Reproducibility of the Neutral Zone Recording on the Estimated Occlusal Plane

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  • Morikawa Masao
    First Department of Prosthetic Dentistry Kyushu Dental College
  • Ryo Shinki
    First Department of Prosthetic Dentistry Kyushu Dental College
  • Shimizu Toshihiro
    First Department of Prosthetic Dentistry Kyushu Dental College
  • Yasumoto Kazuo
    First Department of Prosthetic Dentistry Kyushu Dental College
  • Toyoda Shizuo
    First Department of Prosthetic Dentistry Kyushu Dental College
  • Kozono Yoshio
    Department of Materials Science Kyushu Dental College
  • Sato Hironobu
    Second Department of Prosthetic Dentistry Nagasaki University School of Dentistry

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Other Title
  • 仮想咬合平面上におけるニュートラルゾーンの再現性について
  • 仮想咬合平面上におけるニュートラルゾーンの再現性について〔英文〕
  • カソウ コウゴウ ヘイメンジョウ ニ オケル ニュートラルゾーン ノ サイゲン

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Abstract

Several numbers of the neutral zone records were made repeatedly under the same condition for each patient in this study. Although any of the neutral zone records was clinically judged to be satisfactory in function by the practitioner and the patient, it was found through the statistical analyses for labio, bucco-lingual mid-point and width of the neutral zone that the reproducibility of the neutral zone recording was much poorer than ever expected. Frequency of one record being significantly different in mid-point from other records obtained for the same patient was 55.4% in the incisal region and 66.4% in the molar. While in width, the frequency was 41.8% in the incisal and 49.1% in the molar. The center line of the neutral zone record was located on the labial and buccal side of the alveolar crest in almost all the cases. Average distance of the mid-point from the crest was 4.66mm in the incisal region and 1.87mm in the molar. Deviation of the mid-point by repetition was found to be larger in the incisal than in the molar. Width of the neutral zone record, on the contrary, deviated more widely in the molar than in the incisal. Positive correlation was recognized by regression analyses between the positions of the mid-point in the incisal region and in the molar, and between the width of the neutral zone in the both regions. No relationships could be found between the values of the width and the mid-point at the corresponding reference point. When the neutral zone records were made under some altered conditions, reasonable changes were observed on the records. No differences, however, could be detected between the different practitioners. It was found from this fact that the performance of the neutral zone record may mainly depend on the functional movements of the patient, but scarcely on the practitioner's skill so far as he has experienced in this technique.

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