The imaginary line through all the lingual cusp tips on the maxillary posterior teeth is known as which line?

The imaginary line through all the lingual cusp tips on the maxillary posterior teeth is known as which line?

• A. Plane of occlusion
• B. BO line
• C. LO line
• D. CF line

Answer: (C)

The line through the lingual cusp tips of the maxillary posterior teeth is the lingual-occlusal line. This imaginary line runs along the tongue-facing cusps and provides a reference for how the posterior teeth align on the lingual side, helping to understand occlusal relationships and guidance for occlusal setups. It differs from the plane of occlusion, which is a three-dimensional reference plane rather than a single line, and from a buccal-occlusal line, which would pass along the buccal cusp tips. The CF line isn’t a standard term in this context. So the lingual-occlusal line is the correct choice.

The line through the lingual cusp tips of the maxillary posterior teeth is the lingual-occlusal line. This imaginary line runs along the tongue-facing cusps and provides a reference for how the posterior teeth align on the lingual side, helping to understand occlusal relationships and guidance for occlusal setups. It differs from the plane of occlusion, which is a three-dimensional reference plane rather than a single line, and from a buccal-occlusal line, which would pass along the buccal cusp tips. The CF line isn’t a standard term in this context. So the lingual-occlusal line is the correct choice.