Lip changes after premolar extraction in Class I bimaxillary protrusion: A retrospective study in Thai female adults

Conclusion The ratios of upper and lower anterior teeth retraction and upper and lower lip changes were 1:0.56 and 1:0.87, respectively. The predictive equations of upper and lower lip reductions were ΔH-U-lip=0.34(ΔH-tUI)+1.19 and ΔH-L-lip=0.57(ΔH-cLI)+2.11, respectively.

Source: Orthodontic Waves - November 28, 2017 Category: Dentistry Source Type: research