JOURNAL OF OSAKA DENTAL UNIVERSITY

Vol. 41 No. 2      OCTOBER - 2007

ISSN: 0475-2058      UBIC: 172

SUMMARY

We investigated how the vertical position of the mandibular incisors relates to an acceptable soft tissue profile in 100 Japanese adults. The E-line was used to evaluate esthetics. The subjects were divided into four groups based on the mandibular plane angle, and the distance of the maxillary and mandibular incisors from the Xi-stomion line was calculated for each group. We found that all subjects had a negative distance from the maxillary central incisor to the Xi-stomion line of between 2.7 mm and 3.6 mm. The distance from the mandibular central incisors to the Xi-stomion line could be modified by changing the FMA. These results suggest that it is necessary to consider both the horizontal and vertical positions of the mandibular central incisors to achieve good orthodontic results. (J Osaka Dent Univ 2007 ; 41: 115-119) Key words: Vertical incisor position; Cephalometric analysis; Xi-stomion line.

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