Evaluation of Soft Tissue Measurements in Skeletal Class II Division I Malocclusion with Low Mandibular Plane Angel in Himachali Population: A Lateral Cephalometric Study

Aim: To evaluate the soft tissue characteristics of skeletal Class II Division 1 subjects (group II) with low mandibular plane angel compared with skeletal Class I subjects (group I) in himachali population.Material and Methods: Lateral cephalograms of 100 adults (60 women, 40 men; age range 18-50yrs) were divided into 2 groups based on horizontal and vertical skeletal pattern (SN-MP angle): group I, 50 subjects; group II-low angle (<27°), 50 subjects.The correlations and multiple linear regression tests were used to determine the skeletal and dental variables influencing soft tissue characteristics.Results: For the soft tissue analysis of all subjects, lower lip thickness was significantly increased in group II-L compared with group I.The perioral soft tissue measurements of group II were correlated with the inclination and anteroposterior position of the maxillary and mandibular incisors along with facial depth (N-Go) and facial length (S-Gn).Upper lip strain of group II was influenced by the inclination and anteroposterior position of the maxillary incisors.Conclusions: It is important to evaluate lip strain and lip thickness based on the skeletal pattern as well as dental inclination to obtain balance in the perioral muscle activity.

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