Konietschke, Frank

[["dc.bibliographiccitation.firstpage","1753"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Clinical Oral Investigations"],["dc.bibliographiccitation.lastpage","1759"],["dc.bibliographiccitation.volume","21"],["dc.contributor.author","Roedig, Tina"],["dc.contributor.author","Endres, Sarah"],["dc.contributor.author","Konietschke, Frank"],["dc.contributor.author","Zimmermann, Ortrud"],["dc.contributor.author","Sydow, Hans Georg"],["dc.contributor.author","Wiegand, Annette"],["dc.date.accessioned","2018-11-07T10:23:17Z"],["dc.date.available","2018-11-07T10:23:17Z"],["dc.date.issued","2017"],["dc.description.abstract","This in vitro study evaluated the effect of fiber insertion depth on antimicrobial efficacy of antimicrobial photodynamic therapy (aPDT) using a photosensitizer (PS; toluidine blue) and a red light-emitting diode (LED) in root canals infected with Enterococcus faecalis. Single-rooted extracted teeth were prepared with nickel-titanium-instruments, sterilized, contaminated with E. faecalis, and incubated for 72 h. Roots were randomly divided into four experimental groups: PS only, LED only, aPDT with LED in the apical third, aPDT with LED in the coronal third, as well as into infection and sterile controls (each n = 10). Samples were taken by collecting standardized dentine shavings from the root canal walls. After serial dilution and culturing on blood agar, colony-forming units (CFU) were counted. Both aPDT groups showed a CFU reduction of 1-2 log(10) steps compared with the infection control, whereas the effect of fiber insertion depth was negligible (< 0.5 log(10) steps). CFU reduction of approximately 0.5 log(10) steps for PS alone was detected compared with the infection control, but PS alone was less effective than both aPDT groups. No antibacterial effect was detected for LED alone. aPDT reduced E. faecalis within the root canal, whereas fiber insertion depth had a negligible influence on antimicrobial effectiveness of aPDT. The insertion depth of the light-emitting diode may not influence the antibacterial efficacy of photodynamic therapy against E. faecalis in straight root canals."],["dc.identifier.doi","10.1007/s00784-016-1948-3"],["dc.identifier.isi","000402011500036"],["dc.identifier.pmid","27591860"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42428"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Springer"],["dc.publisher.place","Heidelberg"],["dc.relation.issn","1436-3771"],["dc.relation.issn","1432-6981"],["dc.title","Effect of fiber insertion depth on antibacterial efficacy of photodynamic therapy against Enterococcus faecalis in rootcanals"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1410"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Journal of Endodontics"],["dc.bibliographiccitation.lastpage","1413"],["dc.bibliographiccitation.volume","36"],["dc.contributor.author","Roedig, Tina"],["dc.contributor.author","Bozkurt, Meral"],["dc.contributor.author","Konietschke, Frank"],["dc.contributor.author","Hülsmann, Michael"],["dc.date.accessioned","2018-11-07T08:40:53Z"],["dc.date.available","2018-11-07T08:40:53Z"],["dc.date.issued","2010"],["dc.description.abstract","Introduction: The aim of this study was to compare the efficiency of a sonic device (Vibringe), syringe irrigation, and passive ultrasonic irrigation in the removal of debris from simulated root canal irregularities. Methods: Root canals with 2 standardized grooves in the apical and coronal parts were filled with dentin debris. Three different irrigation procedures were performed with NaOCl (1%) and (1) syringe irrigation, (2) Vibringe, and (3) passive ultrasonic irrigation. The amount of remaining debris was evaluated by using a 4-grade scoring system. Results: Ultrasonic irrigation removed debris significantly better from the artificial canal irregularities than the Vibringe System and syringe irrigation (P < .0001). The Vibringe System demonstrated significantly better results than syringe irrigation in the apical part of the root canal (P = .011). Conclusions: Passive ultrasonic irrigation is more effective than the Vibringe System or syringe irrigation in removing debris. The sonic device demonstrated significantly better results than syringe irrigation in the apical root canal third. (J Endod 2010;36:1410-1413)"],["dc.identifier.doi","10.1016/j.joen.2010.04.023"],["dc.identifier.isi","000280691900027"],["dc.identifier.pmid","20647107"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19341"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Inc"],["dc.relation.issn","0099-2399"],["dc.title","Comparison of the Vibringe System with Syringe and Passive Ultrasonic Irrigation in Removing Debris from Simulated Root Canal Irregularities"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","197"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","JOURNAL OF ADHESIVE DENTISTRY"],["dc.bibliographiccitation.lastpage","205"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Roedig, Tina"],["dc.contributor.author","Nusime, Anne Kathrin"],["dc.contributor.author","Konietschke, Frank"],["dc.contributor.author","Attin, Thomas"],["dc.date.accessioned","2018-11-07T08:47:53Z"],["dc.date.available","2018-11-07T08:47:53Z"],["dc.date.issued","2010"],["dc.description.abstract","Purpose: To evaluate the bond strength between two fiber posts (FRC Postec and DT Light Post) and different composite resins following different surface treatments of the posts. Materials and Methods: One hundred sixty extracted teeth were divided into sixteen groups (n = 10). After pretreatment of the post surface with (1) no treatment, (2) silanization, (3) sandblasting + silanization or (4) tribochemical coating, the posts were either luted with the resin cements provided by the manufacturers of the post system or with a core buildup material. Push-out tests were performed in a universal testing machine until the post segment was dislodged from the root section. Data were analyzed using ANOVA. Multiple comparisons were performed using Tukey's test. Results: FRC Postec achieved significantly higher bond strengths than DT Light Post (p < 0.0001). Cementation with the core buildup material showed significantly higher bond strengths than the resin cement provided by the post manufacturers (p < 0.0001). Conclusion: Post type, type of surface treatment and type of resin cement were significant factors for bond strength. Luting with a core buildup material significantly increased the bond strengths."],["dc.description.sponsorship","VDW; Ivoclar Vivadent"],["dc.identifier.doi","10.3290/j.jad.a18441"],["dc.identifier.isi","000278999100006"],["dc.identifier.pmid","20589257"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21070"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Quintessence Publishing Co Inc"],["dc.relation.issn","1461-5185"],["dc.title","Effects of Different Luting Agents on Bond Strengths of Fiber-reinforced Composite Posts to Root Canal Dentin"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","942"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","International Endodontic Journal"],["dc.bibliographiccitation.lastpage","948"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Roedig, Tina"],["dc.contributor.author","Reicherts, Philipp"],["dc.contributor.author","Konietschke, Frank"],["dc.contributor.author","Dullin, Christian"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Hülsmann, Michael"],["dc.date.accessioned","2018-11-07T09:34:31Z"],["dc.date.available","2018-11-07T09:34:31Z"],["dc.date.issued","2014"],["dc.description.abstract","AimTo compare the efficacy of reciprocating and rotary NiTi-instruments in removing filling material from curved root canals using micro-computed tomography. MethodologySixty curved root canals were prepared and filled with gutta-percha and sealer. After determination of root canal curvatures and radii in two directions as well as volumes of filling material, the teeth were assigned to three comparable groups (n=20). Retreatment was performed using Reciproc, ProTaper Universal Retreatment or Hedstrom files. Percentages of residual filling material and dentine removal were assessed using micro-CT imaging. Working time and procedural errors were recorded. Statistical analysis was performed by variance procedures. ResultsNo significant differences amongst the three retreatment techniques concerning residual filling material were detected (P>0.05). Hedstrom files removed significantly more dentine than ProTaper Universal Retreatment (P<0.05), but the difference concerning dentine removal between both NiTi systems was not significant (P>0.05). Reciproc and ProTaper Universal Retreatment were significantly faster than Hedstrom files (P=0.0001). No procedural errors such as instrument fracture, blockage, ledging or perforation were detected for Hedstrom files. Three perforations were recorded for ProTaper Universal Retreatment, and in both NiTi groups, one instrument fracture occured. ConclusionsRemnants of filling material were observed in all samples with no significant differences between the three techniques. Hedstrom files removed significantly more dentine than ProTaper Universal Retreatment, but no significant differences between both NiTi systems were detected. Procedural errors were observed with ProTaper Universal Retreatment and Reciproc."],["dc.description.sponsorship","VDW"],["dc.identifier.doi","10.1111/iej.12239"],["dc.identifier.isi","000342852000005"],["dc.identifier.pmid","24386931"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32188"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1365-2591"],["dc.relation.issn","0143-2885"],["dc.title","Efficacy of reciprocating and rotary NiTi instruments for retreatment of curved root canals assessed by micro-CT"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","173"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","International Endodontic Journal"],["dc.bibliographiccitation.lastpage","182"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Roedig, Tina"],["dc.contributor.author","Kupis, J."],["dc.contributor.author","Konietschke, Frank"],["dc.contributor.author","Dullin, Christian"],["dc.contributor.author","Drebenstedt, Steffi"],["dc.contributor.author","Huelsmann, Micbael"],["dc.date.accessioned","2018-11-07T09:44:51Z"],["dc.date.available","2018-11-07T09:44:51Z"],["dc.date.issued","2014"],["dc.description.abstract","AimTo compare the efficacy of hand and rotary nickel-titanium (NiTi) instruments in removing filling material from curved root canals of root filled teeth with unknown preparation parameters. MethodologyNinety mandibular molars with root fillings in curved root canals and homogenous root canal filling extending to 0-2mm short of the radiographic apex were selected. Root canal curvatures and radii were measured in two directions and microcomputed tomography (micro-CT) scans were used to determine preoperative volumes of the filling material. Subsequently, the teeth were assigned to two identical groups (n=14). The root fillings were removed with Hedstrom files or FlexMaster NiTi rotary instruments. Postoperative micro-CT imaging was used to assess the percentage of residual filling material as well as the amount of dentine removal. Working time and procedural errors were recorded. Data were compared using analysis of covariance and analysis of variance procedures. ResultsRoot canals retreated with Hedstrom files were associated with less remaining filling material compared with FlexMaster instruments (P<0.05). Both retreatment techniques removed similar amounts of dentine with no significant differences (P>0.05). FlexMaster instruments were significantly faster than Hedstrom files (P<0.05). No procedural errors were detected in the Hedstrom group, whilst three instruments fractured in the FlexMaster group. ConclusionsHand instrumentation resulted in significantly less residual filling material than retreatment with rotary NiTi instruments. Dentine removal was not significantly different for both techniques. FlexMaster NiTi rotary files were significantly faster than Hedstrom files, but were associated with a higher risk of instrument fracture."],["dc.identifier.doi","10.1111/iej.12128"],["dc.identifier.isi","000329509600008"],["dc.identifier.pmid","23701239"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/34489"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1365-2591"],["dc.relation.issn","0143-2885"],["dc.title","Comparison of hand and rotary instrumentation for removing gutta-percha from previously treated curved root canals: a microcomputed tomography study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","580"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","International Endodontic Journal"],["dc.bibliographiccitation.lastpage","589"],["dc.bibliographiccitation.volume","45"],["dc.contributor.author","Roedig, Tina"],["dc.contributor.author","Hausdoerfer, T."],["dc.contributor.author","Konietschke, Frank"],["dc.contributor.author","Dullin, Christian"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Huelsmann, Micbael"],["dc.date.accessioned","2018-11-07T09:10:06Z"],["dc.date.available","2018-11-07T09:10:06Z"],["dc.date.issued","2012"],["dc.description.abstract","Rodig T, Hausdorfer T, Konietschke F, Dullin C, Hahn W, Hulsmann M. Efficacy of D-RaCe and ProTaper Universal Retreatment NiTi instruments and hand files in removing gutta-percha from curved root canals a micro-computed tomography study. International Endodontic Journal, 45, 580589, 2012. Abstract Aim To compare the efficacy of two rotary NiTi retreatment systems and Hedstrom files in removing filling material from curved root canals. Methodology Curved root canals of 57 extracted teeth were prepared using FlexMaster instruments and filled with gutta-percha and AH Plus. After determination of root canal curvatures and radii in two directions, the teeth were assigned to three identical groups (n = 19). The root fillings were removed with D-RaCe instruments, ProTaper Universal Retreatment instruments or Hedstrom files. Pre- and postoperative micro-CT imaging was used to assess the percentage of residual filling material as well as the amount of dentine removal. Working time and procedural errors were recorded. Data were analysed using analysis of covariance and analysis of variance procedures. Results D-RaCe instruments were significantly more effective than ProTaper Universal Retreatment instruments and Hedstrom files (P < 0.05). Hedstrom files removed significantly less dentine than the rotary NiTi systems (P < 0.0001). D-RaCe instruments were significantly faster compared to both other groups (P < 0.05). No procedural errors such as instrument fracture, blockage, ledging or perforation were detected in the Hedstrom group. In the ProTaper group, four instrument fractures and one lateral perforation were observed. Five instrument fractures were recorded for D-RaCe. Conclusions D-RaCe instruments were associated with significantly less residual filling material than ProTaper Universal Retreatment instruments and hand files. Hedstrom files removed significantly less dentine than both rotary NiTi systems. Retreatment with rotary NiTi systems resulted in a high incidence of procedural errors."],["dc.identifier.doi","10.1111/j.1365-2591.2012.02014.x"],["dc.identifier.isi","000303802400011"],["dc.identifier.pmid","22264204"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26417"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","0143-2885"],["dc.title","Efficacy of D-RaCe and ProTaper Universal Retreatment NiTi instruments and hand files in removing gutta-percha from curved root canals - a micro-computed tomography study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","581"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","International Endodontic Journal"],["dc.bibliographiccitation.lastpage","589"],["dc.bibliographiccitation.volume","43"],["dc.contributor.author","Roedig, Tina"],["dc.contributor.author","Sedghi, M."],["dc.contributor.author","Konietschke, Frank"],["dc.contributor.author","Lange, K."],["dc.contributor.author","Ziebolz, Dirk"],["dc.contributor.author","Huelsmann, Micbael"],["dc.date.accessioned","2018-11-07T08:41:44Z"],["dc.date.available","2018-11-07T08:41:44Z"],["dc.date.issued","2010"],["dc.description.abstract","P>Aim To compare of the efficacy of syringe irrigation, RinsEndo (R) (Durr Dental, Bietigheim, Germany) and passive ultrasonic irrigation (PUI) in the removal of dentinal debris from simulated irregularities in root canals with different apical sizes. Methodology Thirty extracted human pre-molars were randomly divided into three groups (n = 10) followed by root canal preparation with rotary FlexMaster (R) NiTi instruments (VDW, Munich, Germany) to size 30, 0.02 taper (group 1), size 40, 0.02 taper (group 2) or size 50, 0.02 taper (group 3). The teeth were split longitudinally, and a standard groove and three hemispherical-shaped cavities were cut into the root canal halves. Grooves and cavities were filled with dentinal debris before each irrigation procedure and the root halves were reassembled. In all groups three different irrigation procedures were performed with 30 mL NaOCl (1%) and (i) syringe, (ii) RinsEndo (R) and (iii) PUI. The amount of remaining debris was evaluated under a microscope with 30x magnification and a four score system. The data were analysed with a non-parametric analysis of covariance and multiple comparisons using the Tukey adjustment (P = 0.05). Results Passive ultrasonic irrigation removed debris significantly better from the artificial canal irregularities than RinsEndo (R) and syringe irrigation irrespective of the root canal diameter. Only in group 1 (30, 0.02 taper) the difference between PUI and RinsEndo (R) was not statistically significant (P = 0.99). RinsEndo (R) demonstrated significantly better results than syringe irrigation in all groups (P < 0.001). Conclusions Ultrasonic irrigation is more effective than syringe irrigation or RinsEndo (R) in removing debris from artificial extensions in straight root canals."],["dc.identifier.doi","10.1111/j.1365-2591.2010.01721.x"],["dc.identifier.isi","000278566500006"],["dc.identifier.pmid","20636517"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19533"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","0143-2885"],["dc.relation.orgunit","Poliklinik für Präventive Zahnmedizin, Parodontologie und Kariologie"],["dc.title","Efficacy of syringe irrigation, RinsEndo (R) and passive ultrasonic irrigation in removing debris from irregularities in root canals with different apical sizes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","689"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Quintessence International"],["dc.bibliographiccitation.lastpage","697"],["dc.bibliographiccitation.volume","49"],["dc.contributor.author","Rödig, Tina"],["dc.contributor.author","Zimmermann, Felix"],["dc.contributor.author","Konietschke, Frank"],["dc.contributor.author","Sydow, Hans-Georg"],["dc.contributor.author","Wiegand, Annette"],["dc.date.accessioned","2020-05-22T09:34:34Z"],["dc.date.available","2020-05-22T09:34:34Z"],["dc.date.issued","2018"],["dc.description.abstract","Objective: This in-vitro study evaluated the antibacterial efficacy of sonic and ultrasonic irrigation with either intermittent or continuous flush in root canals infected with Enterococcus faecalis. Method and Materials: Seventy single-rooted, extracted teeth with straight root canals were prepared with FlexMaster NiTi-instruments, sterilized, inoculated with E faecalis and incubated for 72 hours. Sixty roots were randomly divided into four experimental groups as well as into infection and sterile controls (n = 10 each). The remaining teeth were used for SEM analysis of smear layer removal (n = 5) and infection with E faecalis (n = 5). Irrigation in the experimental groups was performed with 1% NaOCl and syringe irrigation, sonic activation of the irrigant with EndoActivator, ultrasonic activation with intermittent flush, or ultrasonic activation with continuous flush. Microbial sampling was performed by collecting dentin shavings from the root canal walls. Colony-forming units were counted and statistical analysis was performed using nonparametric rank-based ANOVA-type tests for longitudinal data (P < .05). Results: A significant reduction of E faecalis of 3 log10 steps compared to the infection control was achieved by all irrigation techniques (P < .0001). There were no significant differences in antibacterial efficacy between syringe irrigation, sonically, or ultrasonically activated irrigation (P > .45). Conclusion: Activation of 1% NaOCl with either sonic or ultrasonic devices did not increase the antimicrobial efficacy against E faecalis compared to conventional syringe irrigation in straight root canals."],["dc.identifier.doi","10.3290/j.qi.a40776"],["dc.identifier.pmid","30027169"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65708"],["dc.language.iso","en"],["dc.relation.eissn","1936-7163"],["dc.relation.orgunit","Poliklinik für Präventive Zahnmedizin, Parodontologie und Kariologie"],["dc.title","Comparison of the antibacterial efficacy of sonic- and two ultrasonic-activated irrigation techniques in reducing intracanal Enterococcus faecalis populations"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Clinical Oral Investigations"],["dc.contributor.author","Haupt, Franziska"],["dc.contributor.author","Riggers, Insa"],["dc.contributor.author","Konietschke, Frank"],["dc.contributor.author","Rödig, Tina"],["dc.date.accessioned","2022-01-11T14:05:48Z"],["dc.date.available","2022-01-11T14:05:48Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract Objectives The aim of this study was to evaluate the effectiveness of different fiber post removal techniques and to correlate dentinal loss with microcrack formation. Materials and methods Forty-five extracted single-rooted teeth were root canal treated and fiber posts were adhesively luted. Specimens were divided into three groups ( n  = 15) according to the removal technique: long-shaft round bur (EndoTracer #08, Komet, Lemgo, Germany), SonicFlex Endo (KaVo, Biberach, Germany), DT Post Removal Kit (VDW, Munich, Germany). Roots were scanned before post cementation and after post removal using micro-computed tomography. Dentin loss, residual luting material, working time, and the induction of microcracks were assessed. Statistical analysis was performed by using multiple contrast tests (max- t tests, α  = 0.05). Correlations between parameters dentin loss/new microcracks and dentin loss/residual material were calculated using Kendall’s tau. Results Post removal with SonicFlex Endo resulted in the highest amount of removed dentin with significant differences to the round bur and the DT Post Removal Kit. No technique was found to completely remove the post and luting material. All techniques induced microcracks with the DT Post Removal Kit presenting the highest number of new defects. No correlation between dentin loss and new microcracks was observed. Deviations from the original root canal occurred in all groups, but no perforation was observed. Conclusions All techniques resulted in dentin loss, residual luting material, and the formation of microcracks. However, no correlation between dentin loss and the induction of microcracks was observed. Clinical relevance As all techniques resulted in microcrack formation and dentin loss, this study emphasizes the risk of iatrogenic damage due to post removal procedures."],["dc.description.abstract","Abstract Objectives The aim of this study was to evaluate the effectiveness of different fiber post removal techniques and to correlate dentinal loss with microcrack formation. Materials and methods Forty-five extracted single-rooted teeth were root canal treated and fiber posts were adhesively luted. Specimens were divided into three groups ( n  = 15) according to the removal technique: long-shaft round bur (EndoTracer #08, Komet, Lemgo, Germany), SonicFlex Endo (KaVo, Biberach, Germany), DT Post Removal Kit (VDW, Munich, Germany). Roots were scanned before post cementation and after post removal using micro-computed tomography. Dentin loss, residual luting material, working time, and the induction of microcracks were assessed. Statistical analysis was performed by using multiple contrast tests (max- t tests, α  = 0.05). Correlations between parameters dentin loss/new microcracks and dentin loss/residual material were calculated using Kendall’s tau. Results Post removal with SonicFlex Endo resulted in the highest amount of removed dentin with significant differences to the round bur and the DT Post Removal Kit. No technique was found to completely remove the post and luting material. All techniques induced microcracks with the DT Post Removal Kit presenting the highest number of new defects. No correlation between dentin loss and new microcracks was observed. Deviations from the original root canal occurred in all groups, but no perforation was observed. Conclusions All techniques resulted in dentin loss, residual luting material, and the formation of microcracks. However, no correlation between dentin loss and the induction of microcracks was observed. Clinical relevance As all techniques resulted in microcrack formation and dentin loss, this study emphasizes the risk of iatrogenic damage due to post removal procedures."],["dc.identifier.doi","10.1007/s00784-021-04338-0"],["dc.identifier.pii","4338"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/97750"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-507"],["dc.relation.eissn","1436-3771"],["dc.relation.issn","1432-6981"],["dc.title","Effectiveness of different fiber post removal techniques and their influence on dentinal microcrack formation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1983"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Journal of Endodontics"],["dc.bibliographiccitation.lastpage","1987"],["dc.bibliographiccitation.volume","36"],["dc.contributor.author","Roedig, Tina"],["dc.contributor.author","Doellmann, Stefan"],["dc.contributor.author","Konietschke, Frank"],["dc.contributor.author","Drebenstedt, Steffi"],["dc.contributor.author","Huelsmann, Michael"],["dc.date.accessioned","2018-11-07T08:36:21Z"],["dc.date.available","2018-11-07T08:36:21Z"],["dc.date.issued","2010"],["dc.description.abstract","Introduction: The aim of this study was to evaluate the cleaning efficacy of different irrigant agitation techniques on debris and smear layer removal in curved root canals. Methods: Mesiobuccal root canals of 108 mandibular molars were shaped with nickel-titanium instruments, and a final rinse of NaOCl and ethylenediaminetetraacetic acid was performed. Specimens were assigned to 4 groups (n = 20) and submitted to the following irrigation agitation techniques: no agitation (control), ultrasonic, Endo Activator, and CanalBrush. Root canals were split longitudinally and subjected to scanning electron microscopy. The presence of debris and smear layer at coronal and apical levels was evaluated by using a 5-grade scoring system with 200x and 1000 x magnification, respectively. Results: Concerning debris removal, no significant differences among groups were detected. In the coronal region, agitation of the irrigants resulted in significantly more smear layer removal than the control. EndoActivator was significantly more effective than ultrasonic agitation and CanalBrush. Conclusions: In curved root canals, activation of NaOCl and ethylenediaminetetraacetic acid did not enhance debris removal but resulted in significantly more effective smear layer removal at coronal levels. (J Endod 2010;36:1983-1987)"],["dc.identifier.doi","10.1016/j.joen.2010.08.056"],["dc.identifier.isi","000285124400011"],["dc.identifier.pmid","21092817"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18288"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Inc"],["dc.relation.issn","0099-2399"],["dc.relation.orgunit","Poliklinik für Präventive Zahnmedizin, Parodontologie und Kariologie"],["dc.title","Effectiveness of Different Irrigant Agitation Techniques on Debris and Smear Layer Removal in Curved Root Canals: A Scanning Electron Microscopy Study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]