IADR Abstract Archives
Chin And Symphyseal Morphology In Individuals With Different Facial Types, A CT- Based Study.
Objectives: The chin is a unique feature of the modern human face. Previously, chin and symphyseal morphology was described as related to certain facial types, although this notion has never been evaluated in analytical approach. This study aimed to reveal the association between chin and symphyseal morphology and facial types, using head and neck CT scans.
Methods: The study was carried out on CT scans of the head and neck of 311 adult individuals, 163 males and 148 females, aged 18-95 years old, from the Department of Radiology, Carmel Medical Center, Israel. Facial typing was defined according to the following measurements: mandibular plane angle, facial height index and lower anterior facial height. All of the individuals were categorized into 3 groups according to their facial types: short-facial type (SFT), average-facial type (AFT) and long-facial type (LFT) (Figure). Chin and symphyseal assessment was performed according to previously described method by the authors.
Results: LFT and SFT comprised approximately 30% of the adult population. Facial type was found to be sex-dependent (p=0.019), LFT predominating the female population (63.3%), whereas SFT predominating the male population (65.2%). Chin thickness and area were significantly greater in SFT compared to the other groups (p<0.023), with no statistical difference between LFT and AFT (p>0.601). Symphyseal height was significantly greater in LFT (p<0.001) with no apparent difference between SFT and AFT (p=0.100). Chin width and symphyseal inclination differed significantly between all facial types (p<0.001).
Conclusions: This study is the first to seek for association between chin and symphyseal morphology and facial types. Chin width and symphyseal inclination were found to be important distinctive features of the facial types. The developmental and biomechanical aspects of the findings are discussed.
Methods: The study was carried out on CT scans of the head and neck of 311 adult individuals, 163 males and 148 females, aged 18-95 years old, from the Department of Radiology, Carmel Medical Center, Israel. Facial typing was defined according to the following measurements: mandibular plane angle, facial height index and lower anterior facial height. All of the individuals were categorized into 3 groups according to their facial types: short-facial type (SFT), average-facial type (AFT) and long-facial type (LFT) (Figure). Chin and symphyseal assessment was performed according to previously described method by the authors.
Results: LFT and SFT comprised approximately 30% of the adult population. Facial type was found to be sex-dependent (p=0.019), LFT predominating the female population (63.3%), whereas SFT predominating the male population (65.2%). Chin thickness and area were significantly greater in SFT compared to the other groups (p<0.023), with no statistical difference between LFT and AFT (p>0.601). Symphyseal height was significantly greater in LFT (p<0.001) with no apparent difference between SFT and AFT (p=0.100). Chin width and symphyseal inclination differed significantly between all facial types (p<0.001).
Conclusions: This study is the first to seek for association between chin and symphyseal morphology and facial types. Chin width and symphyseal inclination were found to be important distinctive features of the facial types. The developmental and biomechanical aspects of the findings are discussed.
2813678_File000000.jpg