Name two common occlusal schemes in natural dentition and one key feature of each.

• A. Canine guidance—allows posterior teeth to contact during lateral movement; Group function—only a single posterior tooth bears contact.
• B. Group function—discludes posterior teeth during lateral movement; Canine guidance—no posterior contacts on working side.
• C. Canine guidance—discludes posterior teeth during lateral movement; Group function—multiple posterior teeth share contacts on the working side.
• D. Anterior guidance—discludes posterior teeth during lateral movement; Group function—multiple posterior teeth share contacts on the working side.

Answer: (C)

Two common occlusal schemes in natural dentition are canine guidance and group function. Canine guidance means that during lateral jaw movement the canines contact and guide the bite, causing the posterior teeth to disengage and not contact. This protects the back teeth from lateral forces. Group function means that on the working side, several posterior teeth share contacts during lateral movement, distributing the load across multiple teeth rather than relying on a single tooth.

So the best description is that canine guidance discludes posterior teeth during lateral movement, while group function involves multiple posterior teeth sharing contacts on the working side.