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Ove A Peters - One of the best experts on this subject based on the ideXlab platform.
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micro computed tomography evaluation of the preparation of long oval root Canals in mandibular molars with the self adjusting file
Journal of Endodontics, 2011Co-Authors: Frank Paque, Ove A PetersAbstract:Abstract Introduction The aim of this study was to assess the shaping potential of a novel nickel-titanium instrument, the self-adjusting file (SAF), in long oval root Canals in distal roots in mandibular molars. Methods Twenty mandibular molars with long oval distal root Canals were selected and scanned preoperatively and postoperatively by using micro–computed tomography at an original resolution of 20 μm. Canals were shaped with the SAF, three-dimensionally reconstructed, and evaluated for volume, surface area, canal transportation, and prepared surface. Data were statistically contrasted by using paired t tests and regression analysis. Results Preoperatively, canal volume was 7.73 ± 2.13 mm 3 , and canal area was 42.83 ± 8.14 mm 2 . Volumes and surface areas increased significantly ( P 3 and 3.34 ± 1.73 mm 2 , respectively, and no gross preparation errors were detected. Unprepared canal surface varied between individual Canals, and mean unprepared surface was 23.5% ± 8.9%. Prepared areas were significantly larger compared with rotary canal preparation done in a previous study. Canal transportation scores were higher in the coronal root canal third (106 ± 50 μm) compared with the apical third (81 ± 49 μm). Conclusions In vitro , preparation of long oval-shaped root Canals in mandibular molars with the SAF was effective and safe. Moreover, shapes generated with the SAF were more complete compared with rotary canal preparation.
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root canal preparation of maxillary molars with the self adjusting file a micro computed tomography study
Journal of Endodontics, 2011Co-Authors: Ove A Peters, Frank PaqueAbstract:Introduction: The aim of this study was to describe the canal shaping properties of a novel nickel-titanium instrument, the self-adjusting file (SAF), in maxillary molars. Methods: Twenty maxillary molars were scanned by using micro‐computed tomography at 20mm resolution. Canals were shaped with the SAF, which was operated with continuous irrigation in a handpiece that provided an in-and-out vibrating movement. Changes in canal volumes, surface areas, and crosssectional geometry were compared with preoperative values. Canal transportation and the fraction of unprepared canal surface area were also determined. Data were normally distributed and compared by analyses of variance. Results: Preoperatively, mean canal volumes were 2.88 1.32, 1.50 0.99, and 4.30 1.89 mm 3 for mesiobuccal (MB), distobuccal (DB), and palatal (P) Canals, respectively; these values were statistically similar to earlier studies with the same protocol. Volumes and surface areas increased significantly in MB, DB, and P Canals; mean canal transportation scores in the apical and middle root canal thirds ranged between 31 and 89 mm. Mean unprepared surfaces were 25.8% 12.4%, 22.1% 12.0%, and 25.2% 11.3% in MB, DB, and P Canals, respectively (P > .05) when assessed at high resolution. Conclusions: By using SAF instruments in vitro, Canals in maxillary molars were homogenously and circumferentially prepared with little canal transportation. (J Endod 2011;37:53‐57)
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preparation of oval shaped root Canals in mandibular molars using nickel titanium rotary instruments a micro computed tomography study
Journal of Endodontics, 2010Co-Authors: Frank Paque, Thomas Attin, Marc Balmer, Ove A PetersAbstract:Abstract Introduction This study evaluated the prepared surface areas of oval-shaped Canals in distal roots of mandibular molars using four different instrumentation techniques. Methods Teeth were prescanned and reconstructed using micro–computed tomography (MCT) scans at low resolution (68 μm). Forty-eight molars with ribbon-shaped/oval distal root Canals were selected and randomly assigned to four groups. Distal Canals (n = 12 each) were prepared by circumferential filing using Hedstrom files to apical size #40 (group H/CF); with ProTaper nickel-titanium rotaries to finishing file 4 (F4) considering the distal canal as 1 canal (group PT/1); ProTaper to F4 considering buccal and oral aspects of the distal canal as 2 individual Canals (group PT/2); ProTaper to F4 in a circumferential filing motion (PT/CF). Before and after shaping, teeth were evaluated using MCT at 34-μm resolution. The percentage of prepared surface was assessed for the full canal length and the apical 4 mm. Statistical analysis was performed using analysis of variance and Bonferroni/Dunn multiple comparisons. Results Preoperatively, canal anatomy was statistically similar among the groups (p = 0.56). Mean (± standard deviation) untreated areas ranged from 59.6% (±14.9, group PT/2) to 79.9% (±10.3, PT/1) for the total canal length and 65.2% to 74.7% for the apical canal portion, respectively. Canals in group PT/1 had greater untreated surface areas (p Conclusions Preparations of oval-shaped root Canals in mandibular molars left a variable portion of surface area unprepared regardless of the instrumentation technique used. However, considering oval Canals as two separate entities during preparation appeared to be beneficial in increasing overall prepared surface.
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root canal preparation with endo eze aet changes in root canal shape assessed by micro computed tomography
International Endodontic Journal, 2005Co-Authors: Frank Paque, Fred Barbakow, Ove A PetersAbstract:PaqueF, Barbakow F, Peters OA. Root canal preparation with Endo-Eze AET: changes in root canal shape assessed by micro-computed tomography. International Endodontic Journal, 38, 456-464, 2005. Aim To evaluate the relative performance of Endo-Eze Anatomic Endodontic Technology (AET) stainless steel instruments when shaping maxillary molar root Canals in vitro. Methodology Extracted human maxillary molars were scanned, before and after root canal shaping with Endo-Eze AET, employing micro-computed tomography (lCT) at an isotropic resolution of 34 lm. Three- dimensional root canal models were reconstructed and evaluated for volume, surface area, 'thickness' (diam- eter), canal transportation and prepared surface. Pre- paration errors such as apical zips, perforations and fractured instruments were visually determined from those models. Means were contrasted using anova and Scheffepost-hoc tests. Results Volume and surface area increased signifi- cantly and similarly in mesiobuccal (mb), distobuccal (db) and palatal (p) Canals and gross preparation errors (n ¼ 17) were found. Mean root canal diam- eters, 5 mm coronal to the apex, increased from 0.31 to 0.52, 0.35 to 0.50 and 0.50 to 0.70 mm for mb, db and p Canals, respectively. Mean canal transpor- tation ranged from 0.15 to 0.29, 0.15 to 0.27 and 0.21 to 0.33 mm for apical, middle and coronal root canal levels, respectively, with highest values found for mb Canals (P < 0.003). Root Canals were significantly straightened during preparation (P < 0.002). Conclusions In summary, Endo-Eze AET instru- ments shaped root Canals in maxillary molars with substantial canal transportation, particularly in mesio- buccal root Canals. Preparation with this instrument removed high volumes of dentine, even though apical preparation was size 30. Based on the current results, Endo-Eze AET cannot be recommended for the prepar- ation of teeth with curved root Canals.
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root canal preparation with flexmaster canal shapes analysed by micro computed tomography
International Endodontic Journal, 2003Co-Authors: W Hubscher, Fred Barbakow, Ove A PetersAbstract:Aim To evaluate the relative performance of FlexMaster nickel-titanium instruments shaping maxillary molar root Canals in vitro. Methodology Extracted human maxillary molars were scanned, before and after root-canal shaping, with FlexMaster, employing micro-computed tomography (muCT) at a resolution of 36 mum. Canals were three-dimensionally reconstructed and evaluated for volume, surface area, 'thickness' (diameter), canal transportation and prepared surface. Based on median canal volume, the Canals were divided into 'wide' and 'constricted' groups. Comparisons were made between mesiobuccal (mb), distobuccal (db) and palatal (p), as well as 'wide' and 'constricted' Canals, using ANOVA and Scheffe post-hoc tests. Results Volume and surface area increased significantly and similarly in mb, db and p Canals, and no gross preparation errors were found. Mean root-canal diameters, 5 mm coronal to the apex, increased from 0.45 to 0.65 mm, from 0.41 to 0.56 mm and from 0.79 to 0.85 mm for mb, db and p Canals, respectively. Apical canal transportation ranged from 0.01 to 0.29 mm and was independent of canal type; 'wide' Canals had a significantly higher (P < 0.05) proportion of unprepared surfaces than 'constricted' Canals had. Conclusions FlexMaster instruments shaped curved and narrow root Canals in maxillary molars to sizes 40 and 45 without significant shaping errors. Canal anatomy had an insignificant impact on preparation, indicating that FlexMaster instruments were able to shape 'constricted' Canals as well as 'wide' ones.
Frank Paque - One of the best experts on this subject based on the ideXlab platform.
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micro computed tomography evaluation of the preparation of long oval root Canals in mandibular molars with the self adjusting file
Journal of Endodontics, 2011Co-Authors: Frank Paque, Ove A PetersAbstract:Abstract Introduction The aim of this study was to assess the shaping potential of a novel nickel-titanium instrument, the self-adjusting file (SAF), in long oval root Canals in distal roots in mandibular molars. Methods Twenty mandibular molars with long oval distal root Canals were selected and scanned preoperatively and postoperatively by using micro–computed tomography at an original resolution of 20 μm. Canals were shaped with the SAF, three-dimensionally reconstructed, and evaluated for volume, surface area, canal transportation, and prepared surface. Data were statistically contrasted by using paired t tests and regression analysis. Results Preoperatively, canal volume was 7.73 ± 2.13 mm 3 , and canal area was 42.83 ± 8.14 mm 2 . Volumes and surface areas increased significantly ( P 3 and 3.34 ± 1.73 mm 2 , respectively, and no gross preparation errors were detected. Unprepared canal surface varied between individual Canals, and mean unprepared surface was 23.5% ± 8.9%. Prepared areas were significantly larger compared with rotary canal preparation done in a previous study. Canal transportation scores were higher in the coronal root canal third (106 ± 50 μm) compared with the apical third (81 ± 49 μm). Conclusions In vitro , preparation of long oval-shaped root Canals in mandibular molars with the SAF was effective and safe. Moreover, shapes generated with the SAF were more complete compared with rotary canal preparation.
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root canal preparation of maxillary molars with the self adjusting file a micro computed tomography study
Journal of Endodontics, 2011Co-Authors: Ove A Peters, Frank PaqueAbstract:Introduction: The aim of this study was to describe the canal shaping properties of a novel nickel-titanium instrument, the self-adjusting file (SAF), in maxillary molars. Methods: Twenty maxillary molars were scanned by using micro‐computed tomography at 20mm resolution. Canals were shaped with the SAF, which was operated with continuous irrigation in a handpiece that provided an in-and-out vibrating movement. Changes in canal volumes, surface areas, and crosssectional geometry were compared with preoperative values. Canal transportation and the fraction of unprepared canal surface area were also determined. Data were normally distributed and compared by analyses of variance. Results: Preoperatively, mean canal volumes were 2.88 1.32, 1.50 0.99, and 4.30 1.89 mm 3 for mesiobuccal (MB), distobuccal (DB), and palatal (P) Canals, respectively; these values were statistically similar to earlier studies with the same protocol. Volumes and surface areas increased significantly in MB, DB, and P Canals; mean canal transportation scores in the apical and middle root canal thirds ranged between 31 and 89 mm. Mean unprepared surfaces were 25.8% 12.4%, 22.1% 12.0%, and 25.2% 11.3% in MB, DB, and P Canals, respectively (P > .05) when assessed at high resolution. Conclusions: By using SAF instruments in vitro, Canals in maxillary molars were homogenously and circumferentially prepared with little canal transportation. (J Endod 2011;37:53‐57)
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preparation of oval shaped root Canals in mandibular molars using nickel titanium rotary instruments a micro computed tomography study
Journal of Endodontics, 2010Co-Authors: Frank Paque, Thomas Attin, Marc Balmer, Ove A PetersAbstract:Abstract Introduction This study evaluated the prepared surface areas of oval-shaped Canals in distal roots of mandibular molars using four different instrumentation techniques. Methods Teeth were prescanned and reconstructed using micro–computed tomography (MCT) scans at low resolution (68 μm). Forty-eight molars with ribbon-shaped/oval distal root Canals were selected and randomly assigned to four groups. Distal Canals (n = 12 each) were prepared by circumferential filing using Hedstrom files to apical size #40 (group H/CF); with ProTaper nickel-titanium rotaries to finishing file 4 (F4) considering the distal canal as 1 canal (group PT/1); ProTaper to F4 considering buccal and oral aspects of the distal canal as 2 individual Canals (group PT/2); ProTaper to F4 in a circumferential filing motion (PT/CF). Before and after shaping, teeth were evaluated using MCT at 34-μm resolution. The percentage of prepared surface was assessed for the full canal length and the apical 4 mm. Statistical analysis was performed using analysis of variance and Bonferroni/Dunn multiple comparisons. Results Preoperatively, canal anatomy was statistically similar among the groups (p = 0.56). Mean (± standard deviation) untreated areas ranged from 59.6% (±14.9, group PT/2) to 79.9% (±10.3, PT/1) for the total canal length and 65.2% to 74.7% for the apical canal portion, respectively. Canals in group PT/1 had greater untreated surface areas (p Conclusions Preparations of oval-shaped root Canals in mandibular molars left a variable portion of surface area unprepared regardless of the instrumentation technique used. However, considering oval Canals as two separate entities during preparation appeared to be beneficial in increasing overall prepared surface.
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root canal preparation with endo eze aet changes in root canal shape assessed by micro computed tomography
International Endodontic Journal, 2005Co-Authors: Frank Paque, Fred Barbakow, Ove A PetersAbstract:PaqueF, Barbakow F, Peters OA. Root canal preparation with Endo-Eze AET: changes in root canal shape assessed by micro-computed tomography. International Endodontic Journal, 38, 456-464, 2005. Aim To evaluate the relative performance of Endo-Eze Anatomic Endodontic Technology (AET) stainless steel instruments when shaping maxillary molar root Canals in vitro. Methodology Extracted human maxillary molars were scanned, before and after root canal shaping with Endo-Eze AET, employing micro-computed tomography (lCT) at an isotropic resolution of 34 lm. Three- dimensional root canal models were reconstructed and evaluated for volume, surface area, 'thickness' (diam- eter), canal transportation and prepared surface. Pre- paration errors such as apical zips, perforations and fractured instruments were visually determined from those models. Means were contrasted using anova and Scheffepost-hoc tests. Results Volume and surface area increased signifi- cantly and similarly in mesiobuccal (mb), distobuccal (db) and palatal (p) Canals and gross preparation errors (n ¼ 17) were found. Mean root canal diam- eters, 5 mm coronal to the apex, increased from 0.31 to 0.52, 0.35 to 0.50 and 0.50 to 0.70 mm for mb, db and p Canals, respectively. Mean canal transpor- tation ranged from 0.15 to 0.29, 0.15 to 0.27 and 0.21 to 0.33 mm for apical, middle and coronal root canal levels, respectively, with highest values found for mb Canals (P < 0.003). Root Canals were significantly straightened during preparation (P < 0.002). Conclusions In summary, Endo-Eze AET instru- ments shaped root Canals in maxillary molars with substantial canal transportation, particularly in mesio- buccal root Canals. Preparation with this instrument removed high volumes of dentine, even though apical preparation was size 30. Based on the current results, Endo-Eze AET cannot be recommended for the prepar- ation of teeth with curved root Canals.
Yan Wang - One of the best experts on this subject based on the ideXlab platform.
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Use of Cone-beam Computed Tomography to Evaluate Root Canal Morphology and Locate Root Canal Orifices of Maxillary Second Premolars in a Chinese Subpopulation
Journal of endodontics, 2014Co-Authors: Lin Yang, Cheng Tian, Xinyu Chen, Ting Han, Yan WangAbstract:The aim of this study was to investigate root canal morphology and locate root canal orifices of maxillary second premolars in a Chinese subpopulation using cone-beam computed tomographic imaging. A total of 392 cone-beam computed tomographic images of maxillary second premolars were obtained from 238 patients who required a preoperative assessment for implant surgery or orthodontic treatment. The number of roots and root Canals and root canal configuration were investigated and categorized using Vertucci's criteria. The distance between the root canal orifice and the anatomic apex and the distance between root canal orifices in those teeth with 2 root Canals were measured and evaluated. The Fisher exact test was used to analyze the correlation between the number of roots and sex. Among the 392 teeth, 86.5% (n = 339) had 1 root; 45.4% (n = 178) of the teeth had 1 root canal, and 54.3% (n = 213) had 2 root Canals that ranged from type II-type V. The majority of teeth with 2 root Canals showed a type IV canal configuration (n = 79, 20.2%) followed by type II (n = 64, 16.3%), type III (n = 45, 11.4%), and type V (n = 25, 6.4%). Only 1 tooth had 3 root Canals. No significant difference was found between the number of roots and sex (P > .05). Among the 213 teeth with 2 root Canals, the most frequent distribution of the distance between the root canal orifice and the anatomic apex was 5-10 mm (n = 157). The distance between the 2 orifices of 189 teeth was 1-4 mm. The frequency of teeth with 2 root Canals was high in maxillary second premolars. The internal morphology of teeth with 2 root Canals was variable. This study provided useful information about the root canal morphology of maxillary second premolars in a Chinese subpopulation. Copyright © 2014 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
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a cone beam computed tomography study of the root canal morphology of mandibular first premolars and the location of root canal orifices and apical foramina in a chinese subpopulation
Journal of Endodontics, 2013Co-Authors: Haibing Yang, Cheng Tian, Guoju Li, Lin Yang, Yan WangAbstract:Abstract Introduction Successful root canal treatment is dependent on detailed knowledge of the morphology of the root canal system. The aim of this study was to investigate the morphology of the root canal systems of mandibular first premolars and the location of root canal orifices and apical foramina in a Chinese subpopulation using cone-beam computed tomography scanning. Methods A total of 440 cone-beam computed tomographic images of mandibular first premolars were obtained from 238 patients. Tooth position, root canal morphology, the distance between the apical foramen and the anatomic apex, and the distance between the 2 root canal orifices of mandibular first premolars with 2 root Canals were investigated. The Fisher exact test was used to analyze the correlation between the number of root Canals and tooth position. Results Overall, 1.14% ( n = 5) of the teeth had a C-shaped root canal system, 77.14% ( n = 335) had 1 root canal, and 22.05% ( n = 97) had 2 root Canals from type II to type V. The remaining 0.68% ( n = 3) were classified as type VIII, which had 3 root Canals. The most frequent distribution of the distance between the apical foramen and the anatomic apex in 335 mandibular first premolars with 1 root canal was 1–2 mm ( n = 192). The distance between the apical foramen and the anatomic apex of mandibular first premolars with 2 root Canals was in accord with that of mandibular first premolars with 1 root canal. The distance between the 2 root canal orifices of mandibular first premolars with 2 root Canals was approximately 13 mm. Conclusions Most mandibular first premolars had 1 root canal. More than 1 of 5 mandibular first premolars had complex root canal systems (with 2 or more root Canals). This study provides supplemental information about the root Canals of mandibular first premolars in a Chinese subpopulation.
Andres Laib - One of the best experts on this subject based on the ideXlab platform.
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effects of four ni ti preparation techniques on root canal geometry assessed by micro computed tomography
International Endodontic Journal, 2001Co-Authors: Ove A Peters, K Schonenberge, Andres LaibAbstract:Peters OA, Schonenberger K, Laib A. Effects of four Ni‐Ti preparation techniques on root canal geometry assessed by micro computed tomography. International Endodontic Journal , 34 , 221‐230, 2001. Aim The aim of this study was to compare the effects of four preparation techniques on canal volume and surface area using three-dimensionally reconstructed root Canals in extracted human maxillary molars. In addition, μ CT data was used to describe morphometric parameters related to the four preparation techniques. Methodology A micro computed tomography scanner was used to analyse root Canals in extracted maxillary molars. Specimens were scanned before and after Canals were prepared using Ni‐Ti ‐ K-Files, Lightspeed instruments, ProFile .04 and GT rotary instruments. Differences in dentine volume removed, canal straightening, the proportion of unchanged area and canal transportation were calculated using specially developed software. Results Instrumentation of Canals increased volume and surface area. Prepared Canals were significantly more rounded, had greater diameters and were straighter than unprepared Canals. However, all instrumentation techniques left 35% or more of the Canals’ surface area unchanged. Whilst there were significant differences between the three canal types investigated, very few differences were found with respect to instrument types. Conclusions Within the limitations of the μ CT system, there were few differences between the four canal instrumentation techniques used. By contrast, a strong impact of variations of canal anatomy was demonstrated. Further studies with 3D-techniques are required to fully understand the biomechanical aspects of root canal preparation.
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effects of four ni ti preparation techniques on root canal geometry assessed by micro computed tomography
International Endodontic Journal, 2001Co-Authors: Ove A Peters, K Schonenberger, Andres LaibAbstract:Peters OA, Schonenberger K, Laib A. Effects of four Ni‐Ti preparation techniques on root canal geometry assessed by micro computed tomography. International Endodontic Journal , 34 , 221‐230, 2001. Aim The aim of this study was to compare the effects of four preparation techniques on canal volume and surface area using three-dimensionally reconstructed root Canals in extracted human maxillary molars. In addition, μ CT data was used to describe morphometric parameters related to the four preparation techniques. Methodology A micro computed tomography scanner was used to analyse root Canals in extracted maxillary molars. Specimens were scanned before and after Canals were prepared using Ni‐Ti ‐ K-Files, Lightspeed instruments, ProFile .04 and GT rotary instruments. Differences in dentine volume removed, canal straightening, the proportion of unchanged area and canal transportation were calculated using specially developed software. Results Instrumentation of Canals increased volume and surface area. Prepared Canals were significantly more rounded, had greater diameters and were straighter than unprepared Canals. However, all instrumentation techniques left 35% or more of the Canals’ surface area unchanged. Whilst there were significant differences between the three canal types investigated, very few differences were found with respect to instrument types. Conclusions Within the limitations of the μ CT system, there were few differences between the four canal instrumentation techniques used. By contrast, a strong impact of variations of canal anatomy was demonstrated. Further studies with 3D-techniques are required to fully understand the biomechanical aspects of root canal preparation.
Haibing Yang - One of the best experts on this subject based on the ideXlab platform.
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a cone beam computed tomography study of the root canal morphology of mandibular first premolars and the location of root canal orifices and apical foramina in a chinese subpopulation
Journal of Endodontics, 2013Co-Authors: Haibing Yang, Cheng Tian, Guoju Li, Lin Yang, Yan WangAbstract:Abstract Introduction Successful root canal treatment is dependent on detailed knowledge of the morphology of the root canal system. The aim of this study was to investigate the morphology of the root canal systems of mandibular first premolars and the location of root canal orifices and apical foramina in a Chinese subpopulation using cone-beam computed tomography scanning. Methods A total of 440 cone-beam computed tomographic images of mandibular first premolars were obtained from 238 patients. Tooth position, root canal morphology, the distance between the apical foramen and the anatomic apex, and the distance between the 2 root canal orifices of mandibular first premolars with 2 root Canals were investigated. The Fisher exact test was used to analyze the correlation between the number of root Canals and tooth position. Results Overall, 1.14% ( n = 5) of the teeth had a C-shaped root canal system, 77.14% ( n = 335) had 1 root canal, and 22.05% ( n = 97) had 2 root Canals from type II to type V. The remaining 0.68% ( n = 3) were classified as type VIII, which had 3 root Canals. The most frequent distribution of the distance between the apical foramen and the anatomic apex in 335 mandibular first premolars with 1 root canal was 1–2 mm ( n = 192). The distance between the apical foramen and the anatomic apex of mandibular first premolars with 2 root Canals was in accord with that of mandibular first premolars with 1 root canal. The distance between the 2 root canal orifices of mandibular first premolars with 2 root Canals was approximately 13 mm. Conclusions Most mandibular first premolars had 1 root canal. More than 1 of 5 mandibular first premolars had complex root canal systems (with 2 or more root Canals). This study provides supplemental information about the root Canals of mandibular first premolars in a Chinese subpopulation.
