This is because when labioincisal edges are aligned properly, the teeth look the best esthetically and they are the functioning surfaces of the mandibular anterior teeth. In the maxillary anterior segment, the lingual surfaces of the maxillary incisors and canines are used as a guideline to establish proper alignment. This is based on the fact that, these surfaces are the functioning surfaces and when aligned properly, the anteriors appear to be in their best esthetic relationship.
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