As discussed today, Occlusal schemes are the manner in which we would set posterior teeth for a Class I, II and III jaw relationship. What does this mean for you, the dental technology student,
When we set posterior teeth in a Class I jaw relationship the mandibular buccal cusps of the posterior teeth are set to occlude into the central fossa of the maxillary posterior teeth. In relation to the anterior teeth, you will find that there is a minimal amount of overbite and overjet.
When we set posterior teeth in a Class II jaw relationship (the mandible is smaller than the maxilla), which results in a larger overbite and overjet. We also find that the madibular first premolar makes less contact with the maxillary posterior teeth. Which means that the mandibular arch curves lingually earnier than the maxillary arch.
When we set posterior teeth in a Class III jaw relationship, the mandibular jaw is protruded in relation to the maxillary jaw. The anterior teeth are in an edge to edge relationship. We also find that the mandibular posterior ridges are more buccal in relation to the maxillary posterior ridges. With the mandible being larger than the maxilla the technician usually needs to set posterio teeth in a unilateral or bilateral cross bite relationship.
In essence the teeth are set in the same relationship.
Occlusal concepts are what was created in order to create retention and stability for an edentulous case, when the poterior teeth are set. These are:
Balanced occlusion
Lingualised occlusion
Monplane occlusion
Please feel free to add comments.
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