Maxillary second bicuspid – a key to occlusionRicketts 14 pointed out that the contact position of the maxillary second premolar is a key to a properly treated malocclusion. The maxillary second premolar should have a normal contact relation with the mesial incline of the lower first molar which produces an interlocking into the corresponding interspaces of the lower premolars (Fig. 7). This relationship causes the tip of the mesiobuccal cusp of the upper first molar to be slightly distal to the mesiobuccal grove of the lower first molar.According to Ricketts this is the most efficient, most self-cleansing and most self-preserving relationship in accordance with Nature’s plan.
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