Soft tissue measurements of Iraqi individuals with Cl I and Cl III skeletal pattern: a comparative cephalometric study
DOI:
https://doi.org/10.32828/mdj.v8i2.321Keywords:
Key words: Labiomental angle, profile thickness, skeletal Cl IIIAbstract
This study was planned to compare some of the soft tissue measurements in
individuals with skeletal Cl I and Cl III, to find out the measurements which may be
used as a clinical diagnostic aid to discriminate between both skeletal classes.
Seventy three digital true lateral cephalometric radiographs of Iraqi adults were
divided according to the ANB angle into 38 skeletal Cl I and 35 Cl III. The soft tissue
measurements were analyzed using AutoCAD (2007) software computer program.
Descriptive statistics were used to describe the measurements, while independent
samples t-test was used to rule out gender differences and skeletal class differences.
Gender differences were found significantly in skeletal Cl I for all linear
measurements; while in Cl III the significant differences were limited to the
anteropoterior measurements only (modified profile thickness at upper lip, modified
profile thickness at lower lip, upper lip thickness, and lower lip thickness), with non
significant difference for vertical linear measurements (upper and lower Lip height
and Mouth height). All angular measurements showed non-significant gender
differences. Independent samples t-test revealed that the main differences between
classes were found in the labiomental and soft tissue profile angles, which were
significantly higher in Cl III than Cl I, while the modified profile thickness at upper
lip was significantly higher in Cl I than Cl III, for both genders and for the total
sample. Lower lip height, mouth height, and the upper lip height also showed
significant differences between classes but with less importance.
The labiomental angle and modified profile thickness at upper lip can be used as
diagnostic aids to discriminate whether the subject has a Cl I or Cl III skeletal
relation.

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