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2. The mentalis action: an essential component of chin and lower lip position;Zide;Plast Reconstr Surg,2000
3. The influence of maximum perioral and tongue force on the incisor teeth;Posen;Angle Orthod,1972
4. The application of quantitative perioral assessment to orthodontic case analysis and treatment planning;Posen;Angle Orthod,1976
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