The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform
Gang Chen - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of optimal range of rotational moment for the Mandibular Lateral Incisor canine and first premolar based on biomechanical responses of periodontal ligaments a case study
Clinical Oral Investigations, 2021Co-Authors: Yunfeng Liu, Dongcai Wang, Xingtao Dong, Qianli Sun, Gang ChenAbstract:The objective of this study was to investigate the optimal range of rotational moment for the Mandibular Lateral Incisor, canine and first premolar to determine tooth movements during orthodontic treatment using hydrostatic stress and logarithmic strain on the periodontal ligament (PDL) as indicators by numerical simulations. Teeth, PDL and alveolar bone numerical models were constructed as analytical objects based on computed tomography (CT) images. Teeth were assumed to be rigid bodies, and rotational moments ranging from 1.0 to 4.0 Nmm were exerted on the crowns. PDL was defined as a hyperelastic–viscoelastic material with a uniform thickness of 0.25 mm. The alveolar bone model was constructed using a non-uniform material with varied mechanical properties determined based on Hounsfield unit (HU) values calculated using CT images, and its bottom was fixed completely. The optimal range values of PDL compressive and tensile stress were set as 0.47–12.8 and 18.8–51.2 kPa, respectively, whereas that of PDL logarithmic strain was set as 0.15–0.3%. The rotational tendency of PDL was around the long axis of teeth when loaded. The optimal range values of rotational moment for the Mandibular Lateral Incisor, canine and first premolar were 2.2–2.3, 3.0–3.1 and 2.8–2.9 Nmm, respectively, referring to the biomechanical responses of loaded PDL. Primarily, the optimal range of rotational moment was quadratically dependent on the area of PDL internal surface (i.e. area of PDL internal surface was used to indicate PDL size), as described by the fitting formula. Biomechanical responses of PDL can be used to estimate the optimal range of rotational moment for teeth. These rotational moments were not consistent for all teeth, as demonstrated by numerical simulations. The quantitative relationship between the area of PDL internal surface and the optimal orthodontic moment can help orthodontists to determine a more reasonable moment and further optimise clinical treatment.
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numerical simulation of optimal range of rotational moment for the Mandibular Lateral Incisor canine and first premolar based on biomechanical responses of periodontal ligaments a case study
Clinical Oral Investigations, 2020Co-Authors: Yunfeng Liu, Dongcai Wang, Xingtao Dong, Qianli Sun, Gang ChenAbstract:OBJECTIVES The objective of this study was to investigate the optimal range of rotational moment for the Mandibular Lateral Incisor, canine and first premolar to determine tooth movements during orthodontic treatment using hydrostatic stress and logarithmic strain on the periodontal ligament (PDL) as indicators by numerical simulations. MATERIAL AND METHODS Teeth, PDL and alveolar bone numerical models were constructed as analytical objects based on computed tomography (CT) images. Teeth were assumed to be rigid bodies, and rotational moments ranging from 1.0 to 4.0 Nmm were exerted on the crowns. PDL was defined as a hyperelastic-viscoelastic material with a uniform thickness of 0.25 mm. The alveolar bone model was constructed using a non-uniform material with varied mechanical properties determined based on Hounsfield unit (HU) values calculated using CT images, and its bottom was fixed completely. The optimal range values of PDL compressive and tensile stress were set as 0.47-12.8 and 18.8-51.2 kPa, respectively, whereas that of PDL logarithmic strain was set as 0.15-0.3%. RESULTS The rotational tendency of PDL was around the long axis of teeth when loaded. The optimal range values of rotational moment for the Mandibular Lateral Incisor, canine and first premolar were 2.2-2.3, 3.0-3.1 and 2.8-2.9 Nmm, respectively, referring to the biomechanical responses of loaded PDL. Primarily, the optimal range of rotational moment was quadratically dependent on the area of PDL internal surface (i.e. area of PDL internal surface was used to indicate PDL size), as described by the fitting formula. CONCLUSIONS Biomechanical responses of PDL can be used to estimate the optimal range of rotational moment for teeth. These rotational moments were not consistent for all teeth, as demonstrated by numerical simulations. CLINICAL RELEVANCE The quantitative relationship between the area of PDL internal surface and the optimal orthodontic moment can help orthodontists to determine a more reasonable moment and further optimise clinical treatment.
Mustafa Erkan - One of the best experts on this subject based on the ideXlab platform.
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orthodontic treatment of transposition of permanent Mandibular Lateral Incisor and left canine in mixed dentition a case report
Pediatric Dentistry, 2012Co-Authors: Fidan Alakus Sabuncuoglu, Seniz Karacay, Mustafa ErkanAbstract:The purpose of this study was to present the orthodontic treatment of a uniLateral transposition of a permanent Mandibular left canine and permanent Mandibular Lateral Incisor during middle transitional dentition in a 10-year-old female. A panoramic radiograph showed the apex of the permanent Mandibular left Lateral Incisor to be resting on the mesial corner of the permanent Mandibular left canine crown, which was ectopically erupted in the proximity of the primary Mandibular left second molar. A removable appliance was used to upright the permanent Mandibular left Lateral Incisor, after which a utility arch was used until full eruption of the permanent dentition. Treatment continued with a fixed appliance system that included all teeth until the transposition of the canine and Lateral Incisor was corrected and a class I occlusion with a favorable smile was obtained (at 36 months).
Nejat Erverdi - One of the best experts on this subject based on the ideXlab platform.
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orthodontic correction of a Mandibular Lateral Incisor and canine incomplete transposition in the permanent dentition
Turkish Journal of Orthodontics, 2015Co-Authors: Kadir Beycan, Nejat ErverdiAbstract:ABSTRACT Transposition of teeth is a rare type of ectopic eruption and in incomplete transposition the crowns might be transposed, but the root apices still remain in their relatively normal positions. In this report, we describe the orthodontic treatment of a 17-year-old girl with Mandibular left Lateral Incisor and canine incomplete transposition in which the involved teeth were repositioned to their normal anatomic position within the dental arch in an acceptable treatment time period. Treatment procedure, mechanics, and sequencing used and final results are described. The final outcome was stable after 18 months of retention. (Turkish J. Orthod. 2015;28:55–63)
Gursharan Minhas - One of the best experts on this subject based on the ideXlab platform.
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Mandibular Lateral Incisor canine transposition a case series
Journal of Orthodontics, 2021Co-Authors: Othman Hameed, Aneesh Kalra, Gursharan MinhasAbstract:Dental transpositions are rare anomalies, which may present to the general dental practitioner or orthodontist. Transpositions occur less frequently in the mandible compared with the maxilla, with ...
Yunfeng Liu - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of optimal range of rotational moment for the Mandibular Lateral Incisor canine and first premolar based on biomechanical responses of periodontal ligaments a case study
Clinical Oral Investigations, 2021Co-Authors: Yunfeng Liu, Dongcai Wang, Xingtao Dong, Qianli Sun, Gang ChenAbstract:The objective of this study was to investigate the optimal range of rotational moment for the Mandibular Lateral Incisor, canine and first premolar to determine tooth movements during orthodontic treatment using hydrostatic stress and logarithmic strain on the periodontal ligament (PDL) as indicators by numerical simulations. Teeth, PDL and alveolar bone numerical models were constructed as analytical objects based on computed tomography (CT) images. Teeth were assumed to be rigid bodies, and rotational moments ranging from 1.0 to 4.0 Nmm were exerted on the crowns. PDL was defined as a hyperelastic–viscoelastic material with a uniform thickness of 0.25 mm. The alveolar bone model was constructed using a non-uniform material with varied mechanical properties determined based on Hounsfield unit (HU) values calculated using CT images, and its bottom was fixed completely. The optimal range values of PDL compressive and tensile stress were set as 0.47–12.8 and 18.8–51.2 kPa, respectively, whereas that of PDL logarithmic strain was set as 0.15–0.3%. The rotational tendency of PDL was around the long axis of teeth when loaded. The optimal range values of rotational moment for the Mandibular Lateral Incisor, canine and first premolar were 2.2–2.3, 3.0–3.1 and 2.8–2.9 Nmm, respectively, referring to the biomechanical responses of loaded PDL. Primarily, the optimal range of rotational moment was quadratically dependent on the area of PDL internal surface (i.e. area of PDL internal surface was used to indicate PDL size), as described by the fitting formula. Biomechanical responses of PDL can be used to estimate the optimal range of rotational moment for teeth. These rotational moments were not consistent for all teeth, as demonstrated by numerical simulations. The quantitative relationship between the area of PDL internal surface and the optimal orthodontic moment can help orthodontists to determine a more reasonable moment and further optimise clinical treatment.
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numerical simulation of optimal range of rotational moment for the Mandibular Lateral Incisor canine and first premolar based on biomechanical responses of periodontal ligaments a case study
Clinical Oral Investigations, 2020Co-Authors: Yunfeng Liu, Dongcai Wang, Xingtao Dong, Qianli Sun, Gang ChenAbstract:OBJECTIVES The objective of this study was to investigate the optimal range of rotational moment for the Mandibular Lateral Incisor, canine and first premolar to determine tooth movements during orthodontic treatment using hydrostatic stress and logarithmic strain on the periodontal ligament (PDL) as indicators by numerical simulations. MATERIAL AND METHODS Teeth, PDL and alveolar bone numerical models were constructed as analytical objects based on computed tomography (CT) images. Teeth were assumed to be rigid bodies, and rotational moments ranging from 1.0 to 4.0 Nmm were exerted on the crowns. PDL was defined as a hyperelastic-viscoelastic material with a uniform thickness of 0.25 mm. The alveolar bone model was constructed using a non-uniform material with varied mechanical properties determined based on Hounsfield unit (HU) values calculated using CT images, and its bottom was fixed completely. The optimal range values of PDL compressive and tensile stress were set as 0.47-12.8 and 18.8-51.2 kPa, respectively, whereas that of PDL logarithmic strain was set as 0.15-0.3%. RESULTS The rotational tendency of PDL was around the long axis of teeth when loaded. The optimal range values of rotational moment for the Mandibular Lateral Incisor, canine and first premolar were 2.2-2.3, 3.0-3.1 and 2.8-2.9 Nmm, respectively, referring to the biomechanical responses of loaded PDL. Primarily, the optimal range of rotational moment was quadratically dependent on the area of PDL internal surface (i.e. area of PDL internal surface was used to indicate PDL size), as described by the fitting formula. CONCLUSIONS Biomechanical responses of PDL can be used to estimate the optimal range of rotational moment for teeth. These rotational moments were not consistent for all teeth, as demonstrated by numerical simulations. CLINICAL RELEVANCE The quantitative relationship between the area of PDL internal surface and the optimal orthodontic moment can help orthodontists to determine a more reasonable moment and further optimise clinical treatment.