The document discusses mutually protected occlusion, where the posterior teeth bear vertical occlusal forces during centric occlusion while the anterior teeth experience light contact. It describes how anterior movements of the mandible guide the motion and protect the posterior teeth from destructive horizontal forces. Additionally, during lateral movements, upper and lower canines on the working side contact each other, further protecting both anterior and posterior teeth from lateral forces.

1. Anterior guidance

2. Incisal guidance
:

5. Mutually protected occlusion
• During the centric occlusion (with maximum
intercuspation) the vertical occlusal forces
will be directed to the posterior teeth with
heavy contact, so that relieving forces from
anterior teeth (light contact)
• In this position the posterior teeth protecting
the anterior teeth

6. Mutually protected occlusion
• During anterior movements of the mandibule
the palatal surfaces of the anterior teeth will
guide the mandibular movements foreword
and downward so that disclosing the posterior
teeth
• Thus the anterior teeth are protecting the
posterior teeth from horizontal forces which
are more destructive to posterior teeth

7. Mutually protected occlusion
• During the lateral movements of the mandibul
the upper and lower canines on the working
side only will contact each other, dis closing
the anterior and posterior teeth
• Hence protecting these teeth from lateral
forces

8. Thank you