Markus Altenburger - Academia.edu (original) (raw)

Papers by Markus Altenburger

Research paper thumbnail of Direct EPR detection of atomic nitrogen in an atmospheric nitrogen plasma jet

Physical Chemistry Chemical Physics, 2020

A nitrogen plasma generated by a self-designed microplasma device was analyzed by cw and pulse EP... more A nitrogen plasma generated by a self-designed microplasma device was analyzed by cw and pulse EPR spectroscopy in real time. Nitrogen atoms were detected and characterized in terms of spectral widths, relaxation times and actual concentrations.

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Research paper thumbnail of New Bacterial Composition in Primary and Persistent/Secondary Endodontic Infections with Respect to Clinical and Radiographic Findings

Journal of Endodontics, 2014

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Research paper thumbnail of Effect of Photoactivated Chemotherapy Using A Modified Photosensitizer in Endodontics

Objectives: To determine the antibacterial effect of photoactivated chemotherapy (PACT) in combin... more Objectives: To determine the antibacterial effect of photoactivated chemotherapy (PACT) in combination with a modified photosensitizer on Enterococcus faecalis biofilms in experimentally infected root canals. Methods: 50 single-rooted extracted teeth with one root canal were flared using ProTaper instruments. Apical flaring was performed terminating with ProTaper F2 file. Teeth were embedded in methacrylate, autoclaved and infected with a clinical isolate of E. faecalis for 72 hours. Samples were taken using paper points to determine the presence of E. faecalis in the root canals. For the antimicrobial treatment the teeth were devided into two groups. In the first group root canals were treated using the PACT system (Cumdente, Germany), consisting of the PACT light source at 635 nm in combination with the photosensitizer, a 15 µg/mL tolonium chloride solution and sampled with paper points. In the second group root canals were treated using the PACT light source in combination with a...

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Research paper thumbnail of Remineralization Of Dentin Surfaces After Application Of Chlorhexidine And Fluoride

Objectives: The purpose of this randomized, cross-over in-situ study was to determine the reminer... more Objectives: The purpose of this randomized, cross-over in-situ study was to determine the remineralization of demineralized dentin specimens after application of 1% chlorhexidine varnish (Cervitec®) or 10% fluoride salt(Bifluorid 10®). Methods: Fifteen subjects without current caries activity (3 male, 12 female; mean age: 32.51 ± 11.83 years) wore removable appliances in the lower jaw containing four human demineralized dentine specimens fixed in the buccal aspects of the appliances for a period of four weeks. The dentin specimens were obtained from the cervical regions of extracted human third molars. After demineralization, half the surface of the specimens was covered with an acid-resistant nail varnish, serving as the control surface. The dentin specimens were randomly assigned to one of the three groups: 10 % fluoride salt (Bifluorid 10®, F), 1% Chlorhexidine (Cervitec®, CHX) and control group (without treatment, C). Before the first and between each treatment periods there wer...

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Research paper thumbnail of Mature biofilm composition on demineralized and on infiltrated bovine enamel

Objective: The infiltration of initial carious lesions has become a successful micro-invasive met... more Objective: The infiltration of initial carious lesions has become a successful micro-invasive method to inhibit further caries progression. As previously shown, the initial and long-term biofilm formation on demineralized (=carious) and on infiltrated surfaces, respectively, varies greatly. While some individuals display significantly more biofilm on infiltrated surfaces, the objective of this study was to investigate if the composition of the biofilm differs within these two groups. Method: Bovine enamel specimen (ø 5mm) were demineralized only (group 1) or demineralized and infiltrated (group 2). These specimen were worn within intra-oral splints by healthy volunteers for 3 days (six specimen per volunteer). After 72 hrs, the specimen underwent fluorescence-in-situ-hybridization (FISH) and were evaluated via confocal laser scanning microscopy (CLSM). Eubacteria in general, Streptococcus spp., Veillonella spp., Actinomyces naeslundii and Fusobacterium nucleatum were selected for in...

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Research paper thumbnail of Effect of adhesive resin cements and post surface silanization on the bond strengths of adhesively inserted fiber posts

Journal of endodontics, 2007

This study evaluated the tensile bond strengths and the effect of silanization of fiber posts ins... more This study evaluated the tensile bond strengths and the effect of silanization of fiber posts inserted with different adhesive systems. Sixty DT Light Posts (size 1) were used. Thirty posts were pretreated with silane. The posts were cemented into form-congruent artificial root canals (12 mm) of bovine dentine. Six groups were formed: G1, Prime&Bond NT/Calibra; G2, Monobond-S+Prime&Bond NT/Calibra; G3, ED Primer/Panavia 21ex; G4, Monobond-S+ED Primer/Panavia 21ex; G5, RelyX Unicem; and G6, Monobond-S+RelyX Unicem. The mean (standard deviation) tensile bond strengths (megapascals) were 7.69 (0.85) for G1, 7.15 (1.01) for G2, 6.73 (0.85) for G3, 6.78 (0.97) for G4, 4.79 (0.58) for G5, and 4.74 (0.88) for G6. G1 achieved significantly higher bond strengths than G3 and G5; G3 had significantly higher values than G5 (P < .05; Scheffé procedure). Silanization had no significant effect (P > .05, one-way analysis of variance). Tensile bond strengths were significantly influenced by th...

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Research paper thumbnail of Apical quality and adaptation of Resilon, EndoREZ, and Guttaflow root canal fillings in combination with a noncompaction technique

Journal of endodontics, 2009

The objective of this study was to compare the quality of Guttaflow (Coltene/Whaledent, Langenau,... more The objective of this study was to compare the quality of Guttaflow (Coltene/Whaledent, Langenau, Germany), Resilon/Epiphany (Jeneric/Pentron, Kusterdingen, Germany), and EndoREZ (Ultradent Products, Inc, South Jordan, UT) root canal fillings. Thirty single-rooted teeth were randomly assigned to three groups: Resilon/Epiphany, EndoREZ, and Guttaflow. After radiography of the root canal fillings, the roots were sectioned horizontally at the level of 2 mm and 4 mm from the apex. The area of voids and adaptation to canal walls and points were evaluated using light microscopy and calculated through a computer program. The radiographs showed no significant differences between the materials (p > 0.05, Mann-Whitney U test). Evaluation of cross-sections revealed sealer adaptation >99% to the root canals and >98% to the points. Resilon/Epiphany had significantly higher values at 98.8% (standard deviation [SD] = 3.9%) than EndoREZ at 98.7% (SD = 1.1%), and Guttaflow at 98.5 (SD = 2.1...

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Research paper thumbnail of Shaping ability and safety of five different rotary nickel-titanium instruments compared with stainless steel hand instrumentation in simulated curved root canals

Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics, 2006

To compare the shaping ability and safety of engine-driven FlexMaster, GT Rotary, ProFile, ProTap... more To compare the shaping ability and safety of engine-driven FlexMaster, GT Rotary, ProFile, ProTaper, and RaCe rotary instrumentation and Hedström hand instrumentation in simulated root canals. One hundred fifty simulated colored root canals with a curvature of 20 degrees and a radius of 10 mm were randomly distributed among 6 groups of 25 specimens each. After preparation to apical size 30 the area of remaining color on the canal wall indicating unprepared areas was measured in mm2 using image analyzer software. Specimens treated with RaCe left least areas of remaining color compared to all other groups (P < .001), followed by ProTaper. Preparation with ProFile left behind the highest amount of unprepared areas. The ProFile group revealed significantly more remaining color than ProTaper, GT Rotary, and FlexMaster (P < .05). Four FlexMaster files separated. RaCe rotary files were safe and more effective compared to the other instruments.

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Research paper thumbnail of Efficacy of different rotary instruments for gutta-percha removal in root canal retreatment

Journal of endodontics, 2006

The purpose of this study was to evaluate the efficiency of FlexMaster, ProTaper, and RaCe rotary... more The purpose of this study was to evaluate the efficiency of FlexMaster, ProTaper, and RaCe rotary instruments compared with Hedström files for removal of gutta-percha during retreatment. Sixty mandibular premolars with one single straight canal were instrumented with K-type files and filled using cold lateral compaction and sealer. The teeth were randomly divided into four groups of 15 specimens each. After repreparation with Gates Glidden burs and the test instruments the specimens were cleared. The area of remaining gutta-percha/sealer on the root canal wall was measured from two directions. The RaCe group showed significantly less residual obturation material than FlexMaster and Hedström group (p < 0.05; closed test procedure). There was no difference between ProTaper and all other instruments (p > 0.05). ProTaper and RaCe instruments required significantly less time for retreatment than FlexMaster and Hedström files (p < 0.05). One RaCe file, two ProTaper, and two FlexM...

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Research paper thumbnail of Antimicrobial Effects of Dental Luting Glass Ionomer Cements on Streptococcus mutans

The Scientific World Journal, 2014

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Research paper thumbnail of Bacterial and Candida albicans Adhesion on Different Root Canal Filling Materials and Sealers

Journal of Endodontics, 2011

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Research paper thumbnail of Effectiveness of a hand file and three nickel-titanium rotary instruments for removing gutta-percha in curved root canals during retreatment

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 2006

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Research paper thumbnail of Demineralization Effects of 2 Bleaching Procedures on Enamel Surfaces With and Without Post-treatment Fluoride Application

Operative Dentistry, 2006

In this in vitro study, the demineralization effect of 2 different bleaching procedures on enamel... more In this in vitro study, the demineralization effect of 2 different bleaching procedures on enamel surfaces with and without the post-treatment application of fluoride was determined. Bovine enamel specimens (n= 180) were ground flat, polished and divided into 6 groups. Group A (n=30) specimens were bleached with Opalescence, 10% carbamide peroxide (Ultradent Products, Inc) for 8 hours daily for 2 weeks; Group B (n=30) specimens were treated with Whitestrips, 5.3% hydrogen peroxide (Procter &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp; Gamble) for 1 hour daily for 2 weeks; Group C (n=30): the same as Group A, but after bleaching, a fluoride varnish was applied on the specimens and left for 1 hour (Duraphat, 2.26% F-); Group D (n=30): the same as Group B, followed by the same fluoride application as Group C; Group E (n=30): the specimens were covered with a glycerin gel as a control group; Group F (n=30): specimens were kept in Coca Cola 1 hour daily for 2 weeks. The mineral loss (vol% microm) and lesion depth (microm) were measured by microradiography. Data analysis was accomplished using the Kolmogorov-Smirnov, Kruskal-Wallis and Mann-Whitney U tests (p&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.05) (SPSS 11.0). The median mineral loss was statistically significantly higher in the non-fluoride groups (A: 271.20 vs C: 128.00 and B: 364.90 vs D: 151.10). The highest mineral loss was found in Group F (581.85 vol% microm) and was lowest in Group E (32.80 vol% microm). No statistically significant difference between groups was found for lesion depth.

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Research paper thumbnail of The Effect of Cervical Preflaring Using Different Rotary Nickel-Titanium Systems on the Accuracy of Apical File Size Determination

Journal of Endodontics, 2010

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Research paper thumbnail of New Bacterial Composition in Primary and Persistent/Secondary Endodontic Infections with Respect to Clinical and Radiographic Findings

Journal of Endodontics, 2014

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Research paper thumbnail of Evaluation of an improved endodontic teaching model: do preclinical exercises have an influence on the technical quality of root canal treatments?

International Endodontic Journal, 2014

To investigate whether the preclinical application of an electronic root canal length measurement... more To investigate whether the preclinical application of an electronic root canal length measurement device (ERCLMD) leads to more accurate working length (WL) determinations in a preclinical endodontic course and if this exercise effects the technical quality of root canal procedures when treatments are performed on patients for the first time. Root canal treatments performed by two consecutive groups of third year students (group 1: n = 39, group 2: n = 44) were compared in the preclinical course and when root canal treatments were performed on patients in the following term. Two different teaching models were applied in the preclinical endodontic course. WL in group 1 was determined with radiographs only. The teaching model applied in group 2 allowed the application of an ERCLMD. When treatments were performed on patients, both groups used the same technique to determine WL. It was first determined using an ERCLMD and verified radiographically. Master cone and root filling lengths were evaluated using radiographs, and comparisons between both groups were made using Fischer&#39;s exact test. Root fillings performed by students of group 2 were more often classified as acceptable. This observation was made in the preclinical endodontic course and when treatments were performed on patients. The application of an ERCLMD in combination with radiographs is more accurate to determine WL than radiographs alone. Students practiced the use of ERCLMDs with the new model and benefited from this experience when performing their first root canal treatments on patients.

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Research paper thumbnail of Effectiveness of hand and rotary instrumentation for removing a new synthetic polymer-based root canal obturation material (Epiphany) during retreatment

International Endodontic Journal, 2006

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Research paper thumbnail of Bond strength between fibre posts and composite resin cores: effect of post surface silanization

International Endodontic Journal, 2007

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Research paper thumbnail of Cleanliness of dentinal tubules following gutta-percha removal with and without solvents: a scanning electron microscopic study

International Endodontic Journal, 2009

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Research paper thumbnail of In vivo comparison of working length determination with two electronic apex locators

International Endodontic Journal, 2007

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Research paper thumbnail of Direct EPR detection of atomic nitrogen in an atmospheric nitrogen plasma jet

Physical Chemistry Chemical Physics, 2020

A nitrogen plasma generated by a self-designed microplasma device was analyzed by cw and pulse EP... more A nitrogen plasma generated by a self-designed microplasma device was analyzed by cw and pulse EPR spectroscopy in real time. Nitrogen atoms were detected and characterized in terms of spectral widths, relaxation times and actual concentrations.

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Research paper thumbnail of New Bacterial Composition in Primary and Persistent/Secondary Endodontic Infections with Respect to Clinical and Radiographic Findings

Journal of Endodontics, 2014

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Research paper thumbnail of Effect of Photoactivated Chemotherapy Using A Modified Photosensitizer in Endodontics

Objectives: To determine the antibacterial effect of photoactivated chemotherapy (PACT) in combin... more Objectives: To determine the antibacterial effect of photoactivated chemotherapy (PACT) in combination with a modified photosensitizer on Enterococcus faecalis biofilms in experimentally infected root canals. Methods: 50 single-rooted extracted teeth with one root canal were flared using ProTaper instruments. Apical flaring was performed terminating with ProTaper F2 file. Teeth were embedded in methacrylate, autoclaved and infected with a clinical isolate of E. faecalis for 72 hours. Samples were taken using paper points to determine the presence of E. faecalis in the root canals. For the antimicrobial treatment the teeth were devided into two groups. In the first group root canals were treated using the PACT system (Cumdente, Germany), consisting of the PACT light source at 635 nm in combination with the photosensitizer, a 15 µg/mL tolonium chloride solution and sampled with paper points. In the second group root canals were treated using the PACT light source in combination with a...

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Research paper thumbnail of Remineralization Of Dentin Surfaces After Application Of Chlorhexidine And Fluoride

Objectives: The purpose of this randomized, cross-over in-situ study was to determine the reminer... more Objectives: The purpose of this randomized, cross-over in-situ study was to determine the remineralization of demineralized dentin specimens after application of 1% chlorhexidine varnish (Cervitec®) or 10% fluoride salt(Bifluorid 10®). Methods: Fifteen subjects without current caries activity (3 male, 12 female; mean age: 32.51 ± 11.83 years) wore removable appliances in the lower jaw containing four human demineralized dentine specimens fixed in the buccal aspects of the appliances for a period of four weeks. The dentin specimens were obtained from the cervical regions of extracted human third molars. After demineralization, half the surface of the specimens was covered with an acid-resistant nail varnish, serving as the control surface. The dentin specimens were randomly assigned to one of the three groups: 10 % fluoride salt (Bifluorid 10®, F), 1% Chlorhexidine (Cervitec®, CHX) and control group (without treatment, C). Before the first and between each treatment periods there wer...

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Research paper thumbnail of Mature biofilm composition on demineralized and on infiltrated bovine enamel

Objective: The infiltration of initial carious lesions has become a successful micro-invasive met... more Objective: The infiltration of initial carious lesions has become a successful micro-invasive method to inhibit further caries progression. As previously shown, the initial and long-term biofilm formation on demineralized (=carious) and on infiltrated surfaces, respectively, varies greatly. While some individuals display significantly more biofilm on infiltrated surfaces, the objective of this study was to investigate if the composition of the biofilm differs within these two groups. Method: Bovine enamel specimen (ø 5mm) were demineralized only (group 1) or demineralized and infiltrated (group 2). These specimen were worn within intra-oral splints by healthy volunteers for 3 days (six specimen per volunteer). After 72 hrs, the specimen underwent fluorescence-in-situ-hybridization (FISH) and were evaluated via confocal laser scanning microscopy (CLSM). Eubacteria in general, Streptococcus spp., Veillonella spp., Actinomyces naeslundii and Fusobacterium nucleatum were selected for in...

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Research paper thumbnail of Effect of adhesive resin cements and post surface silanization on the bond strengths of adhesively inserted fiber posts

Journal of endodontics, 2007

This study evaluated the tensile bond strengths and the effect of silanization of fiber posts ins... more This study evaluated the tensile bond strengths and the effect of silanization of fiber posts inserted with different adhesive systems. Sixty DT Light Posts (size 1) were used. Thirty posts were pretreated with silane. The posts were cemented into form-congruent artificial root canals (12 mm) of bovine dentine. Six groups were formed: G1, Prime&Bond NT/Calibra; G2, Monobond-S+Prime&Bond NT/Calibra; G3, ED Primer/Panavia 21ex; G4, Monobond-S+ED Primer/Panavia 21ex; G5, RelyX Unicem; and G6, Monobond-S+RelyX Unicem. The mean (standard deviation) tensile bond strengths (megapascals) were 7.69 (0.85) for G1, 7.15 (1.01) for G2, 6.73 (0.85) for G3, 6.78 (0.97) for G4, 4.79 (0.58) for G5, and 4.74 (0.88) for G6. G1 achieved significantly higher bond strengths than G3 and G5; G3 had significantly higher values than G5 (P < .05; Scheffé procedure). Silanization had no significant effect (P > .05, one-way analysis of variance). Tensile bond strengths were significantly influenced by th...

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Research paper thumbnail of Apical quality and adaptation of Resilon, EndoREZ, and Guttaflow root canal fillings in combination with a noncompaction technique

Journal of endodontics, 2009

The objective of this study was to compare the quality of Guttaflow (Coltene/Whaledent, Langenau,... more The objective of this study was to compare the quality of Guttaflow (Coltene/Whaledent, Langenau, Germany), Resilon/Epiphany (Jeneric/Pentron, Kusterdingen, Germany), and EndoREZ (Ultradent Products, Inc, South Jordan, UT) root canal fillings. Thirty single-rooted teeth were randomly assigned to three groups: Resilon/Epiphany, EndoREZ, and Guttaflow. After radiography of the root canal fillings, the roots were sectioned horizontally at the level of 2 mm and 4 mm from the apex. The area of voids and adaptation to canal walls and points were evaluated using light microscopy and calculated through a computer program. The radiographs showed no significant differences between the materials (p > 0.05, Mann-Whitney U test). Evaluation of cross-sections revealed sealer adaptation >99% to the root canals and >98% to the points. Resilon/Epiphany had significantly higher values at 98.8% (standard deviation [SD] = 3.9%) than EndoREZ at 98.7% (SD = 1.1%), and Guttaflow at 98.5 (SD = 2.1...

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Research paper thumbnail of Shaping ability and safety of five different rotary nickel-titanium instruments compared with stainless steel hand instrumentation in simulated curved root canals

Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics, 2006

To compare the shaping ability and safety of engine-driven FlexMaster, GT Rotary, ProFile, ProTap... more To compare the shaping ability and safety of engine-driven FlexMaster, GT Rotary, ProFile, ProTaper, and RaCe rotary instrumentation and Hedström hand instrumentation in simulated root canals. One hundred fifty simulated colored root canals with a curvature of 20 degrees and a radius of 10 mm were randomly distributed among 6 groups of 25 specimens each. After preparation to apical size 30 the area of remaining color on the canal wall indicating unprepared areas was measured in mm2 using image analyzer software. Specimens treated with RaCe left least areas of remaining color compared to all other groups (P < .001), followed by ProTaper. Preparation with ProFile left behind the highest amount of unprepared areas. The ProFile group revealed significantly more remaining color than ProTaper, GT Rotary, and FlexMaster (P < .05). Four FlexMaster files separated. RaCe rotary files were safe and more effective compared to the other instruments.

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Research paper thumbnail of Efficacy of different rotary instruments for gutta-percha removal in root canal retreatment

Journal of endodontics, 2006

The purpose of this study was to evaluate the efficiency of FlexMaster, ProTaper, and RaCe rotary... more The purpose of this study was to evaluate the efficiency of FlexMaster, ProTaper, and RaCe rotary instruments compared with Hedström files for removal of gutta-percha during retreatment. Sixty mandibular premolars with one single straight canal were instrumented with K-type files and filled using cold lateral compaction and sealer. The teeth were randomly divided into four groups of 15 specimens each. After repreparation with Gates Glidden burs and the test instruments the specimens were cleared. The area of remaining gutta-percha/sealer on the root canal wall was measured from two directions. The RaCe group showed significantly less residual obturation material than FlexMaster and Hedström group (p < 0.05; closed test procedure). There was no difference between ProTaper and all other instruments (p > 0.05). ProTaper and RaCe instruments required significantly less time for retreatment than FlexMaster and Hedström files (p < 0.05). One RaCe file, two ProTaper, and two FlexM...

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Research paper thumbnail of Antimicrobial Effects of Dental Luting Glass Ionomer Cements on Streptococcus mutans

The Scientific World Journal, 2014

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Research paper thumbnail of Bacterial and Candida albicans Adhesion on Different Root Canal Filling Materials and Sealers

Journal of Endodontics, 2011

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Research paper thumbnail of Effectiveness of a hand file and three nickel-titanium rotary instruments for removing gutta-percha in curved root canals during retreatment

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 2006

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Research paper thumbnail of Demineralization Effects of 2 Bleaching Procedures on Enamel Surfaces With and Without Post-treatment Fluoride Application

Operative Dentistry, 2006

In this in vitro study, the demineralization effect of 2 different bleaching procedures on enamel... more In this in vitro study, the demineralization effect of 2 different bleaching procedures on enamel surfaces with and without the post-treatment application of fluoride was determined. Bovine enamel specimens (n= 180) were ground flat, polished and divided into 6 groups. Group A (n=30) specimens were bleached with Opalescence, 10% carbamide peroxide (Ultradent Products, Inc) for 8 hours daily for 2 weeks; Group B (n=30) specimens were treated with Whitestrips, 5.3% hydrogen peroxide (Procter &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp; Gamble) for 1 hour daily for 2 weeks; Group C (n=30): the same as Group A, but after bleaching, a fluoride varnish was applied on the specimens and left for 1 hour (Duraphat, 2.26% F-); Group D (n=30): the same as Group B, followed by the same fluoride application as Group C; Group E (n=30): the specimens were covered with a glycerin gel as a control group; Group F (n=30): specimens were kept in Coca Cola 1 hour daily for 2 weeks. The mineral loss (vol% microm) and lesion depth (microm) were measured by microradiography. Data analysis was accomplished using the Kolmogorov-Smirnov, Kruskal-Wallis and Mann-Whitney U tests (p&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.05) (SPSS 11.0). The median mineral loss was statistically significantly higher in the non-fluoride groups (A: 271.20 vs C: 128.00 and B: 364.90 vs D: 151.10). The highest mineral loss was found in Group F (581.85 vol% microm) and was lowest in Group E (32.80 vol% microm). No statistically significant difference between groups was found for lesion depth.

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Research paper thumbnail of The Effect of Cervical Preflaring Using Different Rotary Nickel-Titanium Systems on the Accuracy of Apical File Size Determination

Journal of Endodontics, 2010

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Research paper thumbnail of New Bacterial Composition in Primary and Persistent/Secondary Endodontic Infections with Respect to Clinical and Radiographic Findings

Journal of Endodontics, 2014

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Research paper thumbnail of Evaluation of an improved endodontic teaching model: do preclinical exercises have an influence on the technical quality of root canal treatments?

International Endodontic Journal, 2014

To investigate whether the preclinical application of an electronic root canal length measurement... more To investigate whether the preclinical application of an electronic root canal length measurement device (ERCLMD) leads to more accurate working length (WL) determinations in a preclinical endodontic course and if this exercise effects the technical quality of root canal procedures when treatments are performed on patients for the first time. Root canal treatments performed by two consecutive groups of third year students (group 1: n = 39, group 2: n = 44) were compared in the preclinical course and when root canal treatments were performed on patients in the following term. Two different teaching models were applied in the preclinical endodontic course. WL in group 1 was determined with radiographs only. The teaching model applied in group 2 allowed the application of an ERCLMD. When treatments were performed on patients, both groups used the same technique to determine WL. It was first determined using an ERCLMD and verified radiographically. Master cone and root filling lengths were evaluated using radiographs, and comparisons between both groups were made using Fischer&#39;s exact test. Root fillings performed by students of group 2 were more often classified as acceptable. This observation was made in the preclinical endodontic course and when treatments were performed on patients. The application of an ERCLMD in combination with radiographs is more accurate to determine WL than radiographs alone. Students practiced the use of ERCLMDs with the new model and benefited from this experience when performing their first root canal treatments on patients.

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Research paper thumbnail of Effectiveness of hand and rotary instrumentation for removing a new synthetic polymer-based root canal obturation material (Epiphany) during retreatment

International Endodontic Journal, 2006

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Research paper thumbnail of Bond strength between fibre posts and composite resin cores: effect of post surface silanization

International Endodontic Journal, 2007

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Research paper thumbnail of Cleanliness of dentinal tubules following gutta-percha removal with and without solvents: a scanning electron microscopic study

International Endodontic Journal, 2009

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Research paper thumbnail of In vivo comparison of working length determination with two electronic apex locators

International Endodontic Journal, 2007

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