<prompt> In the cast restoration, cusp protection is mandatory when:The lesion depth is 13 to 12 the intercuspal distanceThe lesion depth exceeds 12 the intercuspal distanceThe lesion width is 13 to 12 the intercuspal distanceThe lesion width exceeds 12 the intercuspal distance  <response>: Indications:If the width of the lesion is 13 to 12 the intercuspal distance - cuspal protection is to be considered.If the width of the lesion exceeds 12 the intercuspal distance - cuspal protection is mandatory.If the length:width of the cusp is more than 1:1, but not exceeding 2:1 - cuspal protection is to be considered.If the length:width of the cusp is more than 2:1 - cuspal protection is mandatory.When there is a need to change the dimension, shape and interrelationship of the occluding tooth surfaces.MDS Prep Bytes Cast Restoration Onlay 