Abstract
The aim of the study is to evaluate and compare the soft tissue chin thickness values among adult patients with different vertical growth patterns. A sample size of 180 adults patients (32 males and 148 females), with an average age of 21.42 years (range 17- 32 years), was selected. The sample was divided into three groups according to the vertical growth pattern using SNMP angle (hypodivergent <27°, normodivergent 27-37° and hyperdivergent >37°). The soft tissue chin thicknesses in each group were measured at pogonion (Pog), gnathion (Gn), and menton (Me) and analyzed using the one-way analysis of variance and post-hoc Tukey test. The soft tissue chin thickness values were greater in hypodivergent group at Pog (12.71±2.10 mm), Gn (9.72 ± 2.55 mm) and Me (9.13 ± 2.88 mm) and smallest in hyperdivergent group (Pog 8.05 ±1.20 mm, Gn 6.07±1.47 mm, Me 5.91±1.21 mm). The soft tissue chin thicknesses were greater in men than women. Soft tissue chin thickness was greater in hypodivergent adults than those of normodivergent and hyperdivergent adults. In all the three groups, soft tissue thickness values were greater in men than women. Key words: Vertical pattern, soft tissue, thickness, adult, chin.
Highlights
The vertical pattern plays a crucial role in diagnosis and treatment planning in both orthodontic growing and adult patients (Opdebeeck and Bell, 1978; Schendel et al, 1976)
We found that the soft tissue chin thickness values were the thickest in the hypodivergent group and thinnest in the hyperdivergent group for both men and women While in normodivergent group the
The following conclusions were drawn: 1. Soft tissue chin thickness were greater in adults at pogonion, gnathion and menton in hypodivergent group
Summary
The vertical pattern plays a crucial role in diagnosis and treatment planning in both orthodontic growing and adult patients (Opdebeeck and Bell, 1978; Schendel et al, 1976). Three basic types of vertical growth pattern are said to exist: Hypo-divergent (low angle), normo-divergent (average), and hyper-divergent (high angle) (Fields et al, 1984). Those with a hypo-divergent growth pattern have reduced vertical growth which is typically associated with short face, deep anterior overbite, increased posterior to anterior facial height ratio, decreased lower facial height and reduced sella-nasion (SN)/mandibular plane (MP) angle (SN-MP) angle (Opdebeeck and Bell, 1978). The hyper-divergent growth pattern have increased vertical growth with long face, anterior open bite, decreased posterior to anterior facial height ratio, increased lower facial height and increased SN-MP angle (Schendel et al, 1976).
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