IADR Abstract Archives
Factors Associated with Lip Incompetency in Skeletal Class II Malocclusion – A Cross-sectional Study
Objectives: In orthodontics, patients with class II malocclusion usually present with soft tissue incompetency. This study aimed to identify the cephalometric variables that are associated with lip incompetency in skeletal class II malocclusion patients.
Methods: A cross-sectional study was conducted on a sample of 40 skeletal class II subjects, aged 18-35 years. The pre-treatment frontal and lateral facial photographs along with the standardized lateral cephalometric radiographs were used. The subjects were categorized into competent and incompetent lip groups based on the facial photographs. Cephalometric variables were measured to evaluate the factors which may predict the increased risk of lip incompetency in skeletal class II patients. An independent t-test was used for the comparison of cephalometric variables between competent and incompetent lip. Cox regression analysis was applied to predict variables associated with lip incompetency.
Results: Statistically significant values for upper lip prominence (p < 0.018) and strain (p < 0.031), overjet (p < 0.003), Upper sulcus depth (p < 0.047), E- line to lower lip (p < 0.048), S-line to upper lip (p < 0.026) were observed.
Conclusions: Subjects with incompetent lips exhibited a retruded mandible, hyperdivergent and convex profiles with protruded dentoalveolar pattern compared to those with competent lips. Upper lip prominence and strain, overjet, upper sulcus depth, E- line to the lower lip, S-line to upper lip were found to be associated with lip incompetency in adult class II subjects
Methods: A cross-sectional study was conducted on a sample of 40 skeletal class II subjects, aged 18-35 years. The pre-treatment frontal and lateral facial photographs along with the standardized lateral cephalometric radiographs were used. The subjects were categorized into competent and incompetent lip groups based on the facial photographs. Cephalometric variables were measured to evaluate the factors which may predict the increased risk of lip incompetency in skeletal class II patients. An independent t-test was used for the comparison of cephalometric variables between competent and incompetent lip. Cox regression analysis was applied to predict variables associated with lip incompetency.
Results: Statistically significant values for upper lip prominence (p < 0.018) and strain (p < 0.031), overjet (p < 0.003), Upper sulcus depth (p < 0.047), E- line to lower lip (p < 0.048), S-line to upper lip (p < 0.026) were observed.
Conclusions: Subjects with incompetent lips exhibited a retruded mandible, hyperdivergent and convex profiles with protruded dentoalveolar pattern compared to those with competent lips. Upper lip prominence and strain, overjet, upper sulcus depth, E- line to the lower lip, S-line to upper lip were found to be associated with lip incompetency in adult class II subjects