The 30-degree vertical angle of the condyle moving down the articular eminence is known as which concept?

The 30-degree vertical angle of the condyle moving down the articular eminence is known as which concept?

• A. Bennet angle
• B. Horizontal condylar inclination (HCI) angle
• C. Canine guidance
• D. Incisal guidance

Answer: (B)

The movement of the condyle as it travels down the articular eminence in the sagittal (side) view is described by the horizontal condylar inclination angle. This angle measures how steeply the condyle descends and moves forward along the eminence, typically around 30 degrees. It differs from the Bennet angle, which refers to the sideways (lateral) shift of the nonworking condyle in the horizontal plane during a lateral jaw movement, and from canine or incisal guidance, which describe anterior contacts guiding eccentric movements rather than the vertical path of the condyle itself. So the 30-degree downward path along the eminence corresponds to the horizontal condylar inclination angle.

The movement of the condyle as it travels down the articular eminence in the sagittal (side) view is described by the horizontal condylar inclination angle. This angle measures how steeply the condyle descends and moves forward along the eminence, typically around 30 degrees. It differs from the Bennet angle, which refers to the sideways (lateral) shift of the nonworking condyle in the horizontal plane during a lateral jaw movement, and from canine or incisal guidance, which describe anterior contacts guiding eccentric movements rather than the vertical path of the condyle itself. So the 30-degree downward path along the eminence corresponds to the horizontal condylar inclination angle.