Correlation between H angles and visual perception in skeletal type I females

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Kitpat Lersinghanart
Supatchai Boonpratham
Suwannee Luppanapornlarp


Objective: To study the agreement among the hard tissue H angle, soft tissue H angle, and visual perception of facial profile in Thai patients with skeletal type I patterns.

Material and methods: Sixty-one lateral cephalograms of female patients of skeletal Type I patterns (ANB 1.97-5.69°) were hand traced and analysed. The outlines of the soft tissue profile of all cephalograms were separately traced and distributed to ten orthodontic residents to be rated for the convexity of the soft tissue profile using a visual analogue scale (VAS). Spearman’s rank-order correlation tests were used to analyse the relationship among the H angles and visual perception score.

Results: The mean values of the soft tissue and hard tissue H angles are 15.25±2.73° and 11.13±2.82° respectively, while the mean visual perception score points towards a very slightly convex profile. The soft tissue and hard tissue H angles were moderately correlated with each other (r=0.713; p<0.01). There were significant and equal correlations between the soft and hard tissue H angles with the visual perception score (r=0.441; p<0.01).

Conclusion: Both the soft and hard tissue H angles had the same degree of agreement with visual perception of the facial profile; hence, clinicians can choose either measurement to define the soft tissue profile in skeletal Type I adult patients.


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Lersinghanart K, Boonpratham S, Luppanapornlarp S. Correlation between H angles and visual perception in skeletal type I females. M Dent J [Internet]. 2020 Nov. 12 [cited 2023 Dec. 2];40(3):257-66. Available from:
Original articles


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