The horizontal reference for orientating the incisal plane and the maxillary teeth is:
  1. Smile analysis
  2. Interpupillary line
  3. Gingival framework
  4. Dental analysis
Explanation
Answer: B - The horizontal reference for orientating the incisal plane and the maxillary teeth is the interpupillary line. The interpupillary line aids in symmetry to ensure balanced esthetics during corrective dentistry.
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