OPTION 4

Anterior Guidance:

•            During protrusive movement of the mandible, the incisal edges of mandibular anterior teeth move forward and downward along the lingual concavities of the maxillary anterior teeth.

•            The track of the incisal edges from maximum intercuspation to edge-to-edge occlusion is termed the protrusive incisal path.

•            The angle formed by the protrusive incisal path and the horizontal reference plane is the protrusive incisal path inclination, which ranges from 50 to 70 degrees.

•            The lingual surface of a maxillary anterior tooth has both a concave aspect and a convexity, or cingulum. The mandibular incisal edges should contact the maxillary lingual surfaces at the transition from the concavity to the convexity in the centric relation position.

•            Therefore, reshaping of upper incisors or decreasing incisal edges of mandibular anteriors will change the anterior guidance.

•            Anterior guidance, which is linked to the combination of vertical and horizontal overlap of the anterior teeth, can affect occlusal surface morphology of the posterior teeth.

•            The greater the vertical overlap of the anterior teeth, the longer the posterior cusp height may be. When the vertical overlap is less, the posterior cusp height must be shorter.

•            Condylar guidance for a patient can’t be modified.

Key Concept

CONDYLAR GUIDANCE

•            It is the mandibular guidance generated by condyle and articular disc traversing the contour of glenoid fossa. It cannot be modified by the clinician.

Factors:-

•            Bony contour of the TMJ

•            Actions of the muscles

•            The limitations of the movement by ligaments.