Analysis of mandibular incisor position in Japanese adults : Assessment based on the Holdaway ratio

概要

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We investigated how the position of the mandibular incisors relates to an acceptable soft tissue profile in Japanese adults. The E-line was used to evaluate esthetics. In addition, the 108 subjects were divided into four groups, and the Holdaway ratio was determined for each group. We found that all the subjects had a positive distance from the pogonion to the NB line of between 0.1mm and 4.2mm. The positions of the mandibular incisors could be moved by modifying the distance from the pogonion to the NB line. We determined that an acceptable Holdaway ratio in Japanese adults was 2:1 in the subjects who had 3mm positive distance from the pogonion to the NB line, and 3:1 in the subjects who had 2mm of distance. These results suggest that about 6mm is a desirable figure for the distance from the mandibular central incisor (L1) to the NB line as the final treatment target in Japanese adults.
大阪歯科学会の論文