In the mandibular posterior segment, the buccal cusps of mandibular premolars and molars represent the functioning surfaces and they are easy to visualizeintraorally. Therefore, these landmarks are used to establish the proper alignment in the posterior segments, within the patient’s acceptable archform. In the maxillary posterior segments, central grooves of the maxillary premolars and molars are used to access proper alignment. Again, these are used since they represent the functioning surfaces of the maxillary posterior teeth, and are easy to observe intraorally.
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