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Christian Freudlsperger - One of the best experts on this subject based on the ideXlab platform.

  • accuracy of patient specific implants and additive manufactured surgical Splints in orthognathic surgery a three dimensional retrospective study
    Journal of Cranio-maxillofacial Surgery, 2019
    Co-Authors: Thomas Ruckschlos, Oliver Ristow, Reinald Kühle, Sebastian Zingler, Michael Engel, Jürgen Hoffmann, M W Muller, Christian Freudlsperger
    Abstract:

    Abstract Introduction Because of the many limitations of conventional surgery planning for the treatment of orthognathic deformities, as well as advancements in computer-assisted planning, there is an urgent need for technical devices that transfer the surgical plan into the operating theatre. In this regard, additive-manufactured, patient-specific implants (PSI) and additive-manufactured interocclusal Splints represent promising approaches. The aim of this retrospective study was to compare the accuracy of these two devices, with regard to preoperative virtual treatment planning for maxillary Le-Fort I advancement surgery using IPS CaseDesigner®, and based on a new analysis method without the use of landmarks. Materials and methods A retrospective evaluation of 18 class III patients (n(PSI) = 9; n(Splint) = 9), who had undergone virtually planned orthognathic surgery (including maxillary Le Fort I advancement), was performed. The preoperative treatment plan and the postoperative outcome were combined to calculate the translational and rotational discrepancies between the 3D planning and the actual surgical outcome. Results For the PSI and Splint groups the accuracy of left/right positioning was 0.51 mm ± 0.48 and 1.11 mm ± 1.32 respectively. The accuracy of anterior/posterior positioning was 0.39 mm ± 0.26 and 1.42 mm ± 0.87, and that of up/down-positioning was 0.44 mm ± 0.31 and 0.62 mm ± 0.47. The rotational discrepancies were less than 2° in both groups. Conclusion: The findings demonstrate that both PSI and Splint approaches can accurately transfer the virtual planning into the operating theatre. However, PSIs show an overall higher accuracy, especially for anterior/posterior translational movement (p

  • Accuracy of patient-specific implants and additive-manufactured surgical Splints in orthognathic surgery — A three-dimensional retrospective study
    Journal of Cranio-maxillofacial Surgery, 2019
    Co-Authors: Thomas Rückschloß, Oliver Ristow, Reinald Kühle, Sebastian Zingler, Michael Engel, Jürgen Hoffmann, Michael Muller, Christian Freudlsperger
    Abstract:

    Abstract Introduction Because of the many limitations of conventional surgery planning for the treatment of orthognathic deformities, as well as advancements in computer-assisted planning, there is an urgent need for technical devices that transfer the surgical plan into the operating theatre. In this regard, additive-manufactured, patient-specific implants (PSI) and additive-manufactured interocclusal Splints represent promising approaches. The aim of this retrospective study was to compare the accuracy of these two devices, with regard to preoperative virtual treatment planning for maxillary Le-Fort I advancement surgery using IPS CaseDesigner®, and based on a new analysis method without the use of landmarks. Materials and methods A retrospective evaluation of 18 class III patients (n(PSI) = 9; n(Splint) = 9), who had undergone virtually planned orthognathic surgery (including maxillary Le Fort I advancement), was performed. The preoperative treatment plan and the postoperative outcome were combined to calculate the translational and rotational discrepancies between the 3D planning and the actual surgical outcome. Results For the PSI and Splint groups the accuracy of left/right positioning was 0.51 mm ± 0.48 and 1.11 mm ± 1.32 respectively. The accuracy of anterior/posterior positioning was 0.39 mm ± 0.26 and 1.42 mm ± 0.87, and that of up/down-positioning was 0.44 mm ± 0.31 and 0.62 mm ± 0.47. The rotational discrepancies were less than 2° in both groups. Conclusion: The findings demonstrate that both PSI and Splint approaches can accurately transfer the virtual planning into the operating theatre. However, PSIs show an overall higher accuracy, especially for anterior/posterior translational movement (p

Anil Dhal - One of the best experts on this subject based on the ideXlab platform.

  • Catapult Splint: A foot dorsiflexion assist Splint
    Foot and Ankle Surgery, 2011
    Co-Authors: Vineet Jain, Mayank Agrawal, Anil Dhal
    Abstract:

    Abstract Background Loss of dorsiflexion is a common problem in cases where an external fixator or Ilizarov assembly is applied. It results in functional impairment of the foot by affecting the swing phase of gait cycle. We devised a simple dynamic dorsiflexion assist Splint for prevention, correction of equinus/cavus deformity and maintenance of normal dorsiflexion of foot. Methods This prospective study used a rubber Splint styled in the shape of a catapult, made of discarded car rubber tubes attached to the frame of fixator in 50 patients. Results In 17 patients there was varying amount of loss of dorsiflexion at the time of application of Splint while in 22 patients it was applied soon after the application of the fixator. In the rest of patients it was applied for cavus deformity. Out of 17 patients 10 had complete recovery of dorsiflexion. 22 patients in whom it was applied at the outset had normal range of movement at ankle. Correction was achieved in all 6 cases of cavus deformity and prevented its occurrence in the rest of 5 cases. Conclusion Catapult Splint is a low cost foot dorsiflexion assist Splint.

  • Catapult Splint: A foot dorsiflexion assist Splint
    Foot and Ankle Surgery, 2011
    Co-Authors: Vineet Jain, Mayank Agrawal, Anil Dhal
    Abstract:

    Background: Loss of dorsiflexion is a common problem in cases where an external fixator or Ilizarov assembly is applied. It results in functional impairment of the foot by affecting the swing phase of gait cycle. We devised a simple dynamic dorsiflexion assist Splint for prevention, correction of equinus/cavus deformity and maintenance of normal dorsiflexion of foot. Methods: This prospective study used a rubber Splint styled in the shape of a catapult, made of discarded car rubber tubes attached to the frame of fixator in 50 patients. Results: In 17 patients there was varying amount of loss of dorsiflexion at the time of application of Splint while in 22 patients it was applied soon after the application of the fixator. In the rest of patients it was applied for cavus deformity. Out of 17 patients 10 had complete recovery of dorsiflexion. 22 patients in whom it was applied at the outset had normal range of movement at ankle. Correction was achieved in all 6 cases of cavus deformity and prevented its occurrence in the rest of 5 cases. Conclusion: Catapult Splint is a low cost foot dorsiflexion assist Splint. © 2011 European Foot and Ankle Society.

Thomas Ruckschlos - One of the best experts on this subject based on the ideXlab platform.

  • accuracy of patient specific implants and additive manufactured surgical Splints in orthognathic surgery a three dimensional retrospective study
    Journal of Cranio-maxillofacial Surgery, 2019
    Co-Authors: Thomas Ruckschlos, Oliver Ristow, Reinald Kühle, Sebastian Zingler, Michael Engel, Jürgen Hoffmann, M W Muller, Christian Freudlsperger
    Abstract:

    Abstract Introduction Because of the many limitations of conventional surgery planning for the treatment of orthognathic deformities, as well as advancements in computer-assisted planning, there is an urgent need for technical devices that transfer the surgical plan into the operating theatre. In this regard, additive-manufactured, patient-specific implants (PSI) and additive-manufactured interocclusal Splints represent promising approaches. The aim of this retrospective study was to compare the accuracy of these two devices, with regard to preoperative virtual treatment planning for maxillary Le-Fort I advancement surgery using IPS CaseDesigner®, and based on a new analysis method without the use of landmarks. Materials and methods A retrospective evaluation of 18 class III patients (n(PSI) = 9; n(Splint) = 9), who had undergone virtually planned orthognathic surgery (including maxillary Le Fort I advancement), was performed. The preoperative treatment plan and the postoperative outcome were combined to calculate the translational and rotational discrepancies between the 3D planning and the actual surgical outcome. Results For the PSI and Splint groups the accuracy of left/right positioning was 0.51 mm ± 0.48 and 1.11 mm ± 1.32 respectively. The accuracy of anterior/posterior positioning was 0.39 mm ± 0.26 and 1.42 mm ± 0.87, and that of up/down-positioning was 0.44 mm ± 0.31 and 0.62 mm ± 0.47. The rotational discrepancies were less than 2° in both groups. Conclusion: The findings demonstrate that both PSI and Splint approaches can accurately transfer the virtual planning into the operating theatre. However, PSIs show an overall higher accuracy, especially for anterior/posterior translational movement (p

Vineet Jain - One of the best experts on this subject based on the ideXlab platform.

  • Catapult Splint: A foot dorsiflexion assist Splint
    Foot and Ankle Surgery, 2011
    Co-Authors: Vineet Jain, Mayank Agrawal, Anil Dhal
    Abstract:

    Abstract Background Loss of dorsiflexion is a common problem in cases where an external fixator or Ilizarov assembly is applied. It results in functional impairment of the foot by affecting the swing phase of gait cycle. We devised a simple dynamic dorsiflexion assist Splint for prevention, correction of equinus/cavus deformity and maintenance of normal dorsiflexion of foot. Methods This prospective study used a rubber Splint styled in the shape of a catapult, made of discarded car rubber tubes attached to the frame of fixator in 50 patients. Results In 17 patients there was varying amount of loss of dorsiflexion at the time of application of Splint while in 22 patients it was applied soon after the application of the fixator. In the rest of patients it was applied for cavus deformity. Out of 17 patients 10 had complete recovery of dorsiflexion. 22 patients in whom it was applied at the outset had normal range of movement at ankle. Correction was achieved in all 6 cases of cavus deformity and prevented its occurrence in the rest of 5 cases. Conclusion Catapult Splint is a low cost foot dorsiflexion assist Splint.

  • Catapult Splint: A foot dorsiflexion assist Splint
    Foot and Ankle Surgery, 2011
    Co-Authors: Vineet Jain, Mayank Agrawal, Anil Dhal
    Abstract:

    Background: Loss of dorsiflexion is a common problem in cases where an external fixator or Ilizarov assembly is applied. It results in functional impairment of the foot by affecting the swing phase of gait cycle. We devised a simple dynamic dorsiflexion assist Splint for prevention, correction of equinus/cavus deformity and maintenance of normal dorsiflexion of foot. Methods: This prospective study used a rubber Splint styled in the shape of a catapult, made of discarded car rubber tubes attached to the frame of fixator in 50 patients. Results: In 17 patients there was varying amount of loss of dorsiflexion at the time of application of Splint while in 22 patients it was applied soon after the application of the fixator. In the rest of patients it was applied for cavus deformity. Out of 17 patients 10 had complete recovery of dorsiflexion. 22 patients in whom it was applied at the outset had normal range of movement at ankle. Correction was achieved in all 6 cases of cavus deformity and prevented its occurrence in the rest of 5 cases. Conclusion: Catapult Splint is a low cost foot dorsiflexion assist Splint. © 2011 European Foot and Ankle Society.

Jan Egger - One of the best experts on this subject based on the ideXlab platform.

  • development of a computer aided design software for dental Splint in orthognathic surgery
    Scientific Reports, 2016
    Co-Authors: Xiaojun Chen, Xing Li, Lu Xu, Yiting Sun, Constantinus Politis, Jan Egger
    Abstract:

    In the orthognathic surgery, dental Splints are important and necessary to help the surgeon reposition the maxilla or mandible. However, the traditional methods of manual design of dental Splints are difficult and time-consuming. The research on computer-aided design software for dental Splints is rarely reported. Our purpose is to develop a novel special software named EasySplint to design the dental Splints conveniently and efficiently. The design can be divided into two steps, which are the generation of initial Splint base and the Boolean operation between it and the maxilla-mandibular model. The initial Splint base is formed by ruled surfaces reconstructed using the manually picked points. Then, a method to accomplish Boolean operation based on the distance filed of two meshes is proposed. The interference elimination can be conducted on the basis of marching cubes algorithm and Boolean operation. The accuracy of the dental Splint can be guaranteed since the original mesh is utilized to form the result surface. Using EasySplint, the dental Splints can be designed in about 10 minutes and saved as a stereo lithography (STL) file for 3D printing in clinical applications. Three phantom experiments were conducted and the efficiency of our method was demonstrated.