J Shanghai Jiaotong Univ Sci ›› 2021, Vol. 26 ›› Issue (3): 284-289.doi: 10.1007/s12204-021-2294-4

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Accuracy Assessment of a Novel Radiographic Method to Evaluate Guided Bone Regeneration Outcomes Using a 3D-Printed Model

SHI Junyu (史俊宇), LI Yuan (李元), ZHANG Xiao (张枭), ZHANG Xiaomeng (张晓梦), LAI Hongchang (赖红昌)   

  1.  (Department of Implant Dentistry, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine,
    Shanghai 200011, China; College of Stomatology, Shanghai Jiao Tong University, Shanghai 200011, China;
    National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai 200011, China;
    Shanghai Key Laboratory of Stomatology, Shanghai 200011, China)
  • 出版日期:2021-06-28 发布日期:2021-06-02
  • 通讯作者: LAI Hongchang (赖红昌) E-mail:lhc9@hotmail.com

Accuracy Assessment of a Novel Radiographic Method to Evaluate Guided Bone Regeneration Outcomes Using a 3D-Printed Model

SHI Junyu (史俊宇), LI Yuan (李元), ZHANG Xiao (张枭), ZHANG Xiaomeng (张晓梦), LAI Hongchang (赖红昌)   

  1. (Department of Implant Dentistry, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine,
    Shanghai 200011, China; College of Stomatology, Shanghai Jiao Tong University, Shanghai 200011, China;
    National Center for Stomatology, National Clinical Research Center for Oral Diseases, Shanghai 200011, China;
    Shanghai Key Laboratory of Stomatology, Shanghai 200011, China)
  • Online:2021-06-28 Published:2021-06-02
  • Contact: LAI Hongchang (赖红昌) E-mail:lhc9@hotmail.com
  • Supported by:
    the Project of Science and Technology
    Commission of Shanghai Municipality
    (No. 19411950100), the Multicenter Clinical Research
    Program of Shanghai Jiao Tong University
    School of Medicine (No. DLY201822), and the Fundamental
    Research Program Funding of Ninth People’s
    Hospital affiliated to Shanghai Jiao Tong University
    School of Medicine (No. JYZZ102)

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摘要： The aim of this study was to evaluate the accuracy and reproducibility of a morphological contour  interpolation (MCI) based segmentation method for the volumetric measurement of bone grafts around implants.  Three 3D-printed models (one with a cylinder and two with a geometrically-complex form) were fabricated to  simulate implant placement with a simultaneous guided bone regeneration (GBR) procedure. All models were  scanned using a cone beam computed tomography (CBCT) instrument with the same parameters. The true  volumes of the bone grafts in the models were assessed using computer-aided calculation (controls). For the test  measurements, both manual and MCI-based methods were used. A comparison between the measured and true  volumes was performed to evaluate the accuracy. The coefficients of variation of repeated measurements were  calculated to evaluate the reproducibility. In addition, the execution time was recorded and a comparison between  the two methods was performed. The high accuracy of the MCI-based method was found with differences between  the measured value and actual volume, which never exceeded 7.3%. Excellent reproducibility was shown, with  coefficients of variation never exceeding 1.1%. A shorter execution time was observed for the MCI-based method  than for the manual method. Within the confines of this study, the MCI-based method may be suitable for  volumetric measurements of grafted bone around implants.

Abstract: The aim of this study was to evaluate the accuracy and reproducibility of a morphological contour  interpolation (MCI) based segmentation method for the volumetric measurement of bone grafts around implants.  Three 3D-printed models (one with a cylinder and two with a geometrically-complex form) were fabricated to  simulate implant placement with a simultaneous guided bone regeneration (GBR) procedure. All models were  scanned using a cone beam computed tomography (CBCT) instrument with the same parameters. The true  volumes of the bone grafts in the models were assessed using computer-aided calculation (controls). For the test  measurements, both manual and MCI-based methods were used. A comparison between the measured and true  volumes was performed to evaluate the accuracy. The coefficients of variation of repeated measurements were  calculated to evaluate the reproducibility. In addition, the execution time was recorded and a comparison between  the two methods was performed. The high accuracy of the MCI-based method was found with differences between  the measured value and actual volume, which never exceeded 7.3%. Excellent reproducibility was shown, with  coefficients of variation never exceeding 1.1%. A shorter execution time was observed for the MCI-based method  than for the manual method. Within the confines of this study, the MCI-based method may be suitable for  volumetric measurements of grafted bone around implants.

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