Abstract

Objective To investigate the dentofacial morphology in skeletal Class Ⅰ adolescents with gummy smile.Methods Ninety-seven skeletal Class Ⅰ adolescents with gummy smile were selected and 100 skeletal Class Ⅰ adolescents without gummy smile served as controls.Lateral cephalometric radiographs were taken in the natural head position (NHP). Computerized cephalometrics and statistic analyses were performed.Results The U1-PP values in male and female adolescents with Class Ⅰ skeletal pattern and gummy smile were 28.93±0.92 and 27.35±1.47,respectively.Significant differences were found in U1-PP between experimental and control groups.Furthermore,in male adolescents,SN-MP,SN-OP,S-Go,N-Me,SN-PP and FCA showed significant differences between gummy smile group and control group.Conclusions The mechanism of gummy smile was complicated and abnormalities in dentofacial complex were found. Key words: Class Ⅰ skeletal pattern; Gummy smile; Dentofacial; Cephalometric

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