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Cecilia C.s. Dong - One of the best experts on this subject based on the ideXlab platform.
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anomalous Mandibular Premolars a Mandibular First Premolar with three roots and a Mandibular second Premolar with a c shaped canal system
International Endodontic Journal, 2008Co-Authors: Blaine M Cleghorn, W. H. Christie, Cecilia C.s. DongAbstract:Cleghorn BM, Christie WH, Dong CCS. Anomalous Mandibular Premolars: a Mandibular First Premolar with three roots and a Mandibular second Premolar with a C-shaped canal system. International Endodontic Journal, 41, 1005‐1014, 2008. Aim To describe unusual variations in the root morphology and root canal systems of Mandibular First and second Premolar teeth extracted for orthodontic reasons. Summary Normally Mandibular First and second Premolar teeth have single roots with single canals. A 15-year-old patient presented for orthodontic treatment and two Mandibular Premolar teeth were examined post-extraction. The Mandibular First Premolar exhibited three distinct, separate roots and the Mandibular second Premolar exhibited a C-shaped root canal system. The coronal morphology of each of the MandibularPremolarsrevealeddimensionsandanatomywithinnormallimits.Theincidence of a three-rooted Mandibular First Premolar is approximately 0.2%. Key learning points • Thorough clinical and radiographic interpretation is important in recognizing anomalous root and root canal systems. • The most common forms of root and canal systems and its aberrations must be understood to realize variations from normal do occur. • Successful root canal treatment requires an accurate diagnosis of the root canal system using all available aids. • Value of microcomputed tomography in the study of anatomy ex vivo and cone-beam tomography in clinical endodontics of complex Premolar cases is increasing.
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the root and root canal morphology of the human Mandibular second Premolar a literature review
Journal of Endodontics, 2007Co-Authors: Laine Clegho, William H Christie, Cecilia C.s. DongAbstract:The objective was to review thoroughly the literature of the root and root canal morphology of the human Mandibular second Premolar and compare the results with the Mandibular First Premolar. Published studies cite the anatomy and morphology of the Mandibular second Premolar tooth for more than 7700 teeth. These studies were divided into anatomic studies reporting the number of roots, number of canals, and apical anatomy. Differences caused by gender and ethnicity have also been reported. Individual case reports of anomalies were included to demonstrate the extreme range of variation. Almost all of the teeth in the anatomic studies were single-rooted (99.6%). The incidence of 2 roots (0.3%) and 3 roots (0.1%) was extremely rare. Anatomic studies of the internal canal morphology found that a single canal was present in 91.0% of the teeth. A single apical foramen was found in 91.8% of the teeth. The incidence of more than 1 root (0.4%), more than 1 canal system (9.9%), and more than 1 foramen (8.2%) is lower than that of the Mandibular First Premolar tooth (2.0%, 24.2%, and 21.1%, respectively). However, the root and root canal morphology of the Mandibular second Premolar can be extremely complex and requires careful assessment.
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The root and root canal morphology of the human Mandibular First Premolar: a literature review.
Journal of endodontics, 2007Co-Authors: Blaine M Cleghorn, William H Christie, Cecilia C.s. DongAbstract:The purpose of this study was to undertake a comprehensive literature review of the root and root canal morphology of the Mandibular First Premolar. Published studies citing the anatomy and morphology of Mandibular Premolars report data for over 6,700 teeth. These studies were divided into anatomical studies reporting number of roots, number of canals, and apical morphology. Variations because of sex and ethnic background have also been reported, along with case reports of anomalies. Approximately 98% of the teeth in these studies were single-rooted. The incidence of two roots was 1.8%. Three roots when reported were found in 0.2% of the teeth studied. Four roots were rare and were found in less than 0.1% of the teeth studied. Studies of the internal canal morphology revealed that a single canal was present in 75.8% of the teeth. Two or more canals were found in 24.2% of the teeth studied. A single apical foramen was found in 78.9% of the teeth, whereas 21.1% had two or more apical foramina. The role of genetics and racial variation may result in differences of incidence of root number and canal number in human populations. The dental literature is not unique in studying ethnicity and sex variations. Higher incidences of teeth with additional canals and roots have been reported in Chinese, Australian, and sub-Sahara African populations. Physical anthropology studies seem to show the lowest incidence in Western Eurasian, Japanese and American Arctic populations. The root and root canal morphology of this tooth can be complex and requires careful evaluation prior to root canal therapy.
Manjing Deng - One of the best experts on this subject based on the ideXlab platform.
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a micro computed tomography study of the root canal morphology of the Mandibular First Premolar in a population from southwestern china
Clinical Oral Investigations, 2013Co-Authors: Xiangjie Li, Jianping An, Lijun Ye, Manjing DengAbstract:Objectives This study aimed to investigate the root canal morphology of Mandibular First Premolar teeth in a population from southwestern China by micro-computed tomography (micro-CT).
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a micro computed tomography study of the location and curvature of the lingual canal in the Mandibular First Premolar with two canals originating from a single canal
Journal of Endodontics, 2012Co-Authors: Xiangjie Li, Lijun Ye, Xia Zhou, Manjing DengAbstract:Abstract Introduction Little is known about the lingual canal in the Vertucci type V Mandibular First Premolar. This study investigated the location of the lingual canal orifice and the curvature of the lingual canal by using micro–computed tomography. Methods One hundred fifteen Mandibular First Premolars were scanned by micro–computed tomography, reconstructed 3-dimensionally by using Mimics 10.01 software, and displayed in parallel projection mode. Twenty-six teeth with Vertucci type V canal were selected for further study. The lingual canal orifice was located by measurements made in both lingual and proximal views. The angle alpha (α) between the start of the lingual canal and the main canal and the angle beta (β) of the curvature of lingual canal were also measured. Results In proximal view, 69% of lingual canals were located in the middle third of the tooth and the remainder in the apical third. In lingual view, 73% were located in the middle third of the root and the remainder in the coronal third. Mean angle α and angle β were 33.54° and 26.66°, respectively, in proximal view and 8.31° and 11.31°, respectively, in lingual view ( P Conclusions Detailed information on the lingual canal is essential for successful endodontic treatment in patients with Mandibular First Premolar. The view used for imaging influences the information obtained.
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A Micro–Computed Tomography Study of the Location and Curvature of the Lingual Canal in the Mandibular First Premolar with Two Canals Originating from a Single Canal
Journal of endodontics, 2012Co-Authors: Na Liu, Xia Zhou, Ning Liu, Xing Nie, Xiujie Wen, Rui Liu, Luchuan Liu, Manjing DengAbstract:Abstract Introduction Little is known about the lingual canal in the Vertucci type V Mandibular First Premolar. This study investigated the location of the lingual canal orifice and the curvature of the lingual canal by using micro–computed tomography. Methods One hundred fifteen Mandibular First Premolars were scanned by micro–computed tomography, reconstructed 3-dimensionally by using Mimics 10.01 software, and displayed in parallel projection mode. Twenty-six teeth with Vertucci type V canal were selected for further study. The lingual canal orifice was located by measurements made in both lingual and proximal views. The angle alpha (α) between the start of the lingual canal and the main canal and the angle beta (β) of the curvature of lingual canal were also measured. Results In proximal view, 69% of lingual canals were located in the middle third of the tooth and the remainder in the apical third. In lingual view, 73% were located in the middle third of the root and the remainder in the coronal third. Mean angle α and angle β were 33.54° and 26.66°, respectively, in proximal view and 8.31° and 11.31°, respectively, in lingual view ( P Conclusions Detailed information on the lingual canal is essential for successful endodontic treatment in patients with Mandibular First Premolar. The view used for imaging influences the information obtained.
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Comparative study of root canal morphology of Mandibular First Premolar by micro-CT and radio visio graphy
Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology, 2012Co-Authors: Na Liu, Rui Liu, Luchuan Liu, Zhengmou Dong, Manjing DengAbstract:OBJECTIVE To compare the consistency of root canal configuration types of Mandibular First Premolar by using micro-CT and radio visio graphy (RVG). METHODS One hundred extracted Mandibular First Premolars with complete dental root and apex which received no endodontic treatment were randomly selected. Each tooth was radiographed with RVG through a buccolingual and mesiodistal direction, and then scanned with micro-CT and reconstructed. The classifications of the root canal types according to Vertucci's type with the two methods were compared. RESULTS The canal patterns were classified as type I (67%), type III (3%), type V (18%), type VII (2%), additional type (10%) with micro-CT and canal patterns as type I (71%), type III (2%), type V (23%), type VII (1%), additional type (3%) with RVG. 63% of teeth showed one canal in both micro-CT and RVG. Only 25% of teeth were diagnosed as complex canal by the same canal type in both micro-CT and RVG. The Kappa value between micro-CT and RVG was 0.541 which suggested that the two kinds of methods had intermediate consistency. 82.8% of the Premolars with root groove had two or more than two canals. CONCLUSION Although RVG can basically reflect the root canal system type of the Mandibular First Premolars in vitro, it offers poor accuracy images to complex root canals. Micro-CT three-dimensional images could clearly and precisely display the root canal system morphology of the Mandibular First pre-molars in vitro.
Blaine M Cleghorn - One of the best experts on this subject based on the ideXlab platform.
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anomalous Mandibular Premolars a Mandibular First Premolar with three roots and a Mandibular second Premolar with a c shaped canal system
International Endodontic Journal, 2008Co-Authors: Blaine M Cleghorn, W. H. Christie, Cecilia C.s. DongAbstract:Cleghorn BM, Christie WH, Dong CCS. Anomalous Mandibular Premolars: a Mandibular First Premolar with three roots and a Mandibular second Premolar with a C-shaped canal system. International Endodontic Journal, 41, 1005‐1014, 2008. Aim To describe unusual variations in the root morphology and root canal systems of Mandibular First and second Premolar teeth extracted for orthodontic reasons. Summary Normally Mandibular First and second Premolar teeth have single roots with single canals. A 15-year-old patient presented for orthodontic treatment and two Mandibular Premolar teeth were examined post-extraction. The Mandibular First Premolar exhibited three distinct, separate roots and the Mandibular second Premolar exhibited a C-shaped root canal system. The coronal morphology of each of the MandibularPremolarsrevealeddimensionsandanatomywithinnormallimits.Theincidence of a three-rooted Mandibular First Premolar is approximately 0.2%. Key learning points • Thorough clinical and radiographic interpretation is important in recognizing anomalous root and root canal systems. • The most common forms of root and canal systems and its aberrations must be understood to realize variations from normal do occur. • Successful root canal treatment requires an accurate diagnosis of the root canal system using all available aids. • Value of microcomputed tomography in the study of anatomy ex vivo and cone-beam tomography in clinical endodontics of complex Premolar cases is increasing.
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The root and root canal morphology of the human Mandibular First Premolar: a literature review.
Journal of endodontics, 2007Co-Authors: Blaine M Cleghorn, William H Christie, Cecilia C.s. DongAbstract:The purpose of this study was to undertake a comprehensive literature review of the root and root canal morphology of the Mandibular First Premolar. Published studies citing the anatomy and morphology of Mandibular Premolars report data for over 6,700 teeth. These studies were divided into anatomical studies reporting number of roots, number of canals, and apical morphology. Variations because of sex and ethnic background have also been reported, along with case reports of anomalies. Approximately 98% of the teeth in these studies were single-rooted. The incidence of two roots was 1.8%. Three roots when reported were found in 0.2% of the teeth studied. Four roots were rare and were found in less than 0.1% of the teeth studied. Studies of the internal canal morphology revealed that a single canal was present in 75.8% of the teeth. Two or more canals were found in 24.2% of the teeth studied. A single apical foramen was found in 78.9% of the teeth, whereas 21.1% had two or more apical foramina. The role of genetics and racial variation may result in differences of incidence of root number and canal number in human populations. The dental literature is not unique in studying ethnicity and sex variations. Higher incidences of teeth with additional canals and roots have been reported in Chinese, Australian, and sub-Sahara African populations. Physical anthropology studies seem to show the lowest incidence in Western Eurasian, Japanese and American Arctic populations. The root and root canal morphology of this tooth can be complex and requires careful evaluation prior to root canal therapy.
R. Sandhya - One of the best experts on this subject based on the ideXlab platform.
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Assessment of root canal morphology of Mandibular First Premolars in the Indian population using spiral computed tomography: an in vitro study.
Indian journal of dental research : official publication of Indian Society for Dental Research, 2010Co-Authors: R. Sandhya, N. Velmurugan, Deivanayagam KandaswamyAbstract:Aim: The aim of the study is to determine the root canal morphology of the Mandibular First Premolar teeth in an Indian population using spiral computed tomography (SCT). Materials and Methods: One hundred extracted Mandibular First Premolars were observed using Spiral Computed Tomography for the (i) Pattern of root canal (ii) Tooth length (iii) Position of the bifurcation of the canal (iv) Invagination of the root (v) Root thickness. The root canal morphology was classified based on Vertucci's classification. Results: Eighty percent of the teeth had a single canal, 11% of the teeth had two canals, and C-shaped canals were found in 2% of the teeth, in this study. The average length of the teeth was 21.6 mm. Fourteen percent of the teeth had mesial invagination of the root. Conclusion: The Type I root canal morphology was the most common type of root canal system in the Mandibular First Premolars among the Indian population in this study.
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Root canal morphology of Mandibular First Premolars in an Indian population: a laboratory study
International endodontic journal, 2009Co-Authors: N. Velmurugan, R. SandhyaAbstract:Aim To determine the root canal morphology of Mandibular First Premolar teeth in an Indian population using a decalcification and clearing technique. Methodology One hundred extracted adult Mandibular First Premolar teeth were studied following decalcification and clearing. The shape of the canal orifice, root canal pattern and length of the teeth were determined. Results The Mandibular First Premolars were identified to have a round orifice (38%), oval orifice (44%), flattened orifice (17%) and C-shaped orifice (1%). The canal patterns were classified as Type I (72%), Type II (6%), Type III (3%), Type IV (10%) and Type V (8%) according to Vertucci’s classification. C-shaped canals were identified in one tooth (1%). The average length of the teeth was 21.6 mm. Fourteen per cent of the teeth had mesial invaginations of the root. Conclusions Type I canal patterns were the most frequently occurring in Mandibular First Premolars amongst the Indian population. 85.7% of the teeth with mesial invagination of the root had either two canals or division of canals.
Xiangjie Li - One of the best experts on this subject based on the ideXlab platform.
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a micro computed tomography study of the root canal morphology of the Mandibular First Premolar in a population from southwestern china
Clinical Oral Investigations, 2013Co-Authors: Xiangjie Li, Jianping An, Lijun Ye, Manjing DengAbstract:Objectives This study aimed to investigate the root canal morphology of Mandibular First Premolar teeth in a population from southwestern China by micro-computed tomography (micro-CT).
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a micro computed tomography study of the location and curvature of the lingual canal in the Mandibular First Premolar with two canals originating from a single canal
Journal of Endodontics, 2012Co-Authors: Xiangjie Li, Lijun Ye, Xia Zhou, Manjing DengAbstract:Abstract Introduction Little is known about the lingual canal in the Vertucci type V Mandibular First Premolar. This study investigated the location of the lingual canal orifice and the curvature of the lingual canal by using micro–computed tomography. Methods One hundred fifteen Mandibular First Premolars were scanned by micro–computed tomography, reconstructed 3-dimensionally by using Mimics 10.01 software, and displayed in parallel projection mode. Twenty-six teeth with Vertucci type V canal were selected for further study. The lingual canal orifice was located by measurements made in both lingual and proximal views. The angle alpha (α) between the start of the lingual canal and the main canal and the angle beta (β) of the curvature of lingual canal were also measured. Results In proximal view, 69% of lingual canals were located in the middle third of the tooth and the remainder in the apical third. In lingual view, 73% were located in the middle third of the root and the remainder in the coronal third. Mean angle α and angle β were 33.54° and 26.66°, respectively, in proximal view and 8.31° and 11.31°, respectively, in lingual view ( P Conclusions Detailed information on the lingual canal is essential for successful endodontic treatment in patients with Mandibular First Premolar. The view used for imaging influences the information obtained.