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Hom-lay Wang - One of the best experts on this subject based on the ideXlab platform.

  • risk assessment of Lingual Plate perforation in posterior mandibular region a virtual implant placement study using cone beam computed tomography
    Journal of Periodontology, 2011
    Co-Authors: Hsun Liang Chan, Erika Benavides, Jia Hui Fu, Ivan Rudek, Hom-lay Wang
    Abstract:

    Background: Lingual Plate perforation at the time of implant placement in posterior mandible is a potential surgical complication, and presence of a Lingual concavity is considered a risk factor. Little is known about the spatial relationship between implant and Lingual Plate. The role of Lingual concavity in the risk of Lingual perforation has not yet been fully studied. This computer-simulated study investigates the incidence of Lingual Plate perforation in edentulous mandibular first molar region and the risk of perforation in the area of Lingual concavity.Methods: One hundred and three qualified cone-beam computed tomography scans were selected from the database. Implants of various dimensions were virtually placed into the area using computer software. The distance between implant tip and Lingual Plate was measured using a digital caliper. Incidence of Lingual Plate perforation and proximity of the implant tip to Lingual Plate were measured for three types of cross-sectional mandibular morphology.Res...

  • Risk of Lingual Plate perforation during implant placement in the posterior mandible: a human cadaver study.
    Implant dentistry, 2011
    Co-Authors: Daylene Jack Min Leong, Hsun Liang Chan, Chu Yuan Yeh, Nikolaos Takarakis, Hom-lay Wang
    Abstract:

    Aim To determine the risk of Lingual Plate perforations using 2 different implants during implant installation in the posterior mandible, so as to avoid a potentially life-threatening situation and/or a compromise of the success of the surgical procedure. Materials and methods Nine human cadaver jaws and 16 edentulous sites with missing mandibular posterior teeth were used. Upon flap reflection, 3.7 × 10.0 mm and 3.7 × 13 mm Tapered Screw Vent implants were placed in the edentulous sites parallel to the ridge over the center of the alveolar ridge. The occurrence of Lingual Plate perforations was assessed visually, and the distance of the fenestration from the alveolar ridge crest, if any, was measured. Results Nineteen dental implants of each were placed in the second premolar and first molar regions. No Lingual concavity perforations were found in all sites, except for a Lingual fenestration in 1 first molar site when placing the 3.7 × 10 mm implant (0.053%). Conclusion The risk of a Lingual cortical Plate fenestration or perforation, due to Lingual concavity, in an edentulous posterior mandible in the region of the second premolar or first molar was found to be 0.053% if a regular 3.7-mm diameter tapered implant was used. In the presence of significant Lingual concavity in the posterior mandible, a smaller regular diameter implant with a tapered design should be considered to avoid a potential fatal damage of vital structures.

  • the significance of the Lingual nerve during periodontal implant surgery
    Journal of Periodontology, 2010
    Co-Authors: Hsun Liang Chan, Daylene J.m. Leong, Chu Yuan Yeh, Nikolaos Tatarakis, Hom-lay Wang
    Abstract:

    Background: Understanding the position of the Lingual nerve is important when performing third molar extractions and periodontal and implant surgeries in the mandible. The careless management of the Lingual flap can potentially cause damage to the Lingual nerve. The location of the Lingual nerve in the third molar region was described in the literature; however, to our knowledge, its course mesial to the third molar region was not reported. The aim of this study is to identify and measure the location of Lingual nerves in relation to mandibular teeth in fresh cadaver heads.Methods: Thirty Lingual nerves from 18 cadaver heads were dissected, and the vertical distance from the Lingual nerve to the mid-Lingual cemento-enamel junctions of mandibular molars and premolars and the position where the Lingual nerve left the Lingual Plate and moved toward the tongue were determined. Two cadaver heads were randomly selected and exposed to cone-beam computed tomography (CBCT) scans after the insertion of a wrought wi...

  • The significance of the Lingual nerve during periodontal/implant surgery.
    Journal of periodontology, 2010
    Co-Authors: Hsun Liang Chan, Daylene J.m. Leong, Chu Yuan Yeh, Nikolaos Tatarakis, Hom-lay Wang
    Abstract:

    Background: Understanding the position of the Lingual nerve is important when performing third molar extractions and periodontal and implant surgeries in the mandible. The careless management of the Lingual flap can potentially cause damage to the Lingual nerve. The location of the Lingual nerve in the third molar region was described in the literature; however, to our knowledge, its course mesial to the third molar region was not reported. The aim of this study is to identify and measure the location of Lingual nerves in relation to mandibular teeth in fresh cadaver heads.Methods: Thirty Lingual nerves from 18 cadaver heads were dissected, and the vertical distance from the Lingual nerve to the mid-Lingual cemento-enamel junctions of mandibular molars and premolars and the position where the Lingual nerve left the Lingual Plate and moved toward the tongue were determined. Two cadaver heads were randomly selected and exposed to cone-beam computed tomography (CBCT) scans after the insertion of a wrought wi...

Hsun Liang Chan - One of the best experts on this subject based on the ideXlab platform.

  • risk assessment of Lingual Plate perforation in posterior mandibular region a virtual implant placement study using cone beam computed tomography
    Journal of Periodontology, 2011
    Co-Authors: Hsun Liang Chan, Erika Benavides, Jia Hui Fu, Ivan Rudek, Hom-lay Wang
    Abstract:

    Background: Lingual Plate perforation at the time of implant placement in posterior mandible is a potential surgical complication, and presence of a Lingual concavity is considered a risk factor. Little is known about the spatial relationship between implant and Lingual Plate. The role of Lingual concavity in the risk of Lingual perforation has not yet been fully studied. This computer-simulated study investigates the incidence of Lingual Plate perforation in edentulous mandibular first molar region and the risk of perforation in the area of Lingual concavity.Methods: One hundred and three qualified cone-beam computed tomography scans were selected from the database. Implants of various dimensions were virtually placed into the area using computer software. The distance between implant tip and Lingual Plate was measured using a digital caliper. Incidence of Lingual Plate perforation and proximity of the implant tip to Lingual Plate were measured for three types of cross-sectional mandibular morphology.Res...

  • Risk of Lingual Plate perforation during implant placement in the posterior mandible: a human cadaver study.
    Implant dentistry, 2011
    Co-Authors: Daylene Jack Min Leong, Hsun Liang Chan, Chu Yuan Yeh, Nikolaos Takarakis, Hom-lay Wang
    Abstract:

    Aim To determine the risk of Lingual Plate perforations using 2 different implants during implant installation in the posterior mandible, so as to avoid a potentially life-threatening situation and/or a compromise of the success of the surgical procedure. Materials and methods Nine human cadaver jaws and 16 edentulous sites with missing mandibular posterior teeth were used. Upon flap reflection, 3.7 × 10.0 mm and 3.7 × 13 mm Tapered Screw Vent implants were placed in the edentulous sites parallel to the ridge over the center of the alveolar ridge. The occurrence of Lingual Plate perforations was assessed visually, and the distance of the fenestration from the alveolar ridge crest, if any, was measured. Results Nineteen dental implants of each were placed in the second premolar and first molar regions. No Lingual concavity perforations were found in all sites, except for a Lingual fenestration in 1 first molar site when placing the 3.7 × 10 mm implant (0.053%). Conclusion The risk of a Lingual cortical Plate fenestration or perforation, due to Lingual concavity, in an edentulous posterior mandible in the region of the second premolar or first molar was found to be 0.053% if a regular 3.7-mm diameter tapered implant was used. In the presence of significant Lingual concavity in the posterior mandible, a smaller regular diameter implant with a tapered design should be considered to avoid a potential fatal damage of vital structures.

  • the significance of the Lingual nerve during periodontal implant surgery
    Journal of Periodontology, 2010
    Co-Authors: Hsun Liang Chan, Daylene J.m. Leong, Chu Yuan Yeh, Nikolaos Tatarakis, Hom-lay Wang
    Abstract:

    Background: Understanding the position of the Lingual nerve is important when performing third molar extractions and periodontal and implant surgeries in the mandible. The careless management of the Lingual flap can potentially cause damage to the Lingual nerve. The location of the Lingual nerve in the third molar region was described in the literature; however, to our knowledge, its course mesial to the third molar region was not reported. The aim of this study is to identify and measure the location of Lingual nerves in relation to mandibular teeth in fresh cadaver heads.Methods: Thirty Lingual nerves from 18 cadaver heads were dissected, and the vertical distance from the Lingual nerve to the mid-Lingual cemento-enamel junctions of mandibular molars and premolars and the position where the Lingual nerve left the Lingual Plate and moved toward the tongue were determined. Two cadaver heads were randomly selected and exposed to cone-beam computed tomography (CBCT) scans after the insertion of a wrought wi...

  • The significance of the Lingual nerve during periodontal/implant surgery.
    Journal of periodontology, 2010
    Co-Authors: Hsun Liang Chan, Daylene J.m. Leong, Chu Yuan Yeh, Nikolaos Tatarakis, Hom-lay Wang
    Abstract:

    Background: Understanding the position of the Lingual nerve is important when performing third molar extractions and periodontal and implant surgeries in the mandible. The careless management of the Lingual flap can potentially cause damage to the Lingual nerve. The location of the Lingual nerve in the third molar region was described in the literature; however, to our knowledge, its course mesial to the third molar region was not reported. The aim of this study is to identify and measure the location of Lingual nerves in relation to mandibular teeth in fresh cadaver heads.Methods: Thirty Lingual nerves from 18 cadaver heads were dissected, and the vertical distance from the Lingual nerve to the mid-Lingual cemento-enamel junctions of mandibular molars and premolars and the position where the Lingual nerve left the Lingual Plate and moved toward the tongue were determined. Two cadaver heads were randomly selected and exposed to cone-beam computed tomography (CBCT) scans after the insertion of a wrought wi...

Derong Zou - One of the best experts on this subject based on the ideXlab platform.

  • risk factors for Lingual Plate fracture during mandibular third molar extraction
    Clinical Oral Investigations, 2020
    Co-Authors: Cheng Huang, Chun Zhou, Derong Zou
    Abstract:

    OBJECTIVE The aim of this study was to predict the risk of Lingual Plate fracture during mandibular third molar (M3) extraction. MATERIALS AND METHODS Cone beam computed tomography (CBCT) data from 264 mandibular M3s (erupted and impacted) from 264 patients (104 males and 160 females; age range, 17-75 years) were retrospectively analyzed. Lingual Plate thicknesses at the levels of the mid-root and root apex of the M3s were measured and defined as "thicker" (bone thicker than 1 mm), "thinner" (bone thinner than 1 mm), or "perforated" (bone perforated by the M3 root). These measurements were correlated with potential risk factors for thinner and perforated Lingual Plates: tooth position of the mandibular M3, morphology of the Lingual Plate, and patient characteristics (age and sex). RESULTS The mean thickness of the Lingual Plate was 1.49 ± 1.38 mm at the mid-root of the M3s, and 2.35 ± 2.03 mm at the root apex. Multivariate regression analyses revealed that mesioangularly and horizontally impacted M3s were significantly associated with thinner and perforated Lingual Plates at the mid-root (P < 0.001), whereas the M3s in infra-occlusion positions (in infra-occlusion when compared with the adjacent second molar) had thinner Lingual bone at the root apex (P = 0.022 and P = 0.027, depending on the level of impaction). Female patients were less likely to have Lingual Plate perforation (P = 0.036). CONCLUSIONS Mesioangulation, infra-occlusion, and male sex were risk factors for Lingual Plate fracture. CLINICAL RELEVANCE When the risk of Lingual Plate fracture is high, a sufficiently large flap, osteotomy, and tooth section by bur or piezosurgery are recommended to create a good operative field and avoid excessive pressure on the Lingual Plate.

  • Risk factors for Lingual Plate fracture during mandibular third molar extraction.
    Clinical oral investigations, 2020
    Co-Authors: Cheng Huang, Chun Zhou, Derong Zou
    Abstract:

    OBJECTIVE The aim of this study was to predict the risk of Lingual Plate fracture during mandibular third molar (M3) extraction. MATERIALS AND METHODS Cone beam computed tomography (CBCT) data from 264 mandibular M3s (erupted and impacted) from 264 patients (104 males and 160 females; age range, 17-75 years) were retrospectively analyzed. Lingual Plate thicknesses at the levels of the mid-root and root apex of the M3s were measured and defined as "thicker" (bone thicker than 1 mm), "thinner" (bone thinner than 1 mm), or "perforated" (bone perforated by the M3 root). These measurements were correlated with potential risk factors for thinner and perforated Lingual Plates: tooth position of the mandibular M3, morphology of the Lingual Plate, and patient characteristics (age and sex). RESULTS The mean thickness of the Lingual Plate was 1.49 ± 1.38 mm at the mid-root of the M3s, and 2.35 ± 2.03 mm at the root apex. Multivariate regression analyses revealed that mesioangularly and horizontally impacted M3s were significantly associated with thinner and perforated Lingual Plates at the mid-root (P 

Jie Cheng - One of the best experts on this subject based on the ideXlab platform.

  • Topographic relationship between root apex of mesially and horizontally impacted mandibular third molar and Lingual Plate: cross-sectional analysis using CBCT
    Scientific reports, 2016
    Co-Authors: Dongmiao Wang, Yanling Wang, Guangchao Zhou, Chao Sun, Yang Lianfeng, Jianling Bai, Jun Gao, Jie Cheng
    Abstract:

    The present study was aimed to determine the topographic relationship between root apex of the mesially and horizontally impacted mandibular third molar and Lingual Plate of mandible. The original cone beam computed tomography (CBCT) data of 364 teeth from 223 patients were retrospectively collected and analyzed. The topographic relationship between root apex and Lingual Plate on cross-sectional CBCT images was classified as non-contact (99), contact (145) and perforation (120). The cross-sectional morphology of Lingual Plate at the level of root apex was defined as parallel (28), undercut (38), slanted (29) and round (4). The distribution of topographic relationship between root apex and Lingual Plate significantly associated with gender, impaction depth, root number and Lingual Plate morphology. Moreover, the average bone thickness of Lingual cortex and distance between root apex and the outer surface of Lingual Plate were 1.02 and 1.39 mm, respectively. Furthermore, multivariate regression analyses identified impaction depth and Lingual Plate morphology as the risk factors for the contact and perforation subtypes between root apex and Lingual Plate. Collectively, our findings reveal the topographic proximity of root apex of impacted mandibular third molar to the Lingual Plate, which might be associated with intraoperative and postoperative complications during tooth extraction.

Yi Shing Shieh - One of the best experts on this subject based on the ideXlab platform.

  • Risk of Lingual Plate perforation for virtual immediate implant placement in the posterior mandible: A computer simulation study
    Journal of the American Dental Association (1939), 2015
    Co-Authors: Ren-yeong Huang, David L. Cochran, Wan Chien Cheng, Ming Hung Lin, Wen Hui Fan, Cheng En Sung, Lian Ping Mau, Po Hsien Huang, Yi Shing Shieh
    Abstract:

    Abstract Background This study sought to determine which factors are correlated to a higher risk of Lingual Plate perforation (LPP) when placing a virtual implant in the area of the anticipated extraction site of the posterior mandible. Methods Computed tomographic images of 300 patients (1,279 teeth) were analyzed in regard to the shape of the mandible (convergent, parallel, or undercut type), dimensional parameters of Lingual concavity (angle, height, depth) and its relation to the inferior alveolar canal (zones A, B, C), distance from root apex to inferior alveolar canal, and probability of LPP. The odds ratio of variables was determined by multiple logistic regression modeling. Results The overall probability of LPPs on virtual implant placement was 3.1%. This perforation was most commonly observed at the second molar and with a U-type ridge. After adjusting cofounders, a concave point located in zone A is 17.34 times more likely to have a LPP than one in zone C. The probability of LPPs was reduced by 34% for every 1-millimeter increase in distance from root apex to inferior alveolar canal on virtual implant placement of posterior mandible region. Conclusions Three-dimensional cone-beam computed tomographic imaging is essential for planning immediate implant placement in the anticipated extraction sites of the posterior mandible region as proved by anatomic findings that can only be understood from preoperative imaging analysis. Practical Implications Presurgical cross-sectional images can be analyzed to identify anatomic features relative to the Lingual concavities in the posterior mandible region, which can help to avoid unpleasant complications, specifically when performing immediate implant procedures.