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KMID : 0353319930170020299
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Oral Biology Research
1993 Volume.17 No. 2 p.299 ~ p.309
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Evaluation of the Lip during Smile in Normal Occlusion Adults
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Chi Kuk-Sop
Kim Kwang-Won
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Abstract
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This study was performed to make the criteria of the esthetic smile that was necessary to improve the esthetic problem in oral and maxillo-facial region.
The facial straight photographs of 62 adults(30 males, 32 females:19-24 years old) in resting position and during smile were taken. The measurements and proportion of lip-teeth relationship during smile were statistically analized with
photogrammetry.
@ES The following results were obtained:
@EN 1. In the evaluation of the change of lips, smile line ratio was 0.93, buccal corridor ratio was 0.63, and smile symmetry ratio was 0.96.
2. The width of mouth during smile was 1.31 times of the width in the resting position and 0.48 times of the face width.
3. The upper lip height during smile was 0.69 times of the height in the resting position and the lower lip height during smile was 0.93 times of the height in the resting position.
4. The mean exposed length of upper central incisor was 9.96mm. Maxillary incisor exposure was significantly correlated with the upper lip change ratio, mouth width change ratio, and buccal corridor ratio.
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