H angle hard tissue, H angle soft tissue and visual perception of a facial profile of a skeletal type II Thai female
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Abstract
Objectives: To compare the correlation of H angle hard tissue and H angle soft tissue with the visual perception of skeletal type II patients.
Materials and Methods: 59 lateral cephalograms of female patients from year 2016 to 2018 were hand traced and analysed by using ANB > 5.69 to define skeletal type II category. The principal investigator then traced the soft tissue profile outline of the cephalograms and transformed it into silhouettes for performing profile rating by the specialists. Profile ratings were done by two orthodontists on Visual Analogue Scale (VAS) with increasing levels of convexity. Rankings of visual perceptions (profile rating) were correlated with cephalometric measurements using Spearman correlation coefficient.
Results: Our result showed that there was no statistically significant difference between the correlation of H angle hard tissue with the visual perception and the correlation of H angle soft tissue with the visual perception. The analysis of correlation between H angle hard tissue and H angle soft tissue showed a statistically significant correlation. The increase in facial convexity was correlated with higher values of both H angle hard tissue and H angle soft tissue. In this study, H angle hard tissue and H angle soft tissue showed comparatively an almost equal correlation with values of 0.63 and 0.65 respectively.
Conclusion: Both H angle hard tissue and H angle soft tissue had almost equal agreement with the visual perception. Hence either one of the H angles (H angle hard tissue or H angle soft tissue) can be used in cephalometric analysis to determine the facial profile of a skeletal type II patients.
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References
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