Fig. 11From: Biomechanical analysis of effective mandibular en-masse retraction using Class II elastics with a clear aligner: a finite element studyElastics localization was located on the buccal side of the center of resistance of the lower first molar (a, b) which would aggravate the mesial tipping (c), lingual tipping and mesiolingual rotation (d) of the posterior teethBack to article page