiographically. Subsequently, an evaluation was carried out with regard to the difficulty of the working steps access cavity preparation, working length determination, root canal preparation/irrigation and canal filling, and these steps were compared to commonly used benchtop models. Additionally, the agreement of electronic and radiographic working length determination was assessed and analysed statistically with the chi-square test. RESULTS A total of 68 teeth (20 incisors, 26 premolars and 22 molars) with 127 root canals were treated. In total, 87% of the students considered the modular 3D print model considerably more demanding than the conventional benchtop model. Overall, 96% felt better prepared for the clinical situation, 92% felt markedly reduced stress levels during endodontic practice in the subsequent clinical courses, and 93% of the students suggested the model should be used in future preclinical endodontic training. The preradiographic use of EAL resulted in 85% of the cases having radiographically acceptable working length determination within 0-2 mm from the radiographic apex. Readings more than 2 mm from the apex or beyond were significantly more common in molars than in premolars and incisors (P < 0.05). CONCLUSIONS The vast majority of students rated the modular 3D print training model positively despite it being more demanding. They also recommended its use in preclinical teaching and training. The model allowed a more realistic simulation of the clinical situation with a simultaneous use of EALs and led to reduced stress levels in endodontic treatment in the subsequent clinical courses.
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Affiliation(s)
- A Hanafi
- Private Office, Gelsenkirchen, Germany
| | - D Donnermeyer
- Department of Periodontology and Operative Dentistry, University of Münster, Münster, Germany
| | - E Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry, University of Münster, Münster, Germany
| | - S Bürklein
- Central Interdisciplinary Ambulance in the School of Dentistry, University of Münster, Münster, Germany
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Donnermeyer D, Urban K, Bürklein S, Schäfer E. Physico-chemical investigation of endodontic sealers exposed to simulated intracanal heat application: epoxy resins and zinc oxide-eugenols. Int Endod J 2020; 53:690-697. [PMID: 31955439 DOI: 10.1111/iej.13267] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 07/24/2019] [Accepted: 01/15/2020] [Indexed: 11/27/2022]
Abstract
AIM To gain information in a laboratory setting about the effect of thermal treatment of epoxy resin-based and zinc oxide-eugenol-based sealers. METHODOLOGY AH Plus and Pulp Canal Sealer (PCS) were exposed to thermal treatment at 37, 47, 57, 67, 77, 87 and 97 °C for 30 s. According to clinically relevant considerations, intracanal sealer temperature is likely not to exceed 60 °C during warm vertical root canal filling. Heat application is recommended for less than 30 s during continuous wave technique, but might exceed this threshold in complex cases. Furthermore, heat treatment at 97 °C was performed for 60 and 180 s to simulate inappropriate implementation of warm vertical filling techniques. Specimens were heated inside 2-mL plastic tubes in a thermo-controlled water bath until the temperatures were reached and kept at this temperature for the determined period of time. Afterwards, specimens were cooled to body temperature and physical properties (setting time, flow, film thickness according to ISO 6876) were assessed. Chemical properties (Fourier transformed infrared spectroscopy) were assessed after complete setting of the specimens in an incubator at 37 °C and 100% humidity. Statistical analysis of physical properties was performed using Kruskal-Wallis test (P = 0.05). RESULTS The setting time of AH Plus and PCS decreased when temperature and duration of heat application increased. Whilst the setting time of AH Plus decreased from 622 min at 20 °C (for 30 s) to 381 min at 97 °C (for 180 s; P < 0.05), heat treatment of PCS at 97 °C for 180 s led to an immediate setting of the material. From 20 °C (for 30 s) to 97 °C (for 30 s), the setting time of PCS decreased from 80.1 to 41.0 h (P < 0.05). Film thickness and flow were not relevantly influenced by thermal treatment except for PCS at 97 °C for 180 s. FT-IR spectroscopy did not reveal any chemical changes of either sealer after thermal treatment. CONCLUSIONS Thermal treatment simulating clinically relevant temperature levels and heating times did not lead to any substantial physical or chemical changes at all temperature levels when heating did not exceed 60 s. AH Plus and Pulp Canal Sealer can be considered suitable for warm root filling techniques.
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Affiliation(s)
- D Donnermeyer
- Department of Periodontology and Operative Dentistry, Westphalian Wilhelms-University, Münster, Germany
| | - K Urban
- Private Office, Kieferchirurgie Gera, Gera, Germany
| | - S Bürklein
- Central Interdisciplinary Ambulance in the School of Dentistry, Münster, Germany
| | - E Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry, Münster, Germany
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Hülsmann M, Donnermeyer D, Schäfer E. A critical appraisal of studies on cyclic fatigue resistance of engine-driven endodontic instruments. Int Endod J 2019; 52:1427-1445. [PMID: 31267579 DOI: 10.1111/iej.13182] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [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: 01/14/2019] [Accepted: 06/30/2019] [Indexed: 11/29/2022]
Abstract
The endodontic literature contains a plethora of studies on static and dynamic cyclic fatigue resistance tests performed on a large array of rotary or reciprocating nickel-titanium endodontic instruments. It was the aim of this review to summarize the currently available evidence to point out the different outcomes from static versus dynamic tests and to assess whether cyclic fatigue tests provide useful data and information for clinical practice. An electronic literature research in the database PubMed was performed using appropriate search terms, and the titles and abstract were screened for relevance. Language was restricted to English. The review reveals marked differences between the results obtained in static and dynamic tests, and also, the results for the same instruments assessed either under static or dynamic experimental conditions are widely inconsistent. Between the lowest and the highest value for one and the same pathfinding instrument was a factor of about 123 when cyclic fatigue was assessed either under static or dynamic experimental conditions. Moreover, standard deviations of up to 30% have been reported. Environmental temperature has a 500% impact on the lifetime of instruments. In conclusion, fatigue resistance tests conducted under room temperature should be regarded as having little meaning and the scientific and clinical benefits of fatigue resistance tests are very limited. These data should be provided by the manufacturer of the instruments.
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Affiliation(s)
- M Hülsmann
- Department of Preventive Dentistry, Periodontology and Cariology, University Medicine Göttingen (UMG), Göttingen, Germany
| | - D Donnermeyer
- Department of Periodontology and Operative, Westphalian Wilhelms-University, Münster, Germany
| | - E Schäfer
- Central Interdisciplinary Ambulance, Westphalian Wilhelms-University, Münster, Germany
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Bürklein S, Stüber JP, Schäfer E. Real-time dynamic torque values and axial forces during preparation of straight root canals using three different endodontic motors and hand preparation. Int Endod J 2018; 52:94-104. [DOI: 10.1111/iej.12980] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 06/29/2018] [Indexed: 11/27/2022]
Affiliation(s)
- S. Bürklein
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
| | - J. P. Stüber
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
| | - E. Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
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Zupanc J, Vahdat-Pajouh N, Schäfer E. New thermomechanically treated NiTi alloys - a review. Int Endod J 2018; 51:1088-1103. [DOI: 10.1111/iej.12924] [Citation(s) in RCA: 166] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 03/16/2018] [Indexed: 11/29/2022]
Affiliation(s)
- J. Zupanc
- Department of Periodontology and Operative Dentistry; Westphalian Wilhelms-University; Münster Germany
| | - N. Vahdat-Pajouh
- Department of Periodontology and Operative Dentistry; Westphalian Wilhelms-University; Münster Germany
| | - E. Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry; Münster Germany
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Hehlmann R, Lauseker M, Saußele S, Pfirrmann M, Krause S, Kolb HJ, Neubauer A, Hossfeld DK, Nerl C, Gratwohl A, Baerlocher GM, Heim D, Brümmendorf TH, Fabarius A, Haferlach C, Schlegelberger B, Müller MC, Jeromin S, Proetel U, Kohlbrenner K, Voskanyan A, Rinaldetti S, Seifarth W, Spieß B, Balleisen L, Goebeler MC, Hänel M, Ho A, Dengler J, Falge C, Kanz L, Kremers S, Burchert A, Kneba M, Stegelmann F, Köhne CA, Lindemann HW, Waller CF, Pfreundschuh M, Spiekermann K, Berdel WE, Müller L, Edinger M, Mayer J, Beelen DW, Bentz M, Link H, Hertenstein B, Fuchs R, Wernli M, Schlegel F, Schlag R, de Wit M, Trümper L, Hebart H, Hahn M, Thomalla J, Scheid C, Schafhausen P, Verbeek W, Eckart MJ, Gassmann W, Pezzutto A, Schenk M, Brossart P, Geer T, Bildat S, Schäfer E, Hochhaus A, Hasford J. Assessment of imatinib as first-line treatment of chronic myeloid leukemia: 10-year survival results of the randomized CML study IV and impact of non-CML determinants. Leukemia 2017; 31:2398-2406. [PMID: 28804124 PMCID: PMC5668495 DOI: 10.1038/leu.2017.253] [Citation(s) in RCA: 185] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 07/04/2017] [Indexed: 01/06/2023]
Abstract
Chronic myeloid leukemia (CML)-study IV was designed to explore whether treatment with imatinib (IM) at 400 mg/day (n=400) could be optimized by doubling the dose (n=420), adding interferon (IFN) (n=430) or cytarabine (n=158) or using IM after IFN-failure (n=128). From July 2002 to March 2012, 1551 newly diagnosed patients in chronic phase were randomized into a 5-arm study. The study was powered to detect a survival difference of 5% at 5 years. After a median observation time of 9.5 years, 10-year overall survival was 82%, 10-year progression-free survival was 80% and 10-year relative survival was 92%. Survival between IM400 mg and any experimental arm was not different. In a multivariate analysis, risk group, major-route chromosomal aberrations, comorbidities, smoking and treatment center (academic vs other) influenced survival significantly, but not any form of treatment optimization. Patients reaching the molecular response milestones at 3, 6 and 12 months had a significant survival advantage. For responders, monotherapy with IM400 mg provides a close to normal life expectancy independent of the time to response. Survival is more determined by patients' and disease factors than by initial treatment selection. Although improvements are also needed for refractory disease, more life-time can currently be gained by carefully addressing non-CML determinants of survival.
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Affiliation(s)
- R Hehlmann
- III. Medizinische Klinik, Medizinische Fakultät Mannheim, Universität Heidelberg, Mannheim, Germany
| | - M Lauseker
- IBE, Universität München, Munich, Germany
| | - S Saußele
- III. Medizinische Klinik, Medizinische Fakultät Mannheim, Universität Heidelberg, Mannheim, Germany
| | | | - S Krause
- Medizinische Klinik 5, Universitätsklinikum, Erlangen, Germany
| | - H J Kolb
- Medizinische Klinik III, Universität München, Munich, Germany
| | - A Neubauer
- Klinik für innere Medizin, Universitätsklinikum, Marburg, Germany
| | - D K Hossfeld
- 2. Medizinische Klinik, Universitätsklinikum Eppendorf, Hamburg, Germany
| | - C Nerl
- Klinikum Schwabing, Munich, Germany
| | | | | | - D Heim
- Universitätsspital, Basel, Switzerland
| | | | - A Fabarius
- III. Medizinische Klinik, Medizinische Fakultät Mannheim, Universität Heidelberg, Mannheim, Germany
| | | | | | - M C Müller
- III. Medizinische Klinik, Medizinische Fakultät Mannheim, Universität Heidelberg, Mannheim, Germany
| | | | - U Proetel
- III. Medizinische Klinik, Medizinische Fakultät Mannheim, Universität Heidelberg, Mannheim, Germany
| | - K Kohlbrenner
- III. Medizinische Klinik, Medizinische Fakultät Mannheim, Universität Heidelberg, Mannheim, Germany
| | - A Voskanyan
- III. Medizinische Klinik, Medizinische Fakultät Mannheim, Universität Heidelberg, Mannheim, Germany
| | - S Rinaldetti
- III. Medizinische Klinik, Medizinische Fakultät Mannheim, Universität Heidelberg, Mannheim, Germany
| | - W Seifarth
- III. Medizinische Klinik, Medizinische Fakultät Mannheim, Universität Heidelberg, Mannheim, Germany
| | - B Spieß
- III. Medizinische Klinik, Medizinische Fakultät Mannheim, Universität Heidelberg, Mannheim, Germany
| | | | - M C Goebeler
- Medizinische Klinik und Poliklinik, Universitätsklinikum, Würzburg, Germany
| | - M Hänel
- Klinik für innere Medizin 3, Chemnitz, Germany
| | - A Ho
- Medizinische Klinik V, Universität Heidelberg, Heidelberg, Germany
| | - J Dengler
- Onkologische Schwerpunktpraxis, Heilbronn, Germany
| | - C Falge
- Medizinische Klinik 5, Klinikum Nürnberg-Nord, Nürnberg, Germany
| | - L Kanz
- Medizinische Abteilung 2, Universitätsklinikum, Tübingen, Germany
| | - S Kremers
- Caritas Krankenhaus, Lebach, Germany
| | - A Burchert
- Klinik für innere Medizin, Universitätsklinikum, Marburg, Germany
| | - M Kneba
- 2. Medizinische Klinik und Poliklinik, Universitätsklinikum Schleswig-Holstein, Kiel, Germany
| | - F Stegelmann
- Klinik für Innere Medizin 3, Universitätsklinikum, Ulm, Germany
| | - C A Köhne
- Klinik für Onkologie und Hämatologie, Oldenburg, Germany
| | | | - C F Waller
- Innere Medizin 1, Universitätsklinikum, Freiburg, Germany
| | - M Pfreundschuh
- Klinik für Innere Medizin 1, Universität des Saarlandes, Homburg, Germany
| | - K Spiekermann
- Medizinische Klinik III, Universität München, Munich, Germany
| | - W E Berdel
- Medizinische Klinik A, Universitätsklinikum, Münster, Germany
| | - L Müller
- Onkologie Leer UnterEms, Leer, Germany
| | - M Edinger
- Klinik und Poliklinik für Innere Medizin 3, Universitätsklinikum, Regensburg, Germany
| | - J Mayer
- Masaryk University Hospital, Brno, Czech Republic
| | - D W Beelen
- Klinik für Knochenmarktransplantation, Essen, Germany
| | - M Bentz
- Medizinische Klinik 3, Städtisches Klinikum, Karlsruhe, Germany
| | - H Link
- Klinik für Innere Medizin 3, Westpfalz-Klinikum, Kaiserslautern, Germany
| | - B Hertenstein
- 1. Medizinische Klinik, Klinikum Bremen Mitte, Bremen, Germany
| | | | - M Wernli
- Kantonsspital, Aarau, Switzerland
| | - F Schlegel
- St Antonius-Hospital, Eschweiler, Germany
| | - R Schlag
- Hämatologische-Onkologische Schwerpunktpraxis, Würzburg, Germany
| | - M de Wit
- Vivantes Klinikum Neukölln, Berlin, Germany
| | - L Trümper
- Klinik für Hämatologie und medizinische Onkologie, Universitätsmedizin, Göttingen, Germany
| | - H Hebart
- Stauferklinikum Schwäbisch Gmünd, Mutlangen, Germany
| | - M Hahn
- Onkologie Zentrum, Ansbach, Germany
| | - J Thomalla
- Praxisklinik für Hämatologie und Onkologie, Koblenz, Germany
| | - C Scheid
- Klinik 1 für Innere Medizin, Universitätsklinikum, Köln, Germany
| | - P Schafhausen
- 2. Medizinische Klinik, Universitätsklinikum Eppendorf, Hamburg, Germany
| | - W Verbeek
- Ambulante Hämatologie und Onkologie, Bonn, Germany
| | - M J Eckart
- Internistische Schwerpunktpraxis, Erlangen, Germany
| | | | | | - M Schenk
- Barmherzige Brüder, Regensburg, Germany
| | - P Brossart
- Medizinische Klinik 3, Universität, Bonn, Germany
| | - T Geer
- Diakonie, Schwäbisch Hall, Germany
| | - S Bildat
- Medizinische Klinik 2, Herford, Germany
| | - E Schäfer
- Onkologische Schwerpunktpraxis, Bielefeld, Germany
| | - A Hochhaus
- Klinik für Innere Medizin 2, Universitätsklinikum, Jena, Germany
| | - J Hasford
- IBE, Universität München, Munich, Germany
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Schmidt A, Schäfer E, Rother C, Droste-Borel I, Macek B, Schwarz S. 96 The impact of oxygen limitation on the secretome of Pseudomonas aeruginosa. J Cyst Fibros 2017. [DOI: 10.1016/s1569-1993(17)30460-5] [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: 11/16/2022]
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Bürklein S, Jäger PG, Schäfer E. Apical transportation and canal straightening with different continuously tapered rotary file systems in severely curved root canals: F6 SkyTaper and OneShape versus Mtwo. Int Endod J 2016; 50:983-990. [DOI: 10.1111/iej.12716] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 10/28/2016] [Indexed: 11/25/2022]
Affiliation(s)
- S. Bürklein
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
| | - P. G. Jäger
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
| | - E. Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
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Saber SEDM, Schäfer E. Incidence of dentinal defects after preparation of severely curved root canals using the Reciproc single-file system with and without prior creation of a glide path. Int Endod J 2015; 49:1057-1064. [DOI: 10.1111/iej.12555] [Citation(s) in RCA: 14] [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] [Received: 06/10/2015] [Accepted: 09/23/2015] [Indexed: 11/30/2022]
Affiliation(s)
- S. E. D. M. Saber
- Department of Endodontics; Faculty of Dentistry; Ain Shams University; Cairo Egypt
| | - E. Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
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Bürklein S, Mathey D, Schäfer E. Shaping ability of ProTaper NEXT and BT-RaCe nickel-titanium instruments in severely curved root canals. Int Endod J 2014; 48:774-81. [DOI: 10.1111/iej.12375] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Accepted: 08/20/2014] [Indexed: 11/29/2022]
Affiliation(s)
- S. Bürklein
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
| | - D. Mathey
- Department of Operative Dentistry; University of Münster; Münster Germany
| | - E. Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
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Marquardt V, Schäfer E, Ewert T. SWOT-Analyse als Instrument für die Weiterentwicklung von Kurorten und Heilbädern. Gesundheitswesen 2014. [DOI: 10.1055/s-0034-1386956] [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: 10/24/2022]
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Schäfer E, Drexler H, Kiesel J. Status Quo der Betrieblichen Gesundheitsförderung in Unternehmen der Gesundheitswirtschaft und des Gesundheitswesens: Ergebnisse einer regionalen Telefonbefragung. Gesundheitswesen 2014. [DOI: 10.1055/s-0034-1387022] [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: 10/24/2022]
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Enders S, Schäfer E, Grunert T. Vorhersage der Grenzflächenspannung von binären und ternären Mischungen. CHEM-ING-TECH 2014. [DOI: 10.1002/cite.201450189] [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: 11/11/2022]
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Saber SEDM, Nagy MM, Schäfer E. Comparative evaluation of the shaping ability of ProTaper Next, iRaCe and Hyflex CM rotary NiTi files in severely curved root canals. Int Endod J 2014; 48:131-6. [DOI: 10.1111/iej.12291] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2014] [Accepted: 04/01/2014] [Indexed: 11/28/2022]
Affiliation(s)
- S. E. D. M. Saber
- Department of Endodontics; Faculty of Dentistry; Ain Shams University; Cairo Egypt
| | - M. M. Nagy
- Department of Endodontics; Faculty of Dentistry; Ain Shams University; Cairo Egypt
| | - E. Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
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Saber SEDM, Nagy MM, Schäfer E. Comparative evaluation of the shaping ability of WaveOne, Reciproc and OneShape single-file systems in severely curved root canals of extracted teeth. Int Endod J 2014; 48:109-14. [DOI: 10.1111/iej.12289] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Accepted: 03/25/2014] [Indexed: 11/29/2022]
Affiliation(s)
- S. E. D. M. Saber
- Department of Endodontics; Faculty of Dentistry; Ain Shams University; Cairo Egypt
| | - M. M. Nagy
- Department of Endodontics; Faculty of Dentistry; Ain Shams University; Cairo Egypt
| | - E. Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
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Grimm R, Eckerskorn C, Lottspeich F, Schäfer E. Rapid Phosphorylation of H3 Histone in Isolated Nuclei of Barley (Hordeum vulgareL.). ACTA ACUST UNITED AC 2014. [DOI: 10.1111/j.1438-8677.1991.tb00196.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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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Bürklein S, Börjes L, Schäfer E. Comparison of preparation of curved root canals with Hyflex CM and Revo-S rotary nickel-titanium instruments. Int Endod J 2013; 47:470-6. [DOI: 10.1111/iej.12171] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Accepted: 07/12/2013] [Indexed: 11/26/2022]
Affiliation(s)
- S. Bürklein
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
| | - L. Börjes
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
| | - E. Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
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Enders S, Schäfer E, Vogelpohl C, Schrader P, Brandenbusch C, Sadowski G. Thermodynamische Fragestellungen bei der Hydroformylierung langkettiger Olefine. CHEM-ING-TECH 2013. [DOI: 10.1002/cite.201250713] [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: 11/06/2022]
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Bürklein S, Benten S, Schäfer E. Quantitative evaluation of apically extruded debris with different single-file systems: Reciproc, F360 and OneShape versus Mtwo. Int Endod J 2013; 47:405-9. [DOI: 10.1111/iej.12161] [Citation(s) in RCA: 135] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 07/02/2013] [Indexed: 11/29/2022]
Affiliation(s)
- S. Bürklein
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
| | - S. Benten
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
| | - E. Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster Germany
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Bürklein S, Benten S, Schäfer E. Shaping ability of different single-file systems in severely curved root canals of extracted teeth. Int Endod J 2012; 46:590-7. [DOI: 10.1111/iej.12037] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2012] [Accepted: 11/03/2012] [Indexed: 12/01/2022]
Affiliation(s)
- S. Bürklein
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster; Germany
| | - S. Benten
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster; Germany
| | - E. Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry; University of Münster; Münster; Germany
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Bürklein S, Hinschitza K, Dammaschke T, Schäfer E. Shaping ability and cleaning effectiveness of two single-file systems in severely curved root canals of extracted teeth: Reciproc and WaveOne versus Mtwo and ProTaper. Int Endod J 2011; 45:449-61. [DOI: 10.1111/j.1365-2591.2011.01996.x] [Citation(s) in RCA: 289] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Arapoglou V, Katsenis K, Syrigos K, Dimakakos E, Zakopoulou N, Tsoutsos D, Gjødsbøl K, Glynn C, Schäfer E, Petersen B. Analgesic efficacy of an ibuprofenreleasing foam dressing compared with local best practice for painful exuding wounds. J Wound Care 2011; 20:319-20, 322-5. [DOI: 10.12968/jowc.2011.20.7.319] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- V. Arapoglou
- University of Athens Aretaieion Hospital, Greece
| | - K. Katsenis
- University of Athens Aretaieion Hospital, Greece
| | - K.N. Syrigos
- Oncology Unit of 3rd Department of Medicine, School of Medicine, University of Athens, Sotiria General Hospital, Athens, Greece
| | - E.P. Dimakakos
- Oncology Unit of 3rd Department of Medicine, School of Medicine, University of Athens, Sotiria General Hospital, Athens, Greece
| | - N. Zakopoulou
- Department and Leg Ulcer Unit, ‘A. Syggros’ Hospital, Athens, Greece
| | - D. Tsoutsos
- Department of Plastic Surgery, Microsurgery and Burn Center, General Hospital of Athens ‘G. Gennimatas’, Greece
| | | | - C. Glynn
- BMI Oxford Clinic, Headington, Oxford, UK
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Herberger K, Rustenbach S, Grams L, Münter K, Schäfer E, Augustin M. Quality-of-care for leg ulcers in the metropolitan area of Hamburg - a community-based study. J Eur Acad Dermatol Venereol 2011; 26:495-502. [DOI: 10.1111/j.1468-3083.2011.04110.x] [Citation(s) in RCA: 29] [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: 11/30/2022]
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Rabe E, Stücker M, Esperester A, Schäfer E, Ottillinger B. Efficacy and Tolerability of a Red-vine-leaf Extract in Patients Suffering from Chronic Venous Insufficiency – Results of a Double-blind Placebo-controlled Study. Eur J Vasc Endovasc Surg 2011; 41:540-7. [DOI: 10.1016/j.ejvs.2010.12.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2010] [Accepted: 12/04/2010] [Indexed: 10/18/2022]
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Bürklein S, Hiller C, Huda M, Schäfer E. Shaping ability and cleaning effectiveness of Mtwo versus coated and uncoated EasyShape instruments in severely curved root canals of extracted teeth. Int Endod J 2011; 44:447-57. [DOI: 10.1111/j.1365-2591.2011.01850.x] [Citation(s) in RCA: 23] [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] [Indexed: 11/30/2022]
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Condorelli GG, Bonaccorso A, Smecca E, Schäfer E, Cantatore G, Tripi TR. Improvement of the fatigue resistance of NiTi endodontic files by surface and bulk modifications. Int Endod J 2010; 43:866-73. [DOI: 10.1111/j.1365-2591.2010.01759.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Abstract
Positive phototropic curvature of Phycomyces sporangiophores (stage I) induced by a short pulse (10 sec) of blue light has been characterized. The curvature response, measured 40 min after irradiation, increases with increasing fluences up to approximately 10(-4) J.m(-2); it then decreases and becomes nearly 0 at a fluence of approximately 10(-1) J.m(-2). The threshold fluence is found near 10(-7) J.m(-2), indicating over 1000-fold higher sensitivity than the first positive phototropism of grass coleoptiles. Positive curvature of the sporangiophore becomes detectable 5 min after irradiation and increases with time up to approximately 40 min. During the course of this curvature development, overall elongation growth of the sporangiophore is first stimulated and then inhibited. The relationship between the phototropic response and the response in overall elongation growth is discussed, and it is suggested that the primary mechanisms of these responses are distinct.
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Affiliation(s)
- M Iino
- Carnegie Institution of Washington, Department of Plant Biology, 290 Panama Street, Stanford, CA 94305
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Bayer O, Schäfer E. Beitrag zur Frage der sogenannten „Dissoziierten Hyperthyreosen”. Dtsch Med Wochenschr 2009. [DOI: 10.1055/s-0028-1118344] [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: 10/20/2022]
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Seelert H, Dani DN, Dante S, Hauss T, Krause F, Schäfer E, Frenzel M, Poetsch A, Rexroth S, Schwassmann HJ, Suhai T, Vonck J, Dencher NA. From protons to OXPHOS supercomplexes and Alzheimer's disease: structure-dynamics-function relationships of energy-transducing membranes. Biochim Biophys Acta 2009; 1787:657-71. [PMID: 19281792 DOI: 10.1016/j.bbabio.2009.02.028] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Revised: 02/20/2009] [Accepted: 02/20/2009] [Indexed: 11/29/2022]
Abstract
By the elucidation of high-resolution structures the view of the bioenergetic processes has become more precise. But in the face of these fundamental advances, many problems are still unresolved. We have examined a variety of aspects of energy-transducing membranes from large protein complexes down to the level of protons and functional relevant picosecond protein dynamics. Based on the central role of the ATP synthase for supplying the biological fuel ATP, one main emphasis was put on this protein complex from both chloroplast and mitochondria. In particular the stoichiometry of protons required for the synthesis of one ATP molecule and the supramolecular organisation of ATP synthases were examined. Since formation of supercomplexes also concerns other complexes of the respiratory chain, our work was directed to unravel this kind of organisation, e.g. of the OXPHOS supercomplex I(1)III(2)IV(1), in terms of structure and function. Not only the large protein complexes or supercomplexes work as key players for biological energy conversion, but also small components as quinones which facilitate the transfer of electrons and protons. Therefore, their location in the membrane profile was determined by neutron diffraction. Physico-chemical features of the path of protons from the generators of the electrochemical gradient to the ATP synthase, as well as of their interaction with the membrane surface, could be elucidated by time-resolved absorption spectroscopy in combination with optical pH indicators. Diseases such as Alzheimer's dementia (AD) are triggered by perturbation of membranes and bioenergetics as demonstrated by our neutron scattering studies.
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Affiliation(s)
- H Seelert
- Department of Chemistry, Technische Universität Darmstadt, Petersenstrasse 22, D-64287 Darmstadt, Germany.
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Palao i Domenech R, Romanelli M, Tsiftsis DD, Slonková V, Jortikka A, Johannesen N, Ram A, Persson LM, Altindas M, Orsted H, Schäfer E. Effect of an ibuprofen-releasing foam dressing on wound pain: a real-life RCT. J Wound Care 2008; 17:342, 344-8. [PMID: 18754195 DOI: 10.12968/jowc.2008.17.8.30797] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE To compare an ibuprofen-releasing foam dressing (Biatain Ibu, ColoplastA/S) with local best practice in the treatment of painful exuding wounds. METHOD In this large-scale randomised comparative study, 853 patients were randomised to either ibuprofen-releasing foam (test) dressing (n=467) or local best practice (n=386). Primary endpoint was wound pain relief from day 1-7, assessed by the patients twice daily using a five-point verbal rating scale. Secondary endpoints were reduction in pain intensity from day 0-7 (assessed using an 11-point numeric box scale), quality of life (assessed using the WHO-5 well-being index and effect on health-related activities of daily living) and the incidence of adverse events. RESULTS After seven days significantly more patients in the experimental group experienced relief from temporary and persistent pain and a reduction in pain intensity,when compared with patients in the local best practice group (p<0.0001). They also experienced a greater improvement in quality of life. The number of adverse events in both groups was low. CONCLUSION The test dressing provided an appropriate wound healing environment, relieved temporary and persistent wound pain, and decreased pain intensity. It was also associated with an improvement in quality of life.
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Affiliation(s)
- R Palao i Domenech
- Department of Plastic Surgery, Hospital Vail d'Hebron, Barcelona, Spain.
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Schäfer E, Stober T. Frühe akustisch evozierte Potentiale und klinische Verlaufsparameter bei Friedreichscher Ataxie. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060986] [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: 10/21/2022]
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Tolksdorf W, Schäfer E, Pfeiffer J, Mittelstaedt GV. Adrenalin-, Noradrenalin-, Blutdruck- und Herzfrequenzverhalten während der Intubation in Abhängigkeit von unterschiedlichen Fentanyl-Dosen. Anasthesiol Intensivmed Notfallmed Schmerzther 2008. [DOI: 10.1055/s-2007-1002530] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Schuch G, Schäfer E, Eggert K, Loges S, Görn M, Laack E, Bokemeyer C, Fiedler W. The tyrosine kinase src plays a crucial role in leukemic cell proliferation in AML. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.10531] [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] [Indexed: 11/20/2022] Open
Abstract
10531 Background: Src-family tyrosine kinases are known to be involved in signal transduction pathways of growth factors and cytokines in hematopoetic cells. While the role of other src family members has been studied widely, only few data exist about c-src in leukemia. The actual study was performed to analyze src mutations in leukemic cells and to determine the role of pp60src in leukemic cell proliferation. Methods: AML cell lines and primary samples were analyzed for expression and activation of src by RT-PCR and Western blot analyses. Mutational analyses were performed by sequencing of C-terminal cDNA from 60 AML samples. The effects of src inhibition were studied by src-specific inhibitors PP1 and PP2 or by siRNA transfection. Effetcs of src inhibition were monitored in proliferation assays and analyzes of signalling through Erk1/2 and apoptosis by annexin V staining and DNA laddering. Results: In all 60 patients analyzed expression of c-src mRNA was detected by RT-PCR. Western blot analyses confirmed strong expression of src on the protein level and revealed a robust activation of the protein as determined by tyrosine phosphorylation. Incubation of leukemic cells with PP1 and PP2 caused significant inhibition of proliferation in a dose dependent manner. Similar results were observed after transfection with specific siRNAs. Src inhibition blocked phosphorylation of pp60src, Erk1/2 and induced apoptosis in leukemic cells. Mutational analyses as performed by SSCP/heteroduplex and bi-directionally sequencing revealed wildtype sequence in cell lines and 60 clinical samples. Conclusions: In summary, pp60src is highly expressed and activated in cell lines and clinical samples of human AML. Moreover, phosphorylation of src is essential for leukemic cell proliferation. Underlying mutations in the coding sequence of c-src causing constitutive activation could be excluded. These data suggest that pp60src plays a crucial role in AML and src inhibition by targeted therapy might offer a useful new approach in the treatment of AML. No significant financial relationships to disclose.
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Affiliation(s)
- G. Schuch
- University Hospital Medical Center Hamburg-Eppendo, Hamburg, Germany
| | - E. Schäfer
- University Hospital Medical Center Hamburg-Eppendo, Hamburg, Germany
| | - K. Eggert
- University Hospital Medical Center Hamburg-Eppendo, Hamburg, Germany
| | - S. Loges
- University Hospital Medical Center Hamburg-Eppendo, Hamburg, Germany
| | - M. Görn
- University Hospital Medical Center Hamburg-Eppendo, Hamburg, Germany
| | - E. Laack
- University Hospital Medical Center Hamburg-Eppendo, Hamburg, Germany
| | - C. Bokemeyer
- University Hospital Medical Center Hamburg-Eppendo, Hamburg, Germany
| | - W. Fiedler
- University Hospital Medical Center Hamburg-Eppendo, Hamburg, Germany
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Sineshchekov V, Hennig L, Lamparter T, Hughes J, Gärtner W, Schäfer E. Recombinant Phytochrome A in Yeast Differs by its Spectroscopic and Photochemical Properties from the Major phyA′ and is Close to the Minor phyA″: Evidence for Posttranslational Modification of the Pigment in Plants¶. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2001)0730692rpaiyd2.0.co2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Stiletto R, Röthke M, Schäfer E, Lefering R, Waydhas C. [Risk management--a new aspect of quality assessment in intensive care medicine: first results of an analysis of the DIVI's interdisciplinary quality assessment research group]. Zentralbl Chir 2007; 131:388-92. [PMID: 17089287 DOI: 10.1055/s-2006-951464] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Patient security has become one of the major aspects of clinical management in recent years. The crucial point in research was focused on malpractice. In contradiction to the economic process in non medical fields, the analysis of errors during the in-patient treatment time was neglected. Patient risk management can be defined as a structured procedure in a clinical unit with the aim to reduce harmful events. A risk point model was created based on a Delphi process and founded on the DIVI data register. The risk point model was evaluated in clinically working ICU departments participating in the register data base. The results of the risk point evaluation will be integrated in the next data base update. This might be a step to improve the reliability of the register to measure quality assessment in the ICU.
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Affiliation(s)
- R Stiletto
- linik für Unfall- Hand- und Wiederherstellungschirurgie der Philipps-Universität Marburg.
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Abstract
AIM To compare the shaping ability of Mtwo rotary nickel-titanium instruments in simulated curved canals and in curved canals of extracted teeth when set into permanent rotation with two different torque-limited automated devices. METHODOLOGY Root canal instrumentation was performed with two different torque-limited automated devices (Mtwo direct handpiece and Endo IT motor) using Mtwo rotary nickel-titanium instruments up to size 35. Simulated canals: 28 degrees and 35 degrees curved canals in resin blocks (n = 20 canals in each group) were prepared. Pre- and post-instrumentation images were recorded and assessment of canal shape was completed with a computer image analysis program. Extracted teeth: a total of 40 curved root canals were divided into two groups, which were balanced with respect to the angle and the radius of canal curvature. Straightening of the canal curvatures was determined with a computer image analysis program. Incidence of canal aberrations, preparation time, changes of working length and instrument failures were recorded both in simulated and real canals and were analysed using the t-test and a chi-square test. RESULTS In simulated canals, instrumentation with Endo IT was significantly faster than with Mtwo direct (P < 0.05). No significant differences between the two devices were noted when all other parameters were assessed (P > 0.05). Only one instrument separated (Mtwo direct) during the enlargement of 28 degrees curved simulated canals. All systems maintained working distance well. CONCLUSIONS Both systems respected original root canal curvature well and were safe, indicating that the Mtwo direct handpiece is suitable for preparing curved root canals with the Mtwo instruments.
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Affiliation(s)
- S Bürklein
- Department of Operative Dentistry, University of Münster, Münster, Germany
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Abstract
Leiomyomas are rare esophageal disorders, although among the benign esophageal neoplasms, they are the most common. Multiple leiomyomas are distinguished from esophageal leiomyomatosis, an extremely rare condition, which is associated with Alport syndrome, showing deletions and rearrangements of the COL4A5/COL4A6 gene. There are only a few reports of diffuse multilocular lesions. A 19-year-old man presented with upper gastrointestinal bleeding and diffuse abdominal pain. On endoscopy multiple nodules covered with intact mucosa were present, the largest tumor arising from the gastro-esophageal border infiltrating the cardia. Barium swallow demonstrated narrowing of the middle and lower esophagus with the upper third of the stomach filled by the tumor. Thorax and abdominal CT scans revealed infiltration of almost the total aboral esophagus by the tumor with compression of left and right bronchi. The infiltration reached the whole lesser curvature of the stomach. Endosonography showed multiple encapsulated nodules. Due to the extended tumor growth with infiltration of the upper third of the stomach, a total esophago-gastrectomy with reconstruction by colon interposition was performed. On histopathological examination multiple esophageal leiomyomas with infiltration of the proximal third of the stomach was shown. Immunohistochemically the tumor stained positive for desmin and sm-actin and negative for CD34 and c-kit. Genetic analysis ruled out a deletion of the COL4A5/COL4A6 locus on chromosome X that is linked with Alport syndrome-diffuse leiomyomatosis. Extended mutations in the COL4A5 gene, associated with Alport syndrome, to the COL4A6 gene, are required for the development of leiomyomatosis. In young patients with diffuse multinodular infiltration by encapsulated tumors, esophageal leiomyomatosis should be considered. If the proximal third of the stomach is infiltrated by the tumor an extended resection is necessary. Reconstruction procedures include colon interposition.
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Affiliation(s)
- K L Prenzel
- Department of Visceral and Vascular Surgery, University of Cologne, Cologne, Germany.
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Abstract
BACKGROUND Postoperative bleeding is the major complication in tonsillectomy, and pain the most common side effect. The use of bipolar scissors versus blunt dissection tonsillectomy were compared in this study in order to evaluate postoperative bleeding and pain, as well as operative time. METHODS In this case control study, 138 patients with the diagnosis of chronic tonsillitis, mononucleosis or a peritonsillar abscess were divided into two groups. A total of 78 patients were operated using bipolar scissors while 60 patients underwent tonsillectomy by blunt dissection. Operating time, frequency of postoperative bleeding and the postoperative pain score were compared between these two groups. RESULTS The average operating time in the bipolar scissor group showed a tendency to be shorter than in the blunt dissection group (mean 4.1 min), although this did not reach a level of statistical significance. No differences were seen in pain scores or in the incidence of postoperative bleeding. CONCLUSION The data documented in this study show that tonsillectomy with bipolar scissors might represent a surgical option to reduce surgical time in a larger patient group. Postoperative pain and the incidence of postoperative bleeding did not show any statistical difference between the two surgical techniques.
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Affiliation(s)
- H v Heyden
- Abteilung für Hals-Nasen-Ohren-Heilkunde, Universitätsklinikum Mainz, Mainz, Germany.
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Hovde D, Schäfer E, Strahan S, Ferrari C, Ray D, Lubic K, Saykally R. Measurement of the rotational spectrum of HF+by laser magnetic resonance. Mol Phys 2006. [DOI: 10.1080/00268978400101181] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Danesh G, Dammaschke T, Gerth HUV, Zandbiglari T, Schäfer E. A comparative study of selected properties of ProRoot mineral trioxide aggregate and two Portland cements. Int Endod J 2006; 39:213-9. [PMID: 16507075 DOI: 10.1111/j.1365-2591.2006.01076.x] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIM To compare solubility, microhardness and radiopacity of ProRoot mineral trioxide aggregate (MTA) with two Portland cements (PC: CEM I and CEM II). METHODOLOGY Solubility: for standardized samples (n = 12/group) ring moulds were filled with the cements. These samples were immersed in double-distilled water for 1 min, 10 min, 1 h, 24 h, 72 h, and 28 days. Mean loss of weight was determined. Microhardness: five samples of each cement were produced. All samples were loaded with a diamond indenter point with a weight of 100 g for 30 s. Radiopacity: five samples per cement were produced. These samples were tested according to the ISO standards to compare their radiodensity to that of an aluminium step wedge (1-9 mm). Differences between the three materials with respect to their solubility, microhardness and radiopacity were analysed using ANOVA and Student-Newman-Keuls. RESULTS After 28 days MTA was of low solubility (0.78%) compared with CEM I (31.38%) and CEM II (33.33%). At exposure times >1 min the two PCs were significantly more soluble than MTA (P < 0.05). The microhardness for MTA was significantly higher (39.99 HV; P < 0.001) compared with the two PC (CEM I: 16.32 HV; CEM II: 13.51 HV). MTA was significantly more radiopaque (5.34 mm Al) than CEM I (3.32 mm Al) and CEM II (2.52 mm Al) (P < 0.05), whereas CEM I was significantly more radiopaque than CEM II (P < 0.05). CONCLUSIONS Mineral trioxide aggregate displayed superior material properties than both Portland cements.
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Affiliation(s)
- G Danesh
- Department of Orthodontics, University of Münster, Münster, Germany
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Schäfer E, Erler M, Dammaschke T. Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo instruments. Part 2. Cleaning effectiveness and shaping ability in severely curved root canals of extracted teeth. Int Endod J 2006; 39:203-12. [PMID: 16507074 DOI: 10.1111/j.1365-2591.2006.01075.x] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.7] [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: 11/29/2022]
Abstract
AIM To compare the cleaning effectiveness and shaping ability of Mtwo, K3, and RaCe nickel-titanium rotary instruments during the preparation of curved root canals in extracted human teeth. METHODOLOGY A total of 60 root canals of mandibular and maxillary molars with curvatures ranging between 25 degrees and 35 degrees were divided into three groups of 20 canals. Based on radiographs taken prior to instrumentation with the initial instrument inserted into the canal, the groups were balanced with respect to the angle and the radius of canal curvature. Canals were prepared using a low-torque control motor. Using pre- and post-instrumentation radiographs, straightening of the canal curvatures was determined with a computer image analysis program. The amount of debris and smear layer was quantified on the basis of a numerical evaluation scale. The data established for scoring the debris and the smear layer was separately recorded and analysed statistically using the Kruskal-Wallis test. RESULTS During preparation no instrument separated. Completely clean root canals were never observed. For debris removal Mtwo instruments achieved significantly better results (P < 0.001) than K3 and RaCe instruments. The results for remaining smear layer were similar and not significantly different (P > 0.05). Mtwo instruments maintained the original canal curvature significantly better (P < 0.05) than the other instruments. Instrumentation with Mtwo files was significantly faster than with K3 or RaCe instruments (P < 0.05). CONCLUSIONS Under the conditions of this study, Mtwo instruments resulted in good cleaning and maintained the original curvature significantly better than K3 or RaCe files.
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Affiliation(s)
- E Schäfer
- Department of Operative Dentistry, University of Münster, Münster, Germany.
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Abstract
BACKGROUND This study was an histological examination of pulp tissue exposed to Carisolv 'new gel' after 1 to 28 days. METHODS An occlusal cavity was prepared in 64 caries-free molar teeth of 16 Wistar rats. The roofs of the pulp chambers were perforated and Carisolv 'new gel' solution was placed onto the exposed pulps of 32 molar teeth for 20 minutes. Thirty-two contralateral molar teeth served as controls and were coated with an inert liquid containing isotonic saline solution and carmellose for 20 minutes as well. The pulps of all teeth were capped with Ca(OH)2 and the cavities were filled with a flowable composite in combination with a self-etching dentine adhesive. The animals were sacrificed after 1, 3, 7 and 28 days. Eight teeth per group and the time period were histologically examined, scored, and statistically evaluated (Wilcoxon-test). RESULTS The results showed no statistically significant differences between the Carisolv group and the control group (p > 0.05). The observed pulp reaction was essentially the same as those reported in the past being typical for the effect of calcium hydroxide as a direct pulp capping agent. CONCLUSION Compared to Ca(OH)2, Carisolv 'new gel' did not cause any different or additional pulp reaction in healthy teeth.
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Affiliation(s)
- T Dammaschke
- Department of Restorative Dentistry, Westphalian Wilhelms-University, Münster, Germany.
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Schäfer E, Erler M, Dammaschke T. Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo instruments. Part 1. Shaping ability in simulated curved canals. Int Endod J 2006; 39:196-202. [PMID: 16507073 DOI: 10.1111/j.1365-2591.2006.01074.x] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [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: 11/27/2022]
Abstract
AIM To compare the shaping ability of Mtwo instruments with K3 and RaCe instruments. Part 1 of this two-part report describes the efficacy of these nickel-titanium instruments in simulated curved root canals. METHODOLOGY Simulated canals with 28 degree and 35 degree curves in resin blocks were prepared with Mtwo instruments using a single length technique and with K3 and RaCe instruments using a crowndown preparation technique (n = 20 canals in each case). Pre- and post-instrumentation images were recorded and assessment of canal shape was completed with a computer image analysis program. Material removal was measured at 20 measuring points, beginning 1 mm from the endpoint of preparation. Incidence of canal aberrations, preparation time, changes of working length and instrument failures were also recorded. The data were analysed statistically using ANOVA and Student-Newman-Keuls test. RESULTS On an average, canals prepared with Mtwo instruments remained better centred compared with those enlarged with K3 or RaCe instruments. Six RaCe instruments, four K3 files and none of the Mtwo instruments fractured during preparation (P > 0.05). In both of the canal types, Mtwo was significantly faster (P < 0.001). It was possible with all types of instruments to control working length as well. CONCLUSIONS Mtwo instruments prepared curved canals rapidly, respected original canal curvature well and were safe to use.
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Affiliation(s)
- E Schäfer
- Department of Operative Dentistry, University of Münster, Münster, Germany.
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Schäfer E, Erler M, Dammaschke T. Influence of different types of automated devices on the shaping ability of rotary nickel-titanium FlexMaster instruments. Int Endod J 2005; 38:627-36. [PMID: 16104976 DOI: 10.1111/j.1365-2591.2005.00995.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [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: 11/28/2022]
Abstract
AIM To compare the shaping ability of rotary FlexMaster nickel-titanium instruments in simulated curved canals and in curved canals of extracted teeth when set into permanent rotation with three different torque-limited automated devices. METHODOLOGY Root canal instrumentation was performed with three different torque-limited automated devices (ENDOadvance, SIRONiTi and Endo IT motor) by FlexMaster nickel-titanium instruments up to size 35. Simulated canals: 28 degree and 35 degree curved canals in resin blocks (n = 20 canals in each group) were prepared. Pre- and post-instrumentation images were recorded and assessment of canal shape was completed with a computer image analysis program. Extracted teeth: A total of 60 curved root canals were divided into three groups, which were balanced with respect to the angle and the radius of canal curvature. Straightening of the canal curvatures was determined with a computer image analysis program. Incidence of canal aberrations, preparation time, changes of working length and instrument failures were recorded both in simulated and real canals. RESULTS In simulated and real canals, instrumentation with Endo IT was significantly faster than with SIRONiTi (P < 0.05). With respect to canal aberrations in simulated canals, there were no significant differences between the devices (P > 0.05), even though more aberrations were created with ENDOadvance and SIRONiTi. In real canals, the Endo IT motor resulted in significantly less straightening during instrumentation (P < 0.05) than SIRONiTi. A total of three instruments separated (one file in each group) during the enlargement of 35 degree curved simulated canals. All systems maintained working distance well. CONCLUSIONS All systems respected original root canal curvature well and were safe, indicating that torque-limited rotation handpieces are suitable for preparing curved root canals.
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Affiliation(s)
- E Schäfer
- Department of Operative Dentistry, University of Münster, Münster, Germany.
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Schäfer E, Vlassis M. Comparative investigation of two rotary nickel-titanium instruments: ProTaper versus RaCe. Part 1. Shaping ability in simulated curved canals. Int Endod J 2004; 37:229-38. [PMID: 15056349 DOI: 10.1111/j.0143-2885.2004.00786.x] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.9] [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: 11/30/2022]
Abstract
AIM To compare the shaping ability of ProTaper with Reamer with Alternating Cutting Edges (RaCe) instruments. Part 1 of this two-part report describes the efficacy of these two nickel-titanium instruments in simulated curved root canals. METHODOLOGY Simulated canals with 28 degrees and 35 degrees curves in resin blocks were prepared with ProTaper and RaCe instruments using a crown-down preparation technique (n = 24 canals in each case). Pre- and postinstrumentation images were recorded, and assessment of canal shape was completed with a computer image analysis program. Material removal was measured at 20 measuring points, beginning 1 mm from the apex. Incidence of canal aberrations, preparation time, changes of working length and instrument failures were also recorded. The data were analysed statistically using the Mann-Whitney U-test or the chi-square test. RESULTS On average, canals prepared with RaCe instruments remained better centred compared with those enlarged with ProTaper files. Three RaCe instruments and two ProTaper files fractured during preparation (P > 0.05). Between both the canal types, RaCe was significantly faster (P < 0.001) than ProTaper and maintained working length significantly better (P < 0.05). CONCLUSION Both instruments prepared curved canals rapidly and were relatively safe. RaCe respected original canal curvature better than ProTaper, which tended to transport towards the outer aspect of the curve.
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Affiliation(s)
- E Schäfer
- Department of Operative Dentistry, University of Münster, Münster, Germany.
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Schäfer E, Vlassis M. Comparative investigation of two rotary nickel-titanium instruments: ProTaper versus RaCe. Part 2. Cleaning effectiveness and shaping ability in severely curved root canals of extracted teeth. Int Endod J 2004; 37:239-48. [PMID: 15056350 DOI: 10.1111/j.0143-2885.2004.00783.x] [Citation(s) in RCA: 111] [Impact Index Per Article: 5.6] [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: 11/30/2022]
Abstract
AIM To determine the cleaning effectiveness and shaping ability of ProTaper and RaCe nickel-titanium rotary instruments during the preparation of curved root canals in extracted human teeth. METHODOLOGY A total of 48 root canals of mandibular and maxillary molars with curvatures ranging between 25 degrees and 35 degrees were divided into two groups of 24 canals each. Based on radiographs taken prior to instrumentation with the initial instrument inserted into the canal, the groups were balanced with respect to the angle and the radius of canal curvature. Canals were prepared using a crown-down preparation technique. After each instrument, the root canals were flushed with a 2.5% NaOCl solution and at the end of instrumentation with NaCl. Using pre- and post-instrumentation radiographs, straightening of the canal curvatures was determined with a computer image analysis program. After splitting the roots longitudinally, the amount of debris and smear layer was quantified on the basis of a numerical evaluation scale, using a scanning electron microscope (SEM). The data established for scoring the debris and the smear layer were separately recorded and analysed statistically using the Wilcoxon test. RESULTS Two ProTaper and three RaCe instruments fractured; there was no significant difference between instrument types (P > 0.05). Completely clean root canals were never observed. For debris removal, RaCe files achieved significantly better results (P < 0.001) than ProTaper instruments. The results for remaining smear layer were similar and not significantly different (P > 0.05). RaCe instruments maintained the original canal curvature significantly better (P < 0.05) than ProTaper instruments. No significant differences were detected between the instruments (P > 0.05) for the time taken to prepare the canals. CONCLUSIONS Under the conditions of this study, RaCe instruments resulted in relatively good cleaning and maintained the original curvature significantly better than ProTaper did.
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Affiliation(s)
- E Schäfer
- Department of Operative Dentistry, University of Münster, Münster, Germany.
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