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During a working side movement (right or left) of the mandible:
the mesiobuccal cusp of the maxillary first molar passes through the lingual groove of the mandibular first molar, and
the mesiobuccal cusp of the maxillary second molar passes through the facial groove of the mandibulat second molar
why first molar passes through the lingual groove while the second molar passes through the facial groove? I am so confused, can somebody explain it for me. Thanks a lot.
the mesiobuccal cusp of the maxillary first molar passes through the lingual groove of the mandibular first molar, and
the mesiobuccal cusp of the maxillary second molar passes through the facial groove of the mandibulat second molar
why first molar passes through the lingual groove while the second molar passes through the facial groove? I am so confused, can somebody explain it for me. Thanks a lot.