Highly producible method for determination of occlusal vertical dimension: relationship between measurement of lip contact position with the closed mouth and area of upper prolabium

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  • Watarai Yuko
    Functional Occlusal Treatment, The Nippon Dental University Graduate School of Life Dentistry at Niigata
  • Mizuhashi Fumi
    Department of Removable Prosthodontics, The Nippon Dental University School of Life Dentistry at Niigata
  • Sato Toshihide
    Department of Removable Prosthodontics, The Nippon Dental University School of Life Dentistry at Niigata
  • Koide Kaoru
    Functional Occlusal Treatment, The Nippon Dental University Graduate School of Life Dentistry at Niigata Department of Removable Prosthodontics, The Nippon Dental University School of Life Dentistry at Niigata

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<p>Purpose: A new method inducing the physiologic rest position of the mandible using the lip contact position with the closed mouth have compared with those obtained using conventional methods of placing the mandible in the physiologic rest position.</p><p>Methods: The lip contact position with the closed mouth as a method was investigated whether the technique was useful for determining the occlusal vertical dimension. The relationship between the space between the maxillary and mandibular front teeth in the lip contact position with the closed mouth and the areas of the prolabia was also investigated.</p><p>Results: Median space between the maxillary and mandibular front teeth in the lip contact position with the closed mouth was 1.53 mm, a value intermediate between the value of 2.16 mm in the resting mandibular position obtained by the conventional technique and that of 1.33 mm in the swallowing position. The coefficient of variation of the space in the lip contact position with the closed mouth was significantly lower than those in the resting mandibular position and in the swallowing position. A significant positive correlation was recognized between the space in the lip contact position with the closed mouth and the area of the prolabium of the upper lip.</p><p>Conclusions: These results clarified that the lip contact position with the closed mouth obtained the excellent reproducibility comparing to the conventional methods. These findings suggested that the area of the prolabium of the upper lip might offer an effective index for individual determination of the correct free-way space.</p>

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