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2003 Fiscal Year Final Research Report Summary

Orthognathic Surgical planning based on Soft Computing Science including Self Organizing Map

Research Project

Project/Area Number 13672181
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 矯正・小児・社会系歯学
Research InstitutionFukuoka College of Health Sciences

Principal Investigator

MASUI Ichiro  Fukuoka College of Health Sciences, Department of Oral Hygiene, Professor, 歯科衛生学科, 教授 (50131884)

Co-Investigator(Kenkyū-buntansha) MIKI Tsutomu  Kyushu Institute of Technology, Graduate school of Life Science and Systems Engineering, Associate Professor, 大学院・生命体工学研究科, 助教授 (20231607)
YAMAKAWA Takeshi  Kyushu Institute of Technology, Graduate school of Life Science and Systems Engineering, Professor, 大学院・生命体工学研究科, 教授 (00005547)
Project Period (FY) 2001 – 2003
KeywordsJaw deformity / Classification of Profile / Planning of orthognathic surgery / Soft computing / Cephalogram / Prediction of postoperative profile / Application software / Graphical Database
Research Abstract

We developed an artificial intelligent system based on soft computing for planning of orthognathic surgery in surgical correction of jaw deformities.
The self-organizing map neural network (SOM) has a feature of a mapping from a high dimensional space to a low dimensional space with keeping its topology. Accordingly, similar cases are closely located on the map. Using this feature, we applied SOM to classification of soft-tissue profiles of jaw deformities. Materials were pre-and post-operative lateral cephalograms of 44 patients. Soft-tissue profiles were measured and classified (diagnosed) into seven groups. Eleven soft-tissue measurements were selected as input vector of SOM. The genetic algorithm (GA) was employed to optimize coefficients for each measurement. The hierarchical classification method based SOM and GA resulted about 100% corresponding to the previous profile diagnosis.
In planning of orthognathic surgery case, it is meaningful to refer the past documentation similar to the new case. We constructed database software that automatically searches for similar cases from a number of various cases stored by means of SOM. It is also useful to predict the profile after surgery. Profile change is a nonlinear result from the interaction of not only skeletal movement but also soft tissue thickness. Using neo fuzzy neuron that can approximate a nonlinear relationship between inputs and outputs. Comparing prediction errors between the neo frizzy neuron method and the linear multiple regression method, the neo fuzzy neuron method was suitable for prediction of resultant profile after orthognathic surgery. A photograph of the patient's predicted profile can be made from that before surgery using morphing technique.

  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] K.Horio, I.Masui, M.Kumamoto, T.Yamakawa: "Hierarchical Classification Method Based on Self-Organizing Maps and Genetic Algorithm"Proc.of the 1st Int.Conf.on Soft Computing and Intelligent Systems (SCIS2002). CD-ROM. (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 堀尾恵一, 升井一朗, 山川 烈: "症型分類に基づいた顎変形症術後側貌の予測"バイオメディカル・ファジイ・システム学会第15回年次大会講演予稿集. 1. 21-24 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山川 烈, 升井一朗, 堀尾恵一, 熊本将志: "重み付き距離測度を用いた階層型自己組織化マップによる分類手法"第3回自己組織化マップ研究会予稿集. 1・1. 39-42 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 堀尾恵一, 升井一朗, 山川 烈: "SOMを応用した軟組織側貌分類に基づく顎変形症診断"バイオメディカル・ファジイ・システム学会第14回年次大会講演予稿集. 1. 38-41 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Keiichi Horio, Ichiro Masui, Masashi Kumamoto, Takeshi Yamakawa: "HIERARCHICAL CLASSIFICATION METHOD BASED ON SELF-ORGANIZING MAPS AND GENETIC ALGORITHM"Proceedings of the 1st International Conference on Soft Computing and Intelligent Systems (SCIS2002). (CD Rom). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Keiichi Horio, Ichiro Masui, Masashi Kumamoto, Takeshi Yamakawa: "PREDICTION OF RESULTANT PROFILE AFTER ORTHOGNATHIC SURGERY BASED ON CLASSIFICATION OF PROFILE BEFORE SURGERY"Proceedings of the 15th Annual Meeting of Biomedical Fuzzy Systems Association. 1(1). 21-24 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Keiichi Horio, Ichiro Masui, Masashi Kumamoto, Takeshi Yamakawa: "SELF ORGANIZING MAP CONSIDERING CORRELATION BETWEEN ELEMENTS IN THE INPUT VECTOR AND ITS APPLICATION TO CLASSIFICATION OF FACIAL PROFILE"Proceedings of the 14th Annual Meeting of Biomedical Fuzzy Systems Association. 1(1). 38-41 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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