Which plane is defined as the plane established by a line connecting the buccal cusp tips and incisal edges of the mandibular teeth?

Which plane is defined as the plane established by a line connecting the buccal cusp tips and incisal edges of the mandibular teeth?

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

Answer: (A)

The plane of occlusion is the reference plane for how the teeth contact during chewing and is defined by a line that runs through the buccal cusp tips of the posterior teeth and the incisal edges of the mandibular incisors. This line provides a stable, repeatable cue that the dentist uses to orient restorations and prosthetic setups so that the chewing surfaces meet evenly in centric occlusion and the anterior guidance is coordinated with posterior contacts. Using these landmarks keeps the occluding surfaces aligned with natural function, helps balance forces across the dentition, and supports both esthetic and functional outcomes. Other named lines aren’t the standard reference for defining the occlusal plane in this context, so the plane of occlusion is the best fit for this description.

The plane of occlusion is the reference plane for how the teeth contact during chewing and is defined by a line that runs through the buccal cusp tips of the posterior teeth and the incisal edges of the mandibular incisors. This line provides a stable, repeatable cue that the dentist uses to orient restorations and prosthetic setups so that the chewing surfaces meet evenly in centric occlusion and the anterior guidance is coordinated with posterior contacts. Using these landmarks keeps the occluding surfaces aligned with natural function, helps balance forces across the dentition, and supports both esthetic and functional outcomes. Other named lines aren’t the standard reference for defining the occlusal plane in this context, so the plane of occlusion is the best fit for this description.