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4-The triangular ridge of the mesiobuccal<br />
cusp of the maxillary first molar occludes in<br />
the mesiobuccal groove of the mandibular<br />
first molar. Class I molars and<br />
Canines occlude in class I, mesial slope of<br />
the upper canine cusp occludes with the<br />
distal slope of the lower canine.
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